AN ELECTROPHORETIC ANALYSIS OF PROTEIN COMPONENTS OF HUMAN PAROTID SALIVA

Fresh samples of parotid saliva from one subject were analyzed by complementary anionic and cationic polyacrylamide disc gel electrophoresis systems. Nineteen protein components were evidenced with Amido Black, whereas a total of 30 discrete components were revealed by the more sensitive dye, Coomassie Brilliant Blue. The polyacrylamide gel patterns were qualitatively reproducible and have been described by grouping bands into regions designated A or A′, B or B′, C and D. Regions A and A′ contain protein and neutral carbohydrate. Regions B and B′ contain all of the α-amylase activity of parotid saliva, in the form of four or more isoenzymes. The dominant B-band also possesses acidic carbohydrate material. Region C contains five acidic components one of which contains acidic carbohydrate. Five cationic components are consistently seen in Region D. © 1968.