酶解辅助喷雾干燥法制备速溶米糠粉工艺研究

Study on the Preparation of Instant Rice Bran Powder by Enzymatic Hydrolysis Followed by Spray Drying

为获得溶解性和冲调性较好的米糠粉,以全脂米糠为原料,采用酶解结合喷雾干燥的方法制备速溶米糠粉,利用响应面法优化酶解液喷雾干燥的条件,并对米糠粉的速溶性指标进行测定。结果显示:在α-淀粉酶添加量4 000 U/g、温度60℃、pH 6.5、酶解时间90 min的条件下,米糠液中可溶性碳水化合物达25.13%;米糠酶解液喷雾干燥的条件为:进风温度160℃、热风流量31.40 m^3/h、进料流量360 mL/h,此条件下,米糠出粉率最高,达到43.69%。所制备的米糠粉冲调性较好,色泽风味具佳。

To obtain better solubility and reconstituability rice bran powder, the whole rice bran hydrolysate liquid was taken as raw material through enzymatic hydrolysis followed by spray drying. Response surface methodology was adopted to research spray drying process for RBHL（rice bran hydrolysate liquid）, and the in- stant property of the power product were determined. Results showed that the total soluble carbohydrate content of RBHL was 25.13 % when the hydrolysis was performed using 4 000 U/g s-amylase for 90 rain at 60 ℃ and pH 6.5. The RBHL was spray dried at an air-inlet temperature of 160 ℃, air flow rate of 31.40 m3/h, and feed- ing rate of 360 mL/h, resulting in a powder yield of 43.69 % with good solubility, color and flavor.