Prebiotic effects of fermentable carbohydrate polymers may be modulated by faecal bulking of non-fermentable polysaccharides in the large bowel of rats

Autor: Cloe Erika De Guzman, Gunaranjan Paturi, Nicole C. Roy, Christine A. Butts, Wayne Young, Juliet Ansell, Andrew McLachlan, John A. Monro
Rok vydání: 2012
Předmět:
Zdroj: International Journal of Food Science & Technology. 47:968-976
ISSN: 0950-5423
DOI: 10.1111/j.1365-2621.2011.02929.x
Popis: This study investigated the impact of supplementary fermentable polysaccharides inulin (a prebiotic) and barley I²â€glucan on the large bowel, when consumed against a background high or low intake of mixed non‐starch polysaccharide. Rats were fed for 28 days with diets containing high (15%) and low (5%) background dietary fibre (BDF; cellulose plus sugar beet fibre), with or without 5% supplementary fermentable fibre (SFF; inulin or barley I²â€glucan). High‐BDF diets unsupplemented with inulin or barley I²â€glucan caused greater improvement than supplemented low‐BDF diets in several parameters linked to gut health: they increased colonic Bifidobacterium spp., butyric acid concentration in the caecum, and colonic crypt depth more than inulin and barley I²â€glucan. For these parameters, inulin and barley I²â€glucan added little to the effects of the high‐BDF diet alone. Furthermore, by allowing for dilution due to the greater faecal bulk induced by the mixed fibre compared with inulin or barley I²â€glucan, the total quantity of butyric acid in the colon of BDF‐fed rats was greatly amplified. Interpretation of the effects of prebiotics in diets containing dietary fibre requires concurrent analysis of the multiple effects of non‐fermentable bulk.
Databáze: OpenAIRE