喷雾干燥与冷冻干燥玉米肽工艺的比较研究

以酶解法制备的玉米肽为原料，对其冷冻干燥和喷雾干燥的工艺进行研究。确定冷冻干燥条件为预冷温度－30℃，预冷时间2h；加热温度从－10℃开始18h后缓慢升温，达到25℃，并保持到干燥终点。喷雾干燥的最佳工艺参数为进风温度180℃，进样速度为30ml/min，离心雾化器转速为20000r/min。并对两种干燥方法制得产品的理化特性进行了比较。

Comparison of Freeze Drying and Spray Drying for Corn Peptides

In order to obtain optimal technological processing for drying of corn peptides, comparison between freeze drying and spray drying was conducted to use corn peptides prepared by enzymatic hydrolysis as materials. Results indicated the optimal processing parameters of freeze drying were －30 ℃ of pre-treatment temperature, 2 h of pre-treatment time, initial heating from －10 ℃ with a gradient temperature increase for 18 h, final temperature at 25 ℃ until the end-point of drying. On the other hand, the optimal processing parameters for spray drying were 180 ℃ of inlet temperature, 30 ml/min of flux rate and 20000 r/min of rotating speed. Physicochemical properties of corn peptides using both drying methods were also compared. Although no obvious difference on physicochemical properties of corn peptides dried by both methods was observed, spray drying technology is catachrestic of low cost and high productivity.