Antioxidant Activity of Melinjo Ketan (Gnetum gnemon L., ‘Ketan’) Seed Extract at Various Ripening Stages and Ethanol Solvent Concentration

Bambang Kunarto (1), Sutardi Sutardi (2), - Supriyanto (3), Chairil Anwar (4)
(1) Department of Agricultural Product Technology, Faculty of Agricultural Technology, Semarang University
(2) Department of Food Science, Faculty of Agricultural Technology, Gadjah Mada University
(3) Department of Food Science, Faculty of Agricultural Technology, Gadjah Mada University, Jl. Flora No. 1 Bulaksumur Yogyakarta 55281, Indonesia.
(4) Department of Chemistry. Faculty of Mathematics and Natural Science, Gadjah Mada University
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How to cite (IJASEIT) :
Kunarto, Bambang, et al. “Antioxidant Activity of Melinjo Ketan (Gnetum Gnemon L., ‘Ketan’) Seed Extract at Various Ripening Stages and Ethanol Solvent Concentration”. International Journal on Advanced Science, Engineering and Information Technology, vol. 9, no. 4, Aug. 2019, pp. 1344-51, doi:10.18517/ijaseit.9.4.9376.
Melinjo seeds (Gnetum gnemon L.) have the potency as antioxidants due to their bioactive compounds such as polyphenols, flavonoids, tannins, and resveratrol. The study was conducted to determine the effect of the ripening stages of Melinjo ketan variety seeds and ethanol solvent concentration on total of phenolic, flavonoid also resveratrol content, and antioxidant activity of Melinjo seed extract. The ripening stages of Melinjo seeds used were immature, semi-mature and mature. The ethanol solvent concentrations were 20%, 50% and 80%. Samples of dried melinjo seeds were macerated in ethanol (1: 5) at room temperature for 2 days. The extract was filtrated, evaporated and freeze-dried. This study reported that the ripening stages of melinjo seeds and ethanol solvent concentrations hadeffect on the total of phenolic, flavonoid, resveratrol content, and antioxidant activity of melinjo seed extractsignificantly (p<0,05). Mature melinjo seeds macerated using 50% ethanol solvent produced extract with the highest antioxidant activity. It had the total phenolic content of 7.033 ± 0.06 mg GAE/g, total flavonoids content of 335.04 ± 1.32 mg CE/100 g, resveratrol content of 1.55 ± 0.3%, DPPH radical inhibition of 66.07 ± 0.38%, and reducing power (80.26 ± 0.06%).These studies showed that the antioxidant effect of Melinjo ketan extract is influenced by the level of maturity and solvent concentrations of ethanol that can be an alternative of antioxidant sources. It is recommended to use Melinjo ketan seeds macerated with 50% ethanol solvent. 

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