Abstract:

Objective: The antioxidant activities of extracts from different parts of Viola japonica Langsd., Phytolacca acinosa Roxb, Plantagoasiatica L., Premna microphylla Turcz. and Epimedium sagittatum were determined to screen natural antioxidant resources and effective parts. Methods: Different parts of these plants were extracted with methanol under the assistance of ultrasound wave treatment. The antioxidant activities of these plants were assayed by evaluating the scavenging effects on DPPH free radicals. Results: All the extracts from these plants had significant antioxidant activity. The strongest DPPH free radical scavenger was the extract from leaves of Premna microphylla Turcz., followed by extracts from leaves of Viola japonica Langsd., leaves of Plantagoasiatica L., roots of Plantagoasiatica L., leaves of Epimedium sagittatum, leaves of Phytolacca acinosa Roxb, roots of Phytolacca acinosa Roxb, and roots of Viola japonica Langsd.. Conclusion: There is a close relationship between antioxidant activity and the type and part of these plants and the extracts from different parts of these plants shows an antioxidant effect positively dependent on dose.

Key words: Viola japonica Langsd., Phytolacca acinosa Roxb, Premna microphylla Turcz., Plantagoasiatica L., Epimedium sagittatum, antioxidation