Multi-use biosensors are disclosed that include enzymes coupled to nanobeads; the multi-use biosensors are used to detect analytes in fluidic biological samples, and the biosensors also maintain their enzyme activity after many uses. Multi-sensor arrays are disclosed that include multiple biosensors. Also disclosed are methods of producing and using these devices.

A nanoparticle measurement device includes a timing signal generation unit, a low-frequency component extraction unit, a low-frequency component calculation unit, a threshold correction unit, and a measurement unit. The timing signal generation unit generates timing signals. The low-frequency component extraction unit extracts low-frequency components according to the timing signals. The low-frequency component calculation unit calculates an interpolated low-frequency component in accordance with the low-frequency components. The threshold correction unit sets a corrected threshold in accordance with the interpolated low-frequency component. The measurement unit extracts and counts nanoparticle pulse signals from a light reception signal according to the timing signals and the corrected threshold.

Disclosed are a two-layer microfluidic chip with magnetic bead luminescence and a detection system. The chip comprises a top plate and a bottom plate. The top plate comprises a sample addition section, a conjugated ligand storage section, and a sample mixing area, wherein the sample mixing area is in communication respectively with the sample addition section and the conjugated ligand storage section. The bottom plate comprises a flow guiding area, a magnetic bead coating section, a washing area, a detection area, and a washing fluid storage section, wherein the flow guiding area is arranged with a recess that is lower than the bottom wall of the magnetic bead coating section in the height direction, and a flow guiding portion fitted to the recess and connecting the magnetic bead coating section.

Disclosed are compositions and methods for the multiplexed analysis of one or more intracellular targets of a single cell. Exemplary compositions of the disclosure comprise a surface comprising a plurality of capture agents operatively-linked thereto, wherein each capture agent specifically binds to a distinct intracellular target and wherein the plurality of capture agents form a repeating pattern; a substrate comprising a plurality of chambers, wherein the substrate releasably couples with the surface and wherein each chamber of the plurality of chambers comprises at least one repeat of the repeating pattern of the plurality of capture agents of the surface; a coating composition comprising a cell lysis composition; and a linker composition comprising a functionalization component and an extension component.

This disclosure generally relates to embodiments for detecting presence of one or more allergens in mammalian milk. An exemplary embodiment relates to a method to detect presence of one or more allergen molecules in a composition of mammalian milk, the method includes the steps of: providing a substrate having a plurality of detection sites thereon, each of the plurality of detection sites configured to detect presence of one or more allergen molecules; exposing the plurality of detection sites to a quantity of mammalian milk; detecting presence of a first allergen molecule at a first of the plurality of detection sites by detecting a fragment of DNA, RNA, or amino acids corresponding to the first allergen molecule; wherein the detected fragment excludes naturally occurring molecules present in the composition of mammalian milk.

Provided herein is a method of loading wells with a liquid droplet, or a portion thereof, wherein each liquid droplet comprises solid supports and a detergent or surfactant, such that the detergent or surfactant reduces the contact angle between the liquid droplet and the wells. Also provided is a method of detecting and quantifying an analyte of interest in a sample, which involves loading wells in an array with a liquid droplet according to aforementioned method, wherein the liquid droplet comprises an analyte captured on a solid support.

Two methods for quantifying fibrin/fibrinogen degradation products (“FDP”) in a blood sample. The first method features obtaining a blood sample from a non-human animal, centrifuging the blood sample to obtain a first supernatant and collecting the first supernatant, centrifuging the first supernatant to obtain a second supernatant and collecting the second supernatant, diluting the second supernatant, contacting the diluted second supernatant with a reagent that contains antibodies specifically binding to FDP, and detecting an amount of antibodies specifically bound to FDP, thereby quantifying FDP in the blood sample. The second method requires subjecting the diluted second supernatant to a quantitative immunoassay that specifically detects FDP to quantify the amount of FDP in the non-human blood sample.

The present disclosure provides novel gravitational flow assays for detecting an antigen in a biological sample using DNA-capture sequences. Specifically, gravitational flow assays and methods of detecting viruses, including coronaviruses, are provided.

An embodiment includes a sample receiving region, a first diagnostic element that includes one or more colorimetric analysis regions, and a second diagnostic element that includes one or more lateral flow assay analysis regions. The embodiment also includes a first flow path that allows a portion of a liquid deposited at the sample receiving region to flow to the first diagnostic element. The embodiment also includes a second flow path that allows a portion of the liquid deposited at the sample receiving region to flow to the second diagnostic element.

A filter film includes a through-hole and a recessed portion having a size capable of capturing one particle, in which the recessed portion is open to one face of the filter film, the through-hole in the one face has a shape or a size such that the one particle is not capable of passing through the through-hole, and the through-hole and the recessed portion are disposed close to each other.