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. 2016 Oct 1;208:177-84.
doi: 10.1016/j.foodchem.2016.03.116. Epub 2016 Apr 1.

Assessment of Flavanol Stereoisomers and Caffeine and Theobromine Content in Commercial Chocolates

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Assessment of Flavanol Stereoisomers and Caffeine and Theobromine Content in Commercial Chocolates

M E Alañón et al. Food Chem. .

Abstract

Assessment of the flavanol composition of 41 commercial chocolates was by HPLC-DAD. Among individual flavonols ranged from 0.095 to 3.264mgg(-1), epicatechin was the predominant flavanol accounting for 32.9%. Contrary to catechin, epicatechin was a reliable predictive value of the polyphenol content. Conversely the percentage of theobromine used as a proxy measure for nonfat cocoa solids (NFCS) was not a good predictor of epicatechin or flavanol content. In a further chiral analysis, the naturally occurring forms of cocoa flavanols, (-)-epicatechin and (+)-catechin, was determined joint the occurrence of (+)-epicatechin and (-)-catechin due to the epimerization reactions produced in chocolate manufacture. (-)-Epicatechin, the most bioactive compound and predominant form accounted of 93%. However, no positive correlation was found with% cocoa solids, the most significant quality parameter.

Keywords: Catechin; Chocolate; Epicatechin; Flavanols; Methylxanthines; Stereoisomers.

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