玉米芯中水溶性膳食纤维的微波预处理-超声波碱解法提取工艺研究

摘要

采用正交实验对玉米芯中水溶性膳食纤维(SDF)的微波预处理-超声波碱解法提取工艺进行优化,以SDF得率为考察指标.结果表明,最佳微波预处理工艺超声波碱解法提取工艺条件为:原料粉碎粒度60目,解吸剂比7∶1 mL/g,微波功率560 W,微波时间150 s,NaOH浓度0.8%,液料比30∶1 mL/g,超声波功率200 W,提取温度50 ℃,提取时间35 min.该工艺条件下,SDF得率为4.75%.与超声波提取法相比,采用微波预处理并结合碱解法,可有效提高玉米芯中SDF的超声波提取效率.微波预处理-超声波碱法提取技术具有省时高效的特点,特别适用于玉米芯SDF的提取.%Using orthogonal experiment to study the microwave pretreatment-ultrasonic alkali extraction technology of soluble dietary fiber(SDF)from corn cob,SDF yield as index.The optimum technological conditions of microwave pretreatment-ultrasonic alkali extraction technology were as followed:particle size of peony seed powder 60 meshes,analytical agent ratio 7∶1 mL/g,microwave power 560 W,microwave time 150 s,NaOH concentration 0.8%,liquid/solid ratio 30∶1 mL/g,ultrasonic power 200 W,extraction temperature 50 ℃,extraction time 35 min.Under the optimum conditions,the SDF yield was 4.75%.Compared with ultrasonic extraction,the microwave pretreatment combined with alkali solution could effectively improve efficiency of ultrasonic extraction of SDF from corn cobs.Microwave pretreatment-ultrasonic alkali extraction technology,which has many advantages such as saving time and high efficiency,is especially suitable for the extraction of SDF from corn cobs.