Human Triosephosphate Isomerase ELISA Kit (A312498) employs the sandwich enzyme immunoassay technique for the quantitative measurement of human Triosephosphate Isomerase in An antibody specific for Triosephosphate Isomerase has been pre-coated onto a 96-well microtiter plate. The standards and test samples are added into the wells and the Triosephosphate Isomerase present in each sample is bound to the wells by the immobilized antibody. Biotinylated Anti-Triosephosphate Isomerase Antibody, which also binds the Triosephosphate Isomerase present in each sample, and Streptavidin-HRP, which binds the Biotinylated Anti-Triosephosphate Isomerase Antibody, are added and the microtiter plate is incubated. Following incubation, unbound Biotinylated Anti-Triosephosphate Isomerase Antibody and unbound Streptavidin-HRP are removed by washing, and two substrate solutions are added to the wells. Color develops in proportion to the amount of Triosephosphate Isomerase captured in each well. The color development is stopped by addition of stop solution which changes the color from blue to yellow and the intensity of the color is then measured. The concentration of Triosephosphate Isomerase in the samples can then be calculated by reading the O.D. absorbance at 450nm in a microplate reader and referring to the standard curve.