Abstract
Diamine oxidase or its substrates can be measured using a coupled reaction with peroxidase and the chromogen 3-methyl-2-benzothiazolone hydrazone (MBTH) with an appropriate acceptor such as 3-(dimethylamino)benzoic acid (DMAB). This method provides a more rapid and sensitive method of measuring histamine than current colorimetric assays; using this system, histamine was quantitated at concentrations of 10 to 400 μmol/l. TheK m of DAO was determined to be 2.9×10−5 M, a lower value than previously reported.
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Stoner, P. An improved spectrophotometric assay for histamine and diamine oxidase (DAO) activity. Agents and Actions 17, 5–9 (1985). https://doi.org/10.1007/BF01966672
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DOI: https://doi.org/10.1007/BF01966672