Patent Grant
11994504
Food safety is and will continue to be an important concern for most people. The globalizing nature of supply chains—including food and the chemical and biological inputs to food in addition to pathogens—means that it is ever more difficult to accurately ensure the safety of the food. Even in domestic supply chains, food moves rapidly from farm to table. The speed of movement coupled with the need to test for both legal inputs and pathogenic and chemical contamination creates a need for rapid testing throughout the food processing supply chain. Thus, there exists a need for rapid, efficient systems that can provide users with information pertaining to qualitative and quantitative data for a variety of biological and/or chemical components.
A portable interferometric system for detection and quantification of analyte within a food processing test sample composition is provided. The system includes an optical assembly unit, the optical assembly unit comprising a light unit and a detector unit each adapted to fit within a portable housing unit; and a cartridge system adapted to be inserted in the housing and removed after one or more uses, the cartridge system comprising an interferometric chip and a flow cell wafer. The interferometric chip includes one or more waveguide channels having a sensing layer thereon, the sensing layer adapted to bind or otherwise be selectively disturbed by one or more analytes within the animal health test sample composition.
According to one embodiment, the portable housing is sized and shaped to fit in a user's hand. According to one embodiment, the portable interferometric system further includes at least one display unit. According to one embodiment, the portable interferometric system further includes an external camera, the external camera adapted to capture a photo or video. According to one embodiment, the portable interferometric system includes an alignment means for aligning the cartridge system within a cartridge recess in the interferometric system. According to one embodiment, the sensing layer includes one or more antigens, antibodies, DNA microarrays, polypeptides, nucleic acids, carbohydrates, lipids, or molecularly imprinted polymers, or immunoglobulins suitable for binding one or more analytes within a food processing test sample composition. According to one embodiment, the portable interferometric system is configured to analyze the light signals from two or more waveguide channels to detect the presence of an analyte that individual waveguides channels could not have detected alone. According to one embodiment, the one or more waveguide flow channels each comprises a different sensitive layer to allow the system to detect different analytes on each waveguide flow channel. According to one embodiment, the sensitive layer is configured to bind one or more antibodies, virus antigens, virus proteins, bacteria, fungi, pathogen, RNA, chemical, mRNA or any combination thereof. According to one embodiment, the portable interferometric system exhibits an analyte detection limit down to about 1.0 picogram/L. According to one embodiment, the portable interferometric system exhibits an analyte detection limit down to about 1000 pfu/ml. According to one embodiment, the portable interferometric system exhibits sensitivity to at least 2 pixels per diffraction line pair. According to one embodiment, the portable interferometric system further includes a location means adapted to determine the physical location of the system. According to one embodiment, the analyte is one or more of 2,4-D (2,4-dichlorophenoxyacetic acid), dicamba (2-methoxy-3,6-dichlorobenzoic acid), butylated hydroxyanisole, butylated hydroxytoluene, recombinant bovine growth hormone, sodium aluminum sulfate, potassium aluminum, sulfate, bisphenol-A (BPA), sodium nitrite/nitrate, polycyclic aromatic hydrocarbons, heterocyclic amines, acrylamide, brominated vegetable oil, artificial food coloring/dyes, and dioxins.
A method of detecting and quantifying the level of analyte in a food processing test sample composition is provided. The method includes the steps of:
One or more aspects and embodiments may be incorporated in a different embodiment although not specifically described. That is, all aspects and embodiments can be combined in any way or combination. When referring to the compounds disclosed herein, the following terms have the following meanings unless indicated otherwise. The following definitions are meant to clarify, but not limit, the terms defined. If a particular term used herein is not specifically defined, such term should not be considered indefinite. Rather, terms are used within their accepted meanings.
As used herein, the term “portable” refers to the capability of the interferometric systems described herein to be transported or otherwise carried to a target sample location for use according the methods provided herein.
As used herein, the term “chemical” refers to a form of matter, natural or synthetic, having constant chemical composition.
As used herein, the term “food” refers to any nutritious substance that people or animals eat or drink or that plants absorb in order to maintain life and growth.
As used herein, the term “food processing” refers to any portion of the process of harvesting, manufacturing and distributing food to a human or other animal.
As used herein, the term “analyte” refers to a substance that is detected, identified, measured or any combination thereof by the systems provided herein. The analyte includes any solid, liquid, or gas affecting (positively or negatively) an environment of interest. The analyte can be beneficial or deleterious. The analyte includes, but is not limited to, chemicals as well as bacteria and other pathogenic microorganisms in a food processing environment. The analyte includes, but is not limited to microbes (beneficial or pathogenic that may be dead or alive), biomarkers, RNA, DNA, pathogen, antigen or portion thereof, antibody, virus, metabolite generated as a reaction to disease or infection, or viral protein. A chemical analyte may include any pesticides, herbicides (e.g., fluridone), insecticides, plant growth regulators, biocides, nutrients, polychlorinated biphenyls (PCB), volatile organic compounds (e.g., benzene, toluene, ethylbenzene and xylenes), tetrachloroethylene (PCE), trichloroethylene (TCE), and vinyl chloride (VC)), gasoline, oil, nitrites, or metals. Specific analytes within the food processing environment include 2,4-D (2,4-dichlorophenoxyacetic acid), dicamba (2-methoxy-3,6-dichlorobenzoic acid), butylated hydroxyanisole, butylated hydroxytoluene, recombinant bovine growth hormone, sodium aluminum sulfate, potassium aluminum, sulfate, bisphenol-A (BPA), sodium nitrite/nitrate, polycyclic aromatic hydrocarbons, heterocyclic amines, acrylamide, brominated vegetable oil, artificial food coloring/dyes, and dioxins.
As used herein, the term “pathogen,” “pathological,” “pathological contaminant” and “pathological organism” refer to any toxin (e.g., algal toxin), chemical, bacterium, virus or other microorganism (fungi, protozoa, etc.) that can cause disease for a member of the plant or animal kingdom in a food processing environment.
As used herein, the terms “sample” and “target sample” all refer to any substance that may be subject to the methods and systems provided herein. Particularly, these terms refer to any matter (animate or inanimate) where an analyte may be present and capable of being detected, quantified, monitored or a combination thereof. Suitable examples of targets include, but are not limited to, any animate or inanimate surface, soil, food, ambient air, soil, or runoff from a(n): (i) agricultural field; (ii) coop; (iii) barn; (iv) pasture (iv) feedlot; (v) or animal holding facility. Targets also include air, surfaces, fluids and mixtures thereof in or from food processing facilities, laboratories, greenhouses, pastures, crop fields, crop spray tanks, crop sprayers, and crop applicators. The target also encompasses exhaled breath.
