Abstract
A beet pectin (partial sodium salt) containing approx. 80% uronic acid of which about 40% was esterified was studied dielectrically in aqueous solution at low concentrations (0.022–0.7 g/l). High dielectric increments were obtained. The increments were markedly concentration dependent, increasing sharply with decreasing concentration. At the lowest concentration studied (0.22 g/l) Δϵ/g was 70 units. When the reduced increments were calculated with respect to the concentration of ionized groups present, the increment vs. concentration curve was closely similar to those of alginate and sodium carboxymethylcelluloses. Finally the dielectric dispersion and the influence of excess counter ions was studied. In all respects the dielectric properties of the pectin were closely analogous to those of other polyelectrolytes studied.
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