Is microwave drying equipment suitable for drying Chinese Herbal Pieces

Henan Microwave Equipment Network News: In the microwave electric field, water molecules produce a lot of heat through intense motion friction, which makes water evaporate rapidly and achieve the purpose of drying. Microwave drying is fast, uniform, low drying temperature and short drying time (only a few hours). It does not affect the appearance, color and structure of medicinal materials, and has bactericidal and insecticidal effects. It has a good operating environment. With the continuous development of science and technology, the price of high-power microwave tubes, large waveguides, resonators and other core components will drop dramatically. The technology of microwave equipment is becoming more and more mature. Relatively speaking, the production cost of various microwave equipment will also decrease correspondingly. The application prospect of microwave drying equipment is bright. It can be said that microwave drying equipment is very suitable for the drying of all kinds of Chinese medicinal herbs. After microwave drying, the number of bacteria in the dried pieces decreased by 99%. The gas chromatogram of volatile oil did not change much. Only the volatile oil at low boiling point decreased significantly, while the alkaloids, lactones and organic acids were relatively stable. This is an ideal drying method, but because of the relatively high price, it is not widely used in the market.

For Chinese herbal pieces, no matter drying in any way, the pretreatment should pay attention to less bubbles and more moist, so that the moisture content of the herbs before drying is as low as possible, which can not only shorten the drying time, but also improve the quality after drying. Some medicinal materials such as Gastrodia elata, Platycodon grandiflorum, Salvia miltiorrhiza, Salvia miltiorrhiza, Yuzhu and so on, such as excessive water content, are easy to deepen or even blacken the color of the slices after drying, and are easy to stick slices, seriously affecting the drying and quality of the dried slices. Following is the routine experiment of microwave drying equipment for Chinese herbal pieces:

1, dried ginger, angelica and other 11 kinds of medicinal materials

for 1-3 hours, microwave drying equipment temperature 55-60 degrees C (adjustable temperature). After drying, the moisture, impurities, ash, fungi colonies of Chinese herbal pieces are better than those of traditional drying technology (air drying, sun drying, baking);

2, mint, schizonepeta, mustard, after drying. Curcuma and other medicinal materials

were dried for 1-3 hours, microwave drying equipment temperature was 55-60 degrees C (adjustable temperature). After drying, the content of volatile oil in Chinese herbal pieces was equal to or greater than that in air drying (24-72 hours), and the moisture content was also lower than that in the latter.

Notes: The choice of drying temperature and time has a great impact on the quality of medicinal materials. For example, Catalpol content in fresh Rehmannia glutinosa is lower than that in shade drying, higher drying temperature and longer drying time, Catalpol content is gradually reduced

Henan Microwave Equipment Network reminds us that domestic microwave equipment has a certain proportion in the market at present, so don't blindly select because of the high efficiency and energy saving of microwave equipment. When choosing microwave drying, we must refer to our own actual situation and communicate with sellers.

1, can materials need to be dried by microwave drying

2, how many products need to be dried per hour, whether microwave can meet

3, economic capacity, whether it is able to purchase microwave equipment

4, cost calculation, in production, whether microwave equipment will increase its own production costs. For some industries, microwave is the best choice, such as medicine and traditional Chinese medicine talents, microwave with sterilization, low temperature can also be dried. If high temperature drying sterilization is chosen, it will destroy the drug properties, and microwave in powder and refractory industry is the best choice.