大麦苗粉的热风与微波联合干燥工艺优化

Optimization of combined drying process by hot-air and microwave for barley seedling powder

中文关键词:  大麦苗粉  热风干燥  微波干燥  联合干燥  响应面分析法

英文关键词:barley seedling powder  hot-air drying  microwave drying  combined drying  response surface analysis

中文摘要:

      目的 探索大麦苗粉的快速干燥方法。方法 分别使用热风干燥(hot-air drying, AD)和热风-微波(microwave drying, MD)联合干燥(AD+MD)方式对大麦苗粉的干燥工艺进行研究。考察干燥过程中热风温度、微波功率、转换点含水率对叶绿素、总黄酮含量的影响。结果 最佳联合干燥工艺条件为: 热风温度66.2 ℃, 微波功率231 W, 转换点含水率50.91%, 此时测得叶绿素含量为(6.006±0.192) mg/g, 与理论预测值的相对误差为-0.77%; 总黄酮的含量为(5.695±0.145) mg/g, 与理论预测值的相对误差为-1.18%。与热风干燥相比, 联合干燥的大麦苗粉中营养成分含量分别提高了3.69%、13.04%, 干燥时间缩短了22%。结论 热风与微波联合干燥是大麦苗粉干燥的一种较优方法, 为大麦苗粉的干燥加工提供科学参考。

英文摘要:

      Objective To establish a rapid drying method for barley seedling powder. Methods Hot-air drying and hot-air and microwave combined drying technology were used. The effects of hot-air temperature, microwave power and moisture content of conversion point on the content of chlorophyll and total flavonoids were investigated. Results The optimum combined drying conditions were as following: hot-air temperature was 66.2 ℃, microwave power was 231 W, and moisture content of conversion point was 50.91%. Under these conditions, the content of chlorophyll was (6.006±0.192) mg/g, with the relative error of the predicted value of -0.77%, and the content of total flavonoids was (5.695±0.145) mg/g, with the relative error of the predicted value of -1.18%. Compared with hot-air drying technology, the content of chlorophyll and total flavonoids in barley seedling powder dried by hot-air and microwave combined drying technology were increased by 3.69% and 13.04%, and the drying time was reduced by 22%. Conclusion The combined drying technology of hot-air and microwave is a better method for drying barley seedling powder, which provides a scientific reference for the drying process of barley seedling powder.