Pulsed EPR and DFT characterization of radicals produced by photo-oxidation of zeaxanthin and violaxanthin on silica-alumina

Article Abstract:

Pulsed electron nuclear double resonance (ENDOR) and two-dimensional (2D)-hyperfine sublevel correlation spectroscopy (HYSCORE) are used for characterizing carotenoid radicals of zeaxanthin and violaxanthin photogenerated on silica-alumina. The formation of neutral radical of zeaxanthin has provided an effective nonphotochemical quencher of the excited state of chlorophyll for photoreaction in the presence of excess light.

Analysis, Spectra, Oxidation-reduction reaction, Oxidation-reduction reactions, Electron paramagnetic resonance spectroscopy, Structure, Isomerism, Isomers (Chemistry)

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Detection of anisotropic hyperfine components of chemically prepared carotenoid radical cations: 1D and 2D ESEEM and pulsed ENDOR study

Article Abstract:

Canthaxanthin and 8' -apo-beta-caroten-8' -al radical cations chemically prepared on activated silica-alumina and in CH2Cl2 solution containing AlCl3 are studied by pulsed EPR and electron nuclear double resonance (ENDOR).

Chemistry, Physical and theoretical, Physical chemistry, Radicals (Chemistry)

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Isomerization of carotenoids in the presence of MCM-41 molecular sieves: EPR and HPLC studies

Article Abstract:

High isomerization efficiency of Car embedded in MCM-41 can be obtained by oxidation or photoexcitation. The study gives an insight into the isomerization behavior of carotenoids in photosystem II.

All Other Basic Organic Chemical Manufacturing, Industrial organic chemicals, not elsewhere classified, Molecular Sieves, Isomerization

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