Plant material and preparation of extract
D. scandens stem was collected in Songkla province in southern
Thailand and identified by Dr. Arunporn Itharat. A voucher speci-
men (SKP A 1410101) is deposited in the Department of Pharma-
ceutical Botany and Pharmacognosy, Faculty of Pharmaceutical
Science, Prince of Songkla University, Hat Yai, Thailand.
The materials were dried in the shade and the dried material
(100 g) was macerated in boiling water for 30 min, centrifuged
at 800 g for 10 min and the supernatant was freeze-dried. The
process was repeated twice to yield 8.96 g of freeze-dried extract.