Abstract
Consumption of polyphenols and dietary fiber as part of a normal diet is beneficial to human health. In this study, we examined whether different amounts of dietary soluble fiber (pectin) affect the absorption and metabolism of polyphenols from blackcurrant and green tea in rats. After 28 days, the rats fed blackcurrant and green tea with pectin (4 or 8%) had significantly lower body weight gain and food intake compared to the rats fed a control diet. Rats fed a blackcurrant and green tea diet with 8% pectin had significantly higher fecal nitrogen output and lower protein digestibility. No polyphenols were observed in the urine, feces and plasma of rats fed the control diet. Parent catechins and flavonols were absent in urine obtained from all diet groups. Gallocatechin glucuronide was only observed in the plasma of rats fed the blackcurrant and green tea diet without pectin. Meanwhile, epicatechin and catechin gallate were present in the feces of rats fed a blackcurrant and green tea diet with and without 4% pectin. Pectin (4 or 8%) added to the blackcurrant and green tea diet increased the plasma antioxidant capacity in rats. Inclusion of pectin in the diet altered the host absorption and metabolism of polyphenols from blackcurrant and green tea.
Highlights
Polyphenols found in fruit and vegetables offer numerous health benefits, including protection against cardiovascular disease [1]
We investigated the effects of soluble fiber on the absorption and metabolism of dietary nitrogen and the polyphenols from blackcurrant and green tea in rats
Dichlorofluorescein was oxidized by radicals that were generated by thermal decomposition of 2,20 -azobis (2-amidinopropane) dihydrochloride (AAPH) in an aqueous medium
Summary
Polyphenols found in fruit and vegetables offer numerous health benefits, including protection against cardiovascular disease [1]. In an earlier study in rats fed a diet with fermentable fiber and blackcurrant, we observed synergistic health benefits greater than those of the individual components [8]. In vivo effects of dietary fiber on the bioavailability of polyphenols from blackcurrant and green tea remain largely unknown. Understanding the association between dietary fiber and polyphenols when consumed as part of a diet can give new insights into the complex processes that occur in the gut and, most importantly, this information can be used to inform food choices, with positive health benefits. We investigated the effects of soluble fiber (pectin) on the absorption and metabolism of dietary nitrogen and the polyphenols from blackcurrant and green tea in rats. Corticosterone and uric acid were examined in rats fed the experimental diets
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