The present disclosure relates devices and methods for analyzing intact antibodies, antibody subunits, antibody drug conjugate subunits, antibody drug conjugates, and intact proteins in a biological mixture.

The present invention provides assays and assay systems for use in spatially encoded biological assays. The invention provides an assay system comprising an assay capable of high levels of multiplexing where reagents are provided to a biological sample in defined spatial patterns; instrumentation capable of controlled delivery of reagents according to the spatial patterns; and a decoding scheme providing a readout that is digital in nature.

Devices and methods for characterization of samples are provided. Samples may comprise one or more analytes. Some methods described herein include performing enrichment steps on a device. Some methods described herein include performing mobilization of analytes. Analytes may then be further processed and characterized.

The present invention provides photo-cleavable anionic surfactants, particularly 4-hexylphenylazosulfonate (Azo) and sodium 4-hexylphenylazosulfonate derivatives, which can be rapidly degraded upon UV irradiation, for top-down and bottom-up proteomics. These surfactants can effectively solubilize proteins and peptide fragments with performance comparable to sodium dodecyl sulfate (SDS) and are compatible with mass spectrometry analysis of the solubilized proteins and peptide fragments. Top-down proteomic studies using the present photo-cleavable anionic surfactants has allowed the detection of 100-fold more unique proteoforms as compared to controls and has enabled the solubilization of membrane proteins for comprehensive characterization of protein post-trans-modifications. In addition, the present photo-cleavable anionic surfactants are also suitable for dissolving polypeptides in bottom-up proteomic experiments including extracellular matrix proteomics, and are suitable as a substitute for SDS in gel electrophoresis.

The present disclosure provides compositions and methods for tracking vegetation through the production and distribution cycle, and for distinguishing between plants or crops having different characteristics.

Embodiments of the present invention relate to reagents and their use for elemental imaging mass spectrometry of biological samples. The embodiments comprising methods for quantifying one or more analytes within a sample, comprising the steps of: (a) providing the sample, wherein the one or more analytes are immobilized to a sample carrier, wherein the sample has been labelled with one or more mass tags comprising one or more labelling atoms, (b) performing mass cytometry on the sample to determine the level of the one or more labelling atoms, wherein the level of the one or more labelling atoms corresponds to the copy number of the one or more analytes.

The present invention provides assays and assay systems for use in spatially encoded biological assays. The invention provides an assay system comprising an assay capable of high levels of multiplexing where reagents are provided to a biological sample in defined spatial patterns; instrumentation capable of controlled delivery of reagents according to the spatial patterns; and a decoding scheme providing a readout that is digital in nature.

Provided herein is a method of isolating cellular components from at least one region of interest in a planar tissue section.

The present invention provides a degradable microbead comprising a polymer molecule crosslinked by a crosslinking agent, wherein the polymer molecule and/or the crosslinking agent comprises a sensitive chemical bond that is cleavable through a chemical and/or light treatment, thereby resulting in the degradation of the degradable microbead. The present invention also provides a method of separating a target protein from a sample. By using the degradation of the degradable microbead to replace an elution step in protein purification, it is possible to select a combination of target protein and affinity ligand with a stronger affinity, thereby improving the protein purification efficiency. The method is especially suitable for the high-throughput preparation of multiple protein samples, for example providing a protein sample for electron microscope observation or mass spectrometry measurement.

Provided are methods for quantitating an amount of a polypeptide that comprises a portion of an antibody present in a sample (e.g., a plasma or serum sample) wherein the antibody comprises a constant region (e.g., a heavy chain or light chain constant region) that comprises an engineered mutation.