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α-Glucosidase inhibitory caged xanthones from the resin of Garcinia hanburyi

  • Jin, Young Min (Division of Applied Life Science (BK21 plus), IALS, Gyeongsang National University) ;
  • Kim, Jeong Yoon (Division of Applied Life Science (BK21 plus), IALS, Gyeongsang National University) ;
  • Lee, Soo Min (Division of Applied Life Science (BK21 plus), IALS, Gyeongsang National University) ;
  • Tan, Xue Fei (Division of Applied Life Science (BK21 plus), IALS, Gyeongsang National University) ;
  • Park, Ki Hun (Division of Applied Life Science (BK21 plus), IALS, Gyeongsang National University)
  • Received : 2019.01.16
  • Accepted : 2019.01.22
  • Published : 2019.03.31

Abstract

A yellow resin (gamboge) from Garcinia hanburyi has been widely used as folk medicine due to its antibacterial and antitumor activities. We isolated four ${\alpha}$-glucosidase inhibitory compounds from the methanol extract of gamboge. The compounds (1-4) were identified as gambogoic acid (1), moreollic acid (2), gambogic acid (3), and 10-methoxygambogenic acid (4), respectively through spectroscopic data including 2D-NMR and HREIMS. All compounds were examined in the enzyme inhibition assay against ${\alpha}$-glucosidase to identify their inhibitory potencies and kinetic behavior. All compounds (1-4) showed enzyme inhibition against ${\alpha}$-glucosidase, but the activity was significantly affected by the methoxy group on C-10 of ring A and pentenyl pyran moiety of ring D. For example, compound 1 ($IC_{50}=41.4{\mu}M$) bearing pyran ring eight times effective that 4 ($IC_{50}=350.6{\mu}M$) having geranyl group itself. Most active compound was found out to be gambogoic acid (1) which was analyzed most abundant metabolite in gamboge by LC-ESI-MS/MS. In kinetic study, compounds 1 and 2 were proved as noncompetitive inhibitors.

Keywords

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