Microwave technology in medicine Extraction
A microwave extraction principle:
Microwave extraction is the use of microwave energy to increase the extraction rate of a newly developed new technologies. It works in academia many different descriptions, the basic theory and penetration of microwave heating based on the principle, that the microwave heating of the material is solid, while the conventional methods are mostly of planar heating. Microwave field, the ability of various materials absorb microwave makes the difference matrix material extraction system in certain areas or certain components are selectively heated, so that the energy difference internally generated material was extracted substances get enough power from the matrix or system separation. Microwave extraction with simple equipment for a wide range of high extraction efficiency, good reproducibility, save time, save solvent, pollution, the whole production line cost and low operating costs.
Most currently used in microwave extraction water extraction, alcohol extraction projects. Microwave extraction process composed of complete production line process: crushing, pretreatment, microwave extraction, solid-liquid separation, concentration system of five aspects. Pieces of raw materials processed into pulverizer, granules or powder, add solvent to the mixing microwave pretreatment or soaking extraction equipment, microwave equipment usually in a very short period of time once an effective natural plant extraction, microwave extraction after liquid separation, the solution was concentrated delivery system processing. For plants volatile active ingredients, you can set the microwave extraction equipment interfacing conventional condensing unit for collection. Two, microwave extraction advantages:
1, the traditional heat extraction is heat conduction, heat radiation, etc. carried out from outside to inside, and inside and outside of microwave-assisted extraction is simultaneously heated. No high temperature heat source, eliminating thermal gradients, thus greatly enhance the quality extract, effectively protecting the food, pharmaceuticals and other chemical material in the functional ingredients.
2, the microwave heating can be transmissive, extraction time saving. Based on extensive field data shows that the conventional multi-extraction tank 8 hours to complete the work, with the same size of the microwave dynamic extraction equipment only tens of minutes to complete, save 90% of the time.
3, microwave extraction can have extraordinary ability, the same material using conventional methods take two or three times to mention the net, in the microwave field at once put under the net. Greatly simplifying processes.
4, microwave extraction no thermal inertia easy to control, all parameters can be digitized, and pharmaceutical modern standards.
5, microwave extract high purity can be water extraction, alcohol, oils mention. Widely applicable.
6, the extraction temperature is low, not gelatinized easily separated, the latter is easy to handle. Save energy.
7, less solvent consumption (conventional method may be less than 50% to 90%).
8, the microwave equipment is electrical equipment, without equipped with boilers, pollution, safety, belonging green engineering.
9, the production line composed of simple, saving investment.
Have been developed out of the microwave extraction device is fully adapted to the various types of large, medium and small enterprises of food and pharmaceutical engineering.
Third, the two kinds of production type microwave extraction equipment:
Chinese medicine extraction of active ingredients, for microwave equipment is concerned, extraction effect mainly depends the following factors: microwave field strength density, solvent and the material put ratio, extraction temperature, reaction time, temperature rise rate, material crushing degree. To get a higher extraction rate, different medicine, extraction process are different, you can use the microwave extraction experiments in the laboratory equipment and explore the process, and then enlarge the design engineering and manufacturing. Microwave applications engineering system uses microwave frequencies of 915MHz and 2450MHz, the current domestic herbal extracts used in microwave microwave frequency mostly 2450MHz, its wavelength is 12 cm, the heating of water penetration depth between 2 to 3 centimeters, according to the microwave Engineering characteristics There are two types of microwave extraction equipment: Pipe microwave extraction equipment: the microwave source, microwave cavity, pipelines and two storage tank components. A powdered material storage tank to the mixing materials and the solvent pumped into the microwave engineering material of the pipeline, the microwave is transparent to microwave engineering materials, the materials and the solvent flowing through the microwave cavity directly heated by microwaves, extraction so that the active ingredient transferred to the extraction is complete, another storage tank. Pipeline in the form of a single tube, array type, spiral-shaped. Foreign microwave extraction equipment spiral approach is more common. Because microwave limited penetration depth, 2450MHz frequency microwave system using pipe diameters were between 3 to 6 cm.
Microwave extraction equipment of this type of simple structure, low cost, short extraction time, to adapt continuous operation, controllable. The downside is only applicable to powdered materials extraction, microwave extraction equipment, large pipe is too long, prone to clogging, energy conversion efficiency in general, the variability of the pressure difference, not suited to a variety of process parameter adjustment. Tank microwave extraction equipment: With conventional dynamic extraction tank structure is similar, except that the steam jacket heating to microwave heating chamber, the three-dimensional planar heating to heating, heat from the steam jacket wall to heat liquid itself. Tank microwave extraction equipment can be applied on the blocks, flakes, granules, powder materials extraction, can heat, temperature, atmospheric pressure, positive pressure, negative pressure extraction, which can meet different requirements of process parameters herbal extracts, widely applicable, microwave power installed capacity from a few hundred watts to hundreds of kilowatts, the tank volume from tens of milliliters to several cubic meters. Field practice proved a 1 cubic capacity microwave extraction equipment 5 to 8 cubic fairly conventional dynamic extraction tank capacity. Disadvantage is that the microwave microwave extraction production line installed power greater difficulty of making high extraction production line can only work in batches, feeding, into the liquid, the liquid slag and other auxiliary longer, reducing the overall utilization. It should be noted that the limited penetration depth of microwave, microwave extraction device must be equipped with a stirrer, dynamic extraction. Tank microwave extraction equipment is widely used, universities, research units, laboratories have adopted this method almost.
Fourth, safe, reliable, good prospects:
Last year, the network launched a world energy leakage of microwave devices discussion harmful to human health, the promotion of microwave extraction technology, microwave
Microwave extraction equipment leaks will inevitably become a focus of everyone absorbed. Currently specialized industrial microwave equipment manufacturer factory equipment leak standard control in 1mw/cm2 the following, the energy level with the phone transmitting power fairly, regardless of pipeline or tank microwave extraction equipment, closed strong, its microwave leakage can be controlled in several ten microwatts or less, is the national job market for microwave radiation safety and health standards one percent, will not cause environmental electromagnetic pollution, will not endanger the health of the operator.
Microwave extraction technology is also part of initiation stage, the laboratory has received a large number of results, confirming the excellent medicine microwave extraction technology practical value, many research institutions have embarked on a microwave extract pharmacological research, clinical research, and from unilateral Extraction extended to Compound Extraction. In the next few years our microwave extraction technology and countercurrent extraction techniques, ultrasonic extraction technology, combined with low-temperature vacuum extraction technology will be introducing many new generation of Chinese medicine extraction equipment.
Microwave extraction technology is a much-needed high-tech into productivity, is worth promoting modernization of Chinese pharmaceutical items. Because microwave extraction equipment industrialized production technology into the key years before fully resolved, now remains to be the majority of the pharmaceutical industry awareness and adoption. Hope academic and technology insight to give attention, care and support. Sincerely hope to cooperate with all walks of life to promote microwave extraction technology, and the high-tech rapidly transformed into productivity for the country contribute to the modernization of Chinese medicine pharmacy.

 

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