Abstract: A method for determining a concentration of an analyte in a fluidic sample is described. A sample is applied to a biosensor including an electrochemical cell having electrodes. A predetermined voltage waveform is applied during at least first and second time intervals. At least first and second current values are measured during the first and second time intervals, respectively. A turning point time is determined during the first time interval at which the measured first current values transition from a first to a second profile. The concentration of analyte in the sample is calculated based on determined turning point time and at least one measured current value. In another example, a physical characteristic of the sample is estimated based on measured current values. The concentration is calculated using a first or second model if the estimated physical characteristic of the sample is in a first or second range, respectively.

Abstract: There is provided a system for measuring a property of a sample that comprises a test strip for collecting the sample; a diagnostic measuring device configured to receive the test strip and measure a concentration of an analyte in the sample received on the test strip; and the diagnostic measuring device further comprising a processor programmed to execute an analyte correction for correcting a measurement of the sample due to one or more interferents, comprising: calculating an interferent impedance measurement including a magnitude measurement and a phase measurement using a switched capacitor accumulator to measure a phase angle; and adjusting the measurement of the analyte in the sample using that the calculated interferent impedance measurement.

Abstract: A nanoelectric field effect sensor uses the field created by the surface charge profile of biomolecular binding to modulate the current flowing between a source and a drain. We have shown that a patterned side or top gate can be used to calibrate the biomolecular field modulation. This approach provides an electrical sensitivity characterization of the sensor before exposing it to sample fluid. Furthermore, a side gate or a top gate voltage with the right sign can be used to control the binding event during functionalization or sensing. For instance, a negative gate voltage can prevent binding of negatively charged proteins on a sensor. This approach of electric-field control of binding can be used in a differential sensor configuration as well. For instance, in a two-sensor single-bridge technique, one of the sensors can be exposed to a local electric field to prevent binding events, which can then be used for background cancellation in a second sensor, not exposed to the electric field.

Abstract: Various methods, devices, and systems for determining the concentration of microorganisms in a sample and determining the susceptibility of such microorganisms to one or more antibiotics or other types of anti-infectives are disclosed herein. More specifically, methods for quantifying microorganisms based on redox reactions are disclosed along with systems and devices for quantifying such microorganisms using certain oxidation reduction potential (ORP) sensors. Moreover, methods for determining the susceptibility and the degree of susceptibility of microorganisms to one or more anti-infectives are disclosed along with multiplex systems for such assays.

Abstract: Analyte measurement devices and methods of measuring an analyte in a sample. At least one of the methods include: applying an electrical analysis signal to the sample during a measurement time interval (MT), wherein the electrical analysis signal, when transferred into a frequency space, comprises a superposition of two or more non-zero frequency components at least at a sampling time; measuring at least one electrical response signal from the sample; analyzing the electrical response signal; and determining the amount of the analyte in the sample based on the analyzing.

Abstract: A system and method comprising the steps of: depositing a first electrode metal on an insulating substrate or layer; creating a trench component, in which said trench component comprises a section of said first electrode metal or both first electrode metal and insulating substrate or layer with a depth based on at least one of, a molecular device element, a trenched bottom electrode, and a liftoff molecular device (TBELMD) to be produced; insulating said first electrode metal from a predetermined material deposited in said trench component; and depositing a second electrode metal on said predetermined material deposited in said trench component.

Abstract: Sensors having an advantageous design and methods for fabricating such sensors are generally provided. Some sensors described herein comprise pairs of electrodes having radial symmetry, pairs of nested electrodes, and/or nanowires. Some embodiments relate to fabricating electrodes by methods in which nanowires are deposited from a fluid contacted with a substrate in a manner such that it evaporates and is replenished.

Abstract: A method for determining contamination of a biosensor in which the biosensor is loaded into a test meter and a sample is then applied. First and second predetermined test voltages are applied between spaced electrodes of the biosensor for respective first and second predetermined time intervals. First and second current values are measured during the respective first and second predetermined time intervals. Reference values are determined based on the measured first and second current values. Based on one or more of the reference values, a determination of contamination is made. Reporting of the analyte concentration of the sample can be suppressed based on the determination.

