DPPH is usually used as a substrate to evaluate antioxidant activity. In this method a methanolic solution of DPPH is reduced in the presence of hydrogen-donating antioxidants to form a yellow colored non radical form of DPPH. In the DPPH assay, the alcoholic and aqueous extracts of T. asiatica roots exhibited high scavenging activity, IC50 97 and 104 μg/ml, respectively. Ascorbic acid, used as a standard, had an IC50 value of 68 μg/ml.