期刊
BRITISH JOURNAL OF NUTRITION
卷 108, 期 2, 页码 290-297出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0007114511005678
关键词
Bioavailability; MS; Non-extractable proanthocyanidins; Polyphenols
资金
- Spanish Ministry of Education and Science [AGL2009-12374-C03-03/ALI]
- Spanish Ministry of Science and Innovation [CD09/00068]
The non-extractable fraction of many fruit and vegetables contains putatively bioactive polyphenolic compounds that, in most cases, have not been well characterised structurally. Non-extractable proanthocyanidins (NEPA) of a polymeric nature are part of the dietary fibre fraction of food. Using liquid chromatography coupled to a mass spectrometer equipped with an electrospray ionisation chamber and a triple quadrupole mass analyser for tandem analysis (HPLC-ESI-QqQ-MS/MS) techniques, we examine the phenolic metabolites present in urine and faeces from rats 24 h after ingestion of an NEPA-rich fraction. We show that NEPA are partially depolymerised during their transit along the intestinal tract, as evidenced by the presence of (epi) catechin (EC) monomers and dimers in faeces and phase II conjugates of EC in urine. Moreover, NEPA are further metabolised by the intestinal microbiota into smaller metabolites including phenolic acids that are present in urine as both free phenolics and conjugates with glucuronate or sulphate moieties. For the first time, we report evidence that NEPA behave in vivo as a source of phenolics that are released progressively and deliver phenolic species that come into contact with the intestinal walls and are bioavailable for at least 24 h after ingestion.
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