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 %.
