Microwave vacuum drying can solve the problem of drying Chinese herbal extract

- May 03, 2019 -

Drying is an important link in the production of traditional Chinese medicine. It is widely used in the production of pharmaceutical excipients, raw materials, intermediates and finished products, especially in the drying of extracts of traditional Chinese medicine. Its operation directly affects the performance, quality, appearance and cost of products. At present, the drying of the extract mainly depends on the traditional drying equipment, such as hot air circulation oven and vacuum drying box. In recent years, spray drying, vacuum freeze drying, microwave vacuum drying and other new drying technologies have been applied in the drying process of Chinese medicine extract.

Because of the high viscosity and poor air permeability of traditional Chinese medicine extract, there are some shortcomings in the drying process of traditional Chinese medicine extract, such as long drying time, low output, high energy consumption, low production efficiency and low product quality, which are far from meeting the requirements of modern Chinese medicine for high efficiency, energy saving, environmental protection and advanced drying process of traditional Chinese medicine extract. The microwave vacuum drying equipment, which has sprung up in recent years, can effectively solve the problem of drying Chinese herbal extracts. After drying by microwave vacuum dryer, the micro-porous particles were observed from the micro-structure. After directly crushing to the required particle size, the fluidity of the particles is very good, which can be directly pressed or filled with capsules. At the same time, because of the micro-loose structure of the particles, the instant solubility of the particles is excellent, and the appearance of the particles is good, for instant (granule) products, the product grade can be greatly improved. The whole drying process is completely closed, not in contact with the external environment, in line with GMP. Characteristics of microwave vacuum drying equipment for extracts of traditional Chinese medicines:

(1) low drying temperature, suitable for drying heat-sensitive extracts of traditional Chinese medicines;

(2) suitable for drying oxidizable extracts of traditional Chinese medicines;

(3) suitable for drying high-concentration, high-viscosity extracts of traditional Chinese medicines;

(4) good solubility of products; after drying, all the micro-pores in the material can be seen from the micro-structure, and the fluidity of particles is very good after directly crushing to the required particle size. Good, at the same time, because of the micro-loose structure of the particles, the instant solubility is excellent; (5) During the drying process, the product has been in a vacuum state, which reduces the oxidation of the product and makes the material difficult to stick. Maintain its original color, fragrance and taste to the greatest extent, and obtain high quality final products.

Vacuum microwave equipment is a new concept of high efficiency, energy saving and environmental protection drying equipment. It has been successfully applied to the drying of Salvia miltiorrhiza extract, Panax notoginseng extract, angelica extract and food malt extract, coffee, milk powder, etc. and achieved good results. For food, because of its short drying time, low temperature, no oxidation in vacuum, and good retention of fragrance; in the pharmaceutical field, for some active substances, API, heat-sensitive substances, vitamins, aromatic substances have a good retention of activity and fragrance.

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