Abstract
Ethnobotanically in Indonesia, Diospyros celebica Bakh is recognized as having antidiabetic activity. This study aimed to isolate antidiabetic compounds from the leaves of Eboni (Diospyros celebica). D. celebica leaves were dried and extracted with 96% ethanol, then fractionated and purified guided by antioxidant activity test, α-glucosidase inhibitory test, and dipeptidyl peptidase-4 (DPP-4) inhibitory test until bioactive isolates were obtained. The isolates were identified and their structures were determined based on NMR 1H, 13C, 2D, and LCMS/MS spectroscopic data. Extracts and fractions have potential antioxidant (DPPH), glucosidase inhibitor, and DPP-4 inhibitor activities as well as containing flavonoids and polyphenols. From the ethyl acetate fraction, isolate 26a-2 namely 3,5-digalloyl-(-)- epiafzelechin was obtained which was active as a DPPH scavenger, glucosidase inhibitor, and DPP4 inhibitor. The extracts, fractions, and flavonoid compounds in D. celebica leaves have the potential for antidiabetic drug candidates.
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