Effect of Resistant Maltodextrin on Digestion and Absorption of Lipids

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  • Kishimoto Yuka
    Research Laboratory, Matsutani Chemical Industry Co., Ltd. Department of Nutrition, Graduate School of Nutrition, Koshien University
  • Yoshikawa Yuko
    Research Laboratory, Matsutani Chemical Industry Co., Ltd.
  • Miyazato Shoko
    Research Laboratory, Matsutani Chemical Industry Co., Ltd.
  • Oga Hiroshi
    Research Laboratory, Matsutani Chemical Industry Co., Ltd.
  • Yamada Takako
    Research Laboratory, Matsutani Chemical Industry Co., Ltd.
  • Tagami Hiroyuki
    Research Laboratory, Matsutani Chemical Industry Co., Ltd.
  • Hashizume Chieko
    Research Laboratory, Matsutani Chemical Industry Co., Ltd.
  • Yamamoto Kunio
    Department of Nutrition, Graduate School of Nutrition, Koshien University

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In order to confirm the mechanism how postprandial elevation of triacylglycerol is suppressed by resistant maltodextrin (Fibersol-2), we conducted the following experiments. Firstly, Rats were fed a high-fat diet with resistant maltodextrin at 0% (control), 2.5% or 5% for 5 weeks to determine the lipid amount excreted in the feces of the last three days. The total lipid and triacylglycerol excreted in rat feces were significantly increased in a dose-dependent manner by the ingestion of resistant maltodextrin. Secondly, 10 healthy adult subjects were administrated a beverage containing 5 g resistant maltodextrin or placebo for 10 days, and crossed over after an 11-day washout. Total lipid excreted in feces was determined by collecting all the feces for the last three days. Fecal weight and fecal lipid amount of the subjects increased significantly with the ingestion of resistant maltodextrin compared to the placebo ingestion. Thirdly, oil emulsion prepared with resistant maltodextrin was assessed for its hydrolysis rate by lipase. The hydrolysis rate of lipid by lipase was not affected by resistant maltodextrin. Lastly, micelle emulsion was prepared with or without resistant maltodextrin, and their stability was compared. Resistant maltodextrin inhibited the decomposition of micelles and stabilized micellar structure. From these results, it was suggested that resistant maltodextrin suppresses lipid absorption and promotes the excretion of lipid into feces by delaying the release of fatty acids from micelles in the lipid absorption process. No inhibitory effect on lipase activity was observed by resistant maltodextrin.

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