Application of an in vitro digestion model to study the bioaccessibility and the effect of the intestinal microbiota on the red wine proanthocyanidins
Proanthocyanidins are important phenolic fraction for wine quality, contributing to astringency, bitterness and color. Their metabolism begins in the mouth and continues throughout the gastrointestinal tract; however, most of them are accumulated in the colon where are metabolized by the intestinal microbiota, giving rise to a whole series of phenolic acids that may have greater activity at physiological level than the precursors. This study aimed to evaluate in vitrothe bioaccessibility of proanthocyanidins in a red wine developed by Bodegas Pradorey, as well as to evaluate the potential effect of intestinal microbiota on polyphenols metabolism identifying and quantifying secondary metabolites. The evaluation of the effects of the intestinal microbiota was carried out using an in vitro Digester of Colonic Fermentation. The fecal microbiota was inoculated, and 100 mL of red wine was added daily for 14 days. For the determination of proanthocyanidins and phenolic metabolites, related, high performance liquid chromatography coupled with mass spectrometry (UHPLC-QqQ-MS/MS) was used. The major phenolic metabolites detected were propionic and acetic acid, and the highest concentrations were detected in the transverse and descending colon, mainly at the end of fermentation process. On the other hand, the main families of microbial proanthocyanidin metabolites detected were valerolactones and benzoic acids mainly between 10-14 days of wine fermentation.
Acknowledgements: IDI-20210434 project. S Yuste has a Margarita Salas postdoctoral grant (funded by the European Union – NextGenerationEU).
1) Manach C, Scalbert A, Morand C, Rémésy C, Jiménez L. Polyphenols: food sources and bioavailability. Am J Clin Nutr. 2004 May;79(5):727-47.
Issue: ICGWS 2023
1Instituto de Ciencias de la Vid y el Vino-ICVV (CSIC, UR, GR) 26007 Logroño, Spain
2Antioxidants Research Group, Food Technology Department, Agrotecnio-RECERCA Center, University of Lleida, 25198 Lleida, Spain
3 Ainia. Technological Park of Valencia, Paterna (Valencia), Spain
4 Real Sitio de Ventosilla SA. Gumiel de Mercado, Burgos, Spain
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proanthocyanidins, bioaccessibility, intestinal microbiota, wine, UHPLC-QqQ-MS/MS