Abstract: The disclosure provides an optical probe comprising an optical waveguide attached to a molecular switch that produces an altered optical signal upon binding a target molecule. The disclosure also provides an optical sensor system comprising an optical probe, a light source configured to emit the excitation light to be coupled into the optical waveguide of the optical probe; and a detector.

Abstract: The disclosure provides antibody constructs that can reversibly bind to biological or chemical target analytes. Upon target analyte binding, the antibody construct can change its conformational state to produce a detectable readout. An antibody construct can be a single-antibody construct or a dual-antibody construct.

Abstract: The disclosure provides an optical probe comprising an optical waveguide attached to a molecular switch that produces an altered optical signal upon binding a target molecule. The disclosure also provides an optical sensor system comprising an optical probe, a light source configured to emit the excitation light to be coupled into the optical waveguide of the optical probe; and a detector.

Abstract: The disclosure provides aptamer switch polynucleotides whose kinetics and effective binding affinity to a target analyte can be independently tuned. The aptamer switch polynucleotides comprise an aptamer, an intramolecular linker, and a displacement strand.

Abstract: The disclosure is directed to methods and compositions for screening a library of aptamers for aptamers having a binding affinity to a target molecule. Specifically, non-natural nucleotides can be introduced onto aptamers immobilized on the surface of beads. The non-natural nucleotides can then be subsequently chemically modified to include additional binding agents. For example, copper-catalyzed azide-alkyne cycloaddition (CuAAC) reactions can be used to introduce a wide range of binding agents onto non-natural nucleotides on beads.

Abstract: The disclosure is directed to methods and compositions for screening a library of aptamers for aptamers having a binding affinity to a target molecule. The methods and compositions described herein utilize a throughput approach that is able to simultaneously measure binding affinity and link the binding affinity to the identity (e.g., sequence) of the aptamer.

Abstract: This application provides a method of using aptamers to determine the presence of HCP's in a recombinant protein preparation, and provides methods of preparing a plurality of aptamers for use in the method of detecting a plurality of HCP's in a recombinant protein preparation. In accordance with the description, a method of determining the presence or absence of a plurality of HCP's in a recombinant protein preparation comprises: providing a recombinant protein preparation; providing a final pool of aptamers; combining the recombinant protein preparation with the final pool of aptamers; and determining the presence or absence of a plurality of HCP's.

Abstract: This application provides a method of using aptamers to determine the presence of HCP's in a recombinant protein preparation, and provides methods of preparing a plurality of aptamers for use in the method of detecting a plurality of HCP's in a recombinant protein preparation. In accordance with the description, a method of determining the presence or absence of a plurality of HCP's in a recombinant protein preparation comprises: providing a recombinant protein preparation; providing a final pool of aptamers; combining the recombinant protein preparation with the final pool of aptamers; and determining the presence or absence of a plurality of HCP's.

Abstract: The present disclosure provides devices, methods and systems for analyte detection and/or monitoring, e.g., the continuous and/or semi-continuous monitoring of in-vivo analyte concentrations in real time. Generally, the devices, methods and systems of the present disclosure make use of signaling probes; methods or devices for reducing interferent-based fouling of the signaling probes, non-specific binding to the signaling probes and/or occlusion of a sensor surface; and methods and/or devices for providing an adjusted signal based on a detected signal from the signaling probes. Compositions including conformation switching signaling probes are also provided.

Abstract: The invention relates generally to fluid processing and, in particular aspects, processing fluids for detection, selection, trapping and/or sorting of particulate moieties. Sheath flow devices described allow isolation of target species from fluid samples while avoiding non-specific binding of unwanted species to the surfaces of the separation device. Biological fluid processing, detection, sorting or selection of cells, proteins, and nucleic acids is described. The invention finds particular use in diagnostic settings, analyzing a patient's medical condition, monitoring and/or adjusting a therapeutic regimen and producing cell based products.

Abstract: The invention relates generally to fluid processing and, in particular aspects, processing fluids for detection, selection, trapping and/or sorting of particulate moieties. Sheath flow devices described allow isolation of target species from fluid samples while avoiding non-specific binding of unwanted species to the surfaces of the separation device. Biological fluid processing, detection, sorting or selection of cells, proteins, and nucleic acids is described. The invention finds particular use in diagnostic settings, analyzing a patient's medical condition, monitoring and/or adjusting a therapeutic regimen and producing cell based products.

Abstract: The invention relates generally to fluid processing and, in particular aspects, processing fluids for detection, selection, trapping and/or sorting of particulate moieties. Sheath flow devices described allow isolation of target species from fluid samples while avoiding non-specific binding of unwanted species to the surfaces of the separation device. Biological fluid processing, detection, sorting or selection of cells, proteins, and nucleic acids is described. The invention finds particular use in diagnostic settings, analyzing a patient's medical condition, monitoring and/or adjusting a therapeutic regimen and producing cell based products.