As an efficient and green physical treatment method, ultrasonic homogenization technology has shown significant advantages in the field of extraction in recent years. This article systematically introduces the working principle of ultrasonic homogenization, analyzes in detail its specific application in the extraction of plant active ingredients, food nutrients and medicinal ingredients, discusses the superiority of this technology compared with traditional methods, and looks forward to its future development trend.
2. Working principle of ultrasonic homogenization technology
2.1 Cavitation effect mechanism
The core function of ultrasonic homogenization comes from the cavitation effect - when high-intensity ultrasonic waves (usually 20kHz-1MHz) propagate in a liquid medium, alternating positive and negative pressure waves are generated. In the negative pressure half-cycle, the liquid is subjected to tensile stress to form microbubbles; in the subsequent positive pressure half-cycle, these bubbles collapse rapidly, instantly generating local high temperatures of up to 5000K and high pressures of 50MPa. This extreme condition can effectively destroy the cell wall structure and increase solvent permeability.
2.2 Secondary Effects Synergistic Effect
In addition to the cavitation effect, ultrasound also produces a variety of synergistic effects:
Microjet impact: asymmetric bubble rupture produces microjets with a speed exceeding 100m/s
Shear force effect: high-frequency vibration produces strong mechanical shear force (up to 10⁴s⁻¹)
Thermal effect: energy conversion causes a moderate increase in system temperature (usually controlled at 50-60℃)
Free radical effect: ·OH and ·H active free radicals are generated in the water medium
3. Main application areas
3.1 Extraction of plant active ingredients
In the extraction of flavonoids, ultrasonic assistance can increase the extraction rate by 30-50%, and shorten the processing time from several hours to 15-30 minutes. For example, in the extraction of ginkgo leaves, compared with the traditional ethanol reflux method, ultrasonic treatment (40kHz, 300W) increased the quercetin yield from 2.1% to 3.4%.
The extraction of polyphenols also benefited significantly. The hydroxytyrosol yield of olive leaves after ultrasonic extraction (25kHz, 80% amplitude) for 20 minutes was 22% higher than that of static extraction for 24 hours, and the antioxidant activity was more intact.
3.2 Application in the food industry
In the field of oil extraction, ultrasonic pretreatment can increase the extraction rate of soybean oil by 12-18%, while reducing the amount of solvent by about 30%. It is particularly noteworthy that the microcavitation generated by ultrasound can effectively destroy the membrane structure of oil body cells, but will not cause significant isomerization of fatty acids.
In terms of protein extraction, pulsed ultrasonic treatment (20kHz, pulse interval 1:1) can increase the soybean protein extraction rate from 68% to 85%, and the protein dispersion index (PDI) can be increased by 15 percentage points.
3.3 Extraction of medicinal ingredients
For the extraction of alkaloids such as vinblastine, ultrasound-assisted extraction shortens the extraction time from 8 hours to 45 minutes, and increases the yield by 40%. Studies on key process parameters show that ultrasound (40kHz) has the best effect under the conditions of 70% ethanol concentration, 1:15 material-liquid ratio, and 50°C temperature.
In the extraction of terpenoid compounds, the local high temperature and high pressure generated by ultrasound are particularly suitable for the retention of volatile components. Ultrasonic extraction of peppermint oil not only shortens the time by 80%, but also increases the menthol content by 8-12% compared with steam distillation.
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How does ultrasonic technology revolutionize modern extraction processes?
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