As used herein, the term “point of use” refers to the applicability of the systems provided herein to be utilized by a user at or within a food processing environment.
“Optional” or “optionally” means that the subsequently described event or circumstance may or may not occur, and that the description includes instances where said event or circumstance occurs and instances where it does not.
As used herein, the term “buffer” refers to a carrier that is mixed with the target sample that includes at least one analyte.
As used herein, the term “test sample composition” refers to the combination of at least one buffer and target sample.
As used herein, the term “food processing test sample composition” refers to the combination of at least one buffer and target sample taken from an environment wherein a chemical analyte is located.
As used herein, the term “food processing environment” refers to a location where target sample is located including, but not limited to, any animate or inanimate surface, ambient air, or chemical from a food processing facility.
As used herein, the term “communication” refers to the movement of air, liquid, mist, fog, buffer, test sample composition, or other suitable source capable of carrying an analyte throughout or within the cartridge system. The term “communication” may also refer to the movement of electronic signals between components both internal and external to the cartridge systems described herein.
As used herein, the term “single-use” refers to the cartridge system being utilized in an interferometric system for a single test or assay before disposal (i.e., not re-used or used for a second time).
As used herein, the term “multiple-use” refers to the cartridge system being utilized for more than one test sample composition (e.g., assay) before disposal.
As used herein, the term “multiplex” refers to the cartridge system being utilized to detect multiple analytes from one target sample composition.
Optical Interferometry Principles
The systems provided include a detector that operates via ultrasensitive, optical waveguide interferometry. The waveguiding and the interferometry techniques are combined to detect, monitor and even measure small changes that occur in an optical beam along a propagation pathway. These changes can result from changes in the length of the beam's path, a change in the wavelength of the light, a change in the refractive index of the media the beam is traveling through, or any combination of these, as shown in Equation 1.
According to Equation 1, φ is the phase change, which is directly proportional to the path length, L, and refractive index, n, and inversely proportional to the wavelength (λ) change. According to the systems and methods provided herein, the change in refractive index is used. Optical waveguides are utilized as efficient sensors for detection of refractive index change by probing near the surface region of the sample with an evanescent field. Particularly, the systems provided herein can detect small changes in an interference pattern.
According to one embodiment, the waveguide and interferometer act independently or in tandem to focus an interferometric diffraction pattern. According to one embodiment, the waveguide, interferometer, and sensor act independently or two parts in tandem, or collectively to focus an interferometric pattern with or without mirrors or other reflective or focal median. According to one embodiment, the waveguide and interferometer exhibit a coupling angle such that focus is at an optimum angle to allow the system to be compact and suited to be portable and hand-held.
Interferometric System Overview
The interferometric systems as provided herein are mobile (hand-held) and portable for ease of use in various environments. The interferometric systems include a weight and overall dimensions such that user may hold the entire interferometric system comfortably in one hand. According to one embodiment, the entire interferometric system is under three pounds. Thus, the present disclosure provides a lightweight, handheld and easy-to-use interferometric system that can rapidly, precisely, and accurately provide detection and quantification of analytes in a variety of environments.
The systems as provided herein provide a high throughput modular design. The systems as provided herein may provide both qualitative and quantitative results from one or more analytes within a test sample composition. Particularly, the systems as provided herein may simultaneously provide detection and quantification of one or more analytes from a target sample. According to one embodiment, both qualitative and quantitative results are provided in real-time or near real time.
The interferometric systems provided herein generally include a housing for various detection, analysis and display components. The interferometric system housing includes a rugged, stable, shell or case. The interferometric system housing can withstand hazards of use and cleaning or disinfection procedures of the case surface. The interferometric system housing may be manufactured from a polymer via various techniques such as injection molding or 3D printing. The interferometric system housing may be manufactured to include a coloration that provides the interferometric system housing with a particular color or color scheme.
According to one embodiment, the interferometric systems provided herein include components that are sealed, waterproof or water resistant to the outside environment to minimize opportunities for contamination of a target sample. The overall arrangement of components within the interferometric systems minimize harboring of contamination in any hard-to-reach areas allowing for ease of disinfection.
The interferometric systems provided herein include a cartridge system. The cartridge systems provided herein integrate with one or more independent or integrated optical waveguide interferometers. The cartridge systems provide efficient sample composition communication through a microfluidic system mounted on or within the cartridge housing. The cartridge is suitable for one or more analytes to be detected in a single sample in a concurrent, simultaneous, sequential or parallel manner. The cartridge systems provided herein may be utilized to analyze in a multiplex manner. That is, one test sample composition will be tested to determine the presence of multiple analytes at the same time by utilizing a plurality of waveguide channels that interact with the test sample composition.
The cartridge systems provided herein are easily removable and disposable allowing for overall quick and efficient use without the risk of cross-contamination from a previous target sample. The cartridge may be safely disposed of after a single use. Disposal after a single use may reduce or eliminate user exposure to biological hazards. According to one embodiment, the cartridge system includes materials that are biodegradable, or recycled materials, to reduce environmental impact. The cartridge system may be cleaned and re-used or otherwise recycled after a single use.
The cartridge system as provided herein may be suited for multiple or one-time use. The single-use cartridge system may be manufactured in a manner such that a buffer solution is pre-loaded in the microfluidic system. By providing the buffer solution pre-loaded in the single-use cartridge system, gas bubbles are reduced or otherwise eliminated. After a single use, the entire cartridge system is safely discarded or recycled for later use after cleaning. Put another way, after introduction and detection of a test sample composition, the entire single-use cartridge system is not used again and, instead, discarded.
The cartridge systems as provided herein may be suited for multiple uses. According to such an embodiment, the cartridge system may be used one or more times prior to the cartridge system being safely discarded or recycled. The cartridge system may also be cleaned and re-used or otherwise recycled after multiple uses. According to one embodiment, the cartridge system facilitates cleaning and re-tooling to allow the cartridge system to be replenished and returned to operation.
According to one embodiment, the interferometric systems as provided herein have an analyte detection limit down to about 10 picogram/ml. According to one embodiment, the systems as provided herein have an analyte detection limit down to about 1.0 picogram/ml. According to one embodiment, the systems as provided herein have an analyte detection limit down to about 0.1 picogram/ml. According to one embodiment, the systems as provided herein have an analyte detection limit down to about 0.01 picogram/ml.
