Patent Grant
11873535
The present disclosure relates to authentication of processed botanical materials, such as powders and extracts in dietary supplements. In particular, the present disclosure relates to methods and kits for assessing botanical DNA fragments in dietary supplements.
DNA-based methods have gained recognition as a tool for botanical authentication in herbal medicine; however, the low quality of DNA both in terms of DNA size and also DNA quantity in botanical extracts limit the effectiveness of these methods.
Industrial processing of botanicals for use in herbal medicines or in dietary supplements leads to the damage of the DNA. The size of DNA in dried botanical tissue decreases from around 600 base pairs (bp) or greater to less than 200 bp. This makes botanical DNA undetectable in processed botanicals (e.g., in botanical extracts or sterilized powders) with current DNA detection methods, such as traditional DNA barcoding.
Botanical dietary supplements are prepared using plants or plant parts for their medicinal or therapeutic properties and flavor or scent. With consumers' increasing awareness of the link between a healthy diet and its potential health benefits, the botanical dietary supplements market is growing rapidly. According to a report published by Persistence Market Research, the global botanical supplement market is projected to reach a valuation of US $37,950 million by the end of 2017. In terms of revenue, the market is set to witness a Compound Annual Growth Rate (CAGR) of 6.9% during the forecast period (Research, P. M. Global Market Study on Botanical Supplements: Drugs Application Segment to Hold Maximum Value Share During 2017-2025; 2017, incorporated by reference herein in its entirety).
With the growth of global botanical dietary supplement consumption also comes the increased incidence of substitution or adulteration of herbal products with lower-cost species. Botanical substitution or adulteration may lead to less healthy benefits or even unexpected health risks. To maximize health benefits and customer safety, it is necessary to correctly identify the target botanical and detect adulterants. Multiple methods for botanical identification have been proposed in many pharmacopoeias and are currently being used in the quality control process of dietary supplements manufacture. These methods include morphological (macroscopic and microscopic) and chemical methods. However, these methods are challenged by the loss of physical features in the processed product and variation of botanical chemical profile due to seasonal and geographical differences. In addition, both types of methods have a limited ability to detect adulterants in practice, especially in the setting of global trading.
It is therefore an aspect of this disclosure to provide methods and kits for analyzing DNA fragments in processed botanical samples, such as in herbal medicine, dietary supplements, botanical extracts, or processed botanical powders. Specifically, provided herein are methods and kits that use adapter-ligation and amplification of the adapter-ligated DNA to confirm the existence of amplifiable botanical DNA and develop assays for authentication of the target botanical DNA.
Some embodiments provided herein relate to a method of authenticating processed botanical material. In one embodiment, the method includes isolating genomic DNA from a sample, ligating adapters to the botanical DNA fragments to generate adapter-ligated DNA fragments, amplifying the adapter-ligated DNA fragments to detect the botanical DNA fragments and to determine a size range of the botanical DNA fragments, hybridizing PCR-based primers to a target nucleic acid sequence in the botanical DNA fragments, and amplifying the target nucleic acid sequence. In some embodiments, the genomic DNA isolated from the sample includes botanical DNA fragments. In some embodiments, detecting the botanical DNA fragments includes running the amplified adapter-ligated DNA fragments on a gel for separation of the botanical DNA fragments so that the fragments may be visualized.
In one embodiment, the method includes isolating genomic DNA from a sample, ligating adapters to the botanical DNA fragments to generate adapter-ligated DNA fragments, amplifying the adapter-ligated DNA fragments to detect the botanical DNA fragments and to determine a size range of the botanical DNA fragments, designing PCR-based primers according to the size range of the botanical DNA fragments, hybridizing the PCR-based primers to a target nucleic acid sequence in the botanical DNA fragments, and amplifying the target nucleic acid sequence. In some embodiments, the PCR-based primers are designed on the basis of target species consensus sequence as PCR template and non-target consensus sequences as exclusion sequences. In some embodiments, designing includes selecting from a library. In some embodiments, the genomic DNA isolated from the sample includes botanical DNA fragments. In some embodiments, detecting the botanical DNA fragments includes running the amplified adapter-ligated DNA fragments on a gel for separation of the botanical DNA fragments so that the fragments may be visualized.
In some embodiments, the method further includes sequencing the target nucleic acid sequence to authenticate a botanical species present in the sample. In some embodiments, the method further includes detecting botanical adulteration in the sample. In some embodiments, the sample is a processed botanical sample. In some embodiments, the processed botanical sample is a dietary supplement, a botanical extract, or a powder. In some embodiments, the processed botanical sample is sterilized. In some embodiments, the botanical DNA fragments are less than 220 base pairs. In some embodiments, the botanical DNA fragments are present in an amount of 1 pg to 1 ng. In some embodiments, amplifying is performed by polymerase chain reaction (PCR). In some embodiments, the botanical is chamomile (including Matricaria chamomilla (also referred to as German chamomile or Matricaria recutita), feverfew (Tanacetum parthenium), Roman chamomile (Chamaemelum nobile syn anthemis nobilis), Chinese chamomile (Chrysanthemum x morifolium, or Chrysanthemum indicum), guarana (Paullinia cupana), parsley (Petroselinum crispum), celery (Apium graveolens), fennel (Foeniculum vulgare), Asian ginseng (Panax ginseng), American ginseng (Panax quinquefolius), Tienchi ginseng (Panax notoginseng), Siberian ginseng (Eleutherococcus senticosus) Dong Quai (Angelica sinensis), garden angelica (Angelica archangelica), pubescent Angelica (Angelica pubescens)), dahurian angelica (Angelica dahurica), Chinese cinnamon (Cinnamomum cassia), true cinnamon (Cinnamomum verum syn Cinnamomum zeylanicum), Indonesian cinnamon (Cinnamomum burmannii), Ginkgo (Ginkgo biloba), Japanese sophora (Sophora japonica), buckwheat (Fagopyrum esculentum), jujube (Ziziphus spinosa), Indian jujube (Ziziphus mauritiana), Japanese raisin tree (Hovenia dulcis), ginger (Zingiber officinale), lesser galangal (Alpinia officinarum), greater galangal (Alpinia galanga), schisandra (Schisandra chinensis), southern schisandra (Schisandra sphenanthera), astragalus (Astragalus membranaceus), maca (Lepidium meyenii), radish (Raphanus sativus), turnip (Brassica rapa), peppermint (Mentha piperita), Chinese mint (Mentha canadensis), green tea (Camellia sinensis), rosemary (Rosmarinus officinalis), bilberry (Vaccinium myrtillus), blueberry (Vaccinium corymbosum), cranberry (Vaccinium macrocarpon), mulberry (Morus alba), or guarana (Paullinia cupana).
In some embodiments, the PCR-based primers are a species-specific primer set. In some embodiments, the species-specific primer set includes a first primer including a nucleic acid sequence as defined in SEQ ID NO: 1 and a second primer including a nucleic acid sequence as defined in SEQ ID NO: 2. In some embodiments, the species-specific primer set includes a primer including a nucleic acid sequence as defined in SEQ ID NO: 3 and a primer including a nucleic acid sequence as defined in SEQ ID NO: 4. In some embodiments, the species-specific primer set includes a primer including a nucleic acid sequence as defined in SEQ ID NO: 5 and a primer including a nucleic acid sequence as defined in SEQ ID NO: 6. In some embodiments, the species-specific primer set includes a primer including a nucleic acid sequence as defined in SEQ ID NO: 7 and a primer including a nucleic acid sequence as defined in SEQ ID NO: 8.
Some embodiments provided herein relate to a method for authenticating chamomile in supplement. In some embodiments, the method includes obtaining a dietary supplement including a plant extract. In some embodiments, the method further includes isolating genomic DNA from the dietary supplement. In some embodiments, the genomic DNA includes chamomile DNA fragments. In some embodiments, the method further includes hybridizing a species-specific primer to a target nucleic acid sequence in or suspected of being in the dietary supplement. In some embodiments, the method further includes amplifying the chamomile DNA. In some embodiments, the method further includes authenticating the chamomile DNA by determining the presence and quantity of target nucleic acid sequence.
In some embodiments, the dietary supplement includes a sterilized botanical powder. In some embodiments, the chamomile DNA fragments are present in the supplement in an amount of about 1 pg to about 1 ng. In some embodiments, the chamomile DNA fragments are less than about 220 base pairs. In some embodiments, the chamomile DNA includes DNA from Matricaria chamomilla, Tanacetum parthenium (feverfew), Chamaemelum nobile (Anthemis nobilis or Roman chamomile), Chrysanthemum x morifolium, or Chrysanthemum indicum (Chinese chamomile). In some embodiments, the species-specific primer set includes a primer including a nucleic acid sequence as defined in SEQ ID NO: 1 and a primer including a nucleic acid sequence as defined in SEQ ID NO: 2. In some embodiments, the species-specific primer set includes a primer including a nucleic acid sequence as defined in SEQ ID NO: 3 and a primer including a nucleic acid sequence as defined in SEQ ID NO: 4. In some embodiments, the species-specific primer set includes a primer including a nucleic acid sequence as defined in SEQ ID NO: 5 and a primer including a nucleic acid sequence as defined in SEQ ID NO: 6. In some embodiments, the species-specific primer set includes a primer including a nucleic acid sequence as defined in SEQ ID NO: 7 and a primer including a nucleic acid sequence as defined in SEQ ID NO: 8.
Some embodiments provided herein relate to a method of detecting botanical DNA fragments from a dietary supplement. In some embodiments, the method includes obtaining a dietary supplement including processed botanical extracts. In some embodiments, the method further includes isolating botanical DNA fragments from the supplement. In some embodiments, the method further includes ligating adapters with a known DNA sequence to the botanical DNA fragments to generate adapter-ligated DNA. In some embodiments, the method further includes amplifying the adapter-ligated DNA; and evaluating total DNA after amplification. In some embodiments, evaluating total DNA after amplification includes determining the size of DNA fragments, determining the sequence of the DNA, determining the quantity or quality of DNA, or otherwise analyzing DNA. In some embodiments, the dietary supplement includes a processed botanical extract or powder. In some embodiments, ligating is performed at 4° C. overnight. In some embodiments, amplifying is performed by PCR.
Some embodiments provided herein relate to a kit for botanical authentication of a sample. In some embodiments, the kit including isolation reagent for isolating fragmented botanical DNA from a processed botanical sample, ligation-adapters for ligating adaptors to the fragmented botanical DNA to generate adapter-ligated DNA, a species-specific primer set for hybridizing to a target nucleic acid sequence, and amplification reagents for amplification of a target nucleic acid sequence. In some embodiments, the kit is capable of amplifying fragmented botanical DNA having less than about 220 base pairs, and present in the processed botanical sample in an amount of about 1 pg to about 1 ng. In some embodiments, the kit further includes a user's guide including instructions for executing a method of authenticating a botanical sample.
