Document Detail

Polyphenols in foods are more complex than often thought.
MedLine Citation:
PMID:  15640485     Owner:  NLM     Status:  MEDLINE    
Dietary polyphenols show a great diversity of structures, ranging from rather simple molecules (monomers and oligomers) to polymers. Higher-molecular-weight structures (with molecular weights of > 500) are usually designated as tannins, which refers to their ability to interact with proteins. Among them, condensed tannins (proanthocyanidins) are particularly important because of their wide distribution in plants and their contributions to major food qualities. All phenolic compounds are highly unstable and rapidly transformed into various reaction products when the plant cells are damaged (for instance, during food processing), thus adding to the complexity of dietary polyphenol composition. The polyphenol composition of plant-derived foods and beverages depends on that of the raw material used but also on the extraction process and subsequent biochemical and chemical reactions of plant polyphenols. The occurrence of specific tannin-like compounds (ie, thearubigins and theaflavins) arising from enzymatic oxidation is well documented in black tea. Various chemical reactions involving anthocyanins and/or flavanols have been demonstrated to occur during red wine aging. Current knowledge regarding the reaction mechanisms involved in some of these processes and the structures of the resulting products is reviewed. Their effects on organoleptic and nutritional quality are also discussed.
Véronique Cheynier
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  The American journal of clinical nutrition     Volume:  81     ISSN:  0002-9165     ISO Abbreviation:  Am. J. Clin. Nutr.     Publication Date:  2005 Jan 
Date Detail:
Created Date:  2005-01-10     Completed Date:  2005-02-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0376027     Medline TA:  Am J Clin Nutr     Country:  United States    
Other Details:
Languages:  eng     Pagination:  223S-229S     Citation Subset:  AIM; IM    
INRA-Unité Mixte de Recherche Sciences Pour l'Cenologie, Montpellier, France.
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MeSH Terms
Flavonoids / analysis,  chemistry*
Food Analysis
Phenols / analysis,  chemistry*
Plant Extracts / analysis,  chemistry*
Reg. No./Substance:
0/Flavonoids; 0/Phenols; 0/Plant Extracts; 0/polyphenols

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