The reduction potential of the β-carotene.+/β-carotene couple in an aqueous micro-heterogeneous environment

Ruth Edge, Edward J. Land, David J. McGarvey, Marc Burke, T. George Truscott

Research output: Contribution to journalArticlepeer-review

Abstract

There is a resurgence of interest in the role of electron transfer reactions involving β-carotene in photosynthesis. There is also current debate on the health benefits of dietary carotenoids and the possible deleterious effects on certain sub-populations such as smokers. The impact of dietary carotenoids on health may well be also related to radical reactions. A key parameter in biological systems is therefore the one-electron reduction potential of the carotenoid radical cation, now reported for the first time in a model biological aqueous environment. The value obtained is 1.06±0.01 V and is sufficiently high to oxidise cell membrane proteins, but is low enough to repair P680 .+) in the photosynthetic reaction centre. Copyright (C) 2000 Federation of European Biochemical Societies.

Original languageEnglish
Pages (from-to)125-127
Number of pages3
JournalFEBS Letters
Volume471
Issue number2-3
DOIs
Publication statusPublished - 14 Apr 2000

Keywords

  • β-Carotene
  • Cysteine
  • One-electron reduction potential
  • Tryptophan
  • Tyrosine

Research Beacons, Institutes and Platforms

  • Dalton Nuclear Institute

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