Abstract
[beta]1-Lactoglobulin was examined for heterogeneity by the variable-solvent and constant-solvent solubility tests. Both tests indicate that [beta]1-lactoglobulin contains 2 proteins, the minor accounting for about 10% of the total. The theoretical basis of solubility tests and their application to salt fractionation are discussed. Fractionation of [beta]1-actoglobulin produced the major components in a more nearly pure state. The behavior of the major component on U-tube electrophoresis is discussed.
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