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Crassocephalum crepidioides  or locally known as “tanduk manggarang” (Bajau) or “gipun” (Dusun) is an underutilized weed that has been consumed as wild edible vegetable by Sama Bajau people in Kota Belud, Sabah. The villagers obtained the plant from local traders at fresh market or foraging the plant from forest. Correlation between TPC and TFC with IC 50  of DPPH and ABTS scavenging activities were analysed by using Pearson’s correlation. The ethanolic extract exhibited the highest TPC (175.06±0.574 µg/ml) and TFC (139.72±0.923 µg/ml), followed by hot water extract with TPC of 54.45±0.818 µg/ml and TFC of 25.07±0.156 µg/ml. The distilled water extract showed the lowest TPC (29.98±0.918 µg/ml) and TFC (19.96±0.538 µg/ml). Antioxidant activities also demonstrated the same trend, ethanolic extract displayed the highest percentage of antioxidant activity of DPPH (85.4±1.64 %) and ABTS (85.2±0.57 %), followed by hot water extract with 65.4±3.87 % for DPPH and 79.4±3.2 % for ABTS. Distilled water extract had the lowest antioxidant activities for both DPPH (55.0±0.7 2%) and ABTS (71.35±2.61 %). The IC 50  of DPPH assay were decreasing in the subsequent order; distilled water&gt;hot water&gt;ethanolic. Meanwhile, the IC 50  of ABTS were decreasing in the following order; hot water&gt;distilled water&gt;ethanolic. There was negative high correlation between TPC in  C. crepidioides  leaves extracts with their IC 50  of DPPH and ABTS assays. Following the same trend, there was also negative high correlation between TFC in  C. crepidoides  leaves extracts with their IC 50  of DPPH and ABTS assays. As a conclusion, this readily available wild edible vegetable could be a potent resource of natural antioxidant for rural populace in Sabah, Malaysian Borneo.

iop conference series. earth and environmental science

Ethnobotanical note, total phenolic content, total flavonoid content, and antioxidative activities of wild edible vegetable, Crassocephalum crepidioides from Kota Belud, Sabah