中文摘要：

【目的】采用响应面分析法优化发酵虫草菌粉多糖的提取工艺。【方法】在单因素实验的基础上选取因素与水平,根据中心组合实验Box-Behnken设计原理采用3因素3水平的响应面分析法设计实验。【结果】各因素对多糖提取率的影响次序为：提取温度〉提取时间〉料液比;通过经典分析确定了发酵虫草菌粉最佳提取工艺为：提取温度为95℃,料液比为1∶21,提取时间为73 min。在这样的环境下发酵虫草菌粉多糖提取率理论值为4.31%,实际提取率为（4.20±0.1）%。【结论】响应面分析法用于优化发酵虫草菌粉多糖的提取工艺可行,建立的数学模型与实验数据相符。

英文摘要：

Objective To optimize the extraction process for the polysaccharide from fermented Cordyceps Sinensis powder with response surface methodology. Methods We selected the factors and levels on the basis of single factor experiment,and then designed the experiment with 3 factors and 3 levels based on the principle of Box-Behnken＇s design. Results The effect of the factors of extraction temperature, time and solid-liquid ratio on extraction ratio was in decreasing sequence. The optimal extraction technology obtained through the classical analysis was as follows：extraction temperature at 95 ℃,the ratio of solid to liquid being 1 ∶ 21,and extraction for 73 min. Under this condition the theoretical extraction rate was 4.31% and the actual extraction rate was（4.20 ± 0.1）%. Conclusion The obtained values agree with the predicted values of the mathematic models,and the Box-Behnken experimental design is suitable for optimizing the extraction of the polysaccharide from fermented Cordyceps Sinensis powder.