Some embodiments provided herein related to a method of authenticating botanical material. In some embodiments, the method includes isolating genomic DNA from a sample, amplifying and sequencing the genomic DNA, comparing sequencing reads to obtain a plurality of contigs, aligning the plurality of contigs based on a coding region, aligning the plurality of contigs based on a non-coding region, and authenticating a botanical material when a sequence aligns with at least 97% similarity. In some embodiments, the genomic DNA isolated from the sample includes botanical DNA fragments. In some embodiments, the method further includes detecting the botanical DNA fragments by running the amplified DNA on a gel.
In some embodiments, the sample is a root, leaf, fruit, flower, bark, and/or seed. In some embodiments, the botanical material is ginseng (including Asian ginseng (Panax ginseng), American ginseng (Panax quinquefolius), Tienchi ginseng (Panax notoginseng), Dong Quai (Angelica sinensis), Garden Angelica (Angelica archangelica), or Pubescent Angelica (Angelica pubescens)), peppermint (Mentha piperita), Chinese mint (Mentha canadensis), green tea (Camellia sinensis), rosemary (Rosmarinus officinalis), Schisandra (Schisandra chinensis), Southern Schisandra (Schisandra sphenanthera), bilberry (Vaccinium myrtillus), blueberry (Vaccinium corymbosum), cranberry (Vaccinium macrocarpon), chamomile (including German chamomile (Matricaria recutita), Roman chamomile (Chamaemelum nobile), feverfew (Tanacetum parthenium), or Chinese chamomile (Chrysanthemum indicum)), Chinese cinnamon (Cinnamomum cassia), cinnamon (Cinnamomum zeylanicum), mulberry (Morus alba), jujube (Ziziphus spinosa), Indian jujube (Ziziphus mauritiana), or guarana (Paullinia cupana). In some embodiments, the coding region includes rbcL and matK coding regions. In some embodiments, the non-coding region includes ITS2, trnL-trnF, and psbA-trnH non-coding regions.
In the following detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, similar symbols typically identify similar components, unless context dictates otherwise. The illustrative embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented herein. It will be readily understood that the aspects of the present disclosure, as generally described herein, and illustrated in the Figures, can be arranged, substituted, combined, separated, and designed in a wide variety of different configurations, all of which are explicitly contemplated herein.
Recently, DNA-based molecular analysis techniques, such as randomly amplified polymorphic DNA (RAPD), PCR-restriction fragment length polymorphism (PCR-RFLP) analyses, hybridization, microarrays, and DNA barcoding have been introduced to botanical authentication to complement the traditional physical and chemical identification methods (Heubl, G. (2010). Planta Med, 76(17), 1963-1974, incorporated by reference herein in its entirety).
Like the black and white barcode lines found on the packages of almost all commercial products, each botanical species has specific DNA sequences called DNA barcodes, which can be used for botanical identification.
Traditional botanical identification methods include morphological and chemical methods. However, these methods are challenged by the loss of physical features in the processed product and variation in botanical chemical profiles due to seasonal and geographical differences. DNA barcodes provide a relative stable profile for identification purposes. A single barcode for botanical identification is yet to be found. Using multiple DNA barcodes together will increase their discrimination power. However, 3 or more barcodes do not provide additional discrimination power than 2 barcodes if the appropriate combination is chosen (C. P. W. Group. PNAS 106(31), (2009), pp. 12794-12797; incorporated herein by reference in its entirety). Two-tiered DNA barcoding has been applied to botanical identification in research, but industry regulations require a validated method and a defined scope (Newmaster et al. BMC medicine 11.1 (2013), p. 222; Pawar et al. Planta Medica 82.05 (2016), OA17; each of which is incorporated herein by reference in its entirety).
The application of DNA-based methods in processed botanical materials, however, is challenging. For example, DNA barcoding methodologies have been tested in botanical dietary supplements; however, these studies show that DNA barcoding was not able to identify target botanical DNA in many of the tested finished products, especially botanical extracts. The quantity and quality of DNA is the key to any sensitive, reliable, and reproducible DNA-based molecular analysis; however, there are two major challenges for isolating genomic DNA from botanical materials with sufficient quantity and quality. First, secondary metabolites, such as polyphenols, terpenoids and alkaloids, are often present in the final DNA elution and act as inhibitors for PCR amplification. These compounds are usually found in higher quantities in extracts because they are enriched or included in the supplement to provide a therapeutic benefit (Demeke et al. (1992). Biotechniques, 12(3), 332-334, incorporated herein by reference in its entirety). Second, DNA degradation. DNA in botanical dietary supplements is either heavily degraded or completely eliminated due to the isolation process, which can include heat treatment, irradiation, filtration, or UV exposure (Cimino, M. T. (2010). Planta Med, 76(5), 495-497, incorporated by reference herein in its entirety). Due to these challenges, as well as limited quantities of DNA in the processed botanicals and detection limits of agarose gel, degraded genomic DNA is undetectable with current methods. In addition, the study of DNA degradation in botanical materials is further complicated by the involvement of botanically derived excipients that may also contain their own DNA. Because of these detection obstacles, the presence of amplifiable target DNA in extracts remains challenging.
To ensure product safety and therapeutic efficacy, botanical dietary supplements, especially those containing botanical extracts, undergo extensive manufacturing processes. These processes include grinding, solvent extraction, heat treatment, drying, and filtration, which aim to enrich bioactive chemical ingredients, but often remove plant tissues that contain DNA (Gryson, N. (2010). Anal Bioanal Chem, 396(6), 2003-2022; Parveen et al. (2016). Planta Medica, 82(14), 1225-1235, each of which is incorporated by reference herein in its entirety). The DNA in these supplements is low in quantity and quality, if present at all. In addition to low quantity and quality of DNA, third party evaluation of DNA in botanical dietary supplements is further complicated by the addition of botanical derived excipients later in the manufacturing process (Calixto, J. (2000). Brazilian Journal of Medical and Biological Research, 33(2), 179-189, incorporated by reference herein in its entirety). Because these excipients go through lighter manufacturing processes and therefore frequently contain DNA of better quality and quantity than the DNA from the botanical on the label claim, many DNA-based botanical authentication methods identify the excipients rather than the target botanicals (Ivanova et al. (2016). PLoS One, 11(5), e0156426; Little, D. P. (2014). Genome, 57(9), 513-516; Newmaster, et al. (2013). BMC Med, 11, 222; Pawar et al. Planta Med(EFirst), each of which is incorporated by reference herein in its entirety).
It is believed that DNA in processed food is fragmented into lengths of around 100 to 200 base pairs (Parveen, et al. (2016). Planta Medica 82, 1225-1235, incorporated by reference herein in its entirety). The presence of the degraded DNA has only been detected in DNA isolated from processed botanical tissues and crude plant oils that are made under low-oxidation environments (Bauer et al. (2004). Environmental biosafety research, 3(4), 215-223; Busconi et al. (2003). Food chemistry, 83(1), 127-134; Gryson et al. (2002). Journal of the American Oil Chemists' Society, 79(2), 171-174; Hellebrand et al. (1998). Zeitschrift für Lebensmitteluntersuchung und-Forschung A, 206(4), 237-242; Kakihara et al. (2007). Food Control, 18(10), 1289-1294; Murray et al. (2009). Journal of the Science of Food and Agriculture, 89(7), 1137-1144; Pauli et al. (2000). Mitteilungen aus Lebensmitteluntersuchung und Hygiene, 91(5), 491-501, each of which is incorporated by reference herein in its entirety); however DNA from botanical extracts has not yet been detected and reported. Recently, PCR and real-time PCR methods have been proposed to assess and quantify DNA fragmentation in processed foods (Guan et al. (2013). Applied Biochemistry and Biotechnology, 169(2), 368-379, incorporated by reference herein in its entirety). However, these indirect methods only evaluated DNA at discontinuous fragment length and the resolution of these methods is limited to the expected size range of the DNA in real botanical products.
High temperature, low pH, fermentation, mechanical force, enzymatic degradation, and irradiation are common manufacturing factors that have been studied extensively in regards to DNA degradation in food products (Gryson, N. (2010). Anal Bioanal Chem, 396(6), 2003-2022, incorporated by reference herein in its entirety). For the isolation of DNA from botanical extracts, the use of solvents and the filtration process are two additional factors for consideration. It is possible that DNA may not be isolated in sufficient amounts with certain solvents or may be eliminated by further refinement processes, such as filtration (Sarma, N. (2015). DNA Testing of Herbal Supplements—Does it Work or Doesn't It?, incorporated by reference herein in its entirety).
Botanicals could be mistakenly identified and purchased due to similarity in morphology or shared words in their common names. For example, several cultivated botanicals exist that appear similar or include the word “chamomile” in their common names. Special attention has to be paid to avoid confusion with the following botanical species, including Tanacetum parthenium, commonly known as feverfew; Chamaemelum nobile (synonym: Anthemis nobilis), commonly known as Roman chamomile; Chrysanthemum x morifolium, and Chrysanthemum indicum, commonly known as Chinese chamomile.
German chamomile can be authenticated by morphological features if an intact plant or plant parts are presented. However, due to global herbal trade, most German chamomile products are sold in the form of powder and extract, which are not suitable for macroscopic examination. Numerous chemical-based chamomile authentication methods, which were designed to confirm and quantify bioactive compounds such as polyphenols, flavonoids, flavonoid glycosides, and coumarins, have been developed using UHPLC-UV-MS, GS-MS, HPTLC (Avula, et al. (2014). J Pharm Biomed Anal, 88, 278-288; Sagi, et al. (2014). J Sep Sci, 37(19), 2797-2804; Wang, et al. (2014). Food Chem, 152, 391-398, each of which is incorporated by reference herein in its entirety). However, these chemical methods have limitations: 1) The chemometrics of chamomile flower heads can be affected by seasonal variation, geographical location, and manufacturing process. 2) The interpretation of the chromatographic footprint requires experienced chemists, expensive instruments, sometimes computational modeling, and the process is often subjective. 3) Expensive and high quality chemical reference standards are required. Due to variations of chemical profile and no-standardized data interpretation, adulteration or similar botanical species contamination is often difficult to be detected by established chemical methods.
A species-level DNA-based authentication method has been explored for chamomile extract. However, it only tested one chamomile extract and did not consider common chamomile adulterants described herein (Novak, et al. (2007). Food Res International, 40(3), 388-392, incorporated herein by reference in its entirety).
