Phenolic sulfates as new and highly abundant metabolites in human plasma after ingestion of a mixed berry fruit puree

卷:113

Pimpao, Rui C. ; Ventura, M. Rita ; Ferreira, Ricardo B. ; Williamson, Gary ; Santos, Claudia N.

Univ Nova Lisboa

关键词: Berry fruits;    Bioavailability;    Polyphenols;    Conjugates;    Sulfates;   

DOI  :  10.1017/S0007114514003511

学科分类：食品科学和技术

【 摘 要 】

Bioavailability studies are vital to assess the potential impact of bioactive compounds on human health. Although conjugated phenolic metabolites derived from colonic metabolism have been identified in the urine, the quantification and appearance of these compounds in plasma is less well studied. In this regard, it is important to further assess their potential biological activity in vivo. To address this gap, a cross-over intervention study with a mixed fruit puree (blueberry, blackberry, raspberry, strawberry tree fruit and Portuguese crowberry) and a standard polyphenol-free meal was conducted in thirteen volunteers (ten females and three males), who received each test meal once, and plasma metabolites were identified by HPLC-MS/MS. Sulfated compounds were chemically synthesised and used as standards to facilitate quantification. Gallic and caffeic acid conjugates were absorbed rapidly, reaching a maximum concentration between 1 and 2 h. The concentrations of sulfated metabolites resulting from the colonic degradation of more complex polyphenols increased in plasma from 4 h, and pyrogallol sulfate and catechol sulfate reached concentrations ranging from 5 to 20 mu M at 6 h. In conclusion, phenolic sulfates reached high concentrations in plasma, as opposed to their undetected parent compounds. These compounds have potential use as biomarkers of polyphenol intake, and their biological activities need to be considered.