Comparison of three different drying methods for yam slices

As one of the vegetables with high medical values,the drying product of yam has being one of the hottest studying fields. By the experimental studies of the yams dried by the hot air drying,the freezing-vacuum drying and the vacuum drying,the drying process,the rehydration ratio,Vc and the reducing sugar in the dried yams were compared. The results show that from the comprehensive consideration of energy consumption and quality,the method of the vacuum drying is the best among the hot air drying,the vacuum drying and the freezing-vacuum drying.