In some embodiments of the methods and kits provided herein, a size distribution of DNA fragments in dietary supplements is detected. Some embodiments relate to design of DNA detection methods for authentication of target botanical species within a botanical material and for identification of common adulterants that may also be present in a botanical material. Due to the decrease in sequence specificity with fragment length, multiple mini-barcode regions may need to be checked simultaneously to achieve maximum confidence in botanical authentication. Moreover, since excipients or adulterants bring in potential non-target DNA, special consideration needs to be taken to either differentiate or ignore non-target DNA signals when authenticating target botanicals in dietary supplements. To address the above challenges, species-specific DNA-based botanical authentication methods have to be developed. Small amplicon PCR, which targets species in a defined test scope but ignores others, and Next-Generation Sequencing (NGS), which generates massive short diagnostic sequence-reads at molecular resolution for both targeted and non-target DNA, are DNA technologies that may be suitable for the authentication of botanical dietary supplements.
Accordingly, described herein are methods and kits for determining the size distribution of DNA fragments in botanical dietary supplements, especially those containing botanical extracts. The DNA fragment size of processed botanical materials decreases with the level of processing of the dietary supplement. In some embodiments, the DNA fragment size in sterilized powders may be below about 1200 bp, 1100 bp, 1000 bp, 900 bp, 800 bp, 700 bp, 600 bp, 500 bp, 500 bp, 300 bp, 200 bp, or 100 bp. In some embodiments, the DNA isolated from botanical extracts may range be about 300 bp, 290 bp, 280 bp, 270 bp, 260 bp, 250 bp, 240 bp, 230 bp, 220 bp, 210 bp, 200 bp, 190 bp, 180 bp, 170 bp, 160 bp, 150 bp, 140 bp, 130 bp, 120 bp, 110 bp, 100 bp, 90 bp, 80 bp, 70 bp, 60 bp, 50 bp, 40 bp, 30 bp, 20, or 10 bp, or within a range defined by any two of the aforementioned values.
Some embodiments provided herein relate to a method of authenticating a botanical material. As used herein, the term “authenticate,” “authentication,” or “authenticating” or derivatives thereof refers to a process of verifying the identity of a botanical in the material. Authentication can include verifying the presence of a certain target botanical or verifying the absence of a certain target botanical, such as determining whether or not a certain botanical is present in the material. Authentication can include a determination of whether an adulterant is present in the material. As used herein, an “adulterant” refers to a substance or chemical that is present in a material as a substitute or contaminant.
In some embodiments, the botanical material may be a nutraceutical composition or a dietary supplement that includes a botanical matter, a processed botanical extract, or a botanical powder, including a sterilized botanical powder. As used herein an “extract” or “botanical extract” refers to a solid, viscid, or liquid substance or preparation that includes a substance of plant, such as a root, a leaf, a stem, a flower, a seed, a fruit, or other portion of a plant. In some embodiments, the botanical material is a raw material, a powder, or an extract. As used herein the term “processed” includes treatment of a botanical substance to develop an herbal medicine, a nutraceutical composition, or a dietary supplement, including grinding, heating, fermenting, compacting, degrading, drying, wetting, or otherwise processing the botanical substance for preparation of the end botanical product for use or consumption by a consumer.
The term botanical pertains to or relates to plants. The term “plant,” includes plants and plant parts including but not limited to plant cells and plant tissues such as leaves, stems, roots, flowers, pollen, fruit, bark, and seeds. The class of plants that can be used in the present invention is generally as broad as the class of higher and lower plants that may be commonly used in herbal medicines or in dietary supplements to provide a therapeutic or aesthetic benefit. In some embodiments, a botanical includes chamomile (including Matricaria chamomilla (also referred to as German chamomile or Matricaria recutita), feverfew (Tanacetum parthenium), Roman chamomile (Chamaemelum nobile syn anthemis nobilis), Chinese chamomile (Chrysanthemum x morifolium, or Chrysanthemum indicum), guarana (Paullinia cupana), parsley (Petroselinum crispum), celery (Apium graveolens), fennel (Foeniculum vulgare), Asian ginseng (Panax ginseng), American ginseng (Panax quinquefolius), Tienchi ginseng l (Panax notoginseng), Siberian ginseng (Eleutherococcus senticosus) Dong Quai (Angelica sinensis), garden angelica (Angelica archangelica), pubescent angelica (Angelica pubescens), dahurian angelica (Angelica dahurica), Chinese cinnamon (Cinnamomum cassia), true cinnamon (Cinnamomum verum syn Cinnamomum zeylanicum), Indonesian cinnamon (Cinnamomum burmannii), Ginkgo (Ginkgo biloba), Japanese sophora (Sophora japonica), buckwheat (Fagopyrum esculentum), jujube (Ziziphus spinosa), Indian jujube (Ziziphus mauritiana), Japanese raisin tree (Hovenia dulcis), ginger (Zingiber officinale), lesser galangal (Alpinia officinarum), greater galangal (Alpinia galanga), schisandra (Schisandra chinensis), southern schisandra (Schisandra sphenanthera), astragalus (Astragalus membranaceus), maca (Lepidium meyenii), radish (Raphanus sativus), turnip (Brassica rapa), peppermint (Mentha piperita), Chinese mint (Mentha canadensis), green tea (Camellia sinensis), rosemary (Rosmarinus officinalis), bilberry (Vaccinium myrtillus), blueberry (Vaccinium corymbosum), cranberry (Vaccinium macrocarpon), mulberry (Morus alba), or guarana (Paullinia cupana).
In some embodiments, the method of authenticating a botanical further includes isolating genomic DNA from a sample. As used herein, the term “isolate,” “isolating,” or “isolation,” or derivatives thereof refers to material, such as a nucleic acid or a protein, which is: (1) substantially or essentially free from components which normally accompany or interact with the material as found in its naturally occurring environment, (2) substantially or essentially free from components which accompany or interact the material in a processed form, such as in a dietary supplement or from a substance used during the isolation process, or (3) if the material is in its natural environment, the material has been altered by deliberate human intervention to a composition and/or placed at a locus in the cell other than the locus native to the material. Where the term “substantially purified” is used, this designation will refer to a composition in which the protein or peptide forms the major component of the composition, such as constituting about 50%, about 60%, about 70%, about 80%, about 90%, about 95% or more of the composition (i.e., for example, weight/weight and/or weight/volume). As used herein, the term “substantially purified” refers to molecules, either nucleic or amino acid sequences, that are removed from their natural environment or from a dietary supplement, isolated or separated, and are at least 60% free, preferably 75% free, and more preferably 90% free from other components with which they are naturally associated. An “isolated polynucleotide” is therefore a substantially purified polynucleotide.
Isolating botanical DNA fragments from a processed material can include use of isolation solvents, such as methanol, ethanol, water, acetone, or combinations thereof. In some embodiments, a kit for DNA isolation kit may be used, including for example, isolation using a DNeasy mericon Food Kit (Qiagen, Germantown, MD, USA) or the Cetyltrimethylammonium Bromide (CTAB) DNA isolation protocol. Other isolation techniques include lysis, heating, alcohol precipitation, salt precipitation, organic isolation, solid phase isolation, silica gen membrane isolation, CsCl gradient purification, or any combination thereof.
As used herein, the term “genomic DNA” refers to the chromosomal DNA sequence of a gene or segment of a gene, including the DNA sequences of non-coding as well as coding regions. Genomic DNA also refers to DNA isolated directly from cells or chromosomes or the cloned copies of all or part of such DNA. In some embodiments, the isolated genomic DNA is isolated from a processed botanical sample, such that the sample includes botanical DNA fragments. As used herein, fragmented DNA refers to portions of DNA having less than about 300 bp due to the processing of the botanical material, such as about 300 bp, 290 bp, 280 bp, 270 bp, 260 bp, 250 bp, 240 bp, 230 bp, 220 bp, 210 bp, 200 bp, 190 bp, 180 bp, 170 bp, 160 bp, 150 bp, 140 bp, 130 bp, 120 bp, 110 bp, 100 bp, 90 bp, 80 bp, 70 bp, 60 bp, 50 bp, 40 bp, 30 bp, 20, or 10 bp, or within a range defined by any two of the aforementioned values.
As used herein, “contig” refers to a nucleotide sequence that is assembled from two or more constituent nucleotide sequences that share common or overlapping regions of sequence homology. For example, the nucleotide sequences of two or more nucleic acid fragments can be compared and aligned in order to identify common or overlapping sequences. Where common or overlapping sequences exist between two or more nucleic acid fragments, the sequences (and thus their corresponding nucleic acid fragments) can be assembled into a single contiguous nucleotide sequence.
As used herein, “aligning” means the comparison of two or more nucleotide sequences based on the presence of short or long stretches of identical or similar nucleotides.
ITS2 is located between 5.8S and 26S in plant rRNA genes, and originated as an insertion that interrupted the ancestral 23S rRNA gene. During rRNA maturation, ITS regions are excised and rapidly degraded. In some embodiments, a DNA fragment size is determined. In some embodiments, following a determination of the size of the DNA fragment size, a region to authenticate a botanical may include an ITS2 region, a rbcL region, a trnL-trnF region, a matK region, or a trnH-psbA region. These or additional regions may be selected depending on the target botanical and the test scope. In some embodiments, a two-tiered approach for authenticating a botanical is implemented. In some embodiments, a first tier includes aligning a plurality of contigs based on a coding region. In some embodiments, a coding region can include a rbcL and matK coding region. In some embodiments, a second tier includes aligning a plurality of contigs based on a non-coding region. In some embodiments, a non-coding region can include ITS2, trnL-trnF, and psbA-trnH non-coding regions.
The rbcL region is a coding gene for plant chloroplast, sometimes used as a locus for analysis of phylogenetics in plant taxonomy. Similarly, the matK region is a coding gene for plant plastidial, and retains a well-conserved domain for use in DNA barcoding.
The term “nucleic acid sequence” as used herein can refer to the nucleic acid material itself and is not restricted to the sequence information (for example, the succession of letters chosen among the five base letters A, C, G, T, or U) that biochemically characterizes a specific nucleic acid, for example, a DNA or RNA molecule. As used herein, the terms “polynucleotide”, “nucleic acid”, or “oligonucleotide” refers to a linear polymer of natural or modified monomers or linkages, including deoxyribonucleic acid, deoxyribonucleosides, ribonucleosides, polyamide nucleic acids, and the like, joined by inter-nucleosidic linkages and have the capability of specifically binding to a target polynucleotide by way of a regular pattern of monomer-to-monomer interactions, such as Watson-Crick type of base pairing, and capable of being ligated to another oligonucleotide in a template-driven reaction. Usually monomers are linked by phosphodiester bonds or analogs thereof to form oligonucleotides ranging in size from a few monomeric units, e.g. 3-4, to several hundreds of monomeric units. Whenever a polynucleotide such as an oligonucleotide is represented by a sequence of letters, such as “ATGCCTG,” it will be understood that the nucleotides are in 5′→3′ order from left to right and that “A” denotes deoxyadenosine, “C” denotes deoxycytidine, “G” denotes deoxyguanosine, and “T” denotes deoxythymidine, unless otherwise noted. The letters A, C, G, and T can be used to refer to the bases themselves, to nucleosides, or to nucleotides including the bases, as is standard in the art. In naturally occurring polynucleotides, the inter-nucleoside linkage is typically a phosphodiester bond, and the subunits are referred to as “nucleotides.”
