Add time:07/15/2019         Source:sciencedirect.com

Photo-oxidation of vitamin A with UV light gave retinal and a mixture of epoxy derivatives of the vitamin; however, vitamin A palmitate gave anhydrovitamin A and fragments derived from cleavage of the side-chain double bonds. The rate of oxidation and the type of oxidation products produced by photosensitized oxidation of Vitamin A and its palmitate ester with visible light depended on the sensitizer. The vitamin gave epoxides, peroxides and cleavage products, while the palmitate gave mainly cleavage products. Some of the oxidation products were isolated and identified; many others were too unstable and decomposed during work-up. The photosensitized processes are considered to be initiated by singlet oxygen.

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