无花果果丁真空冷冻干燥工艺研究

Study on Vacuum Freeze-drying Process of Diced Figs

本文研究了粒径、物料厚度、加热温度等因素对对无花果果丁真空冷冻干燥加工的影响。结果表明,随着无花果果丁粒径的减小,物料的共晶点呈下降趋势,而物料的冻结速率随果丁粒径的减小所提高。通过比较优化,确定了无花果果丁冻干加工的适宜粒径为0.5cm,此时物料的共晶点为21℃,物料厚度为2-3 cm,冻干的加热温度为40℃,在此工艺条件无花果果丁冻干加工的成品率为88.40%,成品的含水量为4.21%。

The effects of particle size,material thickness and heating temperature on vacuum freeze-drying of fig dice were studied.The results showed that the eutectic point of fig dice decreased with the decrease of particle size,while the freezing rate of fig dice increased with the decrease of particle size.The optimum size ofdiced figs is 0.5 cm with the eutectic point21℃by comparing the optimal results,the thickness of the material is 2-3 cm,and the heating temperature is 40℃.Under this technological condition,the yield of the freeze-drieddicedfigs product is 88.40%with the moisture content 4.21%.