The terms “5′ ends” and “3′ ends” as used herein, refer to the termini of oligonucleotides because mononucleotides are reacted to make oligonucleotides in a manner such that the 5′ phosphate of one mononucleotide pentose ring is attached to the 3′ oxygen of its neighbor in one direction via a phosphodiester linkage. Therefore, an end of an oligonucleotide is referred to as the “5′ end” if its 5′ phosphate is not linked to the 3′ oxygen of a mononucleotide pentose ring. An end of an oligonucleotide is referred to as the “3′ end” if its 3′ oxygen is not linked to a 5′ phosphate of another mononucleotide pentose ring. As used herein, a nucleic acid sequence, even if internal to a larger oligonucleotide, also may be said to have 5′ and 3′ ends. In either a linear or circular DNA molecule, discrete elements are referred to as being “upstream” or 5′ of the “downstream” or 3′ elements. This terminology reflects the fact that transcription proceeds in a 5′ to 3′ fashion along the DNA strand. The promoter and enhancer elements which direct transcription of a linked gene are generally located 5′ or upstream of the coding region. However, enhancer elements can exert their effect even when located 3′ of the promoter element and the coding region. Transcription termination and polyadenylation signals are located 3′ or downstream of the coding region.
As used herein, the terms “complementary” or “complementarity” are used in reference to “polynucleotides” and “oligonucleotides” (which are interchangeable terms that refer to a sequence of nucleotides) related by the base-pairing rules. For example, the sequence “C-A-G-T,” is complementary to the sequence “G-T-C-A.” Complementarity can be “partial” or “total.” “Partial” complementarity is where one or more nucleic acid bases is not matched according to the base pairing rules. “Total” or “complete” complementarity between nucleic acids is where each and every nucleic acid base is matched with another base under the base pairing rules. The degree of complementarity between nucleic acid strands has significant effects on the efficiency and strength of hybridization between nucleic acid strands. This is of particular importance in amplification reactions, as well as detection methods which depend upon binding between nucleic acids.
In some embodiments, the method further includes ligating adapters to the botanical DNA fragments to generate adapter-ligated DNA fragments. The term “ligate” “ligating” or “ligation” refers to any method or composition wherein two different double stranded nucleotides have been joined into a single oligonucleotide strand. The term “adapter,” describes a short, oligonucleotide polynucleotide segment that can be joined to a polynucleotide molecule at either a blunt end or cohesive end. Adapters may contain restriction enzyme recognition sequences within the polynucleotide fragment. The size of the adapter can vary from about ten to about one-hundred and fifty nucleotides in length. Adapters can either be single stranded or double stranded. Adapter-ligated DNA fragments includes the botanical DNA fragments isolated from the processed botanical material ligated to the adapters, for example, as described and shown in
In some embodiments, the method further includes amplifying the adapter-ligated DNA fragments to detect the botanical DNA fragments. As described herein, botanical DNA fragments are present in dietary supplements in low quantity or low quality, or both, and therefore, are unable to be readily detected by conventional techniques. For example, in some embodiments, the botanical DNA fragments may be excessively degraded or sufficiently fragmented as to be incapable of being detected. In addition, in some embodiments, a target botanical DNA fragments may be present in a botanical product (for example, an herbal medicine, a nutraceutical composition, or a dietary supplement) in an amount of about 100 ng, 10 ng, 1 ng, 900 pg, 800 pg, 700 pg, 600 pg, 500 pg, 400 pg, 300 pg, 200 pg, 100 pg, 10 pg, 1 pg, 900 fg, 800 fg, 700 fg, 600 fg, 500 fg, 400 fg, 300 fg, 200 fg, 100 fg, or less, or an amount within a range defined by any two of the aforementioned values. In this way, botanical DNA fragments in processed botanical materials are sometimes referred to as “invisible,” referring to the inability to visualize or detect the fragments. Ligating adapters to the fragments followed by amplification enables detection of the fragments. As used herein the term “detection” or “visualization” refers to the ability to observe DNA fragments. The detection of the fragments allows for downstream analysis. Detection of the fragments can be performed by DNA detection techniques, including by Southern blot, the analysis of DNA on agarose or acrylamide gels to fractionate the DNA according to size, which may be followed by transfer and immobilization of the DNA from the gel to a solid support, such as nitrocellulose or a nylon membrane. The immobilized DNA may further be probed with a labeled oligodeoxyribonucleotide probe or DNA probe to detect DNA species complementary to the probe used. The DNA may be cleaved with restriction enzymes prior to electrophoresis. Following electrophoresis, the DNA may be partially depurinated and denatured prior to or during transfer to the solid support.
In some embodiments, the amplified adapter-ligated DNA is used to evaluate total DNA after amplification. As used herein, the term “evaluate” includes determining, assessing, quantifying, or counting the level or amount of DNA present in a sample, or determining, assessing, or quantifying the length of DNA fragments in a sample. Evaluating a sample may include use of a fluorometer, spectrophotometer, or other bioanalyzer capable of determining the concentration and length of DNA fragments in a sample. In some embodiments, fragment length may be assessed by TapeStation™, which provides average size in base pairs.
In some embodiments, the method further includes hybridizing a species-specific primer set to a target nucleic acid sequence with the botanical DNA fragments. As used herein, the term “hybridizing”, “hybridize”, “hybridization”, “annealing”, or “anneal” are used interchangeably in reference to the pairing of complementary nucleic acids using any process by which a strand of nucleic acid joins with a complementary strand through base pairing to form a hybridization complex. Hybridization and the strength of hybridization (for example, the strength of the association between the nucleic acids) is impacted by such factors as the degree of complementarity between the nucleic acids, stringency of the conditions involved, the melting temperature (Tm) of the formed hybrid, and the G:C ratio within the nucleic acids.
As used herein, the term “amplification primer” and “primer” refers to an oligonucleotide, which is capable of site-specifically annealing to an RNA or DNA region adjacent a target sequence, and serving as an initiation primer for DNA synthesis under suitable conditions in which synthesis of a primer extension product is induced, e.g., in the presence of nucleotides and a polymerization-inducing agent such as a DNA-dependent DNA polymerase and at suitable temperature, pH, metal concentration, and salt concentration. Typically, a PCR reaction employs a pair of amplification primers also known as “primer pairs” or “primer sets” including an “upstream” or “forward” primer and a “downstream” or “reverse” primer, which delimit a region of the RNA or DNA to be amplified.
Primer sequences for chamomile authentication may include the nucleic acid sequences as set forth in Table 1. In some embodiments, the primer set for detection of DNA fragment size is a P5 adapter sequence and a P7 adapter sequence as set forth in Table 1.
Thus, in some embodiments, the species-specific primer set is a primer set capable of hybridizing to German chamomile, such that the primer set includes a forward primer defined by a nucleic acid sequence set forth by SEQ ID NO: 1 and a reverse primer defined by a nucleic acid sequence set forth by SEQ ID NO: 2. In some embodiments, the species-specific primer set is a primer set capable of hybridizing to feverfew, such that the primer set includes a forward primer defined by a nucleic acid sequence set forth by SEQ ID NO: 3 and a reverse primer defined by a nucleic acid sequence set forth by SEQ ID NO: 4. In some embodiments, the species-specific primer set is a primer set capable of hybridizing to Roman chamomile, such that the primer set includes a forward primer defined by a nucleic acid sequence set forth by SEQ ID NO: 5 and a reverse primer defined by a nucleic acid sequence set forth by SEQ ID NO: 6. In some embodiments, the species-specific primer set is a primer set capable of hybridizing to Chinese chamomile, such that the primer set includes a forward primer defined by a nucleic acid sequence set forth by SEQ ID NO: 7 and a reverse primer defined by a nucleic acid sequence set forth by SEQ ID NO: 8.
Primer sequences for targeted amplicon sequencing based botanical authentication may include the nucleic acid sequences as set forth in Table 2. In some embodiments, the primer set may be flanked my M13 sequence or Illumina adapter sequence to facilitate sequencing.
In some embodiments, a primer set is designed for target species-specific PCR amplification, wherein the target species includes one or more of a target botanical, including for example, ginger (Zingiber officinale), chamomile (including Matricaria chamomilla (also referred to as German chamomile or Matricaria recutita), Tanacetum parthenium (feverfew), Chamaemelum nobile (Anthemis nobilis or Roman chamomile), Chrysanthemum x morifolium, or Chrysanthemum indicum (Chinese chamomile)), guarana (Paullinia cupana), parsley (Petroselinum crispum), Asian ginseng (Panax ginseng), or schisandra (Schisandra chinensis), Maca (Lepidium_meyenii), Astragalus (Astragalus propinquus), Ginkgo (Ginkgo biloba), TangKuei (Angelica sinensis), True Cinnamomum (Cinnamomum_verum).
In some embodiments, the sequenced signature region needs to be compared to a signature sequence database Table 3 to authenticate botanicals.
Cinnamomum
aromaticum
Cinnamomum
burmannii
Cinnamomum
verum
Cinnamomum
aromaticum
Cinnamomum
burmannii
Cinnamomum
verum
Panax
quinquefolius
Panax
ginseng
Eleutherococcus
senticosus
Panax
notoginseng
Petroselinum
crispum
Foeniculum
vulgare
Apium
graveolens
Ginkgo
biloba
Sophora
japonica
Fagopyrum
esculentum
Zingiber
officinale
Zingiber
officinale
Zingiber
officinale
Zingiber
officinale
Alpinia
officinarum
Alpinia
officinarum
Alpinia
officinarum
Alpinia
galanga
Alpinia
galanga
Alpinia
galanga
Zingiber
officinale
Alpinia
officinarum
Alpinia
galanga
Zingiber
officinale
Alpinia
officinarum
Alpinia
galanga
Ziziphus
jujuba var
spinosa
Ziziphus
jujuba var
spinosa
Ziziphus
mauritiana
Ziziphus
mauritiana
Ziziphus
mauritiana
Hovenia
dulcis
Angelica
sinensis
Angelica
sinensis
Angelica
pubescentis
Angelica
pubescentis
Angelica
dahuricae
Angelica
dahuricae
Angelica
sinensis
Angelica
pubescentis
Angelica
dahuricae
Schisandra
chinensis
Schisandra
sphenanthera
Schisandra
chinensis
Schisandra
sphenanthera
Schisandra
chinensis
Schisandra
sphenanthera
Schisandra
chinensis
Schisandra
sphenanthera
Astragalus
membranaceus
Lepidium
meyenii
Raphanus
sativus
Brassica
rapa
Brassica
rapa
Matricaria
chamomilla
Matricaria
chamomilla
Matricaria
chamomilla
Tanacetum
parthenium
Tanacetum
vulgare
Chamaemelum
nobile
Chamaemelum
nobile
Chamaemelum
nobile
Chrysanthemum
indicum
Chrysanthemum x
morifolium
Primer sequences for tiling PCR and sequencing of Camellia sinensis two-tiered barcodes may include the nucleic acid sequences as set forth in Table 4. In some embodiments, the primer set may be flanked by M13 sequence or Illumina adapter sequence to facilitate sequencing.
