Antioxidant and Anticancer Activities of Extracts and Compounds Isolated from Terminalia nigrovenulosa Plant Grown in Vietnam

This study was to isolate and identify antioxidant and anticancer compounds from extracts of bark and leaf of Terminalia nigrovenulosa. The EtOAc fraction of bark and n-BuOH fraction of leaf exhibited the highest DPPH (2,2-diphenyl-2-picrylhydrazyl hydrate) radical scavenging activity. Nuclear magnetic resonance (NMR) and mass spectra results showed that gallic acid, ethyl gallate, ellagic acid, catechin and luteolin isolated in EtOAc and n-BuOH fractions were the main components possessed DPPH radical scavenging activity. These fractions and their isolated compounds reduced human fibrosarcoma (HT1080) cell viability in a dose-dependent manner. In addition, these fractions and their isolated compounds significantly increased caspase-3 activity. Therefore, the reduction of cell viability might be due to the induction of apoptosis via caspase-3 pathway. These findings could be useful for the development of new chemotherapeutic agents for the treatment of malignant cancers from T. nigrovenulosa extracts and isolated compounds.