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[Objective] To investigate the antioxidant activities of different polarity fractions of Rhodiola rosea L.extracts in vitro.[Method] The extracts of Rhodiola rosea L.were divided into 3 different polarity fractions by ethyl acetate,normal butyl alcohol and water.The antioxidant activities of which were compared and assessed by reducing capacity,scavenging activities of superoxide anion radical(O2-·),hydroxyl radicals(·OH) and inferior nitric acid root(NO-2).[Result] Different polarity fractions of Rhodiola rosea L.extracts showed antioxidant activities,while the antioxidant activity of which varied in different reaction systems and the differences existed among different polarity fractions.Ethyl acetate fraction and normal butyl alcohol fraction had better reducing activity and scavenging activities on O2-· and ·OH than water fraction did.However,water fraction had better scavenging effects on NO-2 than ethyl acetate fraction and normal butyl alcohol fraction did.[Conclusion] Extracts from Rhodiola rosea L.had strong antioxidant activity,which could be a good source of natural antioxidants
[Objective] To investigate the antioxidant activities of different polarity fractions of Rhodiola rosea L. extracts in vitro. [Method] The extracts of Rhodiola rosea L.were divided into 3 different polarity fractions by ethyl acetate, normal butyl alcohol and water. activities of those were compared and assessed by reducing capacity, scavenging activities of superoxide anion radical (O2-), hydroxyl radicals (· OH) and inferior nitric acid root (NO-2). [Result] Different polarity fractions of Rhodiola rosea L .extracts showed antioxidant activities, while the antioxidant activity of which varied in different reaction systems and the differences like among different polarity fractions. Ethyl acetate fraction and normal butyl alcohol fraction had better reducing activity and scavenging activities on O2- · and OH than water fraction did.However, water fraction had better scavenging effects on NO-2 than ethyl acetate fraction and normal butyl alcohol fraction did. [Conclusion] Extra cts from Rhodiola rosea L.had strong antioxidant activity, which could be a good source of natural antioxidants