2. Experimental
2.1. Plants
Plants, collected from various locations in Thailand, were authenticated in the Herbariums in the Bangkok
Herbarium, Botanical Section Botany and Weed Science Division, Department of Agriculture, Bangkok, Thailand. The
specimens were deposited in the Faculty of Pharmacy, Mahidol University, Bangkok, Thailand.
2.2. Preparation of extracts
Parts of the 19 plants were used in this study according to their usages in traditional medicines. Plant materials dried,
moderately powdered and macerated in EtOH were filtered. The filtrate evaporated in vacuum rotary evaporator gave
the extracts reported in Table 1.