Electrophoresis and silver staining of rat urinary proteins including alpha 2u-globulin (rat n II).

Sodium dodecyl sulfate-polyacrylamide gel electrophoresis and silver staining have been used to monitor the fractionation of rat urinary proteins by Amicon Centriprep C30/C10 ultrafiltration and to assess the purification of alpha 2u-globulin, a laboratory animal allergen, precipitated by exhaustive dialysis. Factors influencing the protein composition of rat urine have been identified. Dialysis procedures have been evaluated for precipitation of alpha 2u-globulin and ultrafiltration used for further purification of the allergen.