According to one embodiment, the interferometric systems as provided herein have an analyte detection limit down to about 3000 plaque forming units per milliliter (pfu/ml). According to one embodiment, the systems as provided herein have an analyte detection limit down to about 2000 pfu/ml. According to one embodiment, the systems as provided herein have an analyte detection limit down to about 1000 pfu/ml. According to one embodiment, the systems as provided herein have an analyte detection limit down to about 500 plaque forming units per milliliter (pfu/ml). According to one embodiment, the systems as provided herein have an analyte detection limit down to about 100 plaque forming units per milliliter (pfu/ml). According to one embodiment, the systems as provided herein have an analyte detection limit down to about 10 plaque forming units per milliliter (pfu/ml). According to one embodiment, the systems as provided herein have an analyte detection limit down to about 1 plaque forming units per milliliter (pfu/ml). According to one embodiment, the systems as provided herein have an analyte detection limit to about 1 plaque forming units per liter (pfu/l).
According to one embodiment, the interferometric systems provided herein provide both qualitative and quantitative results at or under 60 minutes after sample introduction to the system. According to one embodiment, both qualitative and quantitative results are provided at or under 30 minutes. According to one embodiment, both qualitative and quantitative results are provided at or under 10 minutes. According to one embodiment, both qualitative and quantitative results are provided at or under 5 minutes. According to one embodiment, both qualitative and quantitative results are provided at or under 2 minutes. According to one embodiment, both qualitative and quantitative results are provided at or under 1 minute.
The interferometric systems as provided herein may be powered via alternating current or direct current. The direct current may be provided by a battery such as, for example, one or more lithium or alkaline batteries. The alternating or direct current may be provided by alternative energy sources such as wind or solar.
According to one embodiment, the interferometric system is stabilized to address vibrational distortions. The system may be stabilized by various means including mechanical, chemically (fluid float or gel pack), computer-assisted system (electronically), or digitally (e.g., via a camera). In some implementations, the systems provided herein allow for point of use assays that are stable in various conditions, including ambient temperature and humidity as well as extreme heat, cold and humidity.
The interferometric systems as provided herein may be equipped with one or more software packages loaded within. The software may be electronically connected to the various system components as provided herein. The software may also be electronically integrated with a display for viewing by a user. The display may be any variety of display types such as, for example, a LED-backlit LCD. The system may further include a video display unit, such as a liquid crystal display (“LCD”), an organic light emitting diode (“OLED”), a flat panel display, a solid state display, or a cathode ray tube (“CRT”).
According to one embodiment, the interferometric system as provided herein may interface with or otherwise communicate with a transmission component. The transmission component may be in electronic signal communication with both the cartridge system and interferometric system components. The transmission component sends or transmits a signal regarding analyte detection data and quantification data. The transmission of such data may include real-time transmission via any of a number of known communication channels, including packet data networks and in any of a number of forms, including instant message, notifications, emails or texts. Such real-time transmission may be sent to a remote destination via a wireless signal. The wireless signal may travel via access to the Internet via a surrounding Wi-Fi network. The wireless signal may also communicate with a remote destination via Bluetooth or other radio frequency transmission. The remote destination may be a smart phone, pad, computer, cloud device, or server. The server may store any data for further analysis and later retrieval. The server may analyze any incoming data using artificial intelligence learning algorithms or specialized pathological, physical, or quantum mechanical expertise programed into the server and transmit a signal.
According to one embodiment, the transmission component may include a wireless data link to a phone line. Alternatively, a wireless data link to a building Local Area Network may be used. The system may also be linked to Telephone Base Unit (TBU) which is designed to physically connect to a phone jack and to provide 900 MHz wireless communications thereby allowing the system to communicate at any time the phone line is available.
According to one embodiment, the interferometric system may include a location means. Such a location means includes one or more geolocation device that records and transmits information regarding location. The location means may be in communication with a server, either from a GPS sensor included in the system or a GPS software function capable of generating the location of the system in cooperation with a cellular or other communication network in communication with the system. According to a particular embodiment, the location means such as a geolocation device (such as GPS) may be utilized from within its own device or from a mobile phone or similarly collocated device or network to determine the physical location of the cartridge system.
According to one embodiment, the interferometric system contains a geo-location capability that is activated when a sample is analyzed to “geo-stamp” the sample results for archival purposes. According to one embodiment, the interferometric system contains a time and date capability that is activated when a sample is analyzed to time stamp the sample results for archival purposes.
The interferometric systems provided herein may interface with software that can process the signals hitting the detector unit. The cartridge system as provided herein may include a storage means for storing data. The storage means is located on or within the cartridge housing or within the interferometric system housing. The storage means communicates directly with electronic components of the interferometric system. The storage means is readable by the interferometric system. Data may be stored as a visible code or an index number for later retrieval by a centralized database allowing for updates to the data to be delivered after the manufacture of the cartridge system. The storage means may include memory configured to store data provided herein.
The data retained in the storage means may relate to a variety items useful in the function of the interferometric system. According to a particular embodiment, the data may provide the overall interferometric system or cartridge system status such as whether the cartridge system was previously used or is entirely new or un-used. According to a particular embodiment, the data may provide a cartridge system or interferometric system identification. Such an identification may include any series of letter, numbers, or a combination thereof. Such identification may be readable through a QR code. The identification may be alternatively memorialized on a sticker located on the cartridge housing or interferometric system housing. According to one embodiment, the cartridge housing contains a bar code or QR code. According to one embodiment, the cartridge system contains a bar code or QR code for calibration or alignment. According to one embodiment, the cartridge system contains a bar code or QR code for identification of the cartridge or test assay to be performed. According to one embodiment, the cartridge system contains a bar code or QR code for identification of the owner and location of where any data generated should be transmitted. A user may scan such a QR code with the interferometric system's external camera prior to use to use of the system such that identification and transmission may occur (e.g., automatically or upon user direction).
According to a particular embodiment, the data retained in the storage means may provide the number of uses remaining for a multiple-use cartridge system. According to a particular embodiment, the data may provide calibration data required by interferometric system to process any raw data into interpretable results. According to a particular embodiment, such data may relate to information about the analyte and any special processing instructions that can be utilized by the cartridge system to customize the procedure for the specific combination of receptive surface(s) and analyte(s). The interferometric system as provided herein may include electronic memory to store data via a code or an index number for later retrieval by a centralized database allowing for updates to the data to be delivered after the manufacture of the cartridge system.
The interferometric system may include a memory component such that operating instructions for the interferometric system may be stored. All data may be stored or archived for later retrieval or downloading onto a workstation, pad, smartphone or other device. According to one embodiment, any data obtained from the system provided herein may be submitted wirelessly to a remote server. The interferometric system may include logic stored in local memory to interpret the raw data and findings directly, or the system may communicate over a network with a remotely located server to transfer the raw data or findings and request interpretation by logic located at the server. The interferometric system may be configured to translate information into electrical signals or data in a predetermined format and to transmit the electrical signals or data over a wireless (e.g., Bluetooth) or wired connection within the system or to a separate mobile device. The interferometric system may perform some or all of any data adjustment necessary, for example adjustments to the sensed information based on analyte type or age, or may simply pass the data on for transmission to a separate device for display or further processing.
