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Abstract
Antioxidant activities of wood and leaf extracts of Hopea erosa were investigated using five in vitro assays. Dichloromethane (DCM) and methanolic extracts were found to exhibit higher antioxidant activity compared to chloroform extract. The activity of DCM extract of leaf was higher in H2O2 and hydroxyl scavenging assays with 95.04 % and 93 % respectively. DPPH, FRAP and ABTS assays were highly sensitive to methanolic extract of leaf with 87.24 %, 91.08 % and 89.81 % respectively. Likewise, the DCM extract of wood possess higher activity in FRAP (95.72 %) and ABTS (94.53 %) and the methanolic extract exhibited higher activity in H2O2 (90.75 %) and DPPH (83.36 %) assays. The hydroxyl scavenging assay is sensitive to chloroform extract of wood. These results show promising perspectives for the exploitation of critically endangered tree species of Hopea erosa having considerable levels of antioxidant capacity.
