Patent Application
20230025663
This application is claims priority of Indian Application No. 202141031451, filed Jul. 13, 2021, the disclosure of which is incorporated by reference in its entirety.
The present invention is in the field of herbal nanoformulations, comprising two or more phytochemicals from turmeric.
Turmeric (Curcuma longa) has been used since ancient times as a condiment, preservative, flavouring and cooking agent and contains many bio active molecules that are responsible for the nutraceutical and therapeutic properties of turmeric.
The bioactive compounds of C. longa have antioxidant, antitumor, antimicrobial, insecticidal, larvicidal, insect repellent, anticancer, anti-inflammatory, anti-metastatic, anti-angiogenic, healing and gastro-protective properties.
Curcuminoids are the key ingredient of turmeric and include curcumin, demethoxycurcumin, and bisdemethoxycurcumin. The content of the curcuminoid complex in the turmeric rhizome is between 2.5 and 6% and the variation in content is due to variety, climate and cultivation methodologies.
Apart from curcumin, turmeric is also a source of a wide variety of phytochemicals, each having its own nutritive and medicinal value. Interestingly turmeric also contains water-soluble peptides and the most documented peptide is turmerin. This heat stable, noncyclic peptide constitutes 0.1% of the dry weight of turmeric and is insensitive to trypsin, pepsin, heat and ultra violet radiation. Turmerin could inhibit enzymes linked to type 2 diabetes and hence turmeric is good for diabetic patients. Turmerin is an efficient antioxidant, non-cytotoxic anti-mutagen, and protectant of DNA.
Even though turmeric has functional molecules of great health and medicinal significance, turmeric products fail to offer sufficient bioavailability in humans. The clinical development of curcumin has been limited by its virtual insolubility in water at acidic pH, rapid hydrolysis at alkaline pH, limited absorption, poor bioavailability, rapid metabolism, quick systemic elimination, poor pharmacokinetics, low stability and low penetration targeting efficacy. Because of its poor absorption efficiency, it is difficult for orally administered curcumin to attain blood levels sufficient to exert its bioactivities. For curcumin to exhibit its therapeutic effects in the human body, a person is required to swallow between 12 and 20 g of curcumin every day to achieve substantial concentration in the body after ingestion.
Numerous approaches have been used to improve the bioavailability of curcumin, including, the use of adjuvants like piperine, liposomal curcumin, curcumin nanoparticles, curcumin-phospholipid complex, etc.
Shoba et al., (1998) showed that the concomitant administration of piperine with curcumin resulted in an enhanced serum concentration, extent of absorption and bioavailability of curcumin in both rats and humans with no adverse effects.
Bhawana et al., (2011) prepared curcumin nanoparticles with higher aqueous solubility by spraying a solution of curcumin in dichloromethane into boiling water, drop-wise, at a flow-rate of 0.2 ml/min under ultrasonic conditions. It was found that both the choice of solvent and maintaining the drop flow were important parameters in obtaining the desired nanoparticles.
To enhance oral bioavailability of curcumin, Grill et al., (2014) formulated curcumin with naturally occurring UGT inhibitors (piperine, quercetin, tangeretin and silibinin) in a self-microemulsifying drug delivery system. The study indicates that of the four inhibitors examined in vivo, silibinin significantly improved Cmax and the overall bioavailability of curcumin.
Artiga-Artigas et al., (2018) assesses the influence of three molecularly different surfactants—lecithin, tween 20 and sucrose palmitate on the stability of curcumin loaded nanoemulsions and evaluates their influence on curcumin encapsulation and stabilization of curcumin-loaded nanoemulsions. The study concludes that nanoemulsions with 2.0% w/w lecithin did not suffer destabilization phenomena during almost 86 days of experiment, whereas those containing Tween 20 or SMP at the same concentrations were destabilized after 5 days or along 24 h, respectively.
Jayaprakasha et al., (2016) discloses the nanoencapsulation of curcumin with whey protein in different ratios to improve bioavailability and enhance its ability to prevent colon cancer.
Li et al., (2014) discloses preparation of nanoemulsion for water-insoluble curcumin stabilized by whey protein isolate. The results showed that nanoemulsions prepared using only whey protein isolate exhibited good stability over various ionic strengths, thermal treatments and upon storage.
