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Isolation of Intestinal Glucose Uptake Inhibitor from Punica granatum L.

  • Kim, Hye-Kyung (Department of Food and Biotechnology, Hanseo University) ;
  • Baek, Soon-Sun (R&D Headquarters Ginseng Research Institute, Korea Ginseng Corporation) ;
  • Cho, Hong-Yon (Department of Food and Biotechnology, College of Science and Technology, Korea University)
  • Received : 2011.03.31
  • Accepted : 2011.06.03
  • Published : 2011.06.30

Abstract

Inhibition of intestinal glucose uptake is beneficial in reducing the blood glucose level for diabetes. To search for an effective intestinal glucose uptake inhibitor from natural sources, 70 native edible plants, fruits and vegetables were screened using Caco-2 cells and fluorescent D-glucose analog 2-[N-(7-nitrobenz-2-oxa-1,3-diazol-4-yl) amino]-2-deoxy-D-glucose (2-NBDG). A compound that was able to inhibit glucose uptake was isolated from methanol extract of Punica granatum L. and called PG-1a. PG-1a appears to be a phthalic acid-diisononyl ester- like compound (PDE) with molecular weight of 418. The inhibitory effect of PG-1a on intestinal glucose uptake was dose-dependent with 89% inhibition at $100\;{\mu}g$/mL. Furthermore, the intestinal glucose uptake inhibitory effect of PG-1a was 1.2-fold higher than phlorizin, a well known glucose uptake inhibitor. This study suggests that PG-1a could play a role in controlling the dietary glucose absorption, and that PG-1a can effectively improve the diabetic condition, and may be used as an optional therapeutic and preventive agent.

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