Enhanced Supercooling of Water with a 6 mT/50 Hz Oscillating Magnetic Field and its Application in Fruit Preservation

Abstract

This study aims to investigate the in uence of oscillating magnetic elds on the deep supercooling of water and the supercooling storage of fruits. The results showed that by utilizing a 6 mT/50 Hz oscillating magnetic eld, water (1 ml) was able to be maintained at -18°C for 24 hours, achieving deep supercooling. Combining magnetic eld with oil-sealed water enhanced supercooling compared to oil sealing alone. By adding an oscillating magnetic eld, fruits were maintained at a temperature of -5°C for 12 hours. The supercooled samples exhibited a texture and color that were close to those of fresh samples and also experienced a reduction in water loss of up to 30.25% in comparison to frozen samples that were not treated by magnetic eld treatment. The proposed method achieved signi cant supercooling and improved food quality using an easily obtainable type of magnetic eld.