The dependence of sodium ion binding to poly(galacturonic acid) on degree of neutralization has been determined by 23Na n.m.r, and calculated using the Poisson-Boltzmann theory for the system without excess salt over the polyion concentration range 5-50 mM (monomer basis). The relative fraction of bound sodium ions depends on the polyion concentration and the degree of neutralization. The agreement between the experimental and calculated fraction bound is excellent for the lowest concentration at degree of neutralization greater than about 0.2 and for even the highest concentration at degree of neutralization greater than about 0.6
Посилання на статтю:
23Na n.m.r, studies of partially neutralized poly (galacturonic acid) / Supriya Ghagare, George B. Savitsky and H. Garth Spencer // Polymer. – 1992. – Vol 33. – P. 4725-4727.