WO201414585A1 discloses method for improving bioavailability of curcumin using milk protein concentrate, particularly, by using casein micelles.
WO2007110422A2 relates to whey protein micelles for delivery of active agents.
WO2015175573 A1 discloses curcumin-peptide conjugates for increasing the bioavailability of curcumin. In an embodiment, the complex is a curcumin-whey protein isolate complex.
WO 2010010431 discloses curcuminoid compositions comprising curcumin or curcuminoids, a lipidic carrier system with an HLB between 3 and 14, and a pH buffer, which forms a self nanoemulsion dilution with water, gastric fluid, or intestinal fluid of globule size of less than 200 nm.
Most of the formulations available in the market are primarily curcumin based and provide only partial benefits of turmeric to the consumers. But the profile of bioactive molecules in turmeric is highly promising and holds immense human health promoting potential. Therefore, it would be prudent to develop advanced nanoformulations, using a range of multi-functional bio active molecules from turmeric (such as, curcuminoids and peptides), which show high bioavailability upon oral administration. These multifunctional molecules exert additional health benefits compared to a formulation that contains only curcuminoids.
The present invention aims to develop encapsulated nanoparticles that have the goodness of curcuminoids and other bio actives from turmeric, such as peptides including turmerin. This is achieved by converting the functional molecules from turmeric into nanoparticles and encapsulating them using nanoglobulins in combination with surfactants/emulsifiers. Formulations containing nano sized, encapsulated functional molecules have the benefit of high bioavailability, which in the present invention has been further enhanced by incorporating plant alkaloid(s) and flavonoid(s) and volatiles in the process.
The present invention provides nanoformulations comprising two or more bioactive phytochemicals from turmeric and methods of producing the same. In particular, the present invention deals with nanoparticles and nanoformulations comprising functional molecules from turmeric, such as, curcuminoids and water-soluble peptides, including turmerin. The advanced nanoparticles and nanoformulations of the present invention provide health benefits from multiple biomolecules from turmeric while improving their bioavailability and ensuring stability of the formulations.
The present invention also relates to a novel process to prepare anionic nanoparticles and nano formulations according to the present invention using a cationic encapsulant.
It is an object of the present invention to provide nanoparticles and nanoformulations comprising two or more bioactive phytochemicals from turmeric while achieving significant stability and bioavailability of the phytochemicals. The nanoparticles and nanoformulations of the present invention achieve size reduction, encapsulation and enrichment of the phytochemicals with plant alkaloids, which bring out the true potential of said phytochemicals. The process of the present application helps to achieve nanoparticles and nanoformulations with reduced size, encapsulation and enrichment of the phytochemicals with plant alkaloids, which bring out the true potential of said phytochemicals.
The present invention provides nanoparticles and nanoformulations comprising two or more bioactive phytochemicals from turmeric. Nanoparticles with specific nanometric size, surface charge and stability are described. The nanoparticles comprise bioactive molecules from turmeric along with one or more substances selected from plant derived-alkaloids, plant derived-flavonoids and volatiles, and are encapsulated using globulins.
The bioactive phytochemicals from turmeric that can be incorporated into the nanoparticles of the present application include curcumin, demethoxycurcumin, bisdemethoxycurcumin, turmerin, turmerones, turmeronols, etc.
In a preferred embodiment, the bioactive phytochemicals from turmeric are curcumin or curcuminoids and water-soluble peptides, including turmerin. The rhizomes of turmerin are rich in phenolic compounds, curcumin, demethoxycurcumin, and bisdemethoxycurcumin, that are together known as curcuminoid. Most of the commercial curcuminoids, sold as “Curcumin” are mixtures of curcumin, demethoxycurcumin (DMC) and bisdemethoxycurcumin (BDMC).
The term water-soluble peptides, including turmerin as used in the present application is used to denote water-soluble peptides from turmeric, which include turmerin. Said water-soluble peptides are present in a water-soluble extract comprising turmerin, obtained from turmeric. Said water-soluble extract comprising turmerin can be obtained through several processes, including, for example, the process as described in the present application.
