地黄叶浸膏微波真空低温干燥工艺优化

为充分利用地黄叶资源，提高其经济附加值并为植物提取物干燥提供方法。采用单因素试验考察微波功率、干燥时间等因素对干燥产物含水率的影响，在单因素试验的基础上，选用L9(34)正交试验法和多指标综合评分法对工艺参数进行优化，确定地黄叶浸膏微波真空低温干燥的最佳工艺条件，并与真空烘箱干燥、真空带式干燥和冷冻干燥等方法进行比较研究。结果表明：地黄叶浸膏微波真空低温干燥的最佳工艺条件为浸膏初始含水率45%、微波功率2kW、干燥时间18min、装料盘转速90r/min、间歇比3:1、装载量110g；在此工艺条件下干燥产物含水率2.89%、毛蕊花糖苷保留率95.98%、地黄叶总苷保留率89.41%。与其他干燥方法相比，微波真空干燥具有干燥产品含水率低、有效成分损失少、干燥时间短且操作简便等优点，工艺稳定可靠，有较大的工业化应用价值。

Optimization of Microwave Vacuum Low-temperature Drying Process for Rehmannia glutinosa Libosch Leaves Extract

In order to make full utilization of Rehmannia glutinosa Libosch leaf resource,improve its added value and provide optimal drying method for Rehmannia glutinosa Libosch leaves extract,single-factor design was used to explore the effects of microwave power and drying time on water content of dried products,followed by process optimization for the microwave vacuum drying of the extract by orthogonal array design based on multi-index comprehensive evaluation.Results indicated that the optimal microwave vacuum ...