Acoustic cavitation is a series of dynamic processes in which bubbles in a liquid act under the action of a sound field. When the ultrasonic wave of sufficient intensity passes through the liquid, when the sound pressure value of the negative half cycle of the sound wave exceeds the static pressure inside the liquid, the presence of tiny bubbles (called a cavity or cavitation nucleus) in the liquid increases rapidly. In successive positive pressure phases of the sound waves, the bubbles are suddenly adiabatically compressed. When compressed, the size of the bubble becomes smaller, and the enormous pressure it creates is highly likely to cause the cavity to completely disappear, making it possible to completely close them. Because the instant cavity before closing and the tiny space around it present hot spots, resulting in high temperature and high pressure zone (pressure can reach several thousand atmospheres, temperature exceeds 50,000 degrees Celsius), accompanied by powerful shock wave and speed of 400 kilometers The jet. Therefore, at the moment when the cavity is completely closed, due to the extreme physical environment, only the chemical constituents of the Chinese herbal medicine rupture in the collapse of the cavitation bubbles instantaneously generated in the solvent, so that the solvent penetrates into the cells and the chemistry in the cells The ingredients are dissolved in the solvent.
The vibration effect of the ultrasonic extraction device enhances the release, diffusion and dissolution of intracellular substances. Moreover, the ultrasonic crushing process is a physical process, and there is no chemical reaction in the soaking extraction process, and the structure and properties of the soaked chemical components do not change, so the ultrasonic vibration effect enhances the cell breaking speed, shortens the crushing time, and promotes The chemical component is dissolved in the solvent. Therefore, the use of ultrasonic extraction equipment chemical composition can greatly reduce the extraction time and strengthen the extraction rate. The structure and properties of the chemical composition do not change the effect of the ultrasonic extraction device. The effect depends not only on the strength and frequency of the ultrasonic wave, but also on the structure of the fractured object. The calculations show that cavitation occurs when the intensity of the ultrasonic radiation surface reaches 300 W/m2, and the broken organism and cells are completely broken.
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