Acetylcholinesterase inhibitory activity of didehydrostemofoline, stemofoline alkaloids and extracts from Stemona collinsiae Craib roots

The AChE inhibitory activity of hexane, dichloromethane and methanol extracts from S. collinsiae roots and their major alkaloids, didehydrostemofoline and stemofoline, were determined. The data support the traditional utilization of this plant as a natural insecticide.