The interferometric systems provided herein may include a processor, such as a central processing unit (“CPU”), a graphics processing unit (“GPU”), or both. Moreover, the system can include a main memory and a static memory that can communicate with each other via a bus. Additionally, the system may include one or more input devices, such as a keyboard, touchpad, tactile button pad, scanner, digital camera or audio input device, and a cursor control device such as a mouse. The system can include a signal generation device, such as a speaker or remote control, and a network interface device.
According to one embodiment, the interferometric system may include color indication means to provide a visible color change to identify a particular analyte. According to one embodiment, the system may include a reference component that provides secondary confirmation that the system is working properly. Such secondary confirmation may include a visual confirmation or analyte reference that is detected and measured by the detector.
The interferometric system as provided herein may also include a transmitting component. The transmitting component may be in electronic signal communication with the detector component. The transmitting component sends or transmits a signal regarding analyte detection and quantification data. The transmission of such data may include real-time transmission via any of a number of known communication channels, including packet data networks and in any of a number of forms, including text messages, email, and so forth. Such real-time transmission may be sent to a remote destination via a wireless signal. The wireless signal may travel via access to the Internet via a surrounding Wi-Fi network. The wireless signal may also communicate with a remote destination via Bluetooth or other radio frequency transmission. The remote destination may be a smart phone, pad, computer, cloud device, or server. The server may store any data for further analysis and later retrieval. The server may analyze any incoming data using artificial intelligence learning algorithms or specialized pathological, physical, or quantum mechanical expertise programed into the server and transmit a signal.
According to one embodiment, the interferometric system includes a wireless data link to a phone line. Alternatively, a wireless data link to a building Local Area Network may be used. The system may also be linked to Telephone Base Unit (TBU) which is designed to physically connect to a phone jack and to provide 900 MHz wireless communications thereby allowing the system to communicate at any time the phone line is available.
According to one embodiment, the system may also include geolocation information in its communications with the server, either from a GPS sensor included in the system or a GPS software function capable of generating the location of the system in cooperation with a cellular or other communication network in communication with the system. According to a particular embodiment, the system may include a geolocation device (such as GPS or RFID) either from within its own device or from a mobile phone or similarly collocated device or network to determine the physical location of the system.
According to one embodiment, the interferometric system includes an external camera. The external camera may be at least partially located within the interferometric system housing but include a lens exposed to the exterior of the housing such that the external camera may take photos and video of a target sample prior to collection (e.g., soil, plant, etc.). The external camera may capture video or images that aid in the identification of an analyte and confirmation of the resulting data. The external camera may also capture video images that aid in selecting a proper remedial measure. The external camera may capture video or images that aid in the identification of a target sample or source thereof.
The external camera may capture video or images in connection with scanning and identifying a QR code (such as a QR code on an external surface of a cartridge housing). When located on an external surface of the cartridge housing, the QR code may also aid in identifying ownership of generated data and transmission of such data to a correct owner.
According to one embodiment, the cartridge system contains a geo-location capability that is activated when a sample is analyzed to “geo-stamp” the sample results for archival purposes. According to one embodiment, the cartridge system contains a time and date capability that is activated when a sample is analyzed to time stamp the sample results for archival purposes. According to one embodiment, the cartridge system includes materials that are biodegradable, or recycled materials, to reduce environmental impact. Any used cartridge system provided herein may be disposed of in any acceptable manner such as via a standard biohazard container. According to one embodiment, the cartridge system facilitates cleaning and re-tooling to allow the cartridge system to be replenished and returned to operation.
According to one embodiment, the cartridge system is stabilized to address vibrational distortions. The system may be stabilized by various stabilization means including mechanical (alignment means as provided herein), chemically (fluid float or gel pack), computer-assisted system (electronically), or digitally (e.g., via a camera or digital processing).
Microfluidic System Overview—Single-Use Cartridge System
The single-use cartridge system provided herein includes a microfluidic system for communicating or otherwise providing a means for test sample and buffer to mix thereby resulting in a test sample composition. The microfluidic system causes the test sample composition move through the detection region to allow for detection and analysis of one or more analytes. The microfluidic system includes an injection port for introduction of a test sample. The injection port may optionally include a check valve. The microfluidic system further includes a first microchannel section having a first end attached in communication with the injection port check valve and a second end in communication with a mixing bladder. According to one embodiment, the first microchannel section contains a filter to remove materials not capable of detection and quantification. The mixing bladder is sized, shaped and otherwise configured to store buffer. The mixing bladder is sized, shaped and otherwise configured to aid in mixing buffer and test sample to form the test sample composition. The mixing bladder may be bypassed such that the test sample composition may be automatically discharged or allowed to proceed through the microfluidic system. The mixing bladder may include a temperature control means in the form of a metal coil wrapped around the mixing bladder such that the temperature control means is heated upon introduction of an electric current.
The microfluidic system further includes second microchannel section having a first end attached in communication with the mixing bladder and a second end attached in communication with a flow cell having at least one detection microchannel. By including multiple two or more detection microchannels, the cartridge system is particularly suited for high throughput and improved testing efficiency by being able to detect and quantify analyte in more than one test sample composition.
The microfluidic system further includes at least one pump. Suitable pumps include micropumps such as, but are not limited to, diaphragm, piezoelectric, peristaltic, valveless, capillary, chemically-powered, or light-powered micropumps. According to an alternative embodiment, the microfluidic system further includes at least one pump that is a, positive-displacement pump, impulse pump, velocity pump, gravity pump, steam pump, or valve-less pump of any appropriate size. According to a single-use embodiment of the cartridge system, the cartridge system contains at least one pump located within the cartridge housing. According to one embodiment of a single-use cartridge system, the pump overlays or otherwise engages or touches the first microchannel section, second microchannel section and mixing bladder.
The microfluidic system of the single-use cartridge system as provided herein may be manufactured and packaged under negative pressure or vacuum sealed. In this manner, the negative pressure allows for a test sample to be pulled in and become self-loading upon introduction of the test sample. The negative pressure further allows for a test sample to be pulled in in the microfluidic system to reduce, avoid or eliminate bubble formation upon introduction of the test sample. According to an alternative embodiment, the microfluidic system is manufactured and packaged under a positive pressure. According to either embodiment, the microfluidic system of a single-use cartridge system may be pre-loaded with a buffer solution at the time of manufacture. The buffer may be custom designed or designated for a particular analyte detection. Buffer solution that is used (i.e., buffer waste) and resulting test sample composition waste may be contained permanently in the single-use cartridge system.
