Principle of Assay
Canine Factor Xa ELISA Kit (A326553) is a 4 hour sandwich Enzyme-Linked Immunosorbent Assay (sELISA) designed for the in vitro quantitative determination of canine Factor Xa in serum, plasma, cell culture supernatant, cell or tissue lysate, and other biological fluids. A 96-well microtiter plate has been pre-coated with an antibody specific for Factor Xa. Standards and samples are added to the wells, where Factor Xa binds to the immobilized capture antibody. Following incubation, unbound components are removed by washing and a biotinylated detection antibody specific for Factor Xa is added to the wells. The detection antibody binds the captured Factor Xa to form an antibody-antigen-antibody sandwich complex. After further incubation and washing, HRP-Streptavidin conjugate is added to the wells. TMB substrate solution is then added to visualize the HRP enzymatic reaction. This produces a blue-coloured product that changes to yellow following addition of acidic stop solution. The intensity of the yellow colour is directly proportional to the amount of Factor Xa captured in each well. The concentration of Factor Xa is calculated by reading the absorbance at 450 nm and comparing the values with the standard curve.