Bioassay-guided Isolation and Identification of a Acetylcholinesterase Inhibitors from Calophyllum polyanthum

摘要

A significant acetylcholinesterase inhibitory activity was observed for the Ethanolic extract from the leaves of Calophyllum polyanthum by using TLC bioautographic method. Further bioassay-guided isolation of this extract using TLC bioautographic method resulted in obtaining a pyranochromanone, apetalic acid (1). The structure of 1 was identified by comparison of it's spectral characteristics with previous reports. The concentration required for 50% inhibition of 1 was 0.95 mM, determined by a microplate assay. The anti-acetylcholinesterase aity of compound 1 was weak, but it was the first pyranochromanone which have anti-acetyl cholinesterase activity. As a new leading compound, it can be modified and transformed to obtain more potently active compounds.