Free radical mediated oxidative degradation of carotenes and xanthophylls
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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 effectiveness 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 different classes of products are reviewed.
Mordi , R C , Ademosun , O T , Ajanaku , C O , Olanrewaju , I O & Walton , J C 2020 , ' Free radical mediated oxidative degradation of carotenes and xanthophylls ' , Molecules , vol. 25 , no. 5 , 1038 . https://doi.org/10.3390/molecules25051038
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