Abstract: Provided is a nanoplasmonic sensor and a kit for biomolecule analysis, and a method of analyzing a biomolecule using the same. The method includes: providing the nanoplasmonic sensor including a dielectric grating extending in one direction, and a metal structure disposed to cover an upper surface and a side surface of the dielectric grating and have at least one bent portion; immobilizing a first probe molecule on a surface of the metal structure; hybridizing an analyte with the first probe molecule by introducing the analyte having a base sequence complementary to the first probe molecule; binding a second probe molecule that is hybridized with the first probe molecule to the analyte; binding an enzyme to the second probe molecule; introducing a substrate that reacts with the enzyme to produce a precipitate by an enzymatic reaction; and measuring localized surface plasmon resonance in the metal structure.

Abstract: A determination method includes: using a microchip, including a capillary flow path and a sample reservoir connected to the capillary flow path at an upstream side, to fill the capillary flow path with a first solution for electrophoresis, and supply the sample reservoir with a second solution containing an analyte; applying a voltage between the sample reservoir supplied with the second solution and the inside of the capillary flow path filled with the first solution, to move a component contained in the second solution in the capillary flow path and separate the component in the capillary flow path; optically detecting a value related to a component difference between the first solution and the second solution, other than a value related to the analyte, for the separated component; and determining whether the optical detection is favorable or poor by comparing the optically detected value with a predetermined threshold value.

Abstract: Device and methods for use in a biosensor comprising a multisite array of test sites, the device and methods being useful for modulating the binding interactions between a (biomolecular) probe or detection agent and an analyte of interest by modulating the pH or ionic gradient near the electrodes in such biosensor. An electrochemically active agent that is suitable for use in biological buffers for changing the pH of the biological buffers. Method for changing the pH of biological buffers using the electrochemically active agents. The methods of modulating the binding interactions provided in a biosensor, analytic methods for more accurately controlling and measuring the pH or ionic gradient near the electrodes in such biosensor, and analytic methods for more accurately measuring an analyte of interest in a biological sample.

Abstract: The present invention relates to an enzymatic electrode comprising a conductive surface and wherein a conjugate comprising at least one enzyme molecule is covalently bound to the conductive surface. The electrode is suitable for continuous analyte monitoring, particularly for continuous glucose monitoring (CGM) with glucose oxidase (GOD) as enzyme molecule. Further, the invention relates to an electrochemical sensor for measuring the concentration of an analyte, e.g. glucose under in vivo conditions comprising the enzymatic electrode.

Abstract: Analyte sensors and methods for fabricating analyte sensors are provided. In an exemplary embodiment, a method for fabricating a planar flexible analyte sensor includes sputtering platinum onto a polyester base layer to form a layer of platinum. The method includes patterning the layer of platinum to form working electrodes and additional electrodes. Further, the method includes forming an insulating dielectric layer over the base layer, wherein the insulating dielectric layer is formed with openings exposing portions of the working electrodes and portions of the additional electrodes. Also, the method includes partially singulating individual sensors from the base layer, wherein each individual sensor is connected to the base layer by a tab. The method further includes depositing an enzyme layer over the exposed portions of the working electrodes and coating the working electrodes with a glucose limiting membrane.

Abstract: A gas sensor comprises a basic part and a sensing layer deposited on the basic part. The basic part includes a circuit board and at least one surface acoustic wave element disposed on the circuit board. The sensing layer is a nanocomposite film of reduced graphene oxide/tungsten oxide/polypyrrole deposited on the surface acoustic wave element. The sensing layer combines reduced graphene oxide, metal oxide, and conductive polymer, so that the sensing layer is able to perform sensing at room temperature, and can be more sensitive. The present invention provides a method for manufacturing a gas sensor, and a gas sensing system including the gas sensor.

Abstract: The present disclosure relates to biosensors (10) having a receptor layer (5) and a mediator layer (6), the receptor layer including ethylene receptor molecules. The present disclosure also relates to sensor units (20) comprising one or more biosensors (10) and a controller (11). In some embodiments, one or more sensor units (20) may be in wireless communication with a receiver module or a network gateway.

Abstract: Provided herein are glucose and galactose biosensors and methods of making and using the same.

