Physical Properties and Effects on Lipid Metabolism of Soybean Fiber in Rats.

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  • NAGATA Junichi
    Department of Bioscience and Biotechnology, Faculty of Agriculture, University of the Ryukyus
  • OKU Hirosuke
    Department of Bioscience and Biotechnology, Faculty of Agriculture, University of the Ryukyus
  • TODA Takayoshi
    Department of Clinical Laboratory Medicine, School of Medicine, University of the Ryukyus
  • CHINEN Isao
    Department of Bioscience and Biotechnology, Faculty of Agriculture, University of the Ryukyus
  • OHZEKI Masanao
    Nisshin Oil Mills Co.

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  • 大豆由来高食物繊維素材の物理的特性とラット脂質代謝へ及ぼす影響
  • ダイズ ユライ コウ ショクモツ センイ ソザイ ノ ブツリテキ トクセイ ト

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Abstract

The effects of soybean fiber (SBF) on lipid metabolism, growth and gastrointestinal transit time were investigated in rats. The types of dietary fiber used soybean fiber treated with ethanol and enzyme (SBF), commercially available soybean dietary fiber (CAD), and cellulose as a control. Electron microscopy examination of the fibers showed a matrix structure in SBF and a rather smooth surface in CAD. SBF had a higher water-holding capacity and settling volume than CAD (p<0.01). Animals were fed semipurified diets containing 6% of these dietary fibers in combination with 1% cholesterol. The serum cholesterol concentration at the end of the first week was significantly lower in the SBF group than in the CAD (p<0.05) and cellulose (p<0.01) groups. No significant difference was seen in liver cholesterol and phospholipid levels, fecal steroid excretion and gastrointestinal transit time between the groups. These results suggest that the hypocholesterolemic effect of SBF is ascribable to its porous structure, which is responsible for a higher water-holding capacity and settling volume, rather than increased fecal sterol excretion.

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