“…Studies on bark, stem and bough of samples from other origins showed low or no activity (Frederich et al, 1999;Philippe et al, 2005;Zirihi et al, 2005) but it is the first time that the in vitro activity of the leaves of Strychnos spinosa is demonstrated. Many antiplasmodial alkaloids were found in various Strychnos species (Frederich et al, 2002) but phytochemical investigations showed that alkaloids were not present in detectable quantities in our extracts.…”