Efficient free radical scavenging activity of Ginkgo biloba, Stevia rebaudiana and Parthenium hysterophorous leaves through DPPH (2, 2-diphenyl-1-picrylhydrazyl)

Free radical scavenging activity of three important plants Ginkgo biloba, Stevia rebaudiana and Parthenium hysterophorous was carried out to evaluate and explore new potential sources of natural antioxidants. For this purpose the leaves of the three plants were processed. In these experiments the order of the antioxidant activity was, maximum activity shown by methanolic extract of Ginkgo biloba followed by Parthenium hysterophorous and Stevia rebaudiana. Furthermore the ethanolic extract of Ginkgo biloba also showed maximum antioxidant activity seconded by Stevia rebaudiana and Parthenium hysterophorous. Keywords: Ginkgo biloba, Stevia rebaudiana and Parthenium hysterophorous, DPPH, radical scavenging activity