Case Studies of Nuclear Magnetic Resonance Applications in the Food Sector【三】

Case Study 1: Proton Density-Weighted Imaging and Pseudocolor Maps of Dried Shrimp with Varying Moisture Content

 

Figure 1. T2 Relaxation Profiles and Proton Density-Weighted Images of Shrimp Samples with Varying Moisture Content

Significant differences were observed in weakly bound water (T_21b), immobile water (T₂₂), and free water (T₂₃) across shrimp samples with different moisture levels. As moisture increased, the mobility and content of immobile and free water also increased, resulting in brighter imaging signals.

Case Study 2: Effect of Varying Water Addition on Moisture Distribution During Wheat Conditioning

 

Figure 2-1. T2 Relaxation Profiles of Wheat After 24 Hours of Conditioning with Different Water Additions

Figure 2-2. NMR Imaging of Wheat Conditioned for 24 Hours at Varying Water Addition Levels

Case Study 3: Moisture Distribution During Corn Water Absorption

 

Figure 3. Visualization of Moisture Distribution During Corn Soaking

Case Study 4: Changes in Moisture State of Blueberries During Cold Storage at 4°C

 

Figure 4.1: T2 Relaxation Profiles During Blueberry Storage at 4°C
Figure 4.2: Peak Area Changes During Blueberry Storage at 4°C

Figure 4.3: Proton Density-Weighted Imaging of Blueberries During Storage at 4°C

During cold storage at 4°C, blueberries gradually lost moisture. Minimal change was observed in the first 7 days, but significant water loss was noted after 14 days. The peak area of T₂₃ (A₂₃) and the total signal area decreased steadily, correlating with reduced image brightness and contrast.

Instrument Used: NMR Imaging Analyzer – Model NMI20-015V-I