Decolorization of azo and anthraquinone dyes in hydrophobic organic media using microperoxidase-11 entrapped in reversed micelles

Shin Ya Okazaki, Shin Ichiro Nagasawa, Masahiro Goto, Shintaro Furusaki, Hiroyuki Wariishi, Hiroo Tanaka

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Microperoxidase-11 (MP-11), which is a heme-containing undecapeptide derived from horse heart cytochrome c, was utilized as a peroxidative catalyst in the system of bis(2-ethylhexyl)sulphosuccinate sodium salt (AOT)-reversed micelles to oxidatively decolorize water-insoluble dyes in isooctane. MP-11 entrapped in the reversed micelles exhibited a peroxidative activity in the presence of H2O2, effectively catalyzing the oxidative decolorization of an azo dye Solvent Yellow 7 and an anthraquinone dye Solvent Blue 11 in the hydrophobic organic solvent. H2O2-derived heme bleaching was successfully suppressed by replacing H2O2 with an organic hydroperoxide, tert-butyl hydroperoxide (t-BuOOH), thus sustaining a stable decolorization activity in the system. To optimize the reversed micellar system, the effect of the pH and the molar ratio of H2O/AOT hydration degree (Wo) was examined, indicating that MP-11 exhibited a maximal decolorization activity at pH 8-10 with the Wo value of 20.

Original languageEnglish
Pages (from-to)237-241
Number of pages5
JournalBiochemical Engineering Journal
Volume12
Issue number3
DOIs
Publication statusPublished - Dec 1 2002

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Environmental Engineering
  • Bioengineering
  • Biomedical Engineering

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