Microwave extraction of food and Chinese herbal medicine

2018-09-12 12:03:19

The microwave extraction (extraction) mechanism is that microwave radiation high-frequency electromagnetic waves penetrate the extraction medium to reach the internal vascular bundle and the glandular system of the material. Due to the absorption of microwave energy, the internal temperature of the cells rises rapidly, causing the internal pressure of the cells to exceed the capacity of the cell wall to expand and the cells to rupture. The intracellular active ingredient is free to flow out, and the extraction medium captures and dissolves at a lower temperature. By further filtering and separating, the extracted material is obtained. Microwave energy is an energy form that can act on many substances composed of polar molecules during transmission, and the microwave electromagnetic field causes the molecules of the substance to be instantaneously polarized. When we use microwave energy with a frequency of 2450MHz for extraction, the molecules of the solute or solvent do the polarity change movement at a rate of 2.45 billion times per second, thereby generating mutual friction and collision between molecules, and promoting the active part of the molecule. Sexual part) better contact and reaction, while rapidly generating a large amount of heat, causing the cell to rupture, allowing the cell fluid to overflow and diffuse into the solvent. The solvent is used to extract the active ingredients of Chinese herbal medicine, such as dipping method, percolation method, reflux extraction method and continuous reflux extraction method. In principle, microwave can be added for auxiliary extraction, making it an effective extraction device for efficient Chinese herbal medicine.

1. Traditional heat extraction is carried out from the outside to the inside by means of heat conduction, heat radiation, etc., while microwave-assisted extraction is simultaneous heating inside and outside. There is no high-temperature heat source, eliminating the thermal gradient, which greatly improves the extraction quality and effectively protects the functional components in food, medicine and other chemical materials;

2. Since the microwave can be heated by penetration, the extraction time is greatly saved. According to a large number of on-site statistics, the routine multi-function extraction tank can be completed in 8 hours, and it can be completed in a few tens of minutes with the same size microwave dynamic extraction equipment.

3, microwave energy has extraordinary extraction ability, the same raw materials need to be cleaned two or three times by conventional methods, and can be cleaned once in the microwave field. Greatly streamline the process.

5, microwave extraction has no thermal inertia, easy to control, all parameters can be digitized, and pharmaceutical modernization.

6. The microwave extract has high purity and can be extracted by water, extracted by alcohol and extracted by fat. Widely applicable.

7. The extraction temperature is low, it is not easy to gelatinize, the separation is easy, and the post-treatment is convenient. save energy.

8, the amount of solvent is small (can be 50% ~ 90% less than the conventional method);

9. Microwave equipment is electrical equipment, no need to be equipped with boilers, no pollution, safety, and belongs to green engineering;

10. The production line is simple in composition and saves investment; the microwave extraction equipment that has been developed at present is fully adapted to the food and pharmaceutical engineering of various large, medium and small enterprises in China.

Although the application research of microwave radiation technology in the food industry, pharmaceutical industry and chemical industry started in just a few years, the existing research results and application results are enough to show its superiority: the fragrance has been completed in the laboratory. Research on microwave extraction process of condiments, natural pigments, Chinese herbal medicines, cosmetics, health foods, beverage preparations and other products. At present, microwave extraction has been used in a number of Chinese herbal medicine invasive production lines, such as puerarin, tea, ginkgo, and licorice. Microwave-assisted extraction has been listed as one of the 21st century food processing and traditional Chinese medicine pharmaceutical modernization technology. The research institute treated hundreds of natural plants with microwave extraction. Whether it is extraction speed, extraction efficiency or extraction quality, it is much better than conventional processes.

Performance description: Although the application research of microwave radiation technology in the food industry, pharmaceutical industry and chemical industry has only started in just a few years, the existing research results and application results are enough to show its superiority: already in the laboratory Complete research on microwave extraction of spices, seasonings, natural pigments, Chinese herbal medicines, cosmetics, health foods, beverage preparations and other products. At present, microwave extraction has been used in a number of Chinese herbal medicine invasive production lines, such as puerarin, tea, ginkgo, and licorice. Microwave-assisted extraction has been listed as one of the 21st century food processing and traditional Chinese medicine pharmaceutical modernization technology. The research institute treated hundreds of natural plants with microwave extraction. Whether it is extraction speed, extraction efficiency or extraction quality, it is much better than conventional processes.

Function and characteristics: Microwave vacuum extraction equipment: According to the principle of different boiling points of liquid under different pressures, the microwave extraction vacuum and vacuum technology can be combined. The microwave extraction can be carried out at room temperature of 20~30 Â°C. The equipment specifications are complete. The liter is up to 3 cubic meters. Small equipment is used for testing by institutions, research institutes and various laboratories, and large equipment is used by production units. The microwave power of the new series of microwave-assisted extraction equipment ranges from 1KW to 120KW, the volume ranges from 5 liters to 5 cubic meters, and the extraction temperature can be arbitrarily set from 30 to 100 Â°C. The extraction solvent can be water, alcohol, or fat. Weakly polar solvents can also be used depending on the materials and processes. Reflow and condensing units can be provided as needed. It has been applied well by many food and pharmaceutical manufacturers.