Abstract: A biological sample analysis chip including a first substrate, a membrane disposed on the first substrate, a first liquid tank which is provided with a first electrode, a plurality of second liquid tanks each of which is provided with at least one flow path and a second electrode; and a second substrate disposed below the first substrate, in which the plurality of second liquid tanks are substantially insulated from each other, the membrane disposed on the first substrate is disposed between the first liquid tank and the plurality of second liquid tanks so as to form a portion of the first liquid tank and a portion of the plurality of second liquid tanks, and the second substrate is provided with the at least one flow path and the second electrode so as to form a portion of the plurality of second liquid tanks.

Abstract: Provided is a biometric information measurement method. The method includes providing a bio-material including at least one of cells and tissues, contacting a first electrode and a second electrode with the bio-material and applying a first electrical signal and a second electrical signal to the bio-material, sensing a third electrical signal from the bio-material, and analyzing an oxygen concentration in the bio-material from the third electrical signal.

Abstract: It is intended to provide, for example, a liquid sample measurement device capable of measuring the amounts of components of a liquid with a high accuracy. A first voltage is applied to an electrode pair 21, 22, which composes a biosensor 1, to obtain a first response value, a second voltage is applied to an electrode pair 23, 24, which composes the biosensor 1, to obtain a second response value, and a current that is generated when a third voltage is applied to an electrode pair 23, 27, which composes the biosensor 1, is detected to obtain a third response value. A liquid sample measurement device 6 uses the first response value, the second response value, and the third response value to obtain the concentration of glucose and the amount of blood cells of blood as well as the value equivalent to the temperature of the biosensor 1.

Abstract: A sensor assembly for detecting at least one analyte in a body fluid includes an electrochemical sensor, a body mount that attaches to a body of a user and an inserter that transfers the sensor to the body mount. A first adhesive is attached to one or both of the body mount or the sensor, and the first adhesive attaches the sensor to the body mount. A second adhesive is attached to one or both of the sensor or the inserter and releasably attaches the sensor to the inserter. The assembly has an initial position in which the sensor is attached to the inserter via the second adhesive and a final position in which the sensor is attached to the body mount via the first adhesive. Transferring the sensor from the initial position to the final position releases the sensor from the inserter.

Abstract: An apparatus for insertion of a medical device in the skin of a subject is provided.

Abstract: An apparatus for insertion of a medical device in the skin of a subject is provided.

Abstract: A system and method are directed to detecting the presence of heavy metals in a flowing fluid, such as a drinking water supply. The system includes a first chamber for receiving a filtered portion of the fluid and a second chamber for receiving an unfiltered portion of the fluid. A test device measures electrical properties of the filtered fluid in the first chamber and the unfiltered fluid in the second chamber, such as an electric potential difference, and a controller can use the measured electrical properties to detect the presence or quantity of one or more heavy metals within the fluid, such as lead, cadmium, zinc, nickel, and/or copper.

Abstract: A diagnostic Electrochemical Impedance Spectroscopy (EIS) procedure is applied to measure values of impedance-related parameters for one or more sensing electrodes. The parameters may include real impedance, imaginary impedance, impedance magnitude, and/or phase angle. The measured values of the impedance-related parameters are then used in performing sensor diagnostics, calculating a highly-reliable fused sensor glucose value based on signals from a plurality of redundant sensing electrodes, calibrating sensors, detecting interferents within close proximity of one or more sensing electrodes, and testing surface area characteristics of electroplated electrodes. Advantageously, impedance-related parameters can be defined that are substantially glucose-independent over specific ranges of frequencies. An Application Specific Integrated Circuit (ASIC) enables implementation of the EIS-based diagnostics, fusion algorithms, and other processes based on measurement of EIS-based parameters.

Abstract: One aspect of the invention provides a method of determining metal ion levels in the patents due to corrosion and wear processes of the metallic implant in a human or veterinary patient. One embodiment provides a cost effective and patient driven early diagnostic method which has a potential application in orthopedics and dentistry. In one embodiment, the method includes the use of an electrochemical biosensor to detect metal ions or particles in a sample taken from a patient having a metallic implant.

