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  • Title: Anti-diabetic activity present in the fruit body of Grifola frondosa (Maitake). I.
    Author: Kubo K, Aoki H, Nanba H.
    Journal: Biol Pharm Bull; 1994 Aug; 17(8):1106-10. PubMed ID: 7820117.
    Abstract:
    The fruit body of Grifola frondosa (maitake), Basidiomycetes was confirmed to contain substances with anti-diabetic activity. When 1 g/d of powdered fruit body of maitake was given orally to a genetically diabetic mouse (KK-Ay), blood glucose reduction was observed, in contrast to the control group in which the blood glucose increased with ageing. Moreover, levels of insulin and triglyceride in plasma demonstrated a change similar to blood glucose with feeding of maitake. Ether-ethanol-soluble (ES) and hot water-soluble (WS) fractions were prepared from the fruit body and their hypoglycemic activity was examined. Blood glucose-lowering activity was found when ES-fraction or WS-50% ethanol float (X) fraction was administered orally, but other WS-fractions were inactive. These results suggest that the anti-diabetic activity was present not only in the ES-fraction consisting of lipid but also in the X-fraction of peptidoglycan (sugar:protein = 65:35).
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