Antioxidant Activity of 15 Manokwari Medicinal Plants using DPPH Assay
The antioxidant activities of 15 medicinal plants from Manokwari, West Papua, were evaluated using the DPPH assay. The organic content of it was extracted in water and in 80% methanol/ 20% water. Total phenolic contents were determined for both water and methanol extracts. The correlation coefficient (R2) was found in both water (R2 = 0.751) and methanol (R2 = 0.842) extracts. The comparison of the two extracts show that the methanol extract have similar antioxidant activity but higher total phenolic content compared to the water extract. It was found that stem of P. pinata (88.71%), stem of C. cullilawang (80.69%) and stem of A. flava (73.28%) are the medicinal plants with the highest antioxidant activities in the methanol extract and stem of P. pinata (76.92%) followed by the stem of C. cullilawang (65.88%) and the leaf of B. ptersianum Klocth (63.76%) in the water extract, respectively.