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Grape skin is a waste produced from wine making derived from grapes. Currently the use of grape skins is still limited as a natural fertilizer. This research is study to determine the total levels of phenols, flavonoids both as antioxidants and IC50 in the grape skins from the waste of wine making. The study was determination quantitative of total phenolics with the folin-ciocalteu method expressed as mg of gallic acid equivalent (GAE), total flavonoids content by AlCl3 method expressed as Quercetin equivalen (QE) and antioxidant activity can be determined by using the DPPH test. The results stated that the total phenol, flavonoid and IC50 levels of grape skins were 168.55 (mg / 100gr) ; 61.10 (mg / 100 gr) and 1,065.19 ppm. The presence of total phenols, flavonoids and IC50 in grape skins is relatively high, so the use of grape skins from the process of making wine makes attention.

proceedings of the proceedings of the 7th mathematics, science, and computer science education international seminar, msceis 2019, 12 october 2019, bandung, west java, indonesia

Total Phenol, Flavonoid Levels and IC50 in Local Grape (Vitis vinifera L) Skin Waste Wine