Based on recent improvements in the field, biexponential data from fresh rat liver and monoexponential data from cold storage experiments allow quantification of three distinct relaxation components in liver tissue: bound water (4.2%, R1 = 12.0 +/- 1.7 s-1, R2 = 440 +/- 180 s-1); structured water (59%, R1 approximately 3.3 +/- 0.07 s-1, R2 approximately 24.9 +/- 1.1 s-1); and free water (approximately 37%, R1 = R2 approximately 0.4 s-1). However, only the relaxation rates of the structured water component change with water content: R1A (s-1) = 6.53* Ms/Mw - 0.77 (r2 = 0.911); R2A (s-1) = 71.15 * Ms/Mw - 3.09 (r2 = 0.956), respectively. This suggests a slow exchange between bound and structured water in liver cells.
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