Evaluation of some plant secondary metabolites activity to control algae

This study includes isolation , purification and identification of algae from different aquatic environments in Baghdad. Two different plant species belonging to different families were selected which were Citrilluscolocynthus and Cordiamyxa for their fruits and fruits samples respectively. Crude extracts were extracted from each plant and their antialgal activity were evaluated.Different concentrations (5,15,25) mg/ml of these extracts were prepared and their antagonistic activity was studied, and the resulted inhibition effects in ( %) of concentration of chlorophyll(a) after 12 days was evaluated. Results showed that Chloroccumhumicola was the most sensitive to these extracts. However, Anabaena circinalis was less sensitive than all other algae used in this study. Also showed that phenol was the most active against algae and terpene had less antagonistic activity comparing with all other extracts.