小麦麸皮戊聚糖高温提取反应动力学及工艺优化

Research on reaction kinetics and process optimization of high temperature extraction of wheat bran pentosan

采用高温酸水解法提取麸皮中戊聚糖,通过单因素试验确定料液比、酸种类、酸浓度的最优条件,并对小麦麸皮半纤维素的水解反应动力学进行研究,最后采用正交试验来确定戊聚糖提取的最优工艺条件。结果表明:高温可明显提高戊聚糖提取率,麸皮戊聚糖溶解和降解活化能分别为74.81、83.05 kJ/mol;最优工艺条件为料液比1:20(g/mL),0.006 mol/L乙酸于180℃下反应25 min。此时,可溶性戊聚糖浓度达到15.19 g/L,可溶性戊聚糖的产率达到18.96%。

The high temperature and acid hydrolysis of extracting pentosan from wheat bran was studied. The solid-liquid ratio, acid species and concentration were selected by single factor test. And the kinetics of wheat bran hemiceUulose hydrolysis reaction was studied. Finally, the soluble pentosan extraction process was optimized by orthogonal tests. The results indicated that high temperature could improve the rate of soluble pentosan extraction obviously, and hemiceIlulose dissolution and degradation activation energy were 74.81 and 83.05 kJ/mol, respectively. The optimal extraction condition were as follows： 1 ： 20 （g/mL） of solid-liquid ratio, 0.006 mol/L of acetic acid concentration, 180℃ heating for 25 min. The concentration of soluble pemosan reached 15.19 g/L while the soluble pentosan yield reached 18.96 %.