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Dietary Fiber Viscosity and Endogenous Protein Excretion at the Terminal Ileum of Growing Rats¹

Department of Chemistry and Biochemistry ^* Department of Animal Science, Massey University, Palmerston North, New Zealand

The effect of dietary fiber viscosity on the excretion of endogenous nitrogen and amino acids from the small intestinal lumen of growing rats was investigated. Rats were fed for 12 d protein-free diets containing 5% cellulose (negligible viscosity) or 5% carboxymethylcellulose of low (20 cP), medium (800 cP) or high (2000 cP) viscosity, as the sole dietary fiber source. As dietary fiber viscosity increased from 0 to 2000 cP, there was a significant (P < 0.05) linear increase in the flow of endogenous nitrogen, aspartic acid, serine, glutamic acid, proline, threonine, glycine, alanine, isoleucine, histidine, valine, methionine, leucine and lysine at the terminal ileum. The amino acid composition of the ileal digesta was unaffected by changes in fiber viscosity. It seems that either endogenous protein of a similar origin was secreted in larger amounts or that the digestion and absorption of endogenous amino acids was inhibited as dietary fiber viscosity increased. There was a significant (P < 0.05) linear increase in the concentration of sialic acids relative to chromic oxide in the small intestinal contents with increasing fiber viscosity, indicating an increase in mucoproteins.

KEY WORDS: • dietary fiber • endogenous protein • viscosity • rats • carboxymethylcellulose

¹ The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 USC section 1734 solely to indicate this fact.

² To whom correspondence should be addressed.

Manuscript received 16 December 1992. Revision accepted 22 June 1993.

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