The ultrafiltration of proteins through graded collodion membranes

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Abstract
The influences of the several factors, nature of solvent medium, pH, neutral salts, concn. of protein and filtration pressure, on the ultrafiltration of horse serum-albumin and pseudoglobulin through graded collodion membranes are investigated; 2 types of filtration, normal and abnormal, are demonstrated, and interpreted in terms of adsorption of protein within the membrane pores. Hartley''s broth at pH 7.6-7.8 is found to be the best solvent medium for protein filtration, as previously noted for bactenophages and animal viruses. The filtration end-point of each protein is the same in pure soln. in Hartley''s broth at pH 7.8 as in native horse serum.

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