Abstract
ABSTRACT Knoxia sumatrensis leaf extracts in methanol were analyzed for the phytochemical compositions, antioxidant properties (DPPH, ABTS, and hydroxyl radical assay), anti-proliferative activity (lung cancer A549 and breast cancer MCF-7 cell lines), and mosquito larvicidal properties. The GC-MS analysis showed the presence of eight bioactive compounds of which the hexadecanoic Acid, 2-Propyl-, methyl Ester, and 2,3-anhydro-D-Mannosan were the two major compounds present. The bioactive compounds present included phenolics and flavonoids (55.0 ± 1.3 mg GAE g−1 d.w. and 42.5 ± 0.5 mg RE g−1 d.w.). FT-IR analysis detected the presence of aldehydes and anhydrites functional groups. Antioxidant properties were positively associated with the secondary metabolites. The anti-proliferative activity of methanolic leaf extracts showed the IC50 values 135.82 and 181.73 μg mL−1 for A549 and MCF-7, respectively. The methanolic extract also showed larvicidal activity on three mosquito species with highest toxicity on Culex quinquefasciatus larvae with LC50 4.84 mg mL−1 and LC90 19.33 mg mL−1.
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