Abstract: A method includes capturing a signal of a detection substrate exposed to a sample containing a target substance; determining that the detection substrate is in a testable state; and generating an assessment of the presence of the target substance in the sample.

Abstract: An embodiment of a method for detecting a target substance in a consumable sample comprises receiving a consumable sample; extracting a test sample including a target of interest from the consumable sample with an extraction buffer; transmitting the test sample to an immunoassay device; generating a first indication characteristic of presence of the target substance in the consumable sample upon interfacing the test sample with a probe configured to react with the allergen constituent at the immunoassay device; generating a second indication characteristic upon interfacing the test sample with a bioconjugate configured to react with the allergen constituent at the immunoassay device; generating an analysis of the indication, including at least one of a presence of and an amount of the target substance present in the consumable sample; and providing information derived from the analysis to a user associated with the consumable sample.

Abstract: Systems and methods related to optical nanosensors comprising photoluminescent nanostructures are generally described.

Abstract: Systems and methods related to optical nanosensors comprising photoluminescent nanostructures are generally described.

Abstract: Systems and methods related to compositions including hydrogels and photoluminescent nanostructures are described. The compositions can undergo a change in a physical, chemical, dielectric, or other property upon exposure to an altering stimulus. Changes in one or more properties of the hydrogel may impart a change in the photoluminescence of the nanostructures embedded in the hydrogel.

Abstract: Systems and methods related to optical nanosensors comprising photoluminescent nanostructures are generally described.

Abstract: A composition can include a complex, where the complex includes a photoluminescent nanostructure and a polymer free from selective binding to an analyte, the polymer adsorbed on the photoluminescent nanostructure, and a selective binding site associated with the complex.

Abstract: Systems and methods related to optical nanosensors comprising photoluminescent nanostructures are generally described. Generally, the nanosensors comprise a photoluminescent nanostructure and a polymer that interacts with the photoluminescent nanostructure. In some cases, the interaction between the polymer and the nanostructure can be non-covalent (e.g., via van der Waals interactions). The nanosensors comprising a polymer and a photoluminescent nanostructure may be particularly useful in determining the presence and/or concentration of relatively small molecules, in some embodiments. In addition, in some instances the nanosensors may be capable of determining relatively low concentrations of analytes, in some cases determining as little as a single molecule. In some embodiments, the interaction between the analyte and the nanosensor (e.g.