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Masking of protein antigen by modification of amino groups with carbobenzoxychloride (benzyl chloroformate) and demasking by treatment with nonspecific protease

H Takamiya, W Bodemer and A Vogt

Cryostat sections of various substrates were treated with carbobenzoxychloride in acetone to modify antigens. By applying specific fluorescent antibodies, it could be shown that the antigenic determinants of rabbit gamma-globulin and bovine insulin were totally masked. The antigenicity of ACTH was markedly reduced, whereas the polysaccharide antigens of Salmonella typhimurium were only partially masked. After masking, antigenicity could be restored by treatment with nonspecific protease. The reversible protection of amino groups by carbobenzoxychloride may be a way to preserve protein antigens during embedding in plastics, as such materials also bind to amino groups, blocking the antigenicity of proteins.

Volume 26, Issue 11, pp. 914-920, 11/01/1978
Copyright © 1978 by The Histochemical Society


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