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Introduction:
Ultrasound is an elastic mechanical vibration wave, which is
fundamentally different from electromagnetic waves. Because
electromagnetic waves propagate in a vacuum, and ultrasonic waves
must propagate in the medium, the entire process of expansion and
compression occurs when passing through the medium.
In liquids, a negative pressure is created during the expansion
process. If the ultrasonic energy is strong enough, the expansion
process can create bubbles in the liquid or tear the liquid into
small cavities. These cavities are closed instantaneously, and an
instantaneous pressure of up to 3000 MPa is generated when the
cavity is closed, which is called cavitation. The entire process is
completed in 400 μs.
Cavitation refines substances and makes emulsions, accelerates
target ingredients into solvents, and improves extraction rates. In
addition to cavitation, many secondary effects of ultrasound are
also conducive to the transfer and extraction of target components.
The significance of cavitation is the reaction that occurs when a
bubble bursts. At some points, the bubbles no longer absorb the
ultrasonic energy, and implosion occurs. Gases and vapors in
bubbles or cavities are rapidly adiabaticly compressed, resulting
in extremely high temperatures and pressures.
The volume of the bubble is extremely small compared to the total
volume of the liquid, so the heat generated is instantly
dissipated, and it will not have a significant impact on
environmental conditions. The cooling rate after the collapse of
the cavity is estimated to be about 1010 ° C / s.
Ultrasonic holes provide a unique interaction between energy and
matter. The resulting high temperature and pressure can lead to the
formation of free radicals and other components.
In a pure liquid, when a hole is broken, it always remains
spherical due to the same surrounding conditions; however, close to
the solid boundary, the breakage of the hole is non-uniform.
Kinetic energy, which moves in the bubble and penetrates the bubble
wall.
The impact force of the jet on the solid surface is very strong,
which can cause great damage to the impact area, resulting in a
highly active fresh surface. The impact force produced by the burst
bubble deformation on the surface is several times greater than the
impact force generated by the bubble resonance.
The above-mentioned effect of ultrasonic waves is very effective in
extracting various target components from different types of
samples.
The high temperature and pressure generated on the contact surface
between the organic solvent and the solid substrate by applying
ultrasonic waves, plus the oxidizing energy of the free radicals
generated by ultrasonic decomposition, etc., thereby providing high
extraction energy.
Application:
(1) Compared with conventional extraction methods, ultrasonic
extraction technology has high extraction efficiency and short
extraction time;
(2) Ultrasonic extraction is not easily limited by the use of
solvents, allowing the addition of co-extractants to further
increase the polarity of the liquid phase and improve the
extraction efficiency;
(3) Compared with supercritical CO2 extraction and ultrahigh
pressure extraction, the ultrasonic extraction equipment is simple
and the extraction cost is low;
(4) In most cases, the ultrasonic extraction operation has few
steps, the extraction process is simple, it is not easy to cause
pollution to the extract, and the extraction temperature is low,
which is suitable for the extraction of heat-sensitive target
components.
Advantage
Compared with conventional extraction technology, ultrasonic
extraction is faster, cheaper and more efficient.
Compared with the boiling and alcohol precipitation processes,
ultrasonic extraction has the following outstanding features:
(1) No need for high temperature
(2) Atmospheric pressure extraction, good safety, easy operation,
convenient maintenance
(3) High extraction efficiency
(4) Broad spectrum. Wide applicability, all kinds of Chinese herbal
medicine ingredients can be ultrasonically extracted
(5) Ultrasonic extraction has a small relationship with the
properties of the solvent and the target extract
(6) Reduce energy consumption
(7) The amount of raw materials for medicinal materials is large,
multiplied or increased several times, and there are few
impurities, and the effective ingredients are easy to separate and
purify
(8) Low extraction process cost and significant comprehensive
economic benefits