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Sunday, May 26, 2013

Quercetin and daidzein β-apo-14'-carotenoic acid esters as membrane antioxidants

Posted by Chantel Martiromo. research contributed by PubMed

Abstract Esterification by β-apo-14'-carotenoic acid was found to have opposite effects on antioxidant activity of quercetin (at B4', B3' hydroxyl) as of daidzein (at A7 hydroxyl) in phosphatidylcholine liposomes. According to the study by the Renmin University of China, posted in PubMed, found that
BDE, for (weakest) hydrogen-oxygen phenolic bond in daidzein from 368.4 kJ·mol(- 1) to 367.7 kJ·mol(- 1) compared to a significant increase in quercetin from 329.5 kJ·mol(- 1) to 356.6 kJ·mol(- 1) upon derivatization. These opposite changes in tendency for hydrogen atom transfer from phenolic groups to lipid radicals combined with an increase in A-to-B dihedral angle from 0.0° to 36.4° and in dipole moment from 0.40 D to 6.01 D for quercetin upon derivatization, while less significant for daidzein (36.4°-36.7° and 3.26 D-7.87 D, respectively), together provide a rationale for the opposite effect of esterification on antioxidation.

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