Antioxidant Properties of the By-product Indonesian Favourable Fruits

Fruit seed waste is part of the fruit that cannot be eaten, abundant and its use is still limited so that it is often considered garbage by the community. One effort to reduce waste is by utilising metabolism as secondary as fruit seed waste. This research determined the phytochemistry, total phenolic, total flavonoid and antioxidant of Dimocarpus longan lour var diamond river, Mangifera indica var podang, Cucumis melo L var retikulus, and Parcia americana var miki mentega seeds. It had been extracted using 3 various solvents (n-hexane, methanolic, and ethyl acetate). The flavonoid was found in all fruit seeds methanol extract. Saponin and tanin were found in all fruit seeds methanol extract and M. indica var podang and P. americana var miki mentega ethyl acetate extract. The alkaloid was found in all fruit seeds in ethyl acetate and n-hexane extract. The Folin-Ciocalteu assay was employed to evaluate the overall phenol content, with a range that took away 22.6-142.17 mg/g GAE. The highest total phenolic was found in M. indica var podang seed with methanolic extract. Total flavonoid compounds were determined by aluminium chloride calorimetric, with range 20.32-40.27 mg/g Quercetin Equivalent. The highest total flavonoid was found in M. indica var podang seed with methanolic extract. The potential antioxidant activities were assessed using the DPPH (diphenyl picryl hydrazyl) radical scavenging capacity, which showed a range of 15.23 to 87.23 percent activity of scavenging, the highest percentage of DPPH radical scavenging was acquired in M. indica var podang seed with methanolic extract, with the best IC50 65.75 µg/mL.