According to one embodiment, the pump can be powered by a battery or electricity transferred from the testing device. Alternatively, the energy to power the pump can be mechanically transferred by direct force, electromagnetic induction, magnetic attraction, audio waves, or piezo electric transfer. According to one embodiment, the cartridge system includes at least one pulse dampening component such as a regulator or accumulator or bladder.
Microfluidic System Overview—Multiple-Use Cartridge System
The multiple-use cartridge system provided herein includes a microfluidic system for communicating or otherwise providing a means for a test sample composition to move through the cartridge system and allow for detection and analysis of one or more analytes. According to a particular embodiment, the test sample and test sample composition are air or liquid. An ingress port is located on a front surface of the multiple-use cartridge system. The ingress port is in communication with a first microchannel section having a first end attached in communication with an ingress port check valve and a second end in communication with second microchannel section. A filter may be located anywhere within the first microchannel section.
The second microchannel section includes a first end in communication the first microchannel section and a second end in communication with a flow cell having at least one detection microchannel. The cartridge system includes a detection region that accommodates or is otherwise adapted to receive the chip and flow cell wafer.
The detection microchannel is in communication with a first end of a third microchannel section. The third microchannel section includes a flow electrode to approximate flow rate and is correlated with measured impedance. The third microchannel section includes a second end in communication with the first end of a fourth microchannel. The fourth microchannel includes a second end in communication with a check valve which, in turn, is in communication with an egress port. The chip utilized in the multiple-use embodiment may be removable from the cartridge system.
The microfluidic system further includes at least one pump. Suitable pumps include micropumps that include, but are not limited to, diaphragm, piezoelectric, peristaltic, valveless, capillary, chemically-powered, or light-powered micropumps. According to an alternative embodiment, the microfluidic system further includes at least one pump that is a positive-displacement pump, impulse pump, velocity pump, gravity pump, steam pump, or valve-less pump of any appropriate size. According to one multiple-use embodiment of the cartridge system, the cartridge system contains at least one pump located outside (external to) the cartridge housing but in communication with the microfluidic system. The external pump may be utilized to move test sample composition through the microfluidic system to aid in removal of air or bubble that may be present in a liquid test sample composition prior to use. According to one embodiment, the cartridge system contains at least one pump dampening device.
All of the cartridge systems provided herein may utilize the pump to manipulate the communication of test sample composition throughout the microfluidic system. According to one embodiment, the pump causes or otherwise aids movement of test sample composition through the microchannels as well as the mixing bladder, when present.
Handheld Interferometric System—Exemplary Embodiment
Chip Overview
As previously noted, the cartridge systems provided herein further includes a detection region. This detection region accommodates or is otherwise adapted to receive an interferometric chip and flow cell wafer. The flow cell wafer includes at least one detection microchannel. The flow cell wafer is located directly above the chip. The detection microchannel may be etched onto a flow cell wafer having a substantially transparent or clear panel or window. The detection microchannel aligns with each waveguide channel in the chip.
In use, a light signal may be emitted from a light unit located in the interferometric system. The light enters flow through entry gradients in the chip and through one or more waveguide channels. According to a particular embodiment, there may be two or more waveguides channels to determine the presence of a separate analyte that each of the individual waveguides channels alone would not have been able to identify alone. The evanescent field is created when the light illuminates the waveguide channel. The light signal is then directed by exit gradients to a detector unit such as a camera unit. The detector unit is configured to receive the light signal and detect an analyte present in a test sample composition. The chip may further include a reference waveguide channel.
A sensing layer is adhered to a top side of one or more waveguide channels. According to a particular embodiment, the sensing layer may include one or more antigens or antibodies that are immobilized on the waveguide channel surface to sense the antigen-specific antibody or antigen, respectively. According to another embodiment, the sensing layer may include envelope, membrane, nucleocapsid N-proteins or different domains of one of the proteins in a natural or artificial virus used to delivery interfering RNA (RNAi) as a treatment.
According to a particular embodiment, the sensing layer may include a molecularly imprinted polymer. The molecularly imprinted polymer leaves cavities in the polymer matrix with an affinity for a particular analyte such as an antibiotic.
According to a particular embodiment, the sensing layer may include a DNA microarray of DNA probes. Each probe may be specific for a pathogen (i.e., bacterial species) and when the probe hybridizes with a sample, the sample/probe complex fluoresces in UV light or may be detected via interferometric analysis.
According to one embodiment, the sensing layer may utilize immunoassays on top of the waveguide channels for detection of one or more analytes. According to one embodiment, the system may include, or function based on, an enzyme-linked immunosorbent assay (ELISA) or other ligand binding assays that detect analytes in target samples. According to one embodiment, the sensing layer may utilize one or more polypeptides, nucleic acids, antibodies, carbohydrates, lipids, receptors, or ligands of receptors, fragments thereof, and combinations thereof. According to one such embodiment, the sensing layer is configured to include one or more antibodies as well as one or more immunoglobulins to aid in the indication of the stage of analyte infection. Suitable immunoglobulins include IgG, IgM, IgA, IgE and IgD.
Flow Cell Overview
Each of the cartridge systems described herein include a flow cell having at least one detection microchannel adapted to communicate with one or more test sample compositions flowing through a waveguide channel in a chip beneath the flow cell. According to one embodiment, the cartridge systems may include at least two, at least three, or at least four detection microchannels with each detection microchannel adapted to communicate one or more test sample composition allowing detection of the same or different analytes.
Each detection microchannel is located on or within a flow cell manufactured from a wafer. The at least one detection microchannel may be etched, molded or otherwise engraved into one side of the flow cell wafer. Thus, the at least one detection microchannel may be shaped as a concave path as a result of the etching or molding within the flow cell wafer.
The flow cell wafer is oriented above the chip during use such that the detection microchannel may be orientated or otherwise laid out in variety of flow patterns above the waveguide channels. The detection microchannel may be laid out, for example, in a simple half loop flow pattern, serial flow pattern, or in a serpentine flow pattern. The serpentine flow pattern is particularly suited for embodiments where there are multiple waveguide channels that are arranged in a parallel arrangement. By utilizing the serpentine flow pattern, the test composition flows consistently over the waveguide channels without varying flow dynamics.
