Polyelectrolytes pectic acid

Racape, E., Thibault, J.F., Reitsma, J.C.E. and Pilnik, W. 1989. Properties of amidated pectins II. Polyelectrolyte behaviour and calcium binding of amidated pectins and amidated pectic acids, Biopolymers, 28 f435-f448. 

We intend to present first a set of experimental data concerning the equilibrium properties (pK, activity of counterions) of polyelectrolytes in salt free solutions in a second part, these results are compared with theoretical values obtained when a rod-like model is adopted in the Lifson-Katchalsky, Manning and Oosawa treatments. The polyelectrolytes tested are respectively polysaccharides (alginic and pectic acids), carboxymethylated derivatives of cellulose (CMC), dextran (CMD), amylose (CMA), and sulphonic derivatives of polyvinyl alcohol. The essential difference between them is local rigidity. It is possible to vary by synthesis the degree of substitution and consequently the linear charge density our data are given for dilute aqueous solutions (2 X 10 N-5 X 10" N) at 25°C. 

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