In a preferred embodiment of the invention, successful encapsulation of phytochemicals is achieved through the use of globulins from whey protein as encapsulant.
The surface active agents or surfactants are mono- or di-esters of saturated or unsaturated fatty acids comprising 6 to 24 carbon atoms. The surface active agents preferably have a hydrophilic-lipophilic balance (HLB) between 4 and 17.
In the context of the present application, the terms “surface active agents” and “surfactant” have been used interchangeably.
In preferred embodiments, the surfactant is selected from the group consisting of polyoxyethylene sorbitan oleate (Tween 80), polyoxyethylene sorbitan stearate (Tween 60), polyoxyethylene sorbitan palmitate (Tween 60), polyoxyethylene sorbitan laurate (Tween 20), sorbitan laurate (Span 20), sorbitan palmitate (Span 40), sorbitan stearate (Span 60), sorbitan oleate (Span 20), Cremophor RH 40 and mixtures thereof.
The interfacial activity of surface active agents used plays a critical role in the characteristics and stability of the nanoparticles and nanoformulations. Stability is achieved by altering the composition of the surface active agents (non-ionic lipophilic and hydrophilic surfactants) and a combination of hydrophilic and lipophilic surfactants with HLB values between 4 and 17 are used. In a preferred embodiment, nonionic lipophilic and hydrophilic surfactants of HLB values 15 and 4.3 are used to bring the HLB value of the formulation to a desired level. In more preferred embodiments, the surfactants of choice are polyoxyethylene sorbitan oleate (Tween 80) and sorbitan stearate (Span 60).
In a preferred embodiment, the nanoparticle and nanoformulation are anionic.
The choice of surface active agents is critical in preventing the aggregation of nano droplets into larger ones and the concentration of span, tween and whey protein plays an important role in preventing droplet growth and its gravitational separation.
The concentration and ratio of span, tween and whey protein are designed for higher formulation stability by preventing droplet growth and gravitational separation. Small portions of plant derived alkaloids and flavonoids (bioenhancers) like quercetin, capsaicin, naringin, piperine and resveratrol and biopolymers are added alone or in combination to overcome poor membrane permeation and pre-systemic metabolic degradation of bioactive molecules from turmeric. The type and concentration of bioenhancers is critical in enhancing bioavailability of the turmeric bioactives.
In a preferred embodiment, the plant derived alkaloid is capsaicin and/or piperine. In a further preferred embodiment, the plant derived flavonoid is quercetin. The concentration of plant based bioenhancers, such as, quercetin, capsaicin and piperine that enhances the bioavailability of phytochemicals, has also been identified.
In a preferred embodiment, the HLB value of the nanoparticle or nanoformulation is around 10.
The nanoparticle or nanoformulation of the present application can be used in the treatment of various diseases like cancer.
Embodiments of the present application also deal with pharmaceutical compositions comprising a nanoparticle or nanoformulation of the present application and a pharmaceutically acceptable carrier.
The present invention also relates to a novel process to produce anionic nanoparticles and formulations using a cationic encapsulant. The present invention discloses a combined process (methodology) using ultra sonication, nano wet milling and dry ball milling for converting the functional phytochemicals into the nano size with low-crystallinity.
In an embodiment, the process of the present application comprises:
In a preferred embodiment the process of the present applications comprises:
The ratio of the organic and aqueous phase is also critical for successful encapsulation. In a preferred embodiment, the ratio of the organic and aqueous phase is 1:4.
The encapsulant and surfactants have been selected and the process has been designed such that the signature functional groups of the phytochemicals from turmeric, are not affected as a result of the encapsulation.
In a preferred embodiment, the present invention relates to nanoparticles and nanoformulations of curcuminoids and water-soluble peptides. In a more preferred embodiment, the present invention relates to nanoparticles and nanoformulations of curcuminoids and water-soluble peptides, including turmerin. In a still more preferred embodiment, the present invention relates to nanoparticles and nanoformulations of curcumin and water-soluble peptides, including turmerin. In a preferred embodiment the nanoformulations of the present application are nanoemulsions. The nanoformulations of the present application can be administered orally, as a liquid or as tablets. The nanoformulations may also be encapsulated in a soft or hard gelatin capsule.