Abstract: This invention is based, in part, on our discovery of an essentially one-step, label-free system comprising a sensing unit having a redox current reporter and a nucleic acid sequence complementary to that of a target nucleic acid of interest or sufficiently complementary to that of the target nucleic acid or a sequence therein to specifically bind the target nucleic acid. The sensing unit is bound to an electroconductive substrate (e.g., a carbon- or metal-containing microelectrode (e.g., a gold microelectrode)), and the system includes a signal amplification mechanism that does not rely upon a redox enzyme and thereby overcomes a fundamental limitation of microelectrode DNA sensors that fail to generate detectable current in the presence of only small amounts of a target nucleic acid.

Abstract: Disclosed are systems and methods for generating graphical displays of analyte data and/or health information. In some implementations, the graphical displays are generating based on a self-referential dataset that are modifiable based on identified portions of the data. The modified graphical displays can indicate features in the analyte data of a host.

Abstract: The invention provides a method for establishing a separable regeneration system for verifying regeneration effect between two antioxidants, which belongs to the field of regeneration effect of antioxidants. According to different solubilities of two antioxidants, lipid-soluble antioxidant is first combined into PE film, and water-soluble antioxidant is dissolved into deionized water and a separable regeneration system where antioxidants can contact with other but not dissolve in each other is formed. This method compares the differences of change of antioxidant capacity in aqueous phase with and without lipid-soluble antioxidant so that to judge whether the added lipid-soluble antioxidant has regeneration effect on aqueous-soluble antioxidant. The present invention effectively verifies the regeneration effect between different antioxidants, and has advantages of simple operation, less interference factors, intuitive and high efficiency.

Abstract: Measurement of target analytes is carried out with an enzyme-based sensor. The enzyme hydrogel is protected by a porous layer of a metallic material. The size of the pores is small enough to prevent degradation of the enzyme layer caused by the immune system of an organism, but large enough to allow transfer of molecules that participate in the electrochemical reaction allowing the enzyme to detect the target analytes.

Abstract: Embodiments of the present disclosure relate to NADP-dependent oxidoreductase compositions, and electrodes, sensors and systems that include the same. Also provided are methods for making the compositions and for detecting and/or measuring analytes with NADP-dependent oxidoreductase compositions.

Abstract: A metal interconnect structure can be fabricated within an integrated circuit (IC). A recess can be created in an IC dielectric layer and a surface modulation liner can be formed by depositing two different metallic elements onto the surfaces of the recess. One metallic element can have a standard electrode potential greater than a standard electrode potential of an interconnect metal, and the other metallic element can have a standard electrode potential less than the standard electrode potential of the interconnect metal. A metal interconnect structure can be formed by filling the remainder of the recess with interconnect metal, which is physically separated from the dielectric layer by the surface modulation liner. The surface topography of the metal interconnect structure can be modulated with a polishing process, by removing a top portion of the interconnect metal and a top portion of the surface modulation liner.

Abstract: The invented organic memristor/memcapacitor device comprises arrayed cross-bar donut-shape toroidal matrix self-assembling membrane on an electrode mimicking mitochondria's double membrane surface structure and the direct electron-relay function, that used to mimic functions of Fibroblast Growth Factor Receptor 1 (FGFR1) and choline acetyltransferase (CHAT), which enables bio-communication signals flowing directly between the endotoxin interacted membrane electrode assembly (MEA) working electrode and a cathodic electrode; and from a biomarker Acetyl coenzyme A (AcCoA) interacted the MEA electrode and the cathodic electrode when applied a definite potential, respectively, for detection of a single E. coli cell and detection of a picomolar concentration of AcCoA under nature enzyme-free, antibody-free and reagent-free conditions. The sensor offers multiple functions for monitoring neuronal synapse pulse energy output.

Abstract: A method for determining a concentration of an analyte in a fluidic sample is described. A sample is applied to a biosensor including an electrochemical cell having electrodes. A predetermined voltage waveform is applied during at least first and second time intervals. At least first and second current values are measured during the first and second time intervals, respectively. A turning point time is determined during the first time interval at which the measured first current values transition from a first to a second profile. The concentration of analyte in the sample is calculated based on determined turning point time and at least one measured current value. In another example, a physical characteristic of the sample is estimated based on measured current values. The concentration is calculated using a first or second model if the estimated physical characteristic of the sample is in a first or second range, respectively.

