添加胡萝卜纤维素对喷雾干燥荔枝果粉特性的影响

Effect of addition of carrot fiber on properties of litchi juice powder with spray drying

以胡萝卜纤维素作为干燥载体,采用单因素实验和正交实验设计,探讨不同载体添加比例、物料浓度、物料流量、热风温度等喷雾干燥工艺条件对荔枝果粉的含水量、堆积密度、吸湿性、分散性和感官属性等指标的影响。结果表明,荔枝果汁喷雾干燥优化的工艺参数:20 MPa压力下均质15 min,干燥载体胡萝卜纤维素和麦芽糊精添加量分别为15%和22.5%,果汁物料浓度为25%,物料流量为25 m L/min,物料温度为50℃,热风温度为175℃,样品的水分含量为3.24%,堆积密度为0.512 g/m L,吸湿性为0.038%,流动性为53.6°,分散性94 s,感官质量良好。

The feasibility of addition of carrot fiber as a carrier on properties of litchi juice powder with spray drying was studied. The effects of processing parameters such as the ratio of carriers,feeding concentration,flow rate, inlet air temperature on physical properties（ e. g., moisture content, density, hygroscopicity and dissolution） of the powders were examined. Based on the results obtained from single factor experiments,an orthogonal experiment was designed to optimize the processing conditions of spray drying of litchi powder.The optimal spray drying processing conditions was shown as follows：homogenization pressure of 20 MPa with15 min,carrot fiber of 15% and maltodextrin of 22.5% was used as drying carrier,feeding concentration 25%,flow rate of 25 m L/min,feeding temperature of 50 ℃,inlet air temperature of 175 ℃. Under these conditions,the response values were moisture content of 3.24%,density of 0.512 g/m L,hygroscopicity of 0.038 %,flowability of53.6°,dissolution of 94 s,respectively.