In some embodiments, the sequenced tiling amplicon needs to be aligned to full-length barcode regions for authenticating botanicals.
In some embodiments, a PCR-based primer or species-specific primers may be designed based on the detection of DNA fragment size. In some embodiments, for example, design of the primers may be performed with a program, such as the program “Primer-BLAST”, on the basis of target species consensus sequence as PCR template and non-target consensus sequences as exclusion sequences.
In some embodiments, the method further includes amplifying the target nucleic acid sequence. As used herein, the term “amplifying” refers to a process whereby a portion of a nucleic acid is replicated using, for example, any of a broad range of primer extension reactions. Exemplary primer extension reactions include, but are not limited to, PCR. Unless specifically stated, “amplifying” refers to a single replication or to an arithmetic, logarithmic, or exponential amplification. The term “in silico” refers to processes taking place via computer calculations Amplification can be performed using standard amplification reactions and conditions. In some embodiments, amplification is performed at 1 cycle at 95° C., followed by 12 cycles of 30 seconds at 95° C., 30 seconds at 58° C., 2 minutes at 72° C., and a final extension step at 72° C. for 5 minutes. The cycle number, time, and temperature can be modified, and the steps described herein are provided by way of example, and not to be limiting.
As used herein, the terms “PCR product,” “PCR fragment,” and “amplification product” refer to the resultant mixture of compounds after two or more cycles of the PCR steps of denaturation, annealing and extension are complete. These terms encompass the case where there has been amplification of one or more segments of one or more target sequences.
In some embodiments, the method further includes sequencing the target nucleic acid sequence. As used herein “sequence determination”, “determining a nucleotide base sequence”, “sequencing”, identifying and like terms includes determination of partial as well as full sequence information of a botanical DNA fragment. That is, the term includes sequence comparisons, fingerprinting, and similar determination of information about a target polynucleotide, as well as the express identification and ordering of each nucleoside of the target polynucleotide within a region of interest. In certain embodiments, “sequence determination” includes identifying a single nucleotide, while in other embodiments more than one nucleotide is identified. Identification of nucleosides, nucleotides, and/or bases are considered equivalent herein. It is noted that performing sequence determination on a polynucleotide typically yields equivalent information regarding the sequence of a perfectly complementary polynucleotide and thus is equivalent to sequence determination performed directly on a perfectly complementary polynucleotide.
As used herein, the term “sequence alignment” refers to a listing of multiple DNA or amino acid sequences and aligns them to highlight their similarities. The listings can be performed in silico and can be made using bioinformatics computer programs.
As used herein, “comparing” refers to making an assessment of how sequences in a sample relates to sequences in a standard, control, or comparative sample. For example, “comparing” may refer to assessing whether the sequence from one sample is the same as, varies from at specific nucleotide or amino acid positions, or differs from the sequence in standard, control, or comparative sample.
Some embodiments provided herein relate to a kit for authentication of botanical DNA fragments isolated from a botanical product, such as from a dietary supplement, herbal medicine, or nutraceutical composition that includes a botanical extract. Any of the reagents, compositions, or materials described herein may be included in a kit. In a non-limiting example, a kit may include the following components, each component being in a suitable container: isolation reagents for isolating botanical DNA fragments from a processed botanical sample; ligation-adapters for ligating adaptors to the botanical DNA fragments; end-repair and ligation reagents; a species-specific primer set for hybridizing to a target nucleic acid sequence; or amplification reagents for amplifying ligated adapter DNA fragments.
In some embodiments, the isolation reagents may itself be a kit, for example, a DNA isolation kit such as a DNeasy mericon Food Kit (Qiagen, Germantown, MD, USA) or similar DNA isolation kit. In some embodiments, the isolation reagents may include isolation solvents, including, for example, methanol, ethanol, water, acetone, or combinations thereof.
In some embodiments, the ligation-adapters may include a prepared a kit, for example a Quick Ligation Kit including ligation enzymes (ligase), a ligation buffer, and adapters of a known DNA sequence. In some embodiments, the ligation-adapters may include specified ligase, ligation buffers, and adapters of a known DNA sequence, and further including end repair reagents.
In some embodiments, the species-specific primer set includes a primer set of a known DNA sequence, including a forward and a reverse primer for a known botanical target. For example, in some embodiments, a primer set can include a forward primer including a nucleic acid sequence as defined by SEQ ID NO: 1 and a reverse primer including a nucleic acid sequence as defined by SEQ ID NO: 2. In some embodiments, a primer set can include a forward primer including a nucleic acid sequence as defined by SEQ ID NO: 3 and a reverse primer including a nucleic acid sequence as defined by SEQ ID NO: 4. In some embodiments, a primer set can include a forward primer including a nucleic acid sequence as defined by SEQ ID NO: 5 and a reverse primer including a nucleic acid sequence as defined by SEQ ID NO: 6. In some embodiments, a primer set can include a forward primer including a nucleic acid sequence as defined by SEQ ID NO: 7 and a reverse primer including a nucleic acid sequence as defined by SEQ ID NO: 8.
In some embodiments, the amplification reagents can include reagents used in nucleic acid amplification reactions and may include, but are not limited to, buffers, reagents, enzymes having reverse transcriptase and/or polymerase activity or exonuclease activity, enzyme cofactors such as magnesium or manganese, salts, nicotinamide adenine dinuclease (NAD) and deoxynucleoside triphosphates (dNTPs), such as deoxyadenosine triphosphate, deoxyguanosine triphosphate, deoxycytidine triphosphate and thymidine triphosphate.
A kit may also include instructions for employing the kit components as well the use of any other reagent not included in the kit. Instructions may include variations that can be implemented.
Embodiments of the present invention are further defined in the following Examples. It should be understood that these Examples are given by way of illustration only. From the above discussion and these Examples, one skilled in the art can ascertain the essential characteristics of this invention, and without departing from the spirit and scope thereof, can make various changes and modifications of the embodiments of the invention to adapt it to various usages and conditions. Thus, various modifications of the embodiments of the invention, in addition to those shown and described herein, will be apparent to those skilled in the art from the foregoing description. Such modifications are also intended to fall within the scope of the appended claims. The disclosure of each reference set forth herein is incorporated herein by reference in its entirety.
Botanical Samples
Twenty-four botanical samples that covered all major plant parts and processing stages were collected for DNA profiling. Among these twenty-four samples, powders and extracts were considered as finished materials in the manufacturing process. When available, extracts from different lots were included to minimize DNA profile fluctuation within the same manufacturing process. All samples are listed in Table 5 with their scientific names, types, sample codes, plant parts, and excipient information. Additional chamomile extracts and tea extracts from different lots were collected to study the effect of isolation solvent composition and filtration processes on DNA in botanical extracts, as shown in Table 6. All samples were collected from the Herbalife manufacture line.
Zingiber officinale
Zingiber officinale
Zingiber officinale
Matricaria chamomilla
Matricaria chamomilla
Matricaria chamomilla
Paullinia cupana
Paullinia cupana
Paullinia cupana
Petroselinum crispum
Petroselinum crispum
Petroselinum crispum
schisandra
Schisandra chinensis
Schisandra chinensis
Matricaria
chamomilla
Camellia
sinensis
GeneRuler 50 bp DNA Ladder (Thermo Fisher Scientific, Waltham, MA, USA) was used to provide fragments with various lengths to test the range of adapter ligated DNA fragments that can be amplified.
Maltodextrin samples (M100, M150, M180, M500, M580, M585, and M600) were purchased from Grain Processing Corporation (Lawrenceville, GA, USA).
DNA Isolation
The botanical reference materials were ground into fine powders using 1600 MiniG (SPEX® SamplePrep, Metuchen, NJ, USA) at a frequency of 1500 RPM for 1 minute. Genomic DNA was isolated using DNeasy mericon Food Kit (Qiagen, Germantown, MD, USA) according to the manufacturer's instructions. Input of dietary supplements for DNA isolation was 50 mg for dried raw materials and botanical powders and 400 mg for botanical extracts.
Genomic DNA Characterization
Concentration: The isolated genomic DNA was quantified with a Qubit 3.0 Fluorometer and Qubit® dsDNA HS assay kit (Thermo Fisher Scientific, Waltham, MA, USA) according to the manufacturer's protocol.
UV absorbance ratio (A260/A280): UV absorbance ratio (A260/A280) was measured using spectrophotometer NanoDrop ND 8000 (Thermo Fisher Scientific, Waltham, MA, USA).
Size detection: The size of the isolated genomic DNA was detected on the 4200 TapeStation instrument with Genomic DNA ScreenTape and reagents (Agilent, Santa Clara, CA, USA). The size of amplified DNA was detected on the 4200 TapeStation instrument with HS (High Sensitivity) D1000 Tape and reagents (Agilent, Santa Clara, CA, USA).
The following example demonstrates a method for detecting botanical genomic DNA present in low concentrations by adapter ligation and PCR amplification.
End repair reagents, adapter, and ligation reagents from KAPA Hyper Prep Kit (Kapa Biosystems, Wilmington, MA, USA) were used in the end repair and adapter ligation step. Briefly, input DNA at various amounts was used as input fragmented DNA according to the manufacturer's instructions. To achieve higher ligation efficacy, ligation was performed at 4° C. overnight with adapter concentration adjusted to 300 nM. After DNA fragments ligated to adapters with a known DNA sequence, the adapter-ligated DNA was purified with Agencourt AMPure XP beads (0.8×) (Beckman Coulter, Indianapolis, IN, USA) and eluted with 25 μL of water. The PCR amplification was carried out in a 25 μL reaction mixture containing 12.5 μL of 2× AmpliTaq Gold® 360 Master Mix (Applied Biosystems, Waltham, MA, USA), 10 μL of adapter-ligated DNA, 1.25 μL each of forward and reverse primers (0.5 mM) (forward primer (P5): 5′-AATGATACGGCGACCACCGA-3′ (SEQ ID NO: 9) and reverse primer (P7): 5′-CAAGCAGAAGACGGCATACGA-3′ (SEQ ID NO: 10)). The PCR reaction was performed in a Bio-Rad C-1000 Touch Thermal Cycler (Bio-Rad, Hercules, CA, USA). The optimized amplification protocol included 1 cycle of 5 minutes at 95° C., followed by 12 cycles of 30 seconds at 95° C., 30 seconds at 58° C., 2 minutes at 72° C., and a final extension step at 72° C. for 5 minutes. The resulted PCR products were purified with Agencourt AMPure XP beads (1.0×) and eluted with 25 μL of water before detection.
