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Polysaccharides as labels for antibodies in electron microscopy

SP Kent and DV Wilson

Two polysaccharides, dextran 250 and dextran 70, were covalently linked to antibody molecules, antihuman immunoglobulin G and antihuman type O red blood cells. In electron microscope preparations exposed to lead citrate, polysaccharides, because they chelate lead, were quite dense. Polysaccharides served as a tag for the antibody molecules. Also, bacterial dextran 1355 was used to demonstrate antibody molecules on the surface of ascites tumor cells which are known to be producing a specific antibody to bacterial dextran 1355. The varying sized polysaccharide molecules that are readily available commercially, the high electron density of the polysaccharides after lead staining and a mild procedure for covalently linking polysaccharide to antibody make polysaccharides attractive as particulate labels for antibody in electronmicroscopy.

Volume 23, Issue 3, pp. 169-173, 03/01/1975
Copyright © 1975 by The Histochemical Society


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