Electrical excitability of artificial enzyme membranes. I. Ion-exchange properties of synthetic proteinic films.

This paper deals with the physico-chemical properties of artificial membranes. The membranes are produced with different protein molecules which offer amphoteric sites with weakly ionizable groups. The adsorption of phosphate and sodium ions in different artificial proteinic membranes is studied as a function of both pH and concentration of the external solution. The influence of the sign and density of fixed charges as the nature and concentration of mobile ions is studied by measuring the potential difference between both membrane compartments.