Abstract
PurposeThe objective of this study was to establish the composition of polyphenolic preparations obtained from industrial strawberry pomace with two methods of extraction: the water and the water-alcoholic one and then to analyse their effects in the gastrointestinal tract depending on the composition of dietary fibre—cellulose or fructooligosaccharides (FOS).MethodsFreeze-dried water extract (PTW), containing 5.1 % of ellagic acid, 0.2 % of proanthocyanidins, and soluble carbohydrates as a major part, and water–alcohol extract (PTE), containing 17.1 % of ellagic acid and 10.9 % of proanthocyanidins, were administered, in the equivalent quantity of 0.06 % of ellagic acid, to 4- to 8-week-old rats (8 animals per group), as a component of modified AIN-93 diets containing 5 % of cellulose or FOS.ResultsThe addition of strawberry pomace extracts had no effect on either the diet intake or the body weight of experimental rats. Both extracts, similarly to FOS, beneficially reduced the activity of β-glucuronidase in caecal digesta, with the PTW effect being significantly higher than that of PTE (7.59 vs. 9.20 μmol/h/g, P = 0.001). In comparison with PTE, the PTW extract significantly increased the caecal digesta mass (1.45 vs. 1.27 k/kg BW) and the total production of SCFA (86.1 vs. 71.4 μmol/100 g BW). The extract enhanced the physiological effect of FOS by inhibiting the activity of β-glucuronidase, increasing the caecal digesta mass and SCFA production. Such an effect was not recorded in the case of the PTE preparation.ConclusionsThe addition of strawberry pomace extracts affected the activity of certain enzymes of intestinal microflora and its most important products.
Highlights
One of the important elements of health prophylaxis in economically developed countries is the increase in the consumption of vegetables and fruit being the source of biologically active dietary components that have a beneficial influence on human health [1]
Purpose The objective of this study was to establish the composition of polyphenolic preparations obtained from industrial strawberry pomace with two methods of extraction: the water and the water-alcoholic one and to analyse their effects in the gastrointestinal tract depending on the composition of dietary fibre—cellulose or fructooligosaccharides (FOS)
The extract enhanced the physiological effect of FOS by inhibiting the activity of b-glucuronidase, increasing the caecal digesta mass and SCFA production
Summary
One of the important elements of health prophylaxis in economically developed countries is the increase in the consumption of vegetables and fruit being the source of biologically active dietary components that have a beneficial influence on human health [1]. In a number of countries, the harvest season of strawberry is short and during the industrial production of juices a considerable amount of biologically active components remains in fruit pomace. This still underestimated byproduct may constitute a source of health-promoting substances, dietary fibre and polyphenols [3, 4]. One of the possibilities is to use strawberry seeds (achenes) in the production of gluten-free bread with an increased content of dietary fibre and polyphenols [5]. Due to the application of enzymes degrading polysaccharides of the cell walls of the processed fruit, the composition of polyphenols may differ from that of fruit, and these compounds may be more extracted with various solvents [7, 8]
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