In a preferred embodiment, the multicomponent nanoparticles of the present application have a size range between 25-100 nm with an average size of 51 nm.
In a further preferred embodiment of the present invention, the multicomponent nanoparticles exhibit an anionic surface charge around neutral pH (pH 7).
In another embodiment, the present invention discloses a method of extracting a water-soluble extract from turmeric which comprises turmerin. The method comprises preparing an aqueous solution of turmeric by dissolving turmeric in water in a 1:8 (w/v) ratio. The resulting solution is subjected to ultrasonication. The ultrasonicated solution is then either subjected to centrifugation or filtration. The supernatant or filtrate is collected and the solvent is removed from the supernatant or filtrate using either a rotary evaporator or rotary vacuum paddle dryer.
The sample is then subjected to lyophilization.
Unmodified curcuminoids/curcumin in the context of the present application refers to curcuminoids/curcumin in their raw state which have not been reduced to nanometric size.
Multi-component nanoparticles, nanoparticles and nanoformulations in the context of the present invention refer to nanoparticles or nanoformulations which comprise more than one functional molecule from turmeric.
The nano-particles and nanoformulations of the present application have the following composition:
The following examples are for the purpose of illustration of the invention and are not intended in any way to limit the scope of the invention.
200 ml of ethyl acetate was taken in a jacketed vessel (1) with cooling facility. 4 g of sorbitan stearate (Span 60) was added to the vessel containing ethyl acetate and mixed using high shear disperser until a clear, homogenous solution was obtained. Further 3.8 g of curcuminoids were added to the solution and mixed thoroughly until a clear yellow solution was obtained. The curcumunoids used in the present application were procured from Dodla Natural Products, Chennai, India.
800 ml of demineralized water was taken in a jacketed vessel (2) and 6 g of polyoxyethylene sorbitan oleate (Tween 80) was added to it and mixed vigorously using a high shear disperser to form a milky solution. The solution was milky white in color owing to the presence of the surfactant.
5 g of whey protein concentrate and 8 g of water-soluble extract, which comprises turmerin, were added upon thorough dissolution of the surfactant, and the solution was mixed well until a yellow, milky solution was obtained following which, the bioenhancers, capsaicin and piperine were added at 1% and 1.3%, to the weight of the curcuminoids, respectively.
The water-soluble extract comprising turmerin was obtained by extraction from fresh turmeric powder by utilizing a green solvent and ultrasound assisted extraction (UAE). Ultrasound-assisted extraction works on the principle of acoustic or ultrasonic cavitation and hydrodynamic shear force. When cavitation bubbles implode on the surface of plant cells/tissues, inter particle collisions causes surface peeling, erosion, and particle breakdown. The intercellular materials are transferred into the solvent because of the mechanical effects of ultrasound-induced cavitation. These mechanical effects also enhance the mass transfer of bioactives between the cells and solvent.
To generate the water-soluble extract for use in the nanoformulations of the present application, 1 g of commercially available turmeric powder was added to 8 ml of distilled water (1:8 ratio of turmeric powder and distilled water) and mixed thoroughly. The resulting solution was subjected to ultrasonication for 30 minutes. Ultrasonication was conducted using the following parameters:
The extracted material was centrifuged at 10000 rpm for about 15 minutes. The supernatant was collected and transferred to a pear-shaped evaporating flask and the solvent was removed from the supernatant using a rotary evaporator at 65° C. for 1 hour. The samples were stored overnight at −80° C. and were then subjected to lyophilization under the following conditions.
In another experiment, the water-soluble extract for use in the nanoformulation of the present application, a 1:8 (w/v) solution of turmeric powder in distilled water (10 Kg turmeric in 80 L of distilled water) was subjected to ultrasonication for 120 minutes. The solution was then subjected to filtration using a sparkler filter or any other membrane filtration apparatus. The filtrate collected was placed in a Rotary Vacuum Paddle Dryer (RVPD) for removing the solvent. The RVPD was set for use at a vacuum of 560 mm of Hg, a temperature of 55° C. and the hot water tank temperature of 70° C. Finally, the material collected from RVPD was subjected to lyophilization.
