响应面法优化玉米芯中木聚糖的提取工艺

为提高玉米芯中木聚糖的得率，采用响应面法优化碱法提取玉米芯中木聚糖的工艺条件，对碱液质量浓度、固液比、处理时间、处理温度4个因素进行单因素试验。根据单因素试验结果设计中心组合试验，以木聚糖得率为指标值，采用响应面分析法确定最优工艺参数。结果表明：NaOH溶液的质量浓度为25g/100mL、固液比1:25(g/mL)、94℃抽提3h，在上述条件下木聚糖得率为24.39%，比单因素试验的最高得率20.35%高出19.85%，与模型的预期值24.41%基本相符。响应面优化法能够提高玉米芯的木聚糖得率。

Optimization of Extraction Process for Xylan from Corncob by Response Surface Methodology

Response surface methodology was used to optimize the conditions for alkaline extraction of xylan from corncob with the aim of maximizing the yield of xylan. The effects of NaOH concentration, solid-to-liquid ratio, extraction time and temperature on the yield of xylan were studied in single factor experiments. Subsequently, a regression model for the yield of xylan was established using a central composite design involving the above four factors at five levels and based on the model, response surface analysis was carried out to find out the optimum levels of these four factors. The results indicated that the optimum extraction conditions were NaOH concentration of 25 g/100 mL, solid-to-liquid ratio of 1:25, temperature of 94 ℃ and extraction time of 3 h. Under such conditions, the experimental yield of xylan was 24.39%, which was basically consistent with the predicted one of 24.41% and increased by 19.85% than the maximum one of 20.35% obtained in single factor experiments.