期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 60, 期 7, 页码 1613-1618出版社
AMER CHEMICAL SOC
DOI: 10.1021/jf2036577
关键词
microfluidic chip electrophoresis; fluorescence detection; sulfonamides; fluorescamine; polyvinyl alcohol
资金
- Chinese Ministry of Education [108119]
- Natural Science Foundation of China [20875041]
- Program for New Century Excellent Talents in University [NCET-08-0255]
- Fundamental Research Funds for the Central Universities [lzujbky-2010-42, lzujbky-2012-k11]
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 mu g/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 <= 3.0%. With a simplified sample pretreatment protocol, fast determination of sulfonamides in real samples was successfully performed with standard addition recoveries of 93.3-100.8 and 82.9-92.3%, respectively.
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