Ion binding or condensation to polyelectrolytes? A detailed comparison, on the example of sodium heparinate.
A modified Poisson-Boltzmann treatment is applied to aqueous solutions of sodium heparinate, in the presence of added salts (NaCl, LiCl, KCl, CaCl2). The results show that 23Na-NMR line widths for the counterions are determined nearly exclusively by Na+ in the immediate vicinity of the linear polyelectrolyte. Hence, two-state treatments, despite their crude character, can reproduce such experimental data rather well.
Delville
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Institut de Chimie Organique et de Biochimie, Université de Liège, Sart-Tilman par 4000 Liège, Belgium.
Laszlo
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