Optimization of spray drying technology in processing arrowhead powder

The effects of drying aids on the powder yield of arrowhead enzymatic hydrolysate were investigated. Based on the optimal dose of drying aids,the optimum drying parameters including inlet temperature,feed flow rate and hot air flow rate in the process were determined by using the powder yield,water content and sensory score of arrowhead powder as the evaluation indexes. The results showed that when the addition of maltodextrin was 40%,the inlet temperature was 180 ℃,the feed flow rate was 25% and the hot air flow rate was 36 m³/h,the powder yield was 48.51%±0.63% which was 31.32% higher than that without adding drying aids and the water content was 4.86%±0.07%. Meanwhile the sensory characteristics of the arrowhead powder were best with milky white,fine and uniform powder,strong flavor and good tonality. It was concluded that the combination of drying aids and spray drying technology could effectively improve the yield and quality of arrowhead powder.