Journal
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
Volume 89, Issue 2, Pages 245-250Publisher
WILEY
DOI: 10.1002/jsfa.3433
Keywords
insoluble fibres; viscosity; water-holding capacity; free water; digesta; rat
Funding
- Scientific Research [19.580154]
- Yazuya Research
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BACKGROUND: The relationships between possible physiological properties of insoluble fibre and the viscosity of digesta are poorly understood. The aim of this study was to investigate the effect of insoluble fibres with different water-holding capacity, swelling, oil-holding capacity and cation exchange capacity on gastric, small intestinal and caecal contents in rats fed a semi-purified diet containing either no fibre (control), 50 g kg(-1) tossa jute fibre or 50 g kg(-1) shiitake fibre. RESULTS: The water-holding capacity, swelling, oil-holding capacity and cation exchange capacity of insoluble fibres of tossa jute were higher than those of shiitake (P < 0.001). The order of the viscosities of cligesta was control group < shiitake fibre group < tossa jute fibre group in gastric, small intestinal and caecal contents (P < 0.05). The cligesta viscosity at a shear rate of 40 s(-1) was strongly correlated with the free water content of cligesta (r = -0.89; P < 0.01). The free water content of digesta depended on the water-holding capacity of insoluble fibres represented as a linear function with negative slope (P < 0.0011). CONCLUSION: The viscosity of digesta depends on the free water content, and this is reduced by fibre that holds water and can swell. (C) 2008 Society of Chemical Industry
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