E L E C T R O K I N E T I C P H E N O M E N a Vi. I~elationsiiip between Electric Mobility, Charge, and Titration O~" Proteins*

Solutions of the proteins represent in one sense simple systems, rather than complex ones. The properties of proteins in solutions which depend more or less upon changes in electric charge can be investigated directly through the study of the electric mobility of the protein ions 1 and indirectly by means of titration curves with acids, optical rotation, viscosity, etc. If one makes certain assumptions, clarifying and satisfactory relationships can be obtained, linking the electric mobility, the charge, the titration curves, and the optical rotation of proteins.' The theory and data to be presented permit the statement of the problem more explicitly than heretofore in terms of mobilities, and therefore simplify the approach to many of its real complexities. Working with gelatin and crude egg albumin it was previously shown that (1) :