期刊
JOURNAL OF SEPARATION SCIENCE
卷 35, 期 16, 页码 2040-2047出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/jssc.201200128
关键词
High performance liquid chromatography; Methimazole; Response surface methodology; Ion-pair based hollow fiber liquid phase microextraction
Ion-pair based hollow fiber liquid phase microextraction (IP-HFLPME) coupled with high performance liquid chromatography-ultraviolet detection was applied for the preconcentration and determination of methimazole in biological samples and animal feed. Optimization of the conditions for the high extraction efficiency was studied simultaneously using the experimental design. For the first step, the PlackettBurman design was applied to screen the significant factors on the extraction efficiency. Central composite design (CCD) was then used for the optimization of important factors and the response surface equations were obtained. The optimum experimental conditions were donor phase pH, 12.2; extraction temperature, 45 degrees C; extraction time, 50 min; sodium perchlorate concentration, 1.5 M; cetyltrimethylammonium bromide concentration, 0.65 mM, and without salt addition in donor phase. The limit of detection and the dynamic linear range were in