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In vitro NMR proton measurements in peritoneal ascites

The proton spin - lattice relaxation rate in malignant and non-malignant ascites was measured with an FT NMR spectrometer operating at 60 MHz. The mean relaxation rate in non-malignant ascites was significantly smaller than that of malignant ascites. However, the of malignant ascites overlaps with that of non-malignant ascites over all concentrations of total protein (TP) in samples. The in non-malignant ascites correlates strongly with TP, whilst the in malignant ascites shows only a moderate correlation. measurements before and after addition of ascorbic acid (reductant) suggest that there is a small paramagnetic contribution of ions to the in malignant ascites. The least-squares fitting of versus TP for non-malignant data gives a linear relationship, and suggests that the mechanism in non-malignant ascites is caused by a fast chemical exchange of water molecules between protein-bound water and free water.