Studies on the Singlet Oxygen Scavenging Mechanism of Human Macular Pigment

Overview

Journal Arch Biochem Biophys

Publisher Elsevier

Specialties Biochemistry
Biophysics

Date 2010 Aug 4

PMID 20678467

Citations 60

Authors

Binxing Li

Faisal Ahmed

Paul S Bernstein

Affiliations

Soon will be listed here.

Abstract

It is thought that direct quenching of singlet oxygen and scavenging free radicals by macular pigment carotenoids is a major mechanism for their beneficial effects against light-induced oxidative stress. Corresponding data from human tissue remains unavailable, however. In the studies reported here, electron paramagnetic resonance (EPR) spectroscopy was used to measure light-induced singlet oxygen generation in post-mortem human macula and retinal pigment epithelium/choroid (RPE/choroid). Under white-light illumination, production of singlet oxygen was detected in RPE/choroid but not in macular tissue, and we show that exogenously added macular carotenoids can quench RPE/choroid singlet oxygen. When the singlet oxygen quenching ability of the macular carotenoids was investigated in solution, it was shown that a mixture of meso-zeaxanthin, zeaxanthin, and lutein in a ratio of 1:1:1 can quench more singlet oxygen than the individual carotenoids at the same total concentration.

Citing Articles

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