Optimization of the spray drying method in the application of DHA in formula milk powder

The effects of homogenization pressure, feed flow rate and inlet air temperature on the application of Docosahexaenoic Acid (DHA) in formula milk powder were studied by single factor experiment, then the process conditions of the application were optimized by response surface method (RSM) .The results showed that the effects of homogenization pressure, feed flow rate and inlet air temperature on the retention rate of DHA were significant (p<0.01) .By the RSM transactional analysis, the optimum process conditions were optimized as following:homogenization pressure 36 ~ 37MPa, feed flow rate 20.50mL/min, inlet air temperature 165℃, respectively.The retention rate of DHA was up to 95.28%±0.54% under the optimum condition.