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The involvement of free radicals in the mechanism of -Carotene Degradation

Mordi, Raphael C. (2015) The involvement of free radicals in the mechanism of -Carotene Degradation. Covenant Journal of Physical and Life Sciences, 3 (1). pp. 26-35.

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Abstract

-Carotene, a pro-vitamin A carotenoid, was reacted with oxygen in benzene as solvent, in the dark. The products of oxidation were characterised by HPLC with a UV photodiode detector and LC-MS, EI mode. The products identified were oxygencontaining compounds of the type epoxides, aldehydes and ketones. ESR study of retinyl- and ionyl-derivatives revealed that the secondary sites C7 and C9 were the most reactive towards radical generation. Both the results of product analysis and the ESR study enabled us to propose that the products of -carotene autoxidation were obtained by a free radical mechanism involving initial formation of a biradical during the transto- cis isomerisation at the 15,15' bond and attack by oxygen.

Item Type: Article
Uncontrolled Keywords: Carotene, Carotenoids, Apo-carotenoids, ESR, Degradation, Autoxidation, Free radicals.
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: 10 May 2018 07:59
Last Modified: 10 May 2018 07:59
URI: http://eprints.covenantuniversity.edu.ng/id/eprint/10771

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