Effect of magnetic field‐assisted freezing on water migration, fractal dimension, texture, and other quality changes in tilapia

To study the effect of magnetic field‐assisted freezing on tilapia quality changes, this experiment used the application of a magnetic field as an auxiliary condition to freeze tilapia, and the static magnetic field strength was 0 G, 5 G, 10 G, 15 G, 20 G, 30 G. The results show that magnetic field‐assisted freezing has a positive effect on the freezing rate, water migration, microstructure, and other aspects. Among the strengths applied, the effect of 15 G is the most significant, and the effect of 20 G and 30 G is lower than that of 15 G. Compared with the control group, the magnetic field intensity of the other groups showed no significant difference in the effect of each index. Under the experimental conditions, the magnetic field has a significant promotion effect on the sample quality, but the effect does not increase linearly with the increase of the magnetic field intensity. Novelty impact statement The use of magnetic field for auxiliary freezing provides a new theoretical method for the freezing quality of tilapia. Using fractal dimension to quantitatively analyze the quality of frozen tilapia and verify the applicability of magnetic field in frozen tilapia.