The lyophilized water-soluble extracts gave spectral peaks at 3401 cm−1, 2930 cm−1, 1124 cm−1 1047 cm−1 and 685 cm−1 as shown in
A coarse nanoemulsion was prepared by adding 200 ml organic phase into 800 ml aqueous phase with continuous mixing. The organic phase can be added to the aqueous phase using a peristaltic pump. The total emulsion produced was subjected to ultrasonication in a jacketed vessel (4).
The nanoemulsion was further processed by wet grinding in a nanomiller (6) for size reduction. The nanoemulsion was subjected to two cycles of wet grinding for 20 minutes followed by 10 minutes. The nanoemulsion can be placed in a buffering tank both prior to and after nanomilling (5, 7). The volume of the nanoemulsion was reduced using Rotary Vacuum Paddle Dryer (RVPD) (8) operated at a temperature of 63° C. and vacuum of 650 mTorr. The slurry obtained using rotary vacuum paddle dryer was freeze dried (9) under the following temperature and vacuum cycle:
A powder form of the nanoemulsion was obtained using freeze-drying. The freeze-dried powder was processed in a ball miller (10) to form a fine, free-flowing powder which was then vacuum sealed (11).
The present nanoformulation has been designed to achieve an HLB value of around 10.0, which is desirable for an oil-in-water nano-emulsion.
The size of the samples was analyzed using Nano Particle Size Analyzer (Model: HORIBA-SZ-100). The size was measured based on the principle of dynamic light scattering.
The Polydispersity Index (PI) is a measure of heterogeneity in a sample based on size and PI values of less than 1 are preferred. The PI value obtained for the multicomponent nanoformulation of the present application was 0.425 indicating that the size distribution is homogenous.
Zeta Potential is the potential difference between the dispersion medium and the stationary layer of fluid attached to the particles. It is a characterization technique for estimating the surface charge of the particles and is used for attaining the right surface charge that can ensure physical stability of the nanosuspensions. The multicomponent nanoformulations of the present application were stable with a zeta potential of −49 mV while the zeta potential of unmodified curcuminoids was >−10 mV (
Even though the encapsulant (whey protein) used is positively charged, the anionic nature of the formulation is due to the influence of pH. The surface charge of whey protein in acidic pH is positive, while under alkaline pH it is negatively charged. As the nanoformulation of the present invention is around neutral pH, it is anionic in nature.
X-ray diffraction (XRD) is a technique used for analyzing the atomic or molecular structure of materials and in predicting the crystallinity of a sample. The health benefits of curcumin have not yet been realized due to its low bioavailability (˜1%) which in turn is due to its low water solubility, chemical instability and crystalline structure. Thus, the main objective of the present novel nanoformulation was to achieve low-crystallinity which can result in improved bio availability. The XRD patterns of unmodified curcuminoid powder exhibit a series of thin and intense lines, which are indicative of crystalline nature of the material. While the nanoparticles of the present application have similar peaks, the intensity of crystallinity is found to have been reduced (
Spectrometers can accurately distinguish and quantify radiation in the ultraviolet, visible, and near infrared regions of the spectrum. They work based on calorimetric principle and the absorbance of curcumin (yellow pigment) is usually observed between 420 nm to 435 nm. It is apparent from the results of ultraviolet visible spectrometry shown in
FTIR Spectroscopy characterization of curcuminoids
The main compounds contributing to the activities of C. longa Linn are curcuminoids, including curcumin, demethoxycurcumin and bis-demethoxycurcumin.
The infrared spectroscopy is measured between 4000 cm-1 to 400 cm-1. Infra-red active molecules have unique IR absorption spectra that may be used as a “fingerprint” for identification. Since each functional group absorbs a specific wavelength, no two unique molecules have the same absorption spectra Thus, this technique is utilized to identify the functional groups.
The major functional groups in curcumin are an α,β-unsaturated β-diketone moiety and an aromatic O-methoxy-phenolic group. The aromatic ring systems, which are phenols, are connected by two α,β-unsaturated carbonyl groups. The FTIR spectrum obtained confirms the presence of signature peaks in curcumin.
