Electrochemical properties of natural carotenoids

Carotenoids are widely distributed among plants, certain bacteria and animals, serving for light harvesting and photoprotection in photosynthesis and as antioxidants. Electrochemical data (such as oxidation potentials, reaction rate constants, kinetic equilibrium constants) for 12 naturally occurrin...

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Published inJournal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 488; no. 2; pp. 140 - 150
Main Authors Liu, Dezhong, Gao, Yunlong, Kispert, Lowell D.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 14.07.2000
Elsevier Science
Subjects
Carotenoid
Chemistry
Electrochemistry
Exact sciences and technology
General and physical chemistry
Kinetics and mechanism of reactions
Oxidation potential
Voltammetry
Electrochemistry
Voltammetry
Oxidation potential
Carotenoid
Cyclic voltammetry
Organic pigment
Electrochemical properties
Natural product
Oxidation
Property structure relationship
Experimental study
Electrochemical reaction
Square wave
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Summary:Carotenoids are widely distributed among plants, certain bacteria and animals, serving for light harvesting and photoprotection in photosynthesis and as antioxidants. Electrochemical data (such as oxidation potentials, reaction rate constants, kinetic equilibrium constants) for 12 naturally occurring carotenoids are summarized in this paper. Electrochemical parameters were estimated by simulating experimental cyclic voltammograms (CVs). Conventional electrochemical techniques (cyclic voltammetry and Osteryoung square-wave voltammetry) were used in these studies. CVs of some natural carotenoids are presented and discussed. The dependence of redox potentials and other kinetic parameters on the structures of carotenoids is summarized. The oxidation potential of neutral carotenoid ( E° 1), which corresponds to the formation of cation radicals, varies from 0.50 to 0.72 V versus SCE. The oxidation potential of carotenoid cation radical ( E° 2), which corresponds to the formation of a dication, usually lies in the region of 0.52–0.95 V versus SCE. The electrochemical data presented in this article should be helpful in the study of reaction processes in model systems or actual photosynthesis reaction centers.
ISSN:1572-6657
1873-2569
DOI:10.1016/S0022-0728(00)00205-9