Preparation and Properties of Improved Protamine Collodion Matrix Membranes of Extreme Ionic Selectivity

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Abstract
Improved protamine collodion matrix membranes of extreme electrochemical activity were prepared by the adsorption of purified protamine from aqueous solutions on preformed highly porous collodion membranes whose porosity was subsequently reduced by drying. The most useful permselective membranes give rise to concentration potentials which agree with the calculated thermodynamic maximum potential in potassium chloride cells up to 0.1N/0.05N within the meaningfulness of the method. At higher concentrations the measured potentials become gradually less than the theoretical value. The more highly selective membranes have anion permeabilities which in are 250 to 450 times greater than the cation permeabilities and 2,000 to 12,000 times greater in 0.01N solutions. With solutions of these ratios were at least two orders of magnitude greater. The ohmic resistances of the permselective membranes of highest selectivity (as measured in ) may be adjusted from about 10 ohm‐cm2 upward.

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