Low field magnetic resonance imaging and analysis technology can be used to study the changes in moisture distribution and composition during pork storage. CPMG sequences are used to collect reduction curves and invert them to obtain T2 distribution maps, where T21, T22, and T23 correspond to bound water, non flowing water, and free water, respectively. The percentages of the three types of moisture can be calculated by peak area calculation.

6. Analysis of spatial distribution of water/oil;

Low field nuclear magnetic resonance analyzer (moisture distribution during pork storage)
The oxidation and degradation of myofibrillar proteins alter the protein structure, resulting in changes in hydrophobic and hydrophilic residues on the protein surface. This leads to an increase in the hydrophobicity of the protein surface, causing a decrease in T22, which is less likely to flow in the muscle, and an increase in T23, which is less likely to flow. The non flowing water state changes to free water, becoming a new source of juice loss.

Low field nuclear magnetic resonance analyzer (moisture distribution during pork storage)
Nuclear magnetic resonance proton density weighted imaging can convert the signal generated by H protons inside the meat sample into an H density map without damaging the meat sample, reflecting the spatial distribution of moisture in the meat sample. The higher the brightness value, the higher the H proton density, the stronger the signal, and the higher the moisture content in the area.