Freezing drying method and drying device thereof

Abstract

The invention discloses a freezing drying method. The freezing drying method comprises the following steps that dendrobium officinale is picked, cleaned and drained, color-protecting liquid is used for ultrasound soaking, and the dendrobium officinale is taken out and drained for being dried; the dendrobium officinale is placed in a drying device, then air in the drying device is completely pumpedout, and then nitrogen is pumped into the drying device to enable the interior of the drying device to keep a nitrogen atmosphere; and internal gas in the drying device is pumped out to enable air pressure of the drying device to be lower than barometric pressure, the interior of the drying device is vibrated and heated up, after it is observed that the internal air pressure in the drying devicerises to the barometric pressure, the nitrogen is pumped and a gas outlet is simultaneously opened to enable internal vapor in the drying device to escape, then the gas outlet is closed to pump the air pressure in the drying device to be lower than the barometric pressure, warming evaporation is carried out again, and until the dendrobium officinale is completely dried after reciprocation. According to the freezing drying method, the dendrobium officinale is dried at the nitrogen atmosphere, the drying device can sufficiently freeze and dry the dendrobium officinale, and low-temperature dryingdoes not damage the own nutrition of the dendrobium officinale.

Description

technical field [0001] The invention relates to the technical field of freeze-drying of traditional Chinese medicine or plants, in particular to a freeze-drying method and a drying device thereof. Background technique [0002] Dendrobium candidum, also known as black knot grass, is a precious and endangered medicinal material, belonging to the aerial orchid family herb. It is called "the giant panda in the medicine world" by the international medicinal plant community, and is called "life-saving fairy grass" by the people. Although fresh Dendrobium candidum has high nutritional and medicinal value, its storage time is short, and it has strict requirements on storage temperature, humidity and storage conditions, which has brought certain restrictions to practical use. However, traditional drying and drying can prolong the storage time, but the effective physiologically active ingredients are also affected, and the effective ingredients such as polysaccharides are decreasing, ...

AI Technical Summary

Problems solved by technology

Although fresh Dendrobium candidum has high nutritional and medicinal value, its storage time is short, and it has strict requirements on storage temperature, humidity and storage conditions, which has brought certain restrictions to practical use.

However, although the traditional drying and drying can prolong the storage time, the effective physiologically active ingredients are also affected, and the effective ingredients such as polysaccharides are decreasing, resulting in a decline in its efficacy and affecting its medicinal value.

And the existing Dendrobium candidum freeze-drying device is prone to the situation of incomplete drying or insufficient freezing when carrying out batch processing, and the Dendrobium candidum after processing is easily damaged.

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