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Simultaneous electrochemical and electron paramagnetic resonance studies of keto and hydroxy carotenoids

✍ Scribed by A.S. Jeevarajan; M. Khaled; L.D. Kispert

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
549 KB
Volume
225
Category
Article
ISSN
0009-2614

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✦ Synopsis

Cyclic voltammogram (CV) and simultaneous electrochemical and electron pammagnetic resonance (SEEPR) measurements have been carried out on the oxygenated carotenoids: echinenone, canthaxanthin, isozeaxanthin and rhodoxanthin in dichloromethane. The CV displays are markedly different from that of g-carotene. Comproportionation constants, deduced from EPR spin concentration measurements of electrochemically oxidized dihydroxy &carotene and several keto carotenoids vary by four orders of magnitude. A& values deduced from the SEEPR spectra of the cation radicals are in the range 13.2 to 14.5 G and the g-factors are 2.0027 _+ 0.0002. These EPR parameters are in accordance with a polyene n-cation radical structure. Theoretical CVs are calculated using DigiSim, a CV simulation program, and the proposed mechanism involves three electrode and two homogeneous reactions.

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