Polyelectrolytic character of amylose. II.

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Abstract
Viscometric titrations of amylose are described. The curves confirm the earlier results of Rao and Foster. A more quantitative consideration is given concerning the changes of the electrostatic charge of the amylose molecules in the pH range of 11–12, where a minimum in the titration curve is found. A viscometric titration performed in solutions containing urea shows a considerably higher viscosity, especially at lower pH's; the curve, however, still shows a minimum between pH 11 and 12. Experiments on the dependence of [η] on the ionic strength at pH 12.7 also demonstrate the typical polyelectrolytic nature of amylose.