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Comparative effects of dietary wheat bran and its morphological components (aleurone and pericarp-seed coat) on volatile fatty acid concentrations in the rat

Published online by Cambridge University Press:  09 March 2007

Bing-Qin Cheng ,
Rodney P. Trimble ,
Richard J. Illman ,
Bruce A. Stone  and
David L. Topping
Bing-Qin Cheng
Affiliation:
Department of Biochemistry, La Trobe University, Bundoora, Victoria 3083, Australia
Rodney P. Trimble
Affiliation:
CSIRO (Australia) Division of Human Nutrition, Glenthorne Laboratory, Majors Road, O'Halloran Hill, South Australia 5158, Australia
Richard J. Illman
Affiliation:
CSIRO (Australia) Division of Human Nutrition, Glenthorne Laboratory, Majors Road, O'Halloran Hill, South Australia 5158, Australia
Bruce A. Stone
Affiliation:
Department of Biochemistry, La Trobe University, Bundoora, Victoria 3083, Australia
David L. Topping
Affiliation:
CSIRO (Australia) Division of Human Nutrition, Glenthorne Laboratory, Majors Road, O'Halloran Hill, South Australia 5158, Australia
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Abstract

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1. Adult male rats were fed on diets containing 100 g dietary fibre/kg either as α-cellulose or wheat bran or the pericarp-seed coat or aleurone layers prepared from that bran by sequential milling and air elutriation and electrostatic separation.

2. After 10 d, concentrations of total volatile fatty acids (VFA) in caecal fluid were significantly different between groups and fell in the order: aleurone > wheat bran > pericarp-seed coat > cellulose. This ranking probably reflected the ease of fermentation of fibre polysaccharides by colonic bacteria which also resulted in a considerably higher faecal bacterial mass in the aleurone group.

3. Because of the differences in the volume of caecal digesta, the mass of caecal VFA was considerably the highest in the aleurone group, intermediate with wheat bran and equally low in the pericarp-seed coat and cellulose groups.

4. The diet based on aleurone gave a relatively higher proportion of propionate but with both pericarp-seed coat and wheat bran the contribution of butyrate was raised.

5. VFA concentrations in hepatic portal venous plasma were proportional to caecal concentrations with very high (> 3 mM) values being recorded in the aleurone group.

6. The findings are discussed in relation to the apparent susceptibility of the morphological components of wheat bran to fermentation by large bowel bacteria.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 57 , Issue 1 , January 1987 , pp. 69 - 76
Copyright
Copyright © The Nutrition Society 1987

References

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