Immunoenzymatic determination of antibody-bound soluble antigens ofTrypanosoma cruzi.

Anti-Major Cathodic Antigen (MCA) monospecific immunoglobulins ofT. cruzi have been used for the preparation of polyamide-linked immunoadsorbents. A high proportion of serologically positive patients with Chagas disease show the presence of a soluble antigen complexed with human immunoglobulins, which complex binds to those immunoadsorbents as determined by a double sandwich reaction and a peroxidase final determination.

Peanut agglutinin affinity chromatography of Trypanosoma cruzi glycoproteins.

Glycoproteins from Trypanosoma cruzi epimastigotes have been extracted by diiodosalycilic acid and lithium salts, and phenol-water biphasic partition. Peanut agglutinin has been used in a one step preparative method for fractionating the total extract in order to separate the so-called galactose-terminal glycoproteins. The different fractions have been studied by SDS electrophoresis, ultracentrifugation and immunoelectrophoresis techniques.