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An antiserum raised to the ferric enterobactin receptor protein of Escherichia coli, isolated from SDS-polyacrylamide gels, contained high-titre antibodies to the lipopolysaccharide (LPS) of E. coli O111. This antiserum was used to show that proteins dissected from polyacrylamide gels can be contaminated with comigrating LPS at levels below those detectable by very sensitive silver staining methods. Using this antiserum it was also shown that the procedures used to extract proteins from polyacrylamide gels can alter the molecular structure and, consequently, the antigenic properties of the contaminating LPS.

Antigenic Alteration of Contaminating Lipopolysaccharide during Extraction of Escherichia coli Outer-membrane Proteins from Polyacrylamide Gels