title: Immunoassay by capillary electrophoresis with quantum dots.
abstract: The application of quantum dots in capillary electrophoresis immunoassay was studied for the first time. Quantum dots were conjugated with antibody and subsequently tested by electrophoretic separation of free antibody and antibody-antigen complex. Antibody was fluorescently labeled by quantum dots via conjugation procedures and its electrophoretic characteristics were effectively modified due to the attachment of quantum dots. The determination of human IgM by direct CE based immunoassay could be easily achieved by simply changing the pH value of separation buffer. Polymer additive influenced the separation too but the effect was not as significant as buffer pH adjustment. Satisfactory separation of complex from free antibody could be achieved with 20mM sodium tetraborate as separation buffer, at pH 9.8. The immunoassay application of quantum dots in CE offers considerable advantages and can be readily applied to other large bio-molecules.
authors.affiliation: Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Republic of Singapore.
authors.forename: Hua-tao
authors.initials: HT
authors.lastname: Feng
authors.forename: Wai-Siang
authors.initials: WS
authors.lastname: Law
authors.forename: Li-Jun
authors.initials: LJ
authors.lastname: Yu
authors.forename: Sam Fong-Yau
authors.initials: SF
authors.lastname: Li
mesh_terms: D019075:Electrophoresis, Capillary / Q000379:methods*; D006801:Humans; D007118:Immunoassay / Q000379:methods*; D007075:Immunoglobulin M / Q000302:isolation & purification; D045663:Quantum Dots
chemical_list: D007075:Immunoglobulin M