摘要
以豆渣为原料,探讨了酶-碱结合法提纯豆渣纤维的工艺条件.结果表明,碱处理和蛋白酶处理的最佳工艺条件分别为:碱处理时间60 min、温度65℃、pH11,蛋白酶的添加量0.3%(w/w)、酶解时间1 h、酶解温度55℃、pH6,此时产品的得率为80.47%.对处理后豆渣的红外光谱和扫描电镜分析表明,酶-碱结合法可以有效去除附着在纤维表面的蛋白质、脂类等物质,使纤维表面变得光滑.碱处理后豆渣纤维的平均长度、宽度减少,蛋白酶处理后纤维长度和宽度基本没有变化,酶-碱结合处理后纤维的平均聚合度和分子量都有一定下降.
The soybean dreg fibers were prepared by the methods of alkaline solution extracting and enzymatic hydrolysis from byproduct of soymilk.The treatment conditions of alkali treatment and protease hydrolysis were discussed by orthogonal test.The results showed that the optimum technology condition of alkali treatment was that pH value was 11,soaking time was 60 min and soaking temperature was 65 ℃.The condition of protease hydrolysis was that the ratio of enzyme to substrate was 0.3%,pH value was 6,hydrolysis time was 1 h,the temperature was 55 ℃.Under the above conditions,the yield of product was 80.47%.The FTIR spectrum and SEM were indicated that the protein and lipid attached to the fiber surface,they could be effectively removed by alkaline solution extracting and protease hydrolysis and they made the fiber surface smooth.After alkali treatment the average length and width of soybean fiber decreased.However,the fiber length and width could not be changed obviously after protease hydrolysis.The average polymerization degree and molecular weight of soybean fibers decreased after alkali and protease hydrolysis.
出处
《陕西科技大学学报》
CAS
2017年第5期16-21,共6页
Journal of Shaanxi University of Science & Technology
基金
陕西省科技厅自然科学基础研究计划项目(2015JM3118)
浙江省废弃生物质循环利用与生态处理技术重点实验室开放基金项目(2016REWB20)
天津市制浆造纸重点实验室开放基金项目(201608)
陕西科技大学博士科研启动基金项目(BJ15-29)
关键词
豆渣
蛋白酶
碱处理
纤维特性
soybean dregs
protease
alkali treatment
fiber characteristic