Characteristics of antioxidant activity of functional drinks from kebo rubber leaf extract and lemongrass extract

The rubber plant ( Ficus Elastica L. ) is an ornamental plant that is rarely used for consumption. This research aims to determine the characteristics of the antioxidant activity of functional drinks from rubber leaf extract and lemongrass extract. The research method used the Randomized Complete Block with two factors i.e., the ratio of rubber leaf extract and lemongrass extract (70%:30% w/w; 50%:50% w/w; 30%:70% w/w), and the ratio of stevia solution and sugar solution (0:100%; 50%:50%; 100%:0), that had 2 repetitions and resulted in 18 samples of experimental. Then the results were tested its antioxidant activities using the DPPH method and tannin analysis. The best result for antioxidant activity was obtained by the H1T3 sample with an IC50 value is 12.41 ppm, flavonoid content is 10.99% and tannin content is 2.86%. From the parameter results, the functional drinks of rubber leaf extract and lemongrass extract have the potential to contain a very strong antioxidant activity.