Effects of Dietary Fiber Prepared from Sweet Potato Pulp on Cecal Fermentation Products and Microflora in Rats

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  • Takamine Kazunori
    Food Industry Division, Kagoshima Prefectural Institute of Industrial Technology Department of Applied Chemistry and Biochemistry, Faculty of Engineering, Kumamoto University
  • Hotta Hisako
    Faculty of Home Economics, Kobe Women's University
  • Degawa Yoko
    Sanwa Cornstarch Co., Ltd.
  • Morimura Shigeru
    Department of Applied Chemistry and Biochemistry, Faculty of Engineering, Kumamoto University
  • Kida Kenji
    Department of Applied Chemistry and Biochemistry, Faculty of Engineering, Kumamoto University

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  • サツマイモ澱粉粕から調製した食物繊維がラットの盲腸発酵産物および腸内細菌叢に及ぼす影響

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Abstract

Sweet potato dietary fiber (SPDF) was prepared from sweet potato pulp on an industrial scale. Its dietary fiber content was 83.8%. Male Wistar Hannover GALAS rats, 4 wk old, were fed diets containing cellulose or SPDF for 27 d. The cellulose and SPDF level was adjusted to 10%. The effects of SPDF on the cecal fermentation products and microflora in rats were investigated. The body weight gain of the rats fed SPDF-containing diet (SPDF rats) was lower than that of the rats fed the cellulose-containing diet (control rats) because of a significant decrease in food intake. There was no significant difference in the pH value of the cecum content. In the SPDF rats, the cecum weights of content and tissue were heavier, the weight of wet feces was lower, and the moisture content of feces was significantly higher than in the control rats. The numbers of intestinal bacteria of the SPDF rats were higher than those of the control rats, and Bifidobacterium sp. was found only in the SPDF rats. The ratio of the total anaerobes to the total aerobes in the SPDF rats was higher than that in the control rats. The propionate concentration significantly increased in the cecum content of the SPDF rats.

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