Principle of Assay
Human Interleukin 40 ELISA Kit (A336307) employs the sandwich enzyme immunoassay technique for the quantitative measurement of human Interleukin 40 in serum, plasma, cell culture supernatant, cell or tissue lysate, and other liquid samples. An antibody specific for Interleukin 40 has been pre-coated onto a 96-well microtiter plate. The standards and test samples are added into the wells and the Interleukin 40 present in each sample is bound to the wells by the immobilized antibody. Following incubation, the wells are washed and then incubated with Biotinylated Anti-Interleukin 40 Antibody, which binds the captured Interleukin 40 present in each well. Following incubation, unbound biotinylated detection antibody is removed by washing, and an HRP-Streptavidin conjugate is added to the wells and the microtiter plate is incubated. Following incubation and washing, TMB substrate solution is then used to visualize the HRP enzymatic reaction by catalysis to produce a blue-coloured product that changes to yellow after addition of acidic stop solution. The density of yellow is proportional to the amount of Interleukin 40 captured in each well. The concentration of Interleukin 40 can then be calculated by reading the O.D. absorbance at 450nm in a microplate reader and referring to the standard curve.
