中文摘要：

以火麻籽为原料,对碱提酸沉法提取火麻蛋白工艺参数进行研究,在单因素试验的基础上,采用响应面分析法对提取温度、提取时间、提取pH和料液比进行优化并得到回归模型。确定的碱提酸沉法提取火麻蛋白最佳工艺参数为：提取温度60℃,提取时间1 h,提取pH 10,料液比1∶9。在最佳工艺条件下,火麻蛋白的提取率为63.5%。回归模型的预测值与实测值的相对误差为2.3%,该回归方程与实际情况拟合较好。DSC分析得出火麻蛋白的变性温度为83.0℃,纯化后的火麻蛋白相对分子质量分布均小于40 k Da。

英文摘要：

With hemp seed as raw material, the process parameters of alkali extraction and acid precipita- tion of hemp protein were studied. On the basis of single factor experiment, the extraction temperature, extraction time, extraction pH and ratio of material to liquid were optimized by response surface methodolo- gy, and the regression model was finally established. The results showed that the optimal parameters of alkali extraction and acid precipitation of hemp protein were obtained as follows：extraction temperature 60℃ ,extraction time 1 h ,extraction pH 10 and ratio of material to liquid 1：9. Under the optimal conditions, the extraction rate of hemp protein was 63.5%. The relative error between predictive value and experimental value of the regression model was 2.3 %, indicating a good fit between regression equation and actual situation. The DSC analysis results showed that the denaturation temperature of hemp protein was 83.0℃, and the relative molecular weight distributions of purified hemp protein were less than 40 kDa.