Objective: To study the relationship between the antioxidant activities and the contents of active ingredients in Radix Scutellaria.
Method: The antioxidant activities of extracts and active ingredients of Radix Scutellaria in NADPH-dependent lipid peroxidation in rat liver microsome were assayed.
Result: Extracts of Radix Scutellaria showed a 50% inhibition of lipid peroxidation in the concentration range of 2.72-18.27 mg x L(-1).
Conclusion: The antioxidant activities of extracts of Radix Scutellaria are not only related with the contents but also the ratio of the active ingredients.