Free Radical Mediated Oxidative Degradation of Carotenes and Xanthophylls

Mordi, Raphael C. and Ademosun, Olabisi Theresa and Ajanaku, C. O. and Olanrewaju, I. O. and Walton, John C. (2020) Free Radical Mediated Oxidative Degradation of Carotenes and Xanthophylls. Molecules, 25.

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Abstract

This article reviews the excited-state quenching, pro-vitamin A activity and anticarcinogenicity of carotenes and xanthophylls in relation to their chemical structures. Excited-state quenching improved with the length of the conjugated chain structure. Pro-vitamin A activity was dependent on the presence of at least one beta-ionyl ring structure. The e�ectiveness of carotenoids as antioxidants depended on their ability to trap peroxyl radicals with production of resonance-stabilized carotenyl radicals. The products identified from oxidations of carotenes and xanthophylls with molecular oxygen and other oxidizing agents are presented. The free radical-mediated mechanisms that have been proposed to account for the di�erent classes of products are reviewed.

Item Type:	Article
Uncontrolled Keywords:	free radicals; carotenoids; xanthophylls; oxidation; �-carotene; canthaxanthin; �-ionone; retinal; apo-carotenoids
Subjects:	Q Science > Q Science (General) Q Science > QD Chemistry
Divisions:	Faculty of Engineering, Science and Mathematics > School of Chemistry
Depositing User:	Mrs Patricia Nwokealisi
Date Deposited:	04 Jun 2021 15:38
Last Modified:	04 Jun 2021 15:38
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/14350

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