Time-resolved EPR study on photoreduction of sodium anthraquinone-2-sulfate in liposomes

Shinya Moribe, Tadaaki Ikoma, Kimio Akiyama, Shozo Tero-Kubota

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Laser pulse photolysis of amphiphilic anthraquinone-2-sulfonic acid (2-AQS) in liposome buffer solution shows transient electron spin polarization consisting of a net emissive polarization attributable to hydrogen abstraction in a lipid bilayer and a net absorptive pattern caused by electron transfer via the triplet exciplex 3(2-AQS--Cl-)* in an aqueous phase. The diffusion rate of the neutral semiquinone radical from the interior of the lipid bilayer to a bulk water region is determined to be 7 × 105 s-1, suggesting that the rate is slower compared with the micellar system.

Original languageEnglish
Pages (from-to)66-68
Number of pages3
JournalChemical Physics Letters
Volume457
Issue number1-3
DOIs
Publication statusPublished - 2008 May 20

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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