Kadar Vitamin C dan Aktivitas Antioksidan Kulit Buah Naga Segar (Hylocereus S)

Dragon fruit is originated from South America and began to be popular in Indonesia in 2010. Various studies on the pharmacological activity of dragon fruit have been widely done. The pharmacological activity of dragon fruit certainly can't be apart from its bioactive contents. Some studies show that bioactive compounds such as vitamin C are higher in the peel than in the flesh of the fruit, as well as the antioxidant activity in the peel is better than in the flesh. This study aims to determine the antioxidant activity and vitamin C content of fresh dragon fruit peel. The method used in determining the antioxidant activity is by using 1,1-diphenyl-2-picrylhydrazyl (DDPH) reagent, the absorbance of the reactan was then measured by the UV-Vis spectrophotometer to determined the IC50 value. Determining vitamin C contents was also done using a UV-Vis spectrophotometer. The results indicated that the antioxidant activity of fresh dragon fruit peel was 140.12 ± 5.76 mg / ml and vitamin C levels were 252 mg in 100 grams of dragon fruit peel. Differences in the content of bioactive compounds in fruits depend on a number of elements such as genotypes, environmental conditions, ripeness and the place of cultivation.