Abstract: Viruses, including corona viruses such as COVID-19, are often present in the mouth or nose of a person before they infect the body. The disclosed electrochemical device destroys or denatures viruses in the mouth or nose rendering the viruses ineffective to cause infection by applying a low voltage potential to the mucus. The device has a potentiostat powered by a small battery embedded in a plastic frame that fits in a person's mouth. The device has electrodes to contact the mucus of the mouth or nose. The mucus serves as electrolyte, conducting ions as well as viruses with their protein “skin” towards the electrode. The viruses are adsorbed onto the metal probes where the electrical current denatures the protein skin of the virus rendering the virus ineffective to cause infection.

Abstract: An apparatus for insertion of a medical device in the skin of a subject is provided.

Abstract: An apparatus for insertion of a medical device in the skin of a subject is provided.

Abstract: Methods and systems accurately determine an analyte concentration in a fluid sample. In an example embodiment, a receiving port receives a test sensor. The test sensor includes a fluid-receiving area for receiving a fluid sample. The fluid-receiving area contains a reagent that produces a measurable reaction with an analyte in the fluid sample. The test sensor has a test-sensor temperature and the reagent has a reagent temperature. A measurement system measures the reaction between the reagent and the analyte. A temperature-measuring system measures the test sensor temperature when the test sensor is received into the receiving port. A concentration of the analyte in the fluid sample is determined according to the measurement of the reaction and the measurement of the test sensor temperature. A diagnostic system determines an accuracy of the temperature-measuring system. The calculation of the analyte concentration may be adjusted according to the accuracy of temperature-measuring system.

Abstract: The invention provides novel microfluidic coulometric sensors having a silver (Ag) band electrode longitudinally placed in a microchannel affording visual readout suitable for the naked eye, and methods of fabrication and applications thereof.

Abstract: A method of making an electrochemical sensor strip that includes: depositing a first electrode on a base; depositing a second electrode on the base; applying a first layer onto the first electrode; and applying a second layer onto the second electrode. The first layer includes an oxidoreductase and a mediator. The second layer includes a soluble redox species.

Abstract: A determination method includes: using a microchip, including a capillary flow path and a sample reservoir connected to the capillary flow path at an upstream side, to fill the capillary flow path with a first solution for electrophoresis, and supply the sample reservoir with a second solution containing an analyte; applying a voltage between the sample reservoir supplied with the second solution and the inside of the capillary flow path filled with the first solution, to move a component contained in the second solution in the capillary flow path and separate the component in the capillary flow path; optically detecting a value related to a component difference between the first solution and the second solution, other than a value related to the analyte, for the separated component; and determining whether the optical detection is favorable or poor by comparing the optically detected value with a predetermined threshold value.

Abstract: A non-leaching mediator may include a polymer having a polymeric backbone, and a plurality of phenothiazine groups bonded to the polymeric backbone. The plurality of phenothiazine groups may include at least one of a phenothiazine group having the general formula (IV): and salts thereof, where n is about 9 and “R” represents the polymeric backbone to which the phenothiazine group is bonded, and a phenothiazine group having the general formula (V): and salts thereof, where n is about 9 and “R” represents the polymeric backbone to which the phenothiazine group is bonded.

Abstract: A universal electrochemical micro-sensor can be used either as a biosensor or an environmental sensor. Because of its small size and flexibility, the micro-sensor is suitable for continuous use to monitor fluids within a live subject, or as an environmental monitor. The micro-sensor can be formed on a reusable glass carrier substrate. A flexible polymer backing, together with a set of electrodes, forms a reservoir that contains an electrolytic fluid chemical reagent. During fabrication, the glass carrier substrate protects the fluid chemical reagent from degradation. A conductive micromesh further contains the reagent while allowing partial exposure to the ambient biological or atmospheric environment. The micromesh density can be altered to accommodate fluid reagents having different viscosities. Flexibility is achieved by attaching a thick polymer tape and peeling away the micro-sensor from the glass carrier substrate.

Abstract: The present disclosure relates to an electron transfer mediator comprising the osmium complex or a salt thereof, a reagent composition for an electrochemical biosensor, and an electrochemical biosensor, where the osmium compound or its salt maintains a stable oxidation-reduction form for an extended time period, a capacity to react with oxidoreductase being capable of performing the redox reaction of the target analytes, and no effect of oxygen partial pressure.

