中文摘要：

目的：研究九州虫草体外不同极性部位的抗氧化作用。方法：采用DPPH法测定九州虫草石油醚（EVP）、乙酸乙酯（EVE）、正丁醇（EVB）和水（EVW）不同提取部位的抗氧化活性。结果：EVP,EVE,EVB,EVW均有DPPH自由基的清除能力,测得EVP,EVE,EVB和EVW清除DPPH的EC50值分别为190.2,141.4,151.6,195.4 mg·L-1。结论：九州虫草具有很强的抗氧化性,为进一步研究其抗氧化活性成分提供了科学依据。

英文摘要：

Objective：To investigate the antioxidant effect in vitro of Cordyceps kyushuensis.Method：Antioxidant capacity of the petroleum ether fraction（EVP）;acetic ether fraction（EVE）;n-butanol fraction（EVB）and water fraction（EVW）were determined using the DPPH assay in vitro.Result：EVP,EVE,EVB and EVW showed antioxidant capacity of eliminating DPPH free radicals,and the scavenging efficiency increase with the concentration increase.EC50 values of the EVP,EVE,EVB and EVW are 190.2,141.4,151.6,195.4 mg·L-1 respectively.Conclusion：C.kyushuensis shows great oxidation resistance,and the results of the antioxidant effect of the EVP,EVE,EVB,EVW provide a scientific basis to the research of active constituent and the exploitation of C.kyushuensis.