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Three different blood units were treated separately by the hypotonic dialysis (HD) and the dimethylsulphoxide osmotic pulse (DMSO) method, in order to load the erythrocytes with inositol hexaphosphate. A detailed comparison between the two loading techniques was performed by monitoring the red cell distribution patterns on discontinuous Percoll density gradients, the RBC oxygen affinity and the amount of the main intracellular organic phosphates with the 31P-NMR. The results obtained showed that: (1) The HD loading produces a redistribution of the RBC fractions with a concomitant smoothing of the relative differences among distinct fractions (2) only a minor portion of erythrocytes (from 8.5 to 24.9% of total RBCs) are loaded with IHP after the DMSO treatment. All of these cells move to the lightest fraction (d = 1.080 g/ml). (3) Both HD and DMSO IHP-loaded cells show an increase in P50 (basal vs. after loading, means +/- SD: 25.8 +/- 3.0 vs. 52.5 +/- 3.2 mm Hg) correlated to the IHP incorporation (mean intracellular IHP concentration: 4.2 mmol/l RBC). (4) probably the IHP incorporation efficiency could be probably improved at least by increasing the IHP concentration during the treatment.
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