In order to investigate the effects of atmospheric pressure microwave drying equipment, vacuum microwave drying, blast drying and vacuum drying on the active ingredients of winter melon peel, the variation trend of water ratio curve of wet samples of winter melon peel was studied, and the dry samples of winter melon peel dried by these four drying methods and freeze drying method were compared. The contents of flavonoids, polyphenols and three terpenoids of active substances were different.
The results showed that with the increase of drying power or temperature, the drying rate of wet samples of wax gourd peel increased. Under the same power or temperature conditions, the drying rate of vacuum microwave was faster than that of atmospheric microwave, and the drying rate of vacuum microwave was slightly faster than that of blast drying. The order of the four drying methods is vacuum microwave drying > vacuum drying > atmospheric microwave drying > blast drying.
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