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In this service, an aptamer affinity sorbent would be prepared for clean-up, preconcentration, separation and characterization of a food allergen protein by on-line aptamer affinity solid-phase extraction capillary electrophoresis-mass spectrometry (AA-SPE-CE-MS). SPE microcartridges would be packed with a sorbent based on magnetic bead particles modified with an aptamer against the target lectin protein concanavalin A (Con A).