Sensitive colorimetric assay of serum diamine oxidase

Clin Chim Acta. 1994 Apr;226(1):67-75. doi: 10.1016/0009-8981(94)90103-1.

Abstract

A simple and sensitive colorimetric assay for serum diamine oxidase (DAO) activity was based on a coupled reaction with peroxidase and a new chromogen, 10-(carboxymethyl-aminocarbonyl)-3,7-bis(dimethylamino) phenothiazine sodium salt (DA-67). In the presence of peroxidase and DA-67, peroxidase catalyzes the formation of methylene blue having an absorption maximum at 668 nm. The proposed method eliminates the interferences occurring in serum with use of ascorbate oxidase and stops the reaction with sodium diethyldithiocarbamate, leaving the methylene blue in the reaction mixture stable for about 2 h. Low normal basal values of serum DAO can be determined in the range 2.8-9.0 units/l. Since all reagents are commercially available the method is suitable for the clinical laboratory.

MeSH terms

  • Adolescent
  • Adult
  • Amine Oxidase (Copper-Containing) / blood*
  • Cadaverine / chemistry*
  • Colorimetry / methods*
  • Humans
  • Methylene Blue / chemistry
  • Peroxidase / chemistry
  • Sensitivity and Specificity
  • Spectrophotometry

Substances

  • Peroxidase
  • Amine Oxidase (Copper-Containing)
  • Cadaverine
  • Methylene Blue