According to Meyer et al (1982), an extract was considered active if it is able to kill 50% larva Artemia at the concentration < 1000 g/ml. In this study all extracts of MD-01 and MD-02 displayed toxicity in the brine shrimp bioassay and MD-02CHCl3 was found to be the most toxic with LC50 of 48.15 g/ml (table 2).