关键词: 抗氧化剂, 乌桕, 乌桕叶抽提物, 类黄酮

Abstract: To exploit Chinese tallow resource with native characteristics and to use its leaf synthetically, antioxidant-rich fractionswere extracted respectively from Chinese tallow leaf by various solvents, such as water at 90℃, 70% ethanol in water and ethylacetate (EtOAc). The antioxidant activities of the extracts were evaluated respectively by hydroxyl radical scavenging activitymethod, the linoleic acid peroxidation prevention method and reducing power method. At 4 mg/ml concentration, various extractswith 90℃ water and 70% ethanol in water showed 42.42%～63.62% and 20.71%～54.49% hydroxyl radical scavenging activityrespectively. These extracts also showed good reducing power at 200μg/ml concentration, equal to 2×10-4mol/L Tu, by the potassiumferricyanide reduction method. The extract with EtOAc was superior to the others in preventing the peroxidation of linoleic acid.Chinese tallow leaves extracts might be exploted for antioxidant and health supplements.

Key words: antioxidant activity, sapium sebiferum, chinese tallow leaf extracts, flavonionds