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Application of High Power Ultrasound and Microwave in Food Processing: Extraction

High power ultrasound has opportunity to be used as tool for extraction. The first Soxhlet extraction assisted by ultrasound, named Ultrasound-Assisted Soxhlet (UASE) was developed in 2004 by Luque de Castro et al. Another innovative method for ultrasound assisted extraction was developed by Chemat et al. System for oil extraction, named Sono- Soxhlet system was developed by inserting an ultrasonic probe directly into the extraction chamber, i.e. ultrasound is applied directly in the extraction reactor. The lipid extracts obtained from the Sono-Soxhlet process are qualitatively the same as conventional process, and time for extraction is significantly reduced, requiring 30 minutes vs. conventional 8h. On the other hand, there is also promising technique of using microwaves for food processing. Microwaves are largely used in food industries for drying, pasteurization, sterilization, thawing, tempering, baking and so on. Microwaves are electromagnetic waves whose frequency varies within 300 MHz to 300 GHz. Domestic microwave appliances operate generally at a frequency of 2.45 GHz, while industrial microwave systems operate at frequencies of 915 MHz and 2.45 GHz.

High Power Ultrasound; Microwave; Extraction

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