Method for drying traditional Chinese medicine materials in mixing mode through microwave vacuum and hot air

Abstract

A method for drying traditional Chinese medicine materials in mixing mode through microwave vacuum and hot air comprises placing the traditional Chinese medicine materials in a microwave vacuum drying stove, drying the traditional Chinese medicine materials for 3 to 5 minutes under the condition that the vacuum ranges from 0.07Mpa to 0.09Mpa and the unit microwave power ranges from 3W to 5W, delivering the traditional Chinese medicine materials into a hot air dryer, drying the traditional Chinese medicine materials for 1 to 3 hours under the temperature ranging from 70 DEG C to 90 DEG C, and finally delivering the traditional Chinese medicine materials to the microwave vacuum drying stove again for drying under the condition of the first step till the end. The method adopts mixing of the microwave vacuum drying and the hot air drying, enables the internal structure of the traditional Chinese medicine materials to achieve the effect of swelling, loosening and cracking, improves exudation ratio of decoction of liquid medicine and shortens decoction time without damaging contents of the traditional Chinese medicine materials. Further the method can keep intrinsic body integrity of the traditional Chinese medicine materials, reduces contractibility rate of the traditional Chinese medicine materials, accelerates rehydration of the traditional Chinese medicine materials, improves product quality and reduces energy consumption.

Description

technical field [0001] The invention relates to a drying method for Chinese medicinal materials, in particular to a method for drying Chinese medicinal materials by mixing microwave vacuum and hot air. Background technique [0002] my country has a long history of research on the drying methods of Chinese medicinal materials. As early as the 1st-2nd century AD, the earliest extant monograph on Chinese medicinal materials "Shen Nong Baicao Jing" already had "shade-drying, exposure-drying, harvesting and processing" of Chinese medicinal materials. This is the most economical method, and the cost is relatively low. However, there are many technical problems, such as long drying time, large damage to active ingredients, easy mildew and deterioration in rainy weather, and easy contamination by dust, flies, and rats. Modern hot air drying is mostly used, and the production cost is low, so it is widely used, but the loss of active ingredients is large, and even serious quality decl...

AI Technical Summary

Problems solved by technology

However, hot air drying gradually heats Chinese herbal medicines from the outside to the inside. A certain temperature difference must be established and maintained to ensure the migration and diffusion of water from the inside to the outside. Therefore, the hot air temperature is the main factor affecting the hot air drying speed, but at the same time there are serious defects. : The drying temperature is high, the drying time is long, the quality of the product, such as heat-sensitive nutrients, will be lost to a certain extent, and quality defects such as surface crusting cracks, fat oxidation, and surface discoloration are prone to occur, thereby affecting the uniformity of product quality and storage resistance.

[0006] As far as domestic patents related to the processing of Chinese herbal medicine products are concerned, Liu Xuesong invented a method for preparing the dried product of rehmannia glutinosa extract (Chinese invention patent, application number: 201010514049.0), using a microwave dryer to dry rehmannia glutinosa under vacuum. The extract is dried, the whole drying time is short, and the dried product obtained is a medium with uniform pores, which has the advantages of light color and low moisture content, but poor solubility

Zhou Mingqian invented a microwave vacuum processing method for Chinese herbal medicines (Chinese invention patent, application number: 201010504383.8), put Chinese herbal medicines into a microwave vacuum drying oven and heat them to achieve the effect of expansion, softness and fracture of the internal structure of the medicinal materials without destroying The ingredients of traditional Chinese medicine can also maintain the original physical integrity of the medicinal materials, but the production cost is high