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Water‐holding capacity of insoluble fibre decreases free water and elevates digesta viscosity in the rat
Author(s) -
Takahashi Toru,
Furuichi Yukio,
Mizuno Takafumi,
Kato Masako,
Tabara Aya,
Kawada Yuka,
Hirano Yoshiyuki,
Kubo Kinya,
Onozuka Minoru,
Kurita Osamu
Publication year - 2008
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.3433
Subject(s) - water holding capacity , swelling capacity , water retention , chemistry , swelling , viscosity , food science , dietary fibre , free water , apparent viscosity , cation exchange capacity , materials science , biology , composite material , soil water , ecology , environmental engineering , engineering
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 digesta was control group < shiitake fibre group < tossa jute fibre group in gastric, small intestinal and caecal contents ( P < 0.05). The digesta viscosity at a shear rate of 40 s −1 was strongly correlated with the free water content of digesta ( 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 < 0.001). CONCLUSION: The viscosity of digesta depends on the free water content, and this is reduced by fibre that holds water and can swell. Copyright © 2008 Society of Chemical Industry