A total of 30 chloroform and methanol extracts from the following
endemic Soqotran plants Acridocarpus socotranus Olive, Boswellia
socotranao Balf.fil, Boswellia elongata Balf. fil., Caralluma
socotrana N. Br, Cephalocroton socotranus Balf.f, Croton socotranus
Balf. fil.., Dendrosicycos socotrana Balf.f., Dorstenia gigas
Schweinf. ex Balf. fil., Eureiandra balfourii Cogn. & Balf. fil.,
Kalanchoe farinaceae Balf.f, Limonium sokotranum (Vierh) Radcl.
Sm), Oldenlandia pulvinata , Pulicaria diversifolia ( Balf. and
Pulicaria stephanocarpa Balf. were screened for their
acetylcholinesterase inhibitory activity by using in vitro Ellman
method at 50 and 200 µg/ml concentrations. Chloroform extracts of
Croton socotranus, Boswellia socotrana, Dorstenia gigas, and Pulicaria
stephanocarpa as well as methanol extracts of Eureiandra balfourii
exhibited inhibitory activities higher than 50 % at concentration of
200 ·g. At a concentrations of 50 ·g, the chloroform extract
of Croton socotranus exhibited an inhibition of 40.6 %
