Bioactivity: Nitro blue tetrazolium chloride is a NADPH-diaphorase substrate that competitively inhibits nitric oxide synthase (IC50 = 3-4 M). A well-known scavenger of superoxide anions.Nitro blue tetrazolium chloride, a substrate for dehydrogenases, is used with the alkaline phosphatase substrate BCIP in western blotting and immunohistological staining procedures.