The FTIR spectra of unmodified curcuminoid samples and the multicomponent nanoparticles of the present application are provided in
The peak at 3283 cm-1 in both unmodified curcuminoid samples and the multicomponent nanoparticles of the present application corresponds to the phenolic O—H stretching vibration.
The bands at 2849 cm-1 observed in the multicomponent nanoparticles of the present application correspond to —CH2 group in the whey protein concentrate, that was used for encapsulation.
The peak at 1626 cm-1 in unmodified curcuminoid sample pertaining to the aromatic moiety C═C stretching has a mild shift at 1625 cm-1 in the multicomponent nanoparticles of the present application.
The benzene ring stretching vibrations in unmodified curcuminoid sample is at 1598 cm-1, whereas the same is shifted to 1580 cm-1 in the multicomponent nanoparticles of the present application. The shift is due to the bending of the benzene ring and the primary amine group of whey protein concentrate.
The peak, 1508 cm-1 in unmodified curcuminoid sample corresponds to the C═O vibrations whereas the same has a slight shift and is observed at 1513 cm-1. As the C═O bond overlaps the secondary amide group of protein in whey protein.
1428 cm-1 corresponds to olefinic C—H bending vibrations in unmodified curcuminoid sample which, in the multicomponent nanoparticles of the present application is at 1419 cm-1 with a minor shift that is due to the blending of C—C in whey protein concentrate and C—H bonding in curcumin.
1275 cm-1 in unmodified curcuminoid sample and 1268 cm-1 in the multicomponent nanoparticles of the present application corresponds to the aromatic C—O stretching vibrations respectively.
1020 cm-1 and 1030 cm-1 correspond to C—O—C stretching vibrations in unmodified curcuminoid sample and the multicomponent nanoparticles of the present application, respectively.
The similar spectral peaks in the multicomponent nanoformulations of the present application evidence that the signature functional groups of curcumin were not affected by encapsulation in the nanoparticles of the present application. The peaks at 1580 cm-1 and 1513 cm-1 show the interaction between the active compound, curcumin and the encapsulant, whey protein concentrate in the multicomponent nanoparticles and nanoformulations of the present application.
The FTIR spectra of the unmodified water-soluble extract comprising turmerin in comparison with the water-soluble extract comprising turmerin as present in the nanoformulations of the present application is shown in
In the unmodified water-soluble extract comprising turmerin, the stretching vibration of O—H creates a broad band at 3401 cm-1, showing the presence of flavonoids and other phenolic compounds. The specific band at 2930 cm-1 corresponds to aliphatic C—H stretching vibration. This band might represent glycosides, which are several forms of sugar molecules. The spectral peaks observed at 1124 cm-1 and 1047 cm-1 represents C—O stretching. The peak at 685 cm-1 probably due to the CH (OOP) bending. (
When the water-soluble extract comprising turmerin is impregnated in the nanoformulations, the peak locations of turmerin and shape showed a shift similar to that seen with the curcuminoids. The peaks of turmerin were shifted from 3401 cm-1 to 3419 cm-1, 1124 cm-1 to 1153 cm-1 and 1047 cm-1 to 1114 cm-1 after encapsulation into the nanoformulations of the present application. (
In this characterization experiment, the nanoformulations of the present application also show spectral peaks representative of curcuminoids at 1628 cm-1 which represents aromatic moiety C═C stretching, a peak at 1603 cm-1 which is due to the benzene ring stretching vibrations), a sharp peak at 1510 cm-1 which indicates the presence of C═0 and C═C vibrations, 1428 cm-1 which corresponds to olefin C—H bending vibrations and C—O—C stretching vibrations that generate the peak at 1024 cm-1. The intense peaks at 2917 cm-1 and 2849 cm-1 represent the phospholipids due to CH2 stretching vibration. (
Using analytical reagent (AR) grade curcuminoid (Sigma-Aldrich) as a blank, 200 ppm of curcuminoid solution was scanned in the UV-Visible spectroscopy range of 200 to 1100 nm. The maximum absorbance of curcuminoid was found at 404 nm.
The standard calibration curve of curcuminoids (
UV-Visible spectroscopy at an absorbance of 404 nm was used for evaluation of entrapment efficiency of curcuminoids in the nanoparticles or nanoformulations of the present application. The absorbance was measured at 404 nm after dilution and centrifugation with acetone.
