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Effects of dietary fibre and tannins from apple pulp on the composition of faeces in rats

Published online by Cambridge University Press:  09 March 2007

L. Bravo ,
F. Saura-Calixto  and
I. Goni
L. Bravo
Affiliation:
Instituto de Nutricion y Bromatologia, CSIC-UCM, Facultad de Farmacia, Universidad Complutense, 28040 Madrid, Spain
F. Saura-Calixto
Affiliation:
Instituto de Nutricion y Bromatologia, CSIC-UCM, Facultad de Farmacia, Universidad Complutense, 28040 Madrid, Spain
I. Goni
Affiliation:
Instituto de Nutricion y Bromatologia, CSIC-UCM, Facultad de Farmacia, Universidad Complutense, 28040 Madrid, Spain
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Abstract

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The present study was undertaken to explore the effect of apple pulp on weight and composition of faeces. This material is rich in dietary fibre (DF;620 g dry matter/kg) and contains appreciable amounts of polyphenols. Recent reports indicate that both condensed tannins (CT) and soluble polyphenols form cross-links with protein and inhibit digestive enzymes, affecting the protein digestibility, and may produce a stimulation of endogenous nitrogen excretion. Two groups of male Wistar rats were fed on either a control diet free of DF or a diet containing 100 g apple pulp DF/kg during 7 d after a 4 d adaptation period. Body-weight and food intake were monitored daily and faeces and urine were collected once daily. DF, water content and polyphenolic compounds were measured in faeces, and N content in both faeces and urine. Faecal weight increased in the fibre group by 280 and 240% when compared with wet and dry faecal weights of animals fed on the fibre-free diet. Soluble dietary fibre (SDF) excreted in faeces was 10.9% of the SDF ingested, which suggested a low resistance to fermentation of this fraction. Of the insoluble DF, 43% of the ingested fibre was fermented. Polyphenols were degraded in the intestinal tract. Of the ingested CT, 68.6% was recovered in faeces, while the soluble polyphenols were extensively degraded (85.7% of that ingested). On the other hand, a higher faecal N excretion was observed for the fibre-fed group, suggesting a decrease in the digestibility of the dietary protein and lower apparent digestibility and N balance indices.

Keywords

Apple pulpDietary fibreFaeces compositionPolyphenols
Type
Effects of Complex Carbohydrates in the Large Bowel
Information
British Journal of Nutrition , Volume 67 , Issue 3 , May 1992 , pp. 463 - 473
Copyright
Copyright © The Nutrition Society 1992

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