Abstract: A physiological characteristic sensor, a method for forming a physiological characteristic sensor, and a method for forming a platinum deposit having a rough surface are presented here. The method for forming a physiological characteristic sensor includes immersing a sensor electrode in a platinum electrolytic bath. Further, the method includes performing an electrodeposition process by sequentially applying a pulsed signal to the sensor electrode, wherein the pulsed signal includes a repeated cycle of a first current and a second current different from the first current, and applying a non-pulsed continuous signal to the sensor electrode, wherein the non-pulsed continuous signal includes a non-repeated application of a third current, to form a platinum deposit on the sensor electrode.

Abstract: At least one electrode is integrated on a lab on a chip cartridge in a sample preparation chamber of the cartridge, a DNA hybridization chamber of the cartridge, a protein assay chamber of the cartridge, and/or a detection chamber of the cartridge, for example, where the electrode is used to generate pH electrochemically in order to activate, deactivate, or intermediately attenuate an enzyme's activity on demand, in order to increase the fidelity of analyte detection, for cell lysis, for protein extraction, for DNA dehybridization, for primer hybridization control, for sample pre concentration, and/or for washing to remove non target species.

Abstract: A system and method for fabricating at least one of, a molecular device element and a TBELMD including depositing a first electrode material on an insulating substrate or layer, performing a photolithography process in the first electrode material, creating a trench component in the first electrode material with the photolithography process, determining a section of the electrode material to remove based on at least one of, a molecular device element and a TBELMD to be produced, removing the section of said first electrode material, oxidizing a portion of the first electrode material, creating a first insulator part from the oxidized portion of the first electrode material, in which the oxidized portion of the first electrode material includes at least a first electrode metal surface, depositing a second electrode material, and bridging the first and second electrode material.

Abstract: The present application provides devices, systems and methods for detecting the presence and/or length of an analyte. More specifically, the present application is directed to a structure and system that includes a micro-capacitive sensor array for detecting the presence of an analyte in a sample and determining the length and/or composition of an analyte, such as a nucleic acid, as well as methods for using the same.

Abstract: An automated method of evaluating a collected fluid sample includes: filling a sample cavity with the collected fluid sample; adding a buffer solution; separating the collected fluid sample into a first portion and a second portion; mixing the second portion with tagged antibodies; removing leftover tagged antibodies; and measuring a difference between the first portion and the second portion. A sample collection and testing device includes: a reference cavity comprising a reference fluid sample; a test cavity comprising a test fluid sample; a reference measurement element associated with the reference cavity; and a test measurement element associated with the test cavity. A method of evaluating a collected fluid sample including: separating the sample; pumping a first portion to a first measurement cavity; adding a solution to a second portion and pumping the mixture to a second measurement cavity; and measuring a charge difference between the first and second measurement cavities.

Abstract: This disclosure describes, in one aspect, a device for electrochemical quantitation of autoantibodies. Generally, the device includes a housing that defines a plurality of channels and at least two reaction zones. A first reaction zone includes a porous membrane and a first electrode assembly in fluid communication with a first channel. The first reaction zone also includes a first plurality of autoantigens immobilized to the porous membrane. The first electrode assembly is in communication with an amperometric reader. A second reaction zone includes a porous membrane and a second electrode assembly in fluid communication with a second channel. The second reaction zone includes a second plurality of autoantigens immobilized to the porous membrane. The second electrode assembly is in communication with the amperometric reader. Finally, the device includes a source of negative pressure in fluid communication with the first reaction zone and the second reaction zone.

Abstract: A measuring method of measuring a concentration of a target ingredient in a sample by using a sensor including an interdigitated array electrode that includes a first electrode and a second electrode, and a reagent layer on the interdigitated array electrode, the measuring method includes: applying a voltage to between the first electrode and the second electrode; measuring a first current value of an electric current flowing between the first electrode and the second electrode; measuring a second current value of the current flowing between the first electrode and the second electrode; calculating the concentration of the target ingredient in the sample, based on a third current value; calculating a correction value, based on the first current value and the second current value; and a step of correcting the concentration of the target ingredient in the sample, based on the correction value.