Multi-index evaluation of the effect of different drying methods on the quality of Beiqing Longyi

1. Objective: To study the effect of different drying methods on the quality of Beiqing Longyi, and to optimize the best drying method of Beiqing Longyi.

   microwave drying equipment

   METHODS: After five drying methods (shade drying, sun drying, drying, microwave drying equipment, freeze drying) and different drying temperatures (40, 50, 60 C) under different drying methods, Beiqinglongyi was treated with drying time, rehydration rate, water content, alcohol extract content, effective components of walnut quinone and walnut ketone and their methanol extracts on human gastric adenocarcinoma BGC 823 cells and human lung cancer A54 cells. The effect of different drying methods on the quality of Beiqinglongyi was compared and analyzed.

   

   Result: Among the five drying methods, microwave drying time was the shortest and shade drying time was the longest; freeze-drying sample had the largest moisture content and microwave drying sample had the smallest moisture content; the content of alcohol extract had little difference; the content of walnut quinone was the highest in freeze-drying sample and the lowest in microwave drying sample; the content of walnut ketone was the highest in drying sample at 40 C and the lowest in freeze-drying sample in vitro. Tumor test showed that freeze-drying > drying at 40 C > shade-drying were the drying methods according to the growth inhibition rate of the two kinds of cells, and the inhibition rate decreased with the increase of drying temperature.

     Beiqing Longyi microwave drying