Abstract
Protein fractions of low molecular weight from urines of patients with tubular proteinuria were separated by gel filtration. Their composition was studied by electrophoresis and immunoelectrophoresis. Normal urine was shown to contain α 2-, β 2- and post-γ proteins considered to be characteristic of tubular proteinuria. The differences in gel filtration patterns between normal and tubular proteinuria were due to the higher concentration of low molecular weight proteins in tubular proteinuria urines, as well as to the higher proportion of amylase isoenzymes in normal proteinuria. In normal serum, several trace components present in cerebrospinal fluid, normal urine and tubular proteinuria, have been identified.
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