Chip, Flow Cell and Optical Assembly—Exemplary Embodiment
A bottom view of an exemplary flow cell 300 is illustrated in
The movement of an light signal 308 (series of arrows) through a chip 310 is illustrated in
According to a particular embodiment, the two or more waveguides channels 316 are utilized that are able to determine the presence of an analyte that each of the individual waveguides channels 316 alone would not have been able to identify alone. The light signal 308 is then directed by exit gradients 318 to a detector unit 320 such as a camera unit. The detector unit 320 is configured to receive the light signal 308 and detect any analyte present in a target sample composition flowing through the detection microchannel 302 (see
The chip 310 includes a combination of substrate 202 (see
The light signal passes through each waveguide channel as illustrated in
A complimentary communication means 424 extends downward so as to make electronic contact with electronic communications means located on the cartridge housing (see
At least one downward cantilever bias spring 426 may be located within the optical assembly unit 400 such that, upon insertion of the cartridge through the interferometric system housing opening, the downward cantilever bias spring 426 pushes against a top side of the cartridge housing thereby forcing the cartridge housing against an opposite side or bottom portion or surface 428 of the cartridge recess 430 resulting in proper alignment along a vertical plane (see
The light unit 402 is optionally adjustable along various planes for optimal light signal 432 emission. As illustrated, the signal 432 is shown to be emitted and focused by at least one lens 433. A camera unit 406 is situated at an angle relative to the shutter flap element 420 so as to receive the light signal 432 upon exit from the cartridge (see
A first roll adjustment screw 434 and second roll adjustment screw 436 are located on opposing sides of the light unit 402 for adjusting roll of the light unit 402. A first upward adjustment screw 438 and second upward adjustment screw 440 are located in a parallel manner on each side the light unit 402 for adjusting the light unit 402 towards the cartridge system (i.e., substantially upward). An angle of incidence screw 442 is located against the light unit 402 to allow for adjustments to the angle of incidence for proper coupling angle. A translation screw 444 is located direct communication with the light unit 402 to adjust translation in the X axis. A spring element 446 maintains the position of the light unit 402 against the light unite 402 by assisting the adjustment screws (432, 436), incidence screw 442 and translation screw 444.
With specific regard to
Cartridge System Overview
The cartridge systems provided herein includes a cartridge housing. The cartridge housing may be manufactured from any polymer suitable for single or multiple-use. The cartridge may be manufactured according to a variety of additive processing techniques such as 3-D printing. The cartridge may be manufactured via traditional techniques such as injection molding. The polymer may include a coefficient of expansion such that the housing does not expand or contract in a manner that would disrupt alignment of any microfluidic or detection components described herein when the cartridge is exposed to heat or cold environmental conditions.
The cartridge housing may include a light prevention means to aid in reducing, preventing or eliminating ambient, outside light from interfering the detection of one or more analytes. The light prevention means may include colored cartridge housing (e.g., black colored) that is color dyed or coated during manufacture. According to one embodiment, a dye may be introduced to the polymer to provide a specific color to a region of or the entire cartridge housing. Suitable colors include any color that aids in reducing, preventing or eliminating ambient, outside light from interfering the detection of one or more analytes.
The cartridge systems provided herein further includes a detection region. This detection region accommodates or is otherwise adapted to receive an interferometric chip and flow cell wafer. The flow cell wafer includes at least one detection microchannel. The flow cell wafer is located directly above the chip. The detection microchannel may be etched onto a flow cell wafer having a substantially transparent or clear panel or window. The flow cell wafer, the chip or both the flow cell and chip may be coated with a substance that reduces or eliminates fogging or condensation. According to one embodiment, the chip may be heated to reduce or elimination fogging or condensation.
The cartridge systems provided herein are configured or otherwise adapted or designed to easily insert and instantly align within an interferometric system such as, for example, a hand-held interferometric system. By being configured to allow for instant alignment, no further adjustment is required by a user to align any microfluidic components and any internal detection-related components such as the laser, chip with waveguides and exposed channels in a detection region of the cartridge, optical detector and any other focus-related components in the interferometric system.
The cartridge housing includes dimensions that are complimentary in size and shape to the size and shape to an internal surface defining a recess within an interferometric system. As provided and illustrated in the non-limiting examples herein, the cartridge housing may be generally rectangular in overall shape.
According to one embodiment, the cartridge system may be inserted and removed automatically. According to one embodiment, the cartridge housing contains a bar code or QR code. According to one embodiment, the cartridge system contains a bar code or QR code for calibration or alignment.
To aid in alignment, the cartridge housing includes an alignment means on an external surface of the cartridge housing. The alignment means many take a variety of forms that assure instant alignment of any microfluidic components and any internal detection-related components upon insertion of the cartridge within the interferometric system. The alignment means also aids in the prevention of incorrect orientation assertion within the interferometric system and allows for insertion only after proper alignment is attained. The alignment means further allows for the cartridge system to be stabilized to address vibrational distortions.
The alignment means may include at least one male key portion for engaging and securing within a corresponding female rail located in the interferometric system. The male key portion may be disposed on the bottom surface of the cartridge housing, however, the male key portion may be located on any exterior surface of the cartridge housing. Other suitable alignment means include one or more microswitches or sensing devices that guide the cartridge housing to assure proper alignment.
According to a particular embodiment, the cartridge housing includes a top portion and a bottom portion based on the orientation of insertion in an interferometric system. The top portion may include a top surface defining at least one through hole on at least one external surface of either the top portion or bottom portion. The at least one through hole is adapted to receive a removable fastening means for securing the top portion and bottom portion together. Suitable fastening means include screws or other suitable fastener that may be removed. By allowing the top portion and bottom portion of the cartridge housing to be separated and re-attached, a user may open the cartridge housing to allow for cleaning as well as replacement of the chip.
The cartridge system as provided herein may include a temperature control means to control temperature as well as humidity. The cartridge system as provided herein may include a temperature control means to control test sample composition temperature. By controlling temperature and humidity around the cartridge system, the interferometric system can provide more repeatable, precise results. According to one embodiment, the cartridge system contains heating capability to facilitate consistent measurement and operation in cold temperatures. By controlling temperature and humidity around the cartridge system, fogging or condensation that causes interference in the detection region of the cartridge system is reduced or otherwise eliminated. The temperature control means may be located on or within the cartridge housing. According to a single-use cartridge system embodiment, the temperature control means is located on or around the mixing bladder of the microfluidic fluid system described herein. The temperature control means may be located on an exterior surface of the cartridge housing. One suitable temperature control means includes a metal coil that is heated upon introduction of an electric current. Another suitable temperature control means includes one or more warming bands or Peltier devices that can provide heating or cooling.
