Methods are described for the isolation and characterization of picogram quantities of anti-dextran antibodies. 14C-dextrans produced by using the dextransucrases of Leuconostoc mesenteroides strains B1355 and B512 were used in a radioimmunoassay. The specificity of this assay was verified by using cell cytoplasmic lysates from mouse plasmacytomas, J558 (anti-α 1→3 dextran) and W3129 (anti-α 1→6 dextran). Dextran produced by strain B1355 and insolubilized with epichlorohydrin was used as an immunoabsorbent.

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