Rapid and sensitive determination of sulfonamide residues in milk and chicken muscle by microfluidic chip electrophoresis.

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Wang L, Wu J, Wang Q, He C, Zhou L, Wang J, Pu Q

Rapid and sensitive determination of sulfonamide residues in milk and chicken muscle by microfluidic chip electrophoresis.

J Agric Food Chem. 2012 Feb 22;60(7):1613-8. doi: 10.1021/jf2036577. Epub 2012 Feb 8.

PubMed ID
22277081 [ View in PubMed
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Abstract

A new, rapid, and sensitive method was proposed for the determination of sulfonamide residues in milk and chicken muscle samples by microchip electrophoresis with laser-induced fluorescence detection. Separation of fluorescamine-labeled sulfonamides was accomplished by using a buffer containing 5 mmol/L boric acid and 1% (w/v) polyvinyl alcohol (PVA). The pH, amount of PVA, and concentration of boric acid in the running buffer were found to have great influence on the separation. By optimizing these conditions, the separation of four sulfonamides, sulfamethazine, sulfamethoxazole, sulfaquinoxaline, and sulfanilamide, was achieved within 1 min with limits of detection (S/N = 3) of 0.2-2.3 mug/L, which are well below the maximum residue limit. The proposed method also exhibited very good repeatability; the relative standard deviations for both within-day and between-day measurements were

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