Cellular Assay Colorimetric Cell Viability Assay Available substrates for this assay include MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide), MTS (3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium), and XTT (2,3-bis-(2-methoxy-4-nitro-5-sulfophenyl)-2H-tetrazolium-5-carboxanilide). C95027 Colorimetric Cell Viability Assay MTS Assay A colorimetric assay that can assess the viability of cells by quantitation of the reduction of a yellow tetrazolium salt substrate to a product that has a purple color. This assay can measure the cytotoxicity of a chemical or drug by determining the affect of treatment on cell viability. Colorimetric Cell Viability Assay Research Activity MTT Assay C2986858