Objective: To study the effects of different drying processes on the quality of Dendrobium nobile leaves, and to provide theoretical basis for improving the initial processing and expanding the medicinal parts of Dendrobium nobile.
METHODS: Dendrobium nobile leaves were dried by hot air drying, microwave drying equipment, vacuum drying and vacuum freeze drying. The effects of four drying methods on color, microstructure, total polysaccharides and content of Dendrobium nobile leaves were investigated.
Result: The color of vacuum freeze-drying product was the best, which was superior to the other three drying methods. Different drying methods have different microstructures. The total polysaccharide content of Dendrobium nobile leaves after vacuum freeze drying, vacuum drying, hot air drying and microwave drying were 3.11%, 3.02%, 2.81% and 2.74%, respectively. Different drying processes have great influence on the content of total polysaccharides in Dendrobium nobile leaves, but little influence on the content of Dendrobium alkali.
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