Comparison of in vitro antioxidant properties of extracts from three plants used for medical purpose in Cameroon: Acalypha racemosa, Garcinia lucida and Hymenocardia lyrata

Objective: To investigate the in vitro antiradical and antioxidant properties of methanol extracts of Garcinia lucida, Hymenocardia lyrata (H. lyrata) and Acalypha racemosa. Methods: We determined the in vitro antioxidant activity and the total phenolic content, and performed the phytochemical screening of the extracts from fruits, barks, leaves, roots and stems of these plants using standard procedures. Results: The results of the antioxidant properties showed that more than 60% of DPPH., NO. and HO. radicals were inhibited by the extracts. The radical scavenging activity, the total antioxidant capacity as well as the reducing power increased with the concentration of the extracts. The 50% inhibitory concentration (IC50) varied from 1.46 to 21.65 μg/mL depending of the type of extract and the antioxidant tests. The results indicated that all the extracts exhibited antioxidant properties and the roots of H. lyrata showed the best antioxidant activity [(217.17±9.45) mg Equivalent catechin/g of extract] while the highest total phenol content was found in its barks [(169.782±3.025) mg Eq cat/g of extract]. Conclusions: The methanol extract of H. lyrata possess the most antioxidant property among the three extracts