Document Detail

Colonic metabolism of polyphenols from coffee, green tea, and hazelnut skins.
MedLine Citation:
PMID:  22955368     Owner:  NLM     Status:  In-Data-Review    
Dietary polyphenolic compounds are poorly absorbed in the small intestine. The absorbed fraction follows the common metabolic pathway of drugs, undergoing phase II enzymatic detoxification with the conjugation of glucuronic acid, sulfate, and methyl groups. However, the unabsorbed fraction can reach the colon, becoming available for the wide array of enzymes produced by the local commensal microbiota. Gut bacteria can hydrolyze glycosides, glucuronides, sulfates, amides, esters, and lactones and are able to break down the polyphenolic skeleton and perform reactions of reduction, decarboxylation, demethylation, and dehydroxylation. These complex modifications generate several low-molecular-weight metabolites that can be efficiently absorbed in situ, subsequently undergoing further phase II metabolism, locally and/or at the liver level, before entering the systemic blood circulation and finally being excreted in urine in substantial quantities that exceed the excretion of phenolic metabolites formed in the upper gastrointestinal tract. This brief work focuses on the phenolic composition and colonic microbial transformation of 2 of the most polyphenol-rich dietary sources, namely, green tea and coffee, and a new interesting and innovative ingredient, hazelnut skin, recently evaluated as one of the richest edible sources of polyphenolic compounds.
Luca Calani; Margherita Dall'asta; Eleonora Derlindati; Francesca Scazzina; Renato Bruni; Daniele Del Rio
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of clinical gastroenterology     Volume:  46 Suppl     ISSN:  1539-2031     ISO Abbreviation:  J. Clin. Gastroenterol.     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-09-07     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7910017     Medline TA:  J Clin Gastroenterol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  S95-9     Citation Subset:  IM    
*The φ2 Laboratory of Phytochemicals in Physiology, Human Nutrition Unit, Department of Public Health †Department of Internal Medicine and Biomedical Science ‡Department of Functional and Evolutionary Biology, University of Parma, Parma, Italy.
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