Study on Antioxidant Activity and Lipid-lowering Effect of Ethanol Extract and Its Different Solvent Extracts from the Stem and Leaves of Scutellaria amoena / 中国药房

ABSTRACT

OBJECTIVE：To study the antioxidan t activity and lipid-lowering effect of ethanol extract and its different solvent extracts from the stems and leaves of Scutellaria amoena . METHODS ：The stem and leaves of S. amoena was extracted with 95％ ethanol to obtain ethanol extract ，and then extracted with petroleum ，ethyl acetate and n-butanol to obtain corresponding different solvent extracts. Using vitamin C （Vc）as positive control ，the antioxidant activities of ethanol extract ，petroleum ether extract ， ethyl acetate extract and n-butanol extract from the stems and leaves of S. amoena were determined by hydroxyl radical ，superoxide anion radical and DPPH radical scavenging method ，and the IC 50 was calculated. Steatosis L 02 hepatocyte model was established with fat emulsion. Using fenofibrate （20 μg/mL）as positive control ，the effects of high and low concentration （100 and 50 μg/mL） ethanol extract ，ethyl acetate extract and n-butanol extract from the stems and leaves of S. amoena on the contents of TC and TG in cells were investigated. RESULTS ：The order of scavenging ability to hydroxyl radicals was n-butanol extract ＞ethyl acetate extract＞Vc＞ethanol extract ＞petroleum ether extract ；IC50 of them were 0.15，0.17，0.35，0.75，1.17 mg/mL，respectively. The order of scavenging ability to superoxide anion radical was Vc ＞n-butanol extract ＞ethyl acetate extract ＞ethanol extract ＞ petroleum ether extract ；IC50 of them were 0.034，0.55，0.75，3.32，3.73 mg/mL，respectively. The order of DPPH scavenging ability to DPPH radical was Vc ＞n-butanol extract ＞ethyl acetate extract ＞ethanol extract ＞petroleum ether extract ；IC50 of them were 0.003 2，0.028，0.033，0.048，0.057 mg/mL， respectively. The ethanol extract ，ethyl acetate extract and n-butanol extract from the stems and leaves of S. amoena could significantly decrease the contents of TC and TG in steatosis L 02 hepatocytes （P＜0.01）. The order of lipid-lowering ability was n-butanol extract （low dose ）≈fenofibrate＞ethyl acetate extract （high dose ）＞ethanol extract （high dose ）＞ n-butanol extract （high dose ）＞ethyl acetate extract （low dose ）＞ethanol extract （low dose ）. CONCLUSIONS ：The ethanol extract ， petroleum ether extract ，ethyl acetate extract and n-butanol extract from the stems and leaves of S. amoena show good antioxidant activity and lipid-lowering effect （except for petroleum ether extract ）. Ethyl acetate extract and n-butanol extract possess the strongest antioxidant activity and lipid-lowering effect.