Each of the cartridge systems described herein include a flow cell having at least one detection microchannel adapted to communicate with one or more test sample compositions flowing through a waveguide channel in a chip beneath the flow cell. According to one embodiment, the cartridge systems may include at least two detection microchannels with each detection microchannel adapted to communicate one or more test sample composition allowing detection of the same or different analytes. According to one embodiment, cartridge system includes a flow cell having at least three detection microchannels with each detection microchannel adapted to communicate one or more test sample composition allowing detection of the same or different analytes. According to one embodiment, cartridge system includes a flow cell having at least four detection microchannels with each detection microchannel adapted to communicate one or more test sample composition allowing detection of the same or different analytes.
Cartridge System—Exemplary Embodiments
An exemplary embodiment of a single-use cartridge system 800 is illustrated in
The cartridge housing 802 further includes an electronic communication means 816 located on a second external surface 818 that is on a different horizontal plane from the top surface 805. The electronic communication means 816 as illustrated includes a plurality of metal contacts.
The cartridge system further includes a vent port 820. The vent port 820 allows for any air in the microfluidic system 870 (see
The chip 832 is substantially transparent and allows the light signal to enter, interact with one or more waveguides channels (See
The bottom surface 823 further defines a light inlet slot 836. The light inlet slot 836 allows for an light signal to enter the cartridge system 800. Particularly, the light inlet slot 836 allows for an light signal to enter the chip 832 and for the light signal to move through any waveguide channels (not shown; see e.g., part 316 of
The microfluidic system 870 further includes second microchannel section 882 having a first end 884 attached in communication with the mixing bladder 880 and a second end 886 attached in communication with a flow cell wafer 888 having at least one detection microchannel 834.
The microfluidic system 870 further includes third microchannel section 890 having a first end 892 attached in communication with at least one detection microchannel 834 and a second end 894 in communication back to the mixing bladder 880 so as to form a closed loop.
The microfluidic system 870 further includes at least one micropump 898. The micropump 898, as illustrated, is a piezoelectric pump that overlays or otherwise engages or touches one or more of the first microchannel section 874, second microchannel section 882, third microchannel section 890 and mixing bladder 880. The micropump 898 manipulates the communication of test sample composition throughout the microfluidic system 870.
The single-use cartridge system 800 may further include a transmission component 897 as provided herein. The single-use cartridge system 800 may further include a location means 899 as provided herein.
An exemplary embodiment of a multiple-use cartridge system 900 is illustrated in
A top view of an embodiment of a multi-use cartridge system 900 is provided in
The cartridge housing 902 further includes an electronic communication means 916 located on a second external surface 918 that is on a different horizontal plane from the top surface 905. The electronic communication means 916 as illustrated includes a plurality of metal contacts. The top surface 905 also includes two port seals 919 and two seal plugs (924, 926).
The bottom surface further includes bottom through holes 908C that align and correspond to the four top through holes 908A. The bottom through holes 908C may be adapted (e.g., threaded) to receive a removable fastening means (not shown) for securing the top portion 904 to a bottom portion 910 (see
The bottom surface 923 further defines a light inlet slot 934. The light inlet slot 934 allows for an light signal to enter the cartridge system 900. Particularly, the light inlet slot 934 allows for an light signal to enter the chip 936 and for the light signal to move through any waveguides in the chip 936 while interacting with analytes in the at least one detection microchannel 994 (see
A valve test structure connection 984 is in communication with any test sample composition in the microfluidic system 970. The valve test structure connection 984 may be fabricated from nitinol shape memory alloy and aids in the movement of test sample composition into the cartridge system 900.
The second microchannel section 979 includes a first end 988 in communication the first microchannel section 974 and a second end 990 in communication with a flow cell 992 having at least one detection microchannel 994. The cartridge system 900 includes a detection region 993 that accommodates or is otherwise adapted to receive the chip 936 and flow cell 992. The chip 936 is substantially transparent and allows the light signal to enter, interact with one or more waveguides channels (not shown; see e.g., part 316 of
The detection microchannel 994 is in communication with a first end 996 of a third microchannel section 998. The third microchannel section 998 includes a flow electrode 1000 to approximate flow rate and is correlated with measured impedance. The third microchannel section 998 includes a second end 1002 in communication with the first end 1004 of a fourth microchannel 1006. The fourth microchannel 1006 includes a second end 1008 in communication with a check valve 1010 which, in turn, is in communication with an egress port 1012. The sample electrode 980, reference electrode 982, and flow electrode 1000 are each fabricated from inert nitinol or other corrosion-resistant conductive material.
The multiple-use cartridge system 900 may further include a transmission component 1014 as provided herein. The multiple-use cartridge system 900 may further include a location means 1016 as provided herein.
An exemplary embodiment of an alternative single-use cartridge system 1100 is illustrated in
Food Applications
By being mobile and utilized near the foodstuff in question, a user may receive results in an efficient manner and any care or remedial measure decisions may be implemented immediately. The interferometric systems provided herein provide a major technical advancement to detect, quantify, and even track various chemicals and pathogens within a food or food processing environment. The systems provided herein provide a means to indicate and otherwise aid in the control of the movement of analytes that impact food safety and quality. The systems provided herein also provide a means to assess the presence of analytes in a food processing environment as well as serve as a microbiome-based monitoring system to provide an early warning system for detection of unwanted pathogens in food.
According to a particular embodiment, the systems provided herein may be utilized to detect and quantify levels of pesticide in a food processing facility. By providing detection and quantification data in an efficient manner within the food processing environment, exposure to analytes may be monitored, adjusted and otherwise controlled. According to such an embodiment, the system will detect and quantify one or more analytes at the parts per million (ppm), parts per billion (ppb) or parts per trillion (ppt) level.
According to a particular embodiment, the systems provided herein may be utilized to detect and quantify levels of 2,4-D (2,4-dichlorophenoxyacetic acid), dicamba (2-methoxy-3,6-dichlorobenzoic acid), butylated hydroxyanisole, butylated hydroxytoluene, recombinant bovine growth hormone, sodium aluminum sulfate, potassium aluminum, sulfate, bisphenol-A (BPA), sodium nitrite/nitrate, polycyclic aromatic hydrocarbons, heterocyclic amines, acrylamide, brominated vegetable oil, artificial food coloring/dyes, and dioxins. According to one embodiment, the system may be utilized to detect and quantify analytes from any vessel or container that may come internally in contact with an analyte such as a pathogen or chemical contaminant. The system as provided herein may be placed in fluid communication with a vessel or other piece of food processing equipment so as to detect and quantify analytes in real time. Fluid communication may be established via a tube or other conduit that allows any fluid containing at least analyte to come in contact with, or flow through, the system as provided herein.
According to one particular embodiment, a fluid source of analytes includes an industrial or commercial vessel adapted to store, process, or carry food. Such a vessel may be located within or around a shipping container that stores and transports food. The shipping container may be located on a truck, train, or other means of transportation. The shipping container may also be located on or around shipping dock.
