银杏叶中有效成分的微波提取及抗氧化活性研究

The process of extrating flavonoids from Gingko Biloba leaves by microwave and antioxidative activities research

用正交试验设计优选出银杏叶黄酮类化合物的微波提取工艺,并采用化学发光法对银杏叶的粗提物、正丁醇萃取物及其余水层清除自由基和抗氧化性能进行了研究.结果表明:当固液比(m/m)为1∶30,微波中档400 W浸提时间为1 h,然后70℃水浴浸提1 h,黄酮的提取率最高.3种提取物均有较强的抗氧化活性.其中粗提物的抗氧化活性比正丁醇萃取物好,同时发现萃取后的水层部分虽然黄酮类化合物含量很低,但也有较强的抗氧化活性.证明银杏叶提取物是一组复杂的、而又有相互协同增效作用的混合物,进一步分离纯化可能对提高其抗氧化活性作用不显著.

To select the best condition for microwave-assisted extraction of flavonoids from Gingko Biloba leaves by the orthogonal design,and abilities of scavenging free radicals of crude extract,the portion extracted by nbutanol and the aqueous portion remained of Gingko Biloba leaves by chemiluminescence has been researched.The result indicated that,when the ratio of fluid to solid is 1∶30,the power of microwave as 400?W;the extration period for 1 hour and the temperature as 70 ℃,the flavanones extraction rate are...