The Eagle Biosciences Apolipoprotein AII ELISA Assay Kit employs the quantitative sandwich enzyme immunoassay technique. An antibody specific for ApoAII has been pre-coated onto a microtiter plate. Standards or samples are pipetted into the wells and any ApoAII present is bound by the immobilized antibody. After washing away any unbound substances, a biotin-conjugated antibody specific for ApoAII is added to each well and incubate. Following a washing to remove unbound substances, streptavidin conjugated to Horseradish Peroxidase (HRP) is added to each microplate well and incubated. After washing away any unbound antibody-enzyme reagent, a substrate solution (TMB) is added to the wells and color develops in proportion to the amount of ApoAII bound in the initial step. The color development is stopped by the addition of acid and the intensity of the color is measured at a wavelength of 450nm ±2nm.The concentration of ApoAII in the sample is then determined by comparing the O.D of samples to the standard curve. Sample Types: plasma, serum or other biological fluids. Range: 313 - 20000 pg/ml. Sensitivity: 500 pg/ml. Time: 4.5 hours ? Apolipoprotein AII is the second most abundant protein of the high density lipoprotein particles. The protein is found in plasma as a monomer, homodimer, or heterodimer with apolipoprotein D. Defects in Apolipoprotein AII may result in apolipoprotein AII deficiency or hypercholesterolemia. Apolipoprotein AII may stabilize HDL (high density lipoprotein) structure by its association with lipids, and affect the HDL metabolism.