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Short-chain fatty acid formation in the hindgut of rats fed native and fermented oat fibre concentrates

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Author

Summary, in English

The formation of SCFA in rats fed fermented oat fibre concentrates was compared with that of rats fed native oat fibre concentrate. The cultures used were lactic acid bacteria consisting of Lactobacillus bulgaricus and Streptococcus thermophilus (V2), the exopolysaccharide-producing strain Pediococcus damnosus 2.6 (Pd) and L. reuteri (Lr). The materials were incorporated into test diets yielding a concentration of indigestible carbohydrates of 80 g/kg (dry weight). Rats fed the V2-fermented fibre-concentrate diet yielded higher caecal and distal concentrations of acetic acid (P < 0 center dot 01) than rats fed the native fibre concentrate. All the fermented fibre concentrates resulted in a higher propionic acid concentration in the distal colon (P < 0 center dot 05), while rats fed Pd-fermented fibre concentrate resulted in lower concentration of butyric acid (P < 0 center dot 05, P < 0 center dot 01) in all parts of the hindgut as compared with rats fed the native fibre concentrates. Butyrate concentrations ranged between 5-11 mu mol/g (distal colon) and 6-8 mu mol/g (13 d faeces). Higher proportions of acetic acid (P < 0 center dot 05; P < 0 center dot 01) were observed in the caecum of rats fed the fermented fibre concentrates. Rats fed Pd- and Lr-fermented fibre concentrates produced higher proportions of propionic acid (P < 0 center dot 05; P < 0 center dot 01) in the caecum. Changes in SCFA formation in the caecum, distal colon and faeces of rats fed the fermented samples compared with the native sample indicate that these microbes probably survive in the hindgut and that modification of the microflora composition with fermented foods is possible. This may be important for the gastrointestinal flora balance in relation to colonic diseases.

Publishing year

2006

Language

English

Pages

47-55

Publication/Series

British Journal of Nutrition

Volume

96

Issue

1

Document type

Journal article

Publisher

Cambridge University Press

Topic

  • Nutrition and Dietetics

Keywords

  • lactic acid
  • short-chain fatty acids
  • fermented oat fibre concentrate
  • bacteria
  • rat hindgut

Status

Published

ISBN/ISSN/Other

  • ISSN: 1475-2662