1 mL of the nanoformulation of the present application was diluted with 9 mL of acetone and centrifuged for 30 minutes at 10000 rpm. The supernatant was then filtered through a 0.45 micron filter, and the absorbance of the filtrate was measured at 404 nm with acetone as a blank.
The concentration of curcuminoids was determined using the absorption data and the standard calibration curve of curcuminoids. Entrapment Efficiency (EE) was calculated according to the following formula:
The entrapment efficiency of curcuminoids in the multicomponent nanoparticles or nanoformulations of the present application was found to be 71.20%. The results showed that 178 ppm of curcuminoid was loaded in the nanoparticles and nanoformulations of the present application
In vitro release kinetics studies were carried out in accordance with the protocol of Asghar et al., 20171 with minor modifications. 10 ml of the present nanoformulation was transferred to a dialysis bag comprising dialysis membrane 60 (molecular weight cut off 12000 to 14000 KDa). The bag was sealed on both sides before being placed in a 1000 ml beaker containing 500 ml phosphate buffer (pH7.4) and was continuously stirred at 50 rpm. 3 ml of the release medium was withdrawn at regular intervals of 3 hours for 48 hours (0, 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48 hours) and equal amount of fresh buffer was added to maintain the sink conditions each time the release medium was withdrawn. The samples were analyzed using UV-Visible Spectroscopy at an absorbance of 404 nm.
The release data were fitted to zero order, first order and Korsmeyer-Peppas models to evaluate release mechanisms and kinetics. The results confirmed the controlled release of curcuminoids from the final nanoformulation. Controlled and sustained release of the active molecule is a prerequisite for higher bioavailability. In phosphate buffer, the release of curcuminoids was 25%. 49% and 82% at 12 hours, 24 hours and 48 hours, respectively.
The release of curcuminoid from the nanoformulation in phosphate buffer (pH 7.4) was fitted with zero order release model with R2 value of 0.96 (
From the foregoing table it is apparent that while unmodified curcuminoids show burst release, while the nanoformulations of the present application show controlled release of curcuminoids.
Cell line studies were carried out on SSC-25 cell line to confirm the efficacy of nanoformulated curcuminoids on proliferation and invasion of said cells. The Squamous Cell Carcinoma Cell lines “SSC-25” was obtained from ATCC (American Type Culture Collection), USA.
Oral Squamous Cell Carcinoma (OSCC) is the most frequent malignant tumour in the oral cavity and the survival rate is less than 50%.
The expression of Epidermal Growth Factor Receptor (EGFR) is increased during OSCC and is associated with tumor growth, invasion and metastasis. There are number of studies reported on the effect of curcumin on EGFR downstream signalling pathways. But the nanoformulation of the present application was found to have a greater impact on downregulation of EGFR.
The cells were treated with different concentrations of curcuminoid alone or the nanoformulation of the present application [(100 μg/L to 1000 μg/L) for 25 and 48 hours. The proliferation of SCC-25 cells was detected by MTT assay.
A dose dependent inhibition of cell proliferation was observed. An increased rate of inhibition of cancer cell proliferation was seen with increasing concentration of the nano-formulated curcuminoid. It can be seen from
As the nanoformulation had better effect on inhibition of SSC-25 cell proliferation, apoptosis studies were also conducted to prove the effect of the nanoformulation according to the present invention, on proliferation of healthy cells. No cell death was observed in healthy cells. Thus, the nanoformulation according to the present invention is safe to healthy cells.
Cell invasion is the spread of cancer cell to neighbouring cells, tissues and organs that may lead to secondary and tertiary cancer which accounts for higher mortality. A cell invasion assay was also performed using the nanoformulation of the present application. The nanoformulated curcuminoid according to the present invention evidently reduced the cell invasion in comparison with curcuminoid (alone) formulation. One of the reasons behind the inhibition of cell invasion could be the decreased activity of extracellular matrix metalloproteinases such as MMP-2 and MMP-9, which degrade most of extracellular matrix proteins during organogenesis and which play a key role in local tumor invasion.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202141031451 | Jul 2021 | IN | national |
