Biochemistry (Moscow)

, Volume 70, Issue 1, pp 92–99 | Cite as

Identification of intermediate and product from methemoglobin-catalyzed oxidation of o-phenylenediamine in two-phase aqueous—organic system

  • De-Jia Li
  • Xi-Wen Li
  • Yu-Xiang Xie
  • Xiao-Qiang Cai
  • Guo-Lin Zou


Methemoglobin (metHb) was used as a mimetic enzyme for peroxidase to catalyze the oxidation reaction of o-phenylenediamine (OPDA) with H2O2 functioning as an oxidant. A reaction intermediate was obtained in two-phase aqueous-organic system and an absorption peak at 710 nm was confirmed to be that of the intermediate in relation to OPDA. The isolated product and intermediate were characterized by UV-V is and IR spectrophotometry and HPLC-tandem mass spectrometry. The results showed that the product is 2,3-diaminophenazine, the molecular mass of the intermediate is 212 daltons, and a conceivable structure of the intermediate is suggested. Combining the catalyzed reaction mechanism of peroxidase and our experimental results, a conceivable oxidation reaction mechanism of OPDA and H2O2 using metHb as catalyst is proposed.

Key words

hemoglobin o-phenylenediamine intermediate reaction mechanism 









horseradish peroxidase


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Copyright information

© MAIK “Nauka/Interperiodica” 2005

Authors and Affiliations

  • De-Jia Li
    • 1
  • Xi-Wen Li
    • 1
  • Yu-Xiang Xie
    • 1
  • Xiao-Qiang Cai
    • 1
  • Guo-Lin Zou
    • 1
  1. 1.College of Life SciencesWuhan UniversityWuhan, HubeiPR China

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