Highlights • Multi-frequency ultrasound assisted freezing accelerated the freezing rate.• Increase in the number of ultrasonic frequencies enhanced the cavitation effects.• TUF treated samples retained better quality attributes.• Light microscopy… Click to show full abstract
Highlights • Multi-frequency ultrasound assisted freezing accelerated the freezing rate.• Increase in the number of ultrasonic frequencies enhanced the cavitation effects.• TUF treated samples retained better quality attributes.• Light microscopy observation was adopted to study the microstructures of frozen fish.
               
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