[ Objective ] To provide references for the comprehensive utilization and deep processing of Cralaegus songorica K. Koch leaves. [Method] The total flavonoids were extracted from Crataegus songorica K. Koch leaves by ultrasonic wave, and the impact factors were analyzed by single factor and orthogonal experiments. [ Result ] The best ultrasonic extraction conditions were 80% ethanol concentration, 50 ℃ extraction temperature, 50 min extraction lime and 75 W extraction power, under the conditions, the yield of total flavonoids could reach up to 84.50% , and the influential degree of each impact factor decreased in the order of ethanol concentration > ultrasonic time > ultrasound power > ultrasonic temperature. [ Conclusion ] The total flavonoids from Crataegus songorica K. Koch leaves had strong radical scavenging ability and significant antioxidative activity.%[目的]为准噶尔山楂叶的综合利用和深度开发提供一定的参考.[方法]利用超声波法提取准噶尔山楂叶中的总黄酮,用总黄酮提取率作为衡量提取工艺的指标,对影响超声波提取的多个因子进行单因素、正交试验分析.[结果]准噶尔山楂叶中的总黄酮的超声波提取最佳条件为:乙醇浓度80％,提取温度50℃,提取时间50 min,提取功率75W,总黄酮的得率高达84.50％;影响总黄酮得率的主次因素依次为:乙醇浓度＞提取时间＞提取功率＞提取温度.[结论]准噶尔山楂叶总黄酮有较强的清除自由基能力,表现出明显的抗氧化性.
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