【摘要】 为了确定真空冷冻干燥的工艺参数,采用电阻法测量黄瓜真空冷冻干燥的物料共晶点,并应用正交试验,以冻干品干燥速率标进行评定考察冻干效果,优化真空冷冻干燥工艺参数。结果表明:黄瓜真空冷冻干燥物料的共晶点温度为-24.0℃,加热温度为50℃、物料厚度为4 mm、干燥室压力为60 Pa,应用该优化的技术工艺可达到最大干燥速率。更多还原

【Abstract】 In order to confirm the optimum technological parameter in vacuum freeze-drying of cucumber,experiments were conducted with cucumber.The eutectic point of cucumber was determined by electrical resistance method in the vacuum freeze-drying.The technologies of the vacuum freeze-drying of cucumber were optimized with the orthogonal experiments,and according to evaluating the effects of the velocity of vacuum freeze-drying indexes in the process.The results showed that the eutectic point of cucumber were-24 ℃ in the vacuum freeze-drying.The optimized combination of factors is heating temperature 50 ℃,material thickness 4 mm,pressure of drying house 60 Pa.With the optimal technology,the velocity of vacuum freeze-drying could be saved as far as possible.更多还原