Abstract:

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. 

Key words: corn peptides, spray drying, freeze drying