[Lipoproteins as serum inhibitors in rubella hemagglutination inhibition test and their elimination (author's transl)].

Lipoproteins of 20 human sera were isolated by flotation centrifugation and tested for inhibitory activity in rubella HI-test. Low density lipoproteins (LDL) showed the highest titers with an average of 1:238,0, whereas the others (VLDL, HDL) had lower titers (see tab. 2). The greatest reduction of all classes of lipoproteins was achieved with kaolin treatment. Heparin-manganous chloride and dextran sulfate-calcium chloride method mainly reduced the LDL (84.4 resp. 78.7%). In a comparative test sera treated with the heparin procedure showed higher antibody titers than those treated with dextran sulfate.