Analysis of ferrylHb radical reduction by L-tyrosine and its application to hemoglobin vesicles

Tomovasu Atoji*, Hirotaka Yatami, Motonari Aihara, Eishun Tsuchida, Shinji Takeoka

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review


We found that a mixed solution of methemoglobin (metHb) and L-tyrosine (L-Tyr) showed an effective H2O2 elimination ability by utilizing the peroxidase activity of metHb using L-Tyr as a substrate. The rapid radical disappearance and the appearance of metHb signal by L-Tyr addition were confirmed in the ESR measurement. In the mechanism, ferrylHb radicals are reduced to metHb by the electron donation from L-Tyr. From these results, stable H2O2 elimination by metHb/L-Tyr mixed solution would be due to the combination of peroxidase and pseudo-catalase activity of ferrylHb radicals. Furthermore, in the application to the Hb vesicles co-encapsulating metHb/L-Tyr, the 50 % metHb conversion from oxyHb in the vesicles was prolonged to 44 hr from 14hr of the Hb vesicles without metHb/L-Tyr.

Original languageEnglish
Number of pages1
Publication statusPublished - 2006 Oct 19
Event55th SPSJ Annual Meeting - Nagoya, Japan
Duration: 2006 May 242006 May 26


Conference55th SPSJ Annual Meeting


  • FerrylHb radical
  • Hemoglobin vesicles
  • L-Tyr
  • Methb
  • Peroxidase activity

ASJC Scopus subject areas

  • Engineering(all)


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