According to one particular embodiment, the interferometric system provided here may be utilized in connection with or otherwise equipped to a mobile vehicle. Suitable mobile vehicles include, but are not limited to unmanned aerial vehicles (UAV), unmanned ground vehicles (UGV), drones, manned aircraft, and manned vehicles.
Methods of Detection and Quantification
According to one embodiment, the method further includes the optional step of entering 1204 a user identifier (ID) in the system. Additionally, an identification number associated with the sample, analyte or interest or a combination thereof may be entered. The cartridge system utilized may be equipped with a label or sticker carrying identifying such information. The label or sticker may include a QR code including such information. The label or sticker may be removed prior to use. Identifying information may include metadata such as time, GPS data, or other data generated by the interferometric system.
According to one embodiment, the method further includes the step of introducing the target sample to the interferometric system 1206. According to one embodiment, target sample is introduced to the cartridge by a separate device such as a syringe or pump. According to one embodiment, target sample is introduced by an injection device. According to one embodiment, the injection device may be permanently attached to the cartridge system. According to one embodiment, the injection device is a pipette. According to one embodiment, the injection device is a syringe. According to one embodiment, the injection device is a lance, pipette or capillary tube. When utilizing a multiple-use cartridge system, the cartridge system may be fitted to a tube or other transfer mechanism to allow the sample to be continuously taken from a large amount of fluid that is being monitored.
According to one embodiment, the method further includes the step of mixing 1208 the target sample with a buffer solution to form a test sample composition. In a multiple-use cartridge system, such a step may occur prior to the test sample composition being introduced to the cartridge system. In a single-use cartridge system, such a step may occur in the mixing bladder with the assistance of a pump.
The method of detecting and quantifying the level of analyte in a sample includes initiating waveguide interferometry 1210 on the test sample composition. Such a step may include initiating movement of the light signal through the cartridge system as provided herein and receiving the light signal within the detector unit. Any changes in an interference pattern are representative of analyte in the test sample composition. Particularly, such changes in an interference pattern generate data related to one or more analyte in the test sample composition. According to one embodiment, the step of initiating 1210 waveguide interferometry on the test sample composition includes the step of correlating data from the phase shift with calibration data to obtain data related to analyte identity, analyte concentration, or a combination thereof.
According to one embodiment, the method further includes the step of processing 1212 any data resulting from changes in the interference pattern. Such changes in interference pattern may be processed and otherwise translated to indicate the presence and amount of an analyte in a test sample composition. Processing may be assisted by software, processing units, processor, servers, or other component suitable for processing. The step of processing data may further include storing such data in storage means as provided herein.
According to one embodiment, the method further includes the step of transmitting a data signal 1214. The signal may result in the display of data on the system. The step of transmitting data may include displaying the analyte levels via projecting any real time data on a screen as described herein. The step of transmitting data may include transmitting any obtained data to a mobile phone, smart phone, tablet, computer, laptop, watch or other wireless device. The data may also be sent to a device at a remote destination. The remote destination device may be a locally operated mobile or portable device, such as a smart phone, tablet device, pad, or laptop computer. The destination may also be smart phone, pad, computer, cloud device, or server. In other embodiments, the remote destination may be a stand-alone or networked computer, cloud device, or server accessible via a local portable device. A diagnosis of an infection in a chemical environment may be based on the analyte quantity. The diagnosis may be based on the use of one or more immunoglobulins as detection materials.
The method may optionally include the step of disposing of the test sample composition 1216 per legal requirements. Such legal requirements assure that any sample still containing unacceptable levels of pathological contamination are disposed of properly so as not to cause harm to a user or the environment.
According to one embodiment, the method further includes the step of initiating 1218 a cleaning or remedial countermeasure against any analyte detected. Such remedial measure may include introducing cleaning chemicals or beneficial microorganisms to the chemical environment. The remedial measures may work to kill or otherwise neutralize any unwanted analyte present in the chemical environment where a sample was taken.
Although the present specification describes components and functions that may be implemented in particular embodiments with reference to particular standards and protocols, the invention is not limited to such standards and protocols. For example, standards for Internet and other packet switched network transmission (e.g., TCP/IP, UDP/IP, HTML, HTTP) represent examples of the state of the art. Such standards are periodically superseded by faster or more efficient equivalents having essentially the same functions. Accordingly, replacement standards and protocols having the same or similar functions as those disclosed herein are considered equivalents thereof.
Although specific embodiments of the present disclosure are herein illustrated and described in detail, the disclosure is not limited thereto. The above detailed descriptions are provided as exemplary of the present disclosure and should not be construed as constituting any limitation of the disclosure. Modifications will be apparent to those skilled in the art, and all modifications that do not depart from the spirit of the disclosure are intended to be included with the scope of the appended claims.
An interferometric system as provided herein may be set up to aid in rapid detection and quantification of chlorpyrifos on produce in a food processing plant. Chlorpyrifos is an organophosphate insecticide, acaricide and miticide used primarily to control foliage and soil-borne insect pests on a variety of food and feed crops. Chlorpyrifos is not allowed to be present in foods that are being sold in the United States.
For detection and quantification of a chlorpyrifos, one or more antibodies or aptamers specific to chlorpyrifos may be included on the sensing layer as described herein. If the test sample composition is shown to be contaminated with chlorpyrifos, remedial measures may be implemented.
An interferometric system as provided herein may be set up to aid in detection and quantification of one or more target analytes on produce as the produce arrives at a grocery store. A trained user may obtain a sample from the surface of the produce. The test sample may be obtained by an automatic collection device that will deliver a sample aliquot to the interferometric system. The targeted analytes may include any chemical contaminant including, but not limited to, a volatile organic compound such as benzene, toluene, ethylbenzene and xylenes), tetrachloroethylene (PCE), trichloroethylene (TCE), vinyl chloride (VC), and gasoline. Other chemical contaminants include, oil, nitrites, metals, and pesticides.
An interferometric system as provided herein may be set up at a produce storage facility to aid in high throughput detection and quantification of one or more target pathogenic analytes commonly found on produce. Such analytes include, but are not limited to, E. coli, salmonella, pythium, asperigillus, rhizoctonia, or metabolites of each of the same). A sample may be obtained from the surface of the produce and a sample aliquot prepared by wiping the produce with a swab containing buffer. The buffer is expressed from the swab and could be transferred to the device with a pipette. The system may measure both beneficial and pathogenic analytes either independently or in a multiplex fashion.
The present application claims priority to U.S. Provisional Application No. 63/080,222, filed Sep. 18, 2020, the content of which is incorporated herein by reference.
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