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The need for improved methods for the determination and characterization of the protein components of human blood plasma requires no emphasis. The commonly employed methods for the separation of plasma proteins on the basis of solubility give little detailed information and generally yield poor separations (1). Likewise, the method of electrophoretic analysis, although of unquestioned value, will fail to differentiate between components of widely differing chemical properties and physiological functions if they happen to have the same mobility in an electric field. The present communication describes the adaptation of Method 10 of plasma fractionation developed by Cohn and his associates (2) for the quantitative estimation of certain of the protein and lipoprotein components in small quantities of normal human plasma. The fractionation is carried out at low temperatures using low concentrations of ethanol and of various salts, resulting in the concentration of each protein component

the journal of clinical investigation/the journal of clinical investigation

CHEMICAL, CLINICAL, AND IMMUNOLOGICAL STUDIES ON THE PRODUCTS OF HUMAN PLASMA FRACTIONATION. XL. QUANTITATIVE SEPARATION AND DETERMINATION OF THE PROTEIN COMPONENTS IN SMALL AMOUNTS OF NORMAL HUMAN PLASMA 1