响应面法优化超声提取八角茴香油工艺

利用响应面法对超声提取八角茴香油的工艺进行优化，在单因素实验的基础上，根据中心组合设计原理，采用三因素三水平的响应面分析法，依据回归分析确定最优提取工艺条件。选取超声提取时液料比和温度为随机因子。结果表明，八角茴香油超声提取的最佳工艺条件为：提取时间45min，提取温度28℃，液料比（mL／g）为54：6。采用该工艺条件，八角茴香油的提取率可达到14．54％。验证试验值为14．40％，与理论值相对误差为0．96％。

Optimization of ultrasonic extraction of star aniseed oil by using response surface method

Based on the single factor experiment, the response surface method with three factors at three levels is adopted according to the principle of central compages design. The factors of optimum conditions for the extraction will be determined by regression analysis. We choose the time of extraction, the ratio of solvent to material and temperature as random fators. The result showed that the optimum conditions for the ultrasonic extraction are as follows.the time of extraction is 45 min, the temperature is 28 ℃ and the ratio of solvent to material is 54 ： 6（mL/g）. Under the optimum conditons, the extraction yield of star aniseed oil from star aniseed is 14.54% while the experimental data is 14.40% with relative error 0.96% compared with theoretical value.