To define the range of amplifiable adapter-ligated DNA fragment lengths, log-diluted GeneRuler 50 bp DNA ladder was used as input DNA at 1 ng, 100 pg, 10 pg, 1 pg, 100 fg, 10 fg, and 1 fg. For DNA isolated from maltodextrin and botanical samples, 10 μL of crude eluted DNA was used as input DNA for KAPA Hyper Prep Kit before detection. Experiment conditions were as described above.
Welch two sample t-test (two-sided) was performed to analyze the changes in DNA concentration between unfiltered and filtered tea extracts.
Genomic DNA of five botanical species, derived from botanical materials of different process types, was isolated by Qiagen DNeasy mericon Food Kit. The concentrations and absorbance ratios (A260/A280) of the eluted DNA were determined by fluorometer and spectrophotometric analysis respectively (Table 7). The dried raw materials yielded the highest DNA concentration among all types of materials in the same species. DNA concentrations from most sterilized botanical powders and extracts were usually 10 times lower than DNA concentrations from dried raw materials (except chamomile flower powder), with some of them even falling below the concentration range that the fluorometer can accurately measure (concentration labeled as too low). The ratio of absorbance at A260/A280 is generally used to measure the purity of DNA samples, with values between 1.7 and 1.9 indicating pure DNA. The absorbance ratios were usually acceptable when the DNA concentrations were above 1 ng/μL (
The integrity of isolated genomic DNA from various herbal products was compared by TapeStation with genomic DNA tape (
DNA integrity numbers (DINs) estimated by TapeStation analysis software showed genomic DNA isolated from dried botanical materials have the highest value, followed by DNA from sterilized powders. No DINs were estimated for DNA from botanical extracts since their signals were below the quantitative threshold required to trigger the DIN estimation by TapeStation analysis software.
Based on the observation that all visible genomic DNA isolated from processed materials was fragmented to a length below 1000-bp, the reagent provided by KAPA Hyper Prep Kit was applied to amplify the low amount of DNA fragments (
Given that most of the botanical extracts used in this study contain corn starch-derived maltodextrin, the amount of DNA contributed by maltodextrin was evaluated to provide a baseline DNA signal. DNA was isolated from seven types of commonly used maltodextrin and its concentration and size range was measured by fluorometer and TapeStation, respectively. The results indicated that DNA isolated from maltodextrin had concentration below the detection range of fluorometer most of the time, and when the concentrations were measurable, the readings were at the low end of the fluorometer detection range (Table 9). No types of maltodextrin consistently produced DNA isolations with measurable concentration. After 12 cycles of PCR amplification of the adapter-ligated DNA, none of the DNA isolations exhibited a visible smear on TapeStation HS D1000 tape, except a major adapter dimer band and an occasional 185-bp minor band. Both of these bands also showed up in the non-template control (NTC) (
To detected fragmented DNA in botanical powders and extracts, DNA isolations that were below the detection limit of TapeStation genomic tape were ligated by adapter followed by 12 cycles of PCR amplification. DNA smears were observed in all processed botanical powders and extractions. The size distribution of these smears ranged from 150-bp to 350-bp (
In addition to some common process steps, such as grinding and extensive heat treatment, specific manufacturing processes have been applied to certain botanicals to achieve the highest enrichment of bioactive ingredients and to meet regulatory requirements.
For botanical extracts, water and ethanol are the two most frequently used solvents in DNA isolation. To study the effect of different solvents on the DNA retained in botanical extracts, DNA in chamomile extracts, which were made using different isolation solvent ratios, was detected by adapter ligation and PCR amplification. Both aqueous and hydro-alcoholic isolation methods yielded DNA that can be easily seen by TapeStation after amplification (
Filtration is often used to separate particles from a solution after the solvent isolation procedure. To compare the effects of filtration on the DNA retained in botanical extracts, the size and concentration of DNA from unfiltered and filtered tea extracts were determined. DNA was present in tea extracts regardless of filtration process (
The following example demonstrates a method for authenticating botanical DNA fragments from a chamomile dietary supplement.
Botanical reference materials (BRMs) were purchased from ChromaDex or AHP. Two-tiered barcodes, rbcL and ITS2, were amplified with universal primers and Sanger sequenced to confirm the molecular identity of these commercial BRMs (data not shown). Six German chamomile herbal supplements (three powders and three extracts), two feverfew extracts, and two Chinese chamomile extracts from different manufacturers were purchased online.
The botanical reference materials were ground into fine powders using 1600 MiniG (SPEX® SamplePrep, Metuchen, NJ, USA) at a frequency of 1500 RPM for 1 minute. Then genomic DNA was isolated using a DNeasy Plant Mini Kit (Qiagen, Germantown, MD, USA), according to the manufacturer's instructions. Dietary supplements in the form of powder and extract were isolated using a DNeasy mericon Food Kit (Qiagen, Germantown, MD, USA), according to the manufacturer's instructions. Input dietary supplements for DNA isolation was 50 mg for botanical powders and 400 mg for botanical extracts.
Concentration: The isolated genomic DNA was quantified with a Qubit 3.0 Fluorometer and Qubit® dsDNA HS assay kit (Thermo Fisher Scientific, Waltham, MA, USA) according to the manufacturer's protocol.
Size: The size of the isolated genomic DNA was detected on 4200 TapeStation instrument with Genomic DNA ScreenTape and reagents (Agilent, Santa Clara, CA, USA). For the isolated DNA beyond the detection limit of 4200 TapeStation, further amplification of the genomic DNA was performed by KAPA hyper prep kit (Kapa Biosystems, Wilmington, MA, USA) before detection. Briefly, 10 μL of the isolated genomic DNA went through the library construction protocol as input fragmented DNA according to the manufacturer's instructions. After ligated to adapters with known DNA sequence (adapter concentration adjusted to 300 nM for low-input DNA), input DNA was amplified with primer mix provided in the Kit. The reaction performed in a Bio-Rad C-1000 Touch Thermal Cycler (Bio-Rad) using a modified amplification protocol consisted of 1 cycle of 2 minutes at 98° C., followed by 15 cycles of 30 seconds at 98° C., 30 seconds at 58° C., 60 seconds at 72° C., and a final extension step at 72° C. for 3 minutes. The resulted PCR products were beads-purified (0.8×) and detected again on 4200 TapeStation instrument with High Sensitivity D1000 Tape and reagents (Agilent, Santa Clara, CA, USA).
ITS2 barcode region was selected in this study, because it not only capable of discriminating plant taxa from different plant families, but is also able to distinguish closely related taxa at the genus and species levels (Chen, et al. (2010). Validation of the ITS2 region as a novel DNA barcode for identifying medicinal plant species. PLoS One, 5(1), e8613, incorporated herein by reference in its entirety). Multiple ITS2 sequences of species in the test scope were downloaded from Genbank. Matricaria chamomilla: KX167615, EU179212, KC816562; Tanacetum parthenium: EF577320, KU724224, KR150179; Chamaemelum nobile: EU179215; Chrysanthemum x morifolium: AB064276, KC215400, FJ980331, EF091597; Chrysanthemum indicum: JF421484, KJ183125, KC215403. To avoid potential artefacts and errors in the uncurated public database, such as Genbank, a serial of bioinformatic curation steps were undertaken on all sequences in the above dataset. To evaluate these barcodes, phylogenetic analysis was performed using the neighbor-joining method with 1000 bootstrap replicates via the Molecular Evolutionary Genetic Analysis (MEGA) software program (version 7). Matricaria chamomilla ITS2 barcode KC816562 was removed from downstream analysis, because it did not shared the same node on the tree with other Matricaria chamomilla ITS2 sequences.
To incorporate in-species sequence variation in primer design, retained ITS2 sequences were grouped by species and merged to generate species-level consensus sequences in BioEdit (version 7.2.6). Species-specific primers were developed with the program “Primer-BLAST” on the basis of target species consensus sequence as PCR template and non-target consensus sequences as exclusion sequences. The designed primers were checked against the alignment of species-level consensus sequences for each species in the test scope. All primers were synthesized by IDT (Integrated DNA Technologies, Skokie, IL, USA).
Two primer sequences in the same strand were concatenated into one sequence separated by 5 Ns and BLAST searched in the GenBank database. The search was specified by the following parameters. Database: Nucleotide Collection (nr/nt); Program Selection: Somewhat similar sequences (blastn) program; Algorithm parameters: word size (7), expect threshold (1000), the low complexity filter (off). Returned entries were filtered to select entries with query cover percentage match the percentage of combined forward and reverse primers in query.
The PCR amplification was carried out in a 20 μL reaction mixture containing 10 μL of 2× AmpliTaq Gold® 360 Master Mix (Applied Biosystems, Waltham, MA, USA), 3 μL of genomic DNA isolate, 1 μL each of forward and reverse primers (0.5 μM). The PCR reaction was performed in a Bio-Rad C-1000 Touch Thermal Cycler (Bio-Rad, Hercules, CA, USA). The optimized amplification protocol consisted of 1 cycle of 5 minutes at 95° C., followed by 35 cycles of 30 seconds at 95° C., 30 seconds at 61° C., 30 seconds at 72° C., and a final extension step at 72° C. for 2 minutes. DNA isolated from BRMs was diluted 100-fold before subject to PCR amplification. The amplification product was separated in a 2% agarose gel, stained with GelRed™ Nucleic Acid Gel Stains (Biotium, Hayward, CA, USA) and detected under UV light. The size of the PCR product was measured using a GeneRuler 50 bp DNA Ladder (Thermo Fisher Scientific, Waltham, MA, USA).
Genomic DNA was prepared from botanical BRMs and serial half-log dilutions were made from 1 ng/μL to 100 ag/μL. PCR product was detected on agarose gel and the limit of detection was determined to be the highest dilution which produced a visible amplicon at expected size across all three independent assays.
