Principle of Assay
Universal Avidin ELISA Kit (A303879) is a 3 hour sandwich Enzyme-Linked Immunosorbent Assay (sELISA) designed for the in vitro quantitative determination of universal Avidin in serum, plasma, tissue homogenates, and other biological fluids. A 96-well microtiter plate has been pre-coated with an antibody specific for Avidin. Standards and samples are added to the wells, where Avidin binds to the immobilized capture antibody. Following incubation, unbound components are removed by washing and an HRP-conjugated detection antibody specific for Avidin is added to the wells. The detection antibody binds the captured Avidin to form an antibody-antigen-antibody sandwich complex. After further incubation and washing, TMB substrate solution is 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 Avidin captured in each well. The concentration of Avidin is calculated by reading the absorbance at 450 nm and comparing the values with the standard curve.
