The allomerization of chlorophylls a and b with superoxide anion |
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Authors: | Mark N. Merzlyak,Vadim A. Kovrighnikh,Natalja S. Kuprianova,Igor B. Afanas ev |
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Affiliation: | Department of Cell Physiology and Immunology, Moscow State University U.S.S.R.;All-Union Vitamin Research Institute, Moscow, U.S.S.R. |
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Abstract: | The interaction of chlorophylls a and b with electrochemically prepared superoxide anion was studied in aprotic solvent. It was found that O2?·causes the deprotonation at carbon C-10 of ring V and production of chlorophyll enolate ions. The intermediate anions undergo rapid oxidation into corresponding chlorins. Pyrochlorophyll a, which lacks the C-10 carboxymethyl group, did not show the transformation. It is suggested that more strong free radical oxidants (e.g., HO2·, or RO2·) are capable of abstracting the hydrogen atom at C-10. The possible significance of free radical deprotonation and oxidation in chlorophyll allomerization is discussed. |
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Keywords: | Address reprint requests to Dr. M.N. Merzlyak Department of Cell Physiology and Immunology Faculty of Biology Moscow State University Moscow 117234 U.S.S.R.. |
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