Momordica charantia Constituents and Antidiabetic Screening of the Isolated Major Compounds

  • Harinantenaina Liva
    Faculty of Pharmaceutical Sciences, Tokushima Bunri University
  • Tanaka Michi
    Faculty of Pharmaceutical Sciences, Tokushima Bunri University
  • Takaoka Shigeru
    Faculty of Pharmaceutical Sciences, Tokushima Bunri University
  • Oda Munehiro
    Food Functionality Research Institute, Division of Research and Development, Meiji Dairies Corporation
  • Mogami Orie
    Food Functionality Research Institute, Division of Research and Development, Meiji Dairies Corporation
  • Uchida Masayuki
    Food Functionality Research Institute, Division of Research and Development, Meiji Dairies Corporation
  • Asakawa Yoshinori
    Faculty of Pharmaceutical Sciences, Tokushima Bunri University

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抄録

Bioguided fractionation of the methanol extract of Momordica charantia dried gourds led to the isolation of three new cucurbitane triterpenoids (1—3), together with eight known compounds (4—11). The aglycone of momordicoside I was isolated from the ether soluble fraction in a high amount. The structures of the metabolites were established on the basis of one and two dimensional NMR spectroscopic evidence, X-ray analysis, and comparison with the reported data in the literature. A number of phytochemicals have been isolated from Momordica charantia but the constituents responsible for the hypoglycaemic/antihyperglycaemic activities have not been determined. Therefore, in order to evaluate the contribution of the cucurbitane triterpenoids of the ether fraction of M. charantia methanol extract to in vivo anti-diabetic effects, the major compounds, 5β,19-epoxy-3β,25-dihydroxycucurbita-6,23(E)-diene (4), and 3β,7β,25-trihydroxycucurbita-5,23(E)-dien-19-al (5) have been tested and have shown blood hypoglycaemic effects in the diabetes-induced male ddY mice strain at 400 mg/kg. The two aglycones of charantin did not show any hypoglycaemic effects. Our finding is the first demonstration that major pure cucurbutanoid compounds of M. charantia have in vivo hypoglycaemic effects.

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