The quantity and quality of genomic DNA isolated from finished herbal products is one of the major concerns for the applicability of PCR-based analytical methods. To design DNA-based German chamomile authentication methods that can be applied to most German chamomile dietary supplements, DNA isolated from different forms of herbal products and various manufacturers are characterized. The concentration of double-stranded DNA ranges from 60 ng/μL-5.0 ng/μL in DNA isolated from raw German chamomile, ranges from 30 ng/μL-3.0 ng/μL in DNA isolated from capsulized powders, and ranges from 0.3 ng/μL to 0.01 ng/μL in chamomile extracts (
Due to the intensive manufacture process, DNA isolated from processed herbal products are always damaged or fragmented to the size range, which cannot be amplified by traditional universal primers that were designed for full-length barcodes. The fragment size of the isolated genomic DNA was evaluated by TapeStation 4200 with genomic DNA tape (
To further detect the size of these extract-derived DNA, DNA fragments were ligated to DNA adaptor with known sequence, and then PCR amplified for 12 cycles. Based on the observation that DNA is heavily degradation in botanical extracts, high-sensitivity tape designed for DNA fragment between 25 bp to 1000 bp was used to evaluate extract-derived DNA after PCR amplification. The majority of the DNA fragments fall into the size range between 180 bp and 400 bp with the length of adaptor on both ends taken into account (
German chamomile authentication test were designed based on the genomic DNA profile isolated from German chamomile dietary supplements (
In-silico specificity was assessed by searching primer sequence in BLAST program. Candidate target species are the BLAST returned species, whose sequence was covered by both forward and reverse primer sequences. Primers used in German chamomile ID test yield Matricaria chamomilla var. recutita as the only species. Primers used in feverfew ID test yield multiple species in genus Tanacetum, Achillea, Tripleurospermum, Anthemis, and Oncosiphon. The candidate species, in genus Tanacetum, includes feverfew (Tanacetum parthenium) and Tansy (Tanacetum vulgare), which sometimes mistakenly supplied as feverfew. For candidate species in genus Anthemis, Roman chamomile (Chamaemelum nobile), also known as, Anthemis nobilis, is not listed. Primers used in Roman chamomile ID test yield Chamaemelum nobile as the only species. Primers used in Chinese chamomile ID test yield only Chrysanthemum spp., which include the target species, Chrysanthemum indicum and Chrysanthemum x morifolium. Although in-silico analysis indicated that feverfew ID test and Chinese chamomile ID test may not be specific to the targeted species, each individual test is specificity to the species in the test scope by in-silico prediction (Table 3).
Since in-silico prediction does not consider the limitations and variations of biochemical reaction in the PCR tube and the majority genome sequences in the targeted species have not been sequenced (Henriques, et al. (2012). BMC Res Notes, 5, 637; Huws, et al. (2007). J Microbiol Methods, 70(3), 565-569; Morales, et al. (2009). Appl Environ Microbiol, 75(9), 2677-2683, each of which is incorporated by reference herein in its entirety), experimental analytic specificity was assessed using BRMs that represent target species in the test scope. Matricaria chamomilla, Tanacetum parthenium, Chamaemelum nobile, and Chrysanthemum x morifolium BRMs were included in the analysis, where genomic DNA of each BRM species was tested by the whole chamomile authentication test for cross-reactivity. German chamomile ID test produced an amplicon around 100 bp (expected size, 103 bp), no amplicon was amplified from non-target species (
Analytical sensitivity, also known as limit of detection (LOD), is defined as the lowest concentration of genomic DNA can be reliably detected and distinguished from a negative result. LOD is crucial, because the German chamomile authentication test is being used to detect the presence of chamomile signal in DNA of low quantity. Because individual test targets different DNA sequences with various copy number in the genome, the LOD for each test must be evaluated separately. To address the LOD for each individual test, serial half-log dilutions were made from each BRM genomic DNA. For each dilution, 3 μL was used as DNA template for PCR. The signal intensity of the expected amplicon was evaluated on agarose gels. The LOD was 3.16 fg/μL, 316.5 ag/μL, 1 fg/μL, and 31.6 fg/μL for German chamomile, feverfew, Roman chamomile, and Chinese chamomile ID test, respectively (
Since LOD was determined based on genomic DNA in good quality and the raw genomic DNA concentration from botanical extracts measured by Qubit also include the heavily degraded DNA, the actual amount of amplifiable genomic DNA remains to be determined. With the genomic DNA fragment size available after PCR amplification, the original amplifiable genomic DNA isolated from botanical extracts was calculated (
The chamomile authentication test was applied to German chamomile dietary supplements sold on the market. The results showed that German chamomile ID test is positive for all three tested German chamomile powders and all three German chamomile extracts (
To demonstrate that the other tests can successfully detect botanical substitution and contamination, two additional feverfew and one Chinese chamomile extract were tested. The results showed that feverfew ID test is able to amplify feverfew specific signal from both tested feverfew extract and Chinese chamomile ID test amplified specific signal from the Chinese chamomile extract (
To validate the result of DNA-based chamomile authentication test, a signature region that can differentiate all species in test scope was amplified by a set common primer. Next-generation sequencing was used to tally reads and assign species identity based on signature sequences (
To further demonstrate the high probability of detection of the DNA-based chamomile authentication test in real life situation, a proof-of-concept example using German chamomile as target botanical and feverfew as potential adulterants was designed. In this example, additional German chamomile extracts manufactured under different conditions and diluted DNA from feverfew extracts were tested (Table 10). In detail, three independent DNA extractions were performed on German chamomile extracts [6 in-house+2 commercial]. Each sample was tested by German chamomile ID test in triplicates to reach 72 replicates for statistical probability of detecting target botanical material with 95% confidence. Three independent DNA extractions were performed on 2 common adulterant powders and plant parts [6 commercial]. Each sample was further diluted to 5% of its original concentration and evaluated by feverfew ID test in triplicates to reach 54 replicates (a minimum of 51) for probability of detecting non-target adulterant botanical materials with 95% confidence. One representative result was shown in
In certain circumstances, targeted amplification of DNA sequence does not have enough discrimination power to differentiated close species, so after confirming the existence and size of the target botanical DNA, a test scope specific primer was designed to amplify species signature regions and the fragment was subjected to DNA sequencing for botanical authentication purpose. The following example demonstrates a method for authenticating botanical DNA fragments from an Asian ginseng dietary supplement, which has many similar close species also sold on the market.
To detected fragmented DNA in ginseng extract product, DNA isolations were ligated by adapter followed by 12 cycles of PCR amplification. The optimized amplification protocol included 1 cycle of 5 minutes at 95° C., followed by 12 cycles of 30 seconds at 95° C., 30 seconds at 58° C., 2 minutes at 72° C., and a final extension step at 72° C. for 5 minutes. The resulted PCR products were purified with Agencourt AMPure XP beads (1.0×) and eluted with 25 μL of water before detection. DNA smears were observed in all processed botanical extractions with size ranged from 150-bp to 350-bp (
To differentiate Asian ginseng (Panax ginseng) from American ginseng (Panax quinquefolius), Tienchi Ginseng (Panax notoginseng) and Siberian ginseng (Eleutherococcus senticosus), a scope specific common primer set (SEQ ID 11 and SEQ ID 12 flanked with Illumina adaptor sequence) was designed to amplify and enrich the Asian ginseng signature regions. The optimized amplification protocol included 1 cycle of 5 minutes at 95° C., followed by 35 cycles of 30 seconds at 95° C., 30 seconds at 58° C., 30 seconds at 72° C., and a final extension step at 72° C. for 2 minutes. The resulted PCR products were purified with Agencourt AMPure XP beads (1.0×) and further indexed and subjected to sequencing by MiSeq.
Based on the signature sequence, Asian ginseng extract can be authenticated by comparing to Table 3. Other botanicals in Tables 2 and 3 can be authenticated in similar fashion.
For raw botanical parts, the use of multiple full-length DNA barcodes (400-800 bp) that extends the total target barcode sequence length for botanical authentication has been accepted by many researchers and study projects. Studies show that a two-locus combination gives better discrimination power than a single-locus, while a three-locus combination does not provide additional discrimination power over the optimal two-locus combination. The choice of two barcodes in the current method is a compromise between barcode discrimination power and cost.
Barcodes were derived from either coding or non-coding regions. Coding region barcodes encode proteins, so the pattern of nucleotide substitution in these barcode region was restrained by conservative protein domains or motifs (21). As a result, their discrimination power at the species level was not completely adequate. In contrast, non-coding region barcodes are less restrained in evolution, so the resulting higher sequence diversity leads to higher discrimination power at the species level. Many researchers use two-tiered DNA barcode strategy, which 1) separates coding and non-coding region barcodes into two tiers, and 2) examines DNA barcodes from each tier. This not only maintain the efficiency of using bioinformatics tools in the first tier (coding) barcodes, but also retains optimal discrimination power that is possessed mainly by the second tier (non-coding) barcodes.
Method for authenticating raw botanical material ingredients using two-tiered DNA barcoding to meet regulatory compliance was performed. However, for fragmented DNA in botanical extract, small DNA size prevented successful collection of two-tiered full-length DNA barcodes. For example, DNA in green tea and black tea was usually below 400 bp (
Tea genomic DNA was isolated using a DNeasy Plant Mini Kit (Qiagen, Germantown, MD, USA), according to the manufacturer's instructions. Four multiplex PCR amplifications were carried out in a 20 μL reaction mixture containing 10 μL of 2× AmpliTaq Gold® 360 Master Mix (Applied Biosystems, Waltham, MA, USA), 2 μL of genomic DNA isolate, 2 μL of primers pool (Table 11), and 1 μL of water. The PCR reaction was performed in a Bio-Rad C-1000 Touch Thermal Cycler (Bio-Rad, Hercules, CA, USA). The optimized amplification protocol consisted of 1 cycle of 5 minutes at 95° C., followed by 35 cycles of 30 seconds at 95° C., 30 seconds at 56° C., 30 seconds at 72° C., and a final extension step at 72° C. for 3 minutes.
Representative multiplex PCR results were shown in
Sequencing was performed on an Illumina MiSeq platform, aligned by bowtie2 and barcode coverage calculated by bedtools. The aligned reads with high percentage of barcode sequence coverage in shown in
The following example demonstrates a method for authenticating botanical material using two-tiered DNA barcoding.
DNA barcoding methods for botanical identification have to be adequately validated to meet regulatory compliance. This example demonstrates a validation protocol for a two-tiered DNA barcoding method that aims to identify raw botanical ingredients used in herbal medicine. To capture a wide range of perspectives relating to DNA barcode-based botanical identification, maximum variation sampling techniques were used in both plant parts and species distance. Twenty-four authenticated botanicals were sampled from different plant parts, covering both closely and distantly-related species, to validate the two-tiered DNA barcoding method by assessing method accuracy and precision.
Major steps involved in raw botanical identification using two-tiered DNA barcoding are described in
Two-tiered validation included a first tier and a second tier. rbcL and matK coding regions were used for the first tier. The second tier barcodes included non-coding regions ITS2, trnL-trnF, and psbA-trnH. Multiple barcodes were listed under each tier, but with priority ranked. Multiple barcodes were needed, because not all barcodes could be amplified in each botanical and certain barcodes could be masked by other organisms during storage, such as ITS2 contamination from fungus. To be consistent, close species differentiation was achieved by using the same barcode combination.
Validation was divided into two sections: barcode database validation (
Panax ginseng
Panax quinquefolius
Panax notoginseng
Angelica sinensis
Angelica archangelica
Angelica pubescens
Mentha piperita
Mentha canadensis
Camellia sinensis
Rosmarinus officinalis
Schisandra
Schisandra chinensis
Schisandra sphenanthera
Vaccinium myrtillus
Vaccinium corymbosum
Vaccinium macrocarpon
Matricaria recutita
Chamaemelum nobile
Tanacetum parthenium
Cinnamomum cassia
Cinnamomum zeylanicum
Morus alba
Ziziphus spinose
Ziziphus mauritiana
Paullinia cupana
In this example, only accuracy and precision were evaluated, as barcode-based identification is a categorical test. Accuracy was determined by the concordance between the test result and the genus and species provided by the specimen certificate of authenticity: Accuracy=(Number of concordant assessments)/(Number of all assessments)×100%. The acceptance criteria for accuracy should be at least at 95%.
Precision refers to the closeness of two or more measurements to each other. In this validation protocol, precision assesses the agreement between three individual tests when assigning species identities to 24 samples under testing. This measurement is also known as Fleiss' kappa. Acceptance Criteria: should be 0.90. Guidelines: almost perfect agreement (0.81-1.00).
Following validation of 72 samples, all 72 samples were assigned botanical scientific names that match their true identity: Accuracy=100% Precision=1.0. DNA concentrations of validation samples showed a bimodal distribution (
Setting the similarity cut-off value in
The disclosure is generally described herein using affirmative language to describe the numerous embodiments. The disclosure also includes embodiments in which subject matter is excluded, in full or in part, such as substances or materials, method steps and conditions, protocols, or procedures.
In at least some of the previously described embodiments, one or more elements used in an embodiment can interchangeably be used in another embodiment unless such a replacement is not technically feasible. It will be appreciated by those skilled in the art that various other omissions, additions and modifications may be made to the methods and structures described above without departing from the scope of the claimed subject matter. All such modifications and changes are intended to fall within the scope of the subject matter, as defined by the appended claims.
With respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity.
It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (for example, bodies of the appended claims) are generally intended as “open” terms (for example, the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to embodiments containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (for example, “a” and/or “an” should be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should be interpreted to mean at least the recited number (for example, the bare recitation of “two recitations,” without other modifiers, means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (for example, “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (for example, “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B.”
In addition, where features or aspects of the disclosure are described in terms of Markush groups, those skilled in the art will recognize that the disclosure is also thereby described in terms of any individual member or subgroup of members of the Markush group.
As will be understood by one skilled in the art, for any and all purposes, such as in terms of providing a written description, all ranges disclosed herein also encompass any and all possible sub-ranges and combinations of sub-ranges thereof. Any listed range can be easily recognized as sufficiently describing and enabling the same range being broken down into at least equal halves, thirds, quarters, fifths, tenths, etc. As a non-limiting example, each range discussed herein can be readily broken down into a lower third, middle third and upper third, etc. As will also be understood by one skilled in the art all language such as “up to,” “at least,” “greater than,” “less than,” and the like include the number recited and refer to ranges which can be subsequently broken down into sub-ranges as discussed above. Finally, as will be understood by one skilled in the art, a range includes each individual member. Thus, for example, a group having 1-3 articles refers to groups having 1, 2, or 3 articles. Similarly, a group having 1-5 articles refers to groups having 1, 2, 3, 4, or 5 articles, and so forth.
While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.
This application claims the benefit of priority to U.S. Provisional Application Nos. 62/538,423, filed Jul. 28, 2017, and 62/562,101, filed Sep. 22, 2017, the disclosures of which are hereby expressly incorporated by reference in their entireties.
| Number | Name | Date | Kind |
|---|---|---|---|
| 20030050470 | An | Mar 2003 | A1 |
| Number | Date | Country |
|---|---|---|
| WO 0236805 | May 2002 | WO |
| Entry |
|---|
| O'Malley, An adapter ligation-mediated PCR method for high-throughput mapping of T-DNA inserts in the Arabidopsis genome, Nature Protocols, 2, 2910-2917, 2007. (Year: 2007). |
| Ruzicka, Identification of Verbena officinalis Based on ITS Sequence Analysis and RAPD-Derived Molecular Markers, Planta Med, 75(11): 1271-1276, 2009. (Year: 2009). |
| Parkinson, Preparation of high-quality next-generation sequencing libraries from picogram quantities of target DNA, Genome Res., 22(1): 125-133, 2012. (Year: 2012). |
| Lowe, A computer program for selection of oligonucleotide primers for polymerase chain reactions, Nucleic Acids Research, 18(7): 1757-1761, 1990.I (Year: 1990). |
| Lo, Identification of constituent herbs in ginseng decoctions by DNA marker, Chin. Med., 10(1): 1-8, 2015. (Year: 2015). |
| Coregenomics, Troubleshooting DNA ligation in NGS library prep, 2015. (Year: 2015). |
| Little, DNA Barcode Authentication of Saw Palmetto Herbal Dietary Supplements, Sci Rep, 3, 3518, 2013. (Year: 2013). |
| Liu, LM-PCR Permits Highly Representative Whole Genome Amplification of DNA Isolated From Small Number of Cells and Paraffin-Embedded Tumor Tissue Sections, Diagn Mol Pathol, 13(2): 105-115, 2004. (Year: 2004). |
| Pirker, Whole Genome Amplification for CGH Analysis: Linker—Adapter PCR as the Method of Choice for Difficult and Limited Samples, Cytometry Part A, 61A:26-34, 2004. (Year: 2004). |
| Parveen, DNA Barcoding for the Identification of Botanicals in Herbal Medicine and Dietary Supplements: Strengths and Limitations , Planta Med, 82: 1225-1235, 2016. (Year: 2016). |
| Avula, et al. (2014). J Pharm Biomed Anal, 88, 278-288. |
| Bauer et al. (2004). Environmental biosafety research, 3(4), 215-223. |
| Calixto, J. (2000). Brazilian Journal of Medical and Biological Research, 33(2), 179-189. |
| CBOL Plant Working Group. PNAS 106(31), (2009), p. 12794-12797. |
| Chen, et al. (2010). Validation of the ITS2 region as a novel DNA barcode for identifying medicinal plant species. PLOS One, 5(1), e8613. |
| Cheng et al., “Biological ingredient analysis of traditional Chinese medicine preparation based on high-throughput sequencing: the story for Liuwei Dihuang Wan”, Scientific Reports, vol. 4, No. 1, Jun. 3, 2014 (Jun. 3, 2014), XP055541613. |
| Chiou et al: “Authentication of Medicinal Herbs using PCR-amplified ITS21 with Specific Primer s”, Planta Medica, Oct. 1, 2007 (Oct. 1, 2007), pp. 1421-1426, Retrieved from the Internet: URL: https://www.thieme-connect.de/products/ejournals/pdf/10.1055/s-2007-990227.pdf. |
| Chung et al: “The minimal amount of starting DNA for Agilent's hybrid capture-based targeted massively parallel sequencing”, Scientific Reports, vol. 6, No. 1, May 25, 2016 (May 25, 2016). |
| Cimino, M. T. (2010). Planta Med, 76(5), 495-497. |
| Gryson et al. (2002). Journal of the American Oil Chemists' Society, 79(2), 171. |
| Gryson, N. (2010). Anal Bioanal Chem, 396(6), 2003-2022. |
| Guan et al. (2013). Applied Biochemistry and Biotechnology, 169(2), 368-379. |
| Hellebrand et al. (1998). Zeitschrift für Lebensmitteluntersuchung und-Forschung A, 206(4), 237. |
| Henriques, et al. (2012). BMC Res Notes, 5, 637. |
| Heubl, G. (2010). Planta Med. 76(17), 1963-1974. |
| Ivanova et al.: “Authentication of Herbal Supplements Using Next-Generation Sequencing”, PLOS ONE, vol. 11, No. 5, May 26, 2016 (May 25, 2016), p. e0156426. |
| Kirsten et al: “The potential of three different PCR-related approaches for the authentication of mixtures of herbal substances and finished herbal medicinal products”, Phytomedicine, Elsevier, Amsterdam, NL, vol. 43 , Mar. 21, 2018 (Mar. 21, 2018) , pp. 60-67. |
| Little, D. P. (2014). Genome, 57(9), 513-516. |
| Mishra et al., “DNA barcoding: an efficient tool to overcome authentication challenges in the herbal market”, Plant Biotechnology Journal, vol. 14, No. 1, Jan. 1, 2016 (Jan. 1, 2016), pp. 8-21, XP055541607. |
| Morales, et al. (2009). Appl Environ Microbiol, 75(9), 2677-2683. |
| Newmaster et al. BMC medicine 11.1 (2013), p. 222. |
| Novak et al., “DNA-based authentication of plant extracts”, Food Research Internati, Elsevier, Amsterdam, Nl, vol. 40, No. 3, Jan. 23, 2007 (Jan. 23, 2007), pp. 388-392, XP005856108. |
| Parveen et al. (2016). Planta Medica, 82(14), 1225-1235. |
| Sagi, et al. (2014). J Sep Sci, 37(19), 2797-2804. |
| Sarma, N. (2015). DNA Testing of Herbal Supplements-Does it Work or Doesn't It ?. |
| Seguin-Orlando: “Ligation Bias in Illumina Next-Generation DNA Libraries: Implications for Sequencing Ancient Genomes”, Plos One, vol. 8, No. 10, Oct. 29, 2013 (Oct. 29, 2013), p. e78575. |
| Sgamma et al., “DNA barcoding for Industrial Quality Assurance”, Planta Medica, vol. 83, No. 14/15, Jun. 29, 2017 (Jun. 29, 2017), pp. 1117-1129, XP055523874. |
| Xanthopoulou et al., “Multiplex HRM analysis as a tool for rapid molecular authentication of nine herbal teas”, Food Control., vol. 60, Jul. 17, 2015 (Jul. 17, 2015), pp. 113-116, XP055540690. |
| Zheng et al., “A Comprehensive Quality Evaluation System for Complex Herbal Medicine Using PacBio Sequencing, PCR-Denaturing Gradient Gel Electrophoresis , and Several Chemical Approaches”, Frontiers in Plant Science, vol. 8, Sep. 13, 2017 (Sep. 13, 2017), XP055523876. |
| Partial Search Report issued in application No. PCT/US2018/044211, dated Nov. 29, 2018. |
| Search Report issued in application No. PCT/US2018/044211, dated Feb. 5, 2019. |
| O'Malley et al., An adapter ligation-mediated PCR method for high-throughput mapping of T-DNA inserts in the Arabidopsis genome, Nature Protocol 2:11, 2910-2917 (2007). |
| First Office Action in Chinese Patent Application No. 201880061546.4 dated Feb. 10, 2023, which is related to the present application. |
| Number | Date | Country | |
|---|---|---|---|
| 20190032153 A1 | Jan 2019 | US |
| Number | Date | Country | |
|---|---|---|---|
| 62562101 | Sep 2017 | US | |
| 62538423 | Jul 2017 | US |
