多孔淀粉是生淀粉酶在低于淀粉糊化温度下水解各种淀粉形成的一种中空的变性淀粉.作为一种高效、无毒、安全的新型有机吸附剂被广泛用于食品、医药、农业、化妆品、造纸等行业.超声波微波协同组合条件下改进传统酶水解法来制备玉米多孔淀粉.超声波微波协同组合条件下改进传统酶水解法来制备玉米多孔淀粉.采用单因素和L18(37)正交实验,考察温度、时间、超声波功率等对吸油率的影响.结果表明:时间45min,微波功率150W,超声波功率400W,温度56℃,α-淀粉酶加酶量为8U/g,糖化酶与α-淀粉酶配比为6∶1,柠檬酸缓冲液pH为5.4,此时吸油率最高.通过SEM观察,发现多孔淀粉呈蜂窝状,表面孔的数目较多,孔密度均一,孔径不大但孔深适中,同时比表面积增大,颗粒较完整.%Porous starch is a modified hollow starch. It can be produced by hydrolyzing raw starch with enzymes at the temperature lower than starch gelatinization. It is widely used as a sorbent in many industries such as food, medicine, agriculture, cosmetics paper making due to its high efficiency, no toxicity and safety. In the conditions of ultrasonic collaborate with microwave, the traditional method of enzyme hydrolysis com starch was improved. The single factor and orthogonal experiment Llg (3 ) were designed to investigate the influence of temperature, time, as well as ultrasonic power to oil absorption rate. The results show that the best absorption rate was under the condition of; microwave power 150 W, ultrasonic power 400 W, temperature 561 and reaction time 45 min, a -amylase enzyme 8 U/g, glucoamy-lase and a - amylase ratio 6:1, citric acid buffer liquid pH 5.4. SEM verified honeycomb like structure and abundance surface hole with uniformed hole density. The diameter of the hole was very small but moderate. The surface area was increased and the granules were all kept well.
展开▼
