小腸におけるオリゴ糖の膜消化

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書誌事項

タイトル別名
  • Membrane Digestion of Oligosaccharides
  • ショウチョウ ニ オケル オリゴトウ ノ マク ショウカ

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抄録

As an introduction, luminal, contact, and membrane digestion of starch and maltooligosaccharides were briefly summarized. Hardly digestive starch granules, for example those of potato, banana, and high-amylose maize having amylose-extender gene were digested in vivo better than in vitro. Approximately 50% of potato starch granules ingested by rats fed on a PSG diet containing the starch granules as the main carbohydrate disappeared in rat bodies with making corrections for starches in feces and in contents of the gastrointestinal tracts. α-Amylase activity in pancreas and small-intestinal tract of rats fed on the PSG diet was either lower than or similar to that of rats fed on a PPS diet which consists of pregelatinized potato starch instead of potato starch granules in the PSG diet. Activities of maltase and isomaltase of small-intestinal mucosa of rats fed on the PSG diet were similar to those of rats fed on the PPS diet. However, activities of sucrase, lactase, and "glucoamylase" of the mucosa of rats fed on the PSG diet were higher than those of rats fed on the PPS diet. Disaccharidases of the mucosa were fractionated by Sephacryl gel filtration. Sucraseisomaltase complex and maltase fraction having "glucoamylase" activity degraded considerably pancreatic a-amylase limit dextrin. This strongly suggests that the increased sucrase and "glucoamylase" activities by feeding the PSG diet play a role in degradation of products by luminal a-amylolysis.

収録刊行物

  • 澱粉科学

    澱粉科学 31 (2), 92-97, 1984

    日本応用糖質科学会

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