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The genus Sterculia rich of metabolite secondary flavonoids and phenolic compounds. The phenolic compounds such as phenolic acid, propanoic phenyl, coumarins, lignans, and lignin with much smaller amounts than flavonoids.1 The ironreducing antioxidant power (FRAP) test was a method used to determine antioxidant activity by reducing Fe (III) to Fe (II) by complexation with 2,4,6-Tripyridyl-s-Triazine (TPTZ). The test is carried out at acidic pH 3,6 to maintain iron solubility.2 FRAP value obtained with comparing changes in the absorption of the test mixture at 593 nm with the mixture, which contains Ferro ions whose concentration is known.3-5 The FRAP test based on electron transfer. FRAP cannot detect compounds that work by radical reduction (hydrogen transfer). Method FRAP testing is simple, fast, inexpensive, and requires no special equipment.2 In this study, the antioxidant activity of S. Stipulata determined. Antioxidants play an important role in the prevention and treatment of metabolic disorders caused by oxidative stress.6 Some sterculia genus plants are known to have antioxidant activity, including methanol extract Sterculia foetida stems with IC50 values of 20 μg/ ml.7 Sterculia villosa bark ethyl acetate fraction with IC50 23.99 μg/ml. 8

The Antioxidant Activity of Sterculia stipulata Korth Woods and Leaves by FRAP Method