Stability of Nitroblue Tetrazolium-based Alkaline Phosphatase SubstratesGary B. Smejkala and Charles A. Kaulba Cleveland Clinic Foundation, Department of Clinical Pathology, Cleveland, Ohio b Lerner Research Institute, Department of Cell Biology, Cleveland, Ohio Correspondence to: Gary B. Smejkal, Proteome Systems, Inc., 14 Gill Street, Woburn, MA 01801. E-mail: gary.smejkal@proteomesystems.com This report demonstrates the stability of NBT substrate after multiple exposures to alkaline phosphatase. Perhaps more important than the ability to reuse substrates, the report provides some insight into the mechanisms by which tetrazoliums are reduced and evidence for the formation of an intermediary product, i.e., a half-formazan that is reduced more rapidly. (J Histochem Cytochem 49:11891190, 2001) Key Words: alkaline phosphatase, 5-bromo-4-chloro-3-indolyl, phosphate, formazan, nitroblue tetrazolium chloride, von Willebrand factor, Western blotting
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