Ultrasonic extraction is widely used to release valuable intracellular substances from plant materials. Target extracts include lipids / fatty acids, proteins, vitamins, polyphenols and other bioactive compounds. As a process enhancement technology, ultrasonic extraction of edible oil, such as extra virgin olive oil, avocado oil, sunflower seed oil, flaxseed oil, can improve the yield of extracted oil (fatty acid), shorten the extraction time and reduce or avoid the use of solvent consumption.
As a non thermal extraction technology, ultrasonic assisted extraction is based on acoustic cavitation. Acoustics, also known as ultrasonic cavitation, can produce strong shear force, which can destroy the cell wall and increase the mass transfer between the cell interior and the surrounding solvent. Because ultrasonic assisted extraction is a non heat treatment method, it can prevent the thermal degradation of heat sensitive nutrients. Ultrasonic extraction of edible oil at low temperature can avoid the thermal induced decomposition of the extracted oil and reduce the loss of bioactive compounds to the greatest extent. Ultrasonic extraction of high quality edible oil has higher yield and less processing time.
Extraction of olive oil
Ultrasonic machine can be integrated into conventional olive oil production line. Ultrasonic treatment of olive paste can improve the performance of the extraction process, so as to improve the extraction capacity of olive oil factory. Ultrasonic treatment is the basic step in the process of mechanical olive oil extraction, which can greatly improve the situation. Gelatinization efficiency depends on the rheological properties of olive paste and gelatinization parameters such as time and temperature. These factors seriously affect the yield and quality of virgin olive oil.
When the strong ultrasonic wave is applied to the olive sauce, cavitation will occur. Cavitation refers to the formation, growth and rupture of bubbles in alternating pressure cycles. Ultrasonic cavitation destroys cell structure, releases soluble compounds from olive tissue and improves mass transfer. Therefore, the extraction rate and yield were significantly improved by ultrasonic treatment. The oil in the ultrasonic treated olive paste also showed lower bitterness and higher contents of tocopherol, chlorophyll and carotenoid.
Ultrasonic treatment is a mild non thermal food processing technology, which can release oil and active compounds (such as antioxidants, phenols, vitamins) from olive paste. The olive color paste can be treated uniformly through the continuous on-line process of ultrasonic cavitation zone. Ultrasonic treatment is also very beneficial to the process temperature: ultrasonic treatment can instantly heat and greatly reduce the preheating time of olive sauce, after which the process temperature can be easily maintained at the optimal process temperature (e.g. 28-30c).
Extraction of avocado oil
The recovery rate of avocado oil can be increased by 15-24% by using ultrasonic extractor to treat avocado mud. Ultrasonic treatment can help avocado oil cold pressing by increasing oil production. The avocado oil retained its valuable nutrients, full flavor aromatics and strong emerald green by non hot pressing technology. The ultrasonic extraction of avocado pulp improves the oil release and potentially shortens the instant time in the production of industrial avocado oil without affecting the quality.
Ultrasonic pressed avocado oil is carefully maintained to maintain all its healthy nutrients, such as vitamins, enzymes, micronutrients and flavor components. The results show that ultrasonic treatment can improve the extraction rate of edible oil and reduce the extraction time, while maintaining the high nutritional level of vegetable oil.
summary
Ultrasonic extraction can use a single method to extract edible oil from seeds and oil-rich fruits, or it can be integrated or modified into conventional existing edible oil production equipment to improve the yield and quality of oil. Ultrasonic extraction equipment is easy to install, only needs a small space (small footprint), so it can be modified to the existing oil plant. The industrial ultrasonic extractor has the characteristics of durability and industrial grade, which can operate all day under heavy load and harsh environment.