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Capillary electrophoresis immunoassay using magnetic beads
Author(s) -
Chen HongXu,
Busnel JeanMarc,
Gassner AnneLaure,
Peltre Gabriel,
Zhang XinXiang,
Girault Hubert H.
Publication year - 2008
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.200800106
Subject(s) - chromatography , capillary electrophoresis , immunoassay , chemistry , absorbance , capillary action , electrophoresis , analytical chemistry (journal) , materials science , antibody , immunology , composite material , biology
Abstract Protein A‐coated magnetic beads (0.3 μm) have been trapped in a small portion of a neutrally coated capillary (50 μm id). Anti‐β‐lactoglobulin (β‐LG) antibodies have then been immobilized on the beads through strong affinity with protein A to subsequently capture β‐LG from model or real samples. Once the immunocomplexes formed at physiological pH, a discontinuous buffer system has been used to release the partners and preconcentrate them by transient ITP. The antigens and antibodies have finally been separated by CZE and detected by UV absorbance. An LOQ of 55 nM has been achieved. This methodology has been applied to quantify native β‐LG in pasteurized and ultra‐high‐temperature‐treated bovine milk. All the described procedures, including immunosorbent preparation, sample extraction, cleanup, preconcentration, and separation are completely automated on a commercial CE instrument. As this CE immunoassay method is simple, rapid, selective, and sensitive, it should be a practical and attractive technology for the analysis of complicated biological samples.