Voltammetric Evaluation of the Binding between Wheat Germ Agglutinin and Thionine/Glucose-modified Magnetic Microbeads

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Abstract

The binding between glucose residues and wheat germ agglutinin (WGA) on thionine/glucose-modified magnetic microbeads was evaluated using voltammetry. Thionine is an electroactive compound and has two amino groups. Thionine was immobilized to magnetic beads via cross-linking of the amino groups on the beads with an amino group on thionine. Glucose was bound to the other amino group of thionine via the formation of a Schiff base. The beads were only several micrometers in size the same size, as cells. WGA-binding to glucose on the bead surface blankets the thionine moiety. Thus, WGA-binding could be detected as a decrease in peak current of the thionine moiety.

Journal

  • Analytical Sciences

    Analytical Sciences 24 (6), 717-720, 2008

    The Japan Society for Analytical Chemistry

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