Journal
ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS
Volume 458, Issue 2, Pages 104-110Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.abb.2006.10.008
Keywords
carotenoid; xanthophyll; one-electron reduction potential; radical
Categories
Ask authors/readers for more resources
The relative reduction potentials of a variety of carotenoids have been established by monitoring the reaction of carotenoid radical anion (CAR1(.-)) with another carotenoid (CAR2) in hexane and benzene. This order is consistent with the reactivities of the carotenoid radical anions with porphyrins and oxygen in hexane. In addition, investigation of the reactions of carotenoids with reducing radicals in aqueous 2% Triton-X 100, such as carbon dioxide radical anion (CO2.-), acetone ketyl radical (AC(.-)) and the corresponding neutral radical (ACH(.)), reveals that the reduction potentials for beta-carotene and zeaxanthin lie in the range -1950 to -2100 mV and those for astaxanthin, canthaxanthin and beta-apo-8'-carotenal are more positive than -1450 mV. This illustrates that the presence of a carbonyl group causes the reducing ability to decrease. The radical cations have been previously shown to be strong oxidising agents and we now show that the radical anions are very strong reducing agents. (c) 2006 Elsevier Inc. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available