黑枣粉喷雾干燥工艺优化

Optimization of spray drying process of dateplum persimmon powder by response surface methodology

为改良黑枣粉的喷雾干燥效果,以河北省赞皇县普通黑枣为原料,采用响应面法优化酶解辅助喷雾干燥制备黑枣粉的工艺。结果表明:在复合酶(果胶酶和纤维素酶)添加量0.2%、温度45℃、pH 4.5、酶解90 min的条件下,可使黑枣中可溶性固形物得率达65.89%;将酶解液可溶性固形物含量浓缩至16%时,对其进行喷雾干燥,在进气温度176℃,阿拉伯胶添加量53%、入料流量818 mL/h条件下,黑枣粉平均得率为26.89%,并且含水率低于5%,适于长期存放。酶解与喷雾干燥相结合的方法能有效地应用于黑枣粉的加工。

In order to improve the drying effect of Dateplum persimmon powder through enzymatic hydrolysis followed by spray drying.The results showed that the total soluble solids contents of dateplum persimmon hydrolysate was 65.89%,when the hydrolysis was performed using 0.2% multi-enzyme（pectinase and cellulase）for90min at 45 ℃ and initial pH 4.5;after preconcentration to 16%,the hydrolysate was spray dried at an air-inlet temperature of 176℃,under adding the amount of gum Arabic of 53% and feed rate of818mL/h,resulting in a powder yield of 26.89% with water content smaller than 5%,and high suitability for long-term storage.Such combination of enzymatic hydrolysis and spray drying could be effectively used for the processing of dateplum persimmon powder.