In vitro bioaccessibility and gut biotransformation of polyphenols present in the water-insoluble cocoa fraction - PubMed (original) (raw)

. 2011 May:55 Suppl 1:S44-55.

doi: 10.1002/mnfr.201000360. Epub 2011 Feb 3.

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In vitro bioaccessibility and gut biotransformation of polyphenols present in the water-insoluble cocoa fraction

Vincenzo Fogliano et al. Mol Nutr Food Res. 2011 May.

Abstract

Scope: Cocoa, especially the water-insoluble cocoa fraction (WICF), is a rich source of polyphenols. In this study, sequential in vitro digestion of the WICF with gastrointestinal enzymes as well as its bacterial fermentation in a human colonic model system were carried out to investigate bioaccessibility and biotransformation of WICF polyphenols, respectively.

Methods and results: The yield of each enzymatic digestion step and the total antioxidant capacity (TAC) were measured and solubilized phenols were characterized by MS/MS. Fermentation of WICF and the effect on the gut microbiota, SCFA production and metabolism of polyphenols was analyzed. In vitro digestion solubilized 38.6% of WICF with pronase and Viscozyme L treatments releasing 51% of the total phenols from the insoluble material. This release of phenols does not determine a reduction in the total antioxidant capacity of the digestion-resistant material. In the colonic model WICF significantly increased of bifidobacteria and lactobacilli as well as butyrate production. Flavanols were converted into phenolic acids by the microbiota following a concentration gradient resulting in high concentrations of 3-hydroxyphenylpropionic acid (3-HPP) in the last gut compartment.

Conclusion: Data showed that WICF may exert antioxidant action through the gastrointestinal tract despite its polyphenols being still bound to macromolecules and having prebiotic activity.

Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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