作者：Anastasia Wheni Indrianingsih a,∗, Sanro Tachibana b
关键词：Endophytic fungi; Quercus qilva Blume; -Glucosidase inhibitory activity; Xylariaceae sp.; Isocoumar
Xylariaceae sp. QGS 01, an endophytic fungus isolated from the stem of Quercus gilva Blume showed high -glucosidase inhibitory activity. -Glucosidase inhibitor have the role as one of carbohydrate-hydrolyzing enzymes to postpone absorption of glucose in the digestive organs. The -glucosidase inhibitor constituents were isolated from the ethyl acetate extract of the mycellium of endophytic fungi Xylariaceae sp. QGS 01 using a bioassay-guided fractionation technique. Further separation and purification of the active fraction led to the isolation of constituents with strong inhibitory activities against -glucosidase: 8-hydroxy-6,7-dimethoxy-3-methylisocoumarine (1) with inhibitory concentration (IC50) values against -glucosidase from Saccharomyces cerevisiae of 41.75g/mL, while quercetin as the standard had an IC50 value of 4.80g/mL. The results of the present study showed that the endophytic fungus Xylariaceae sp. QGS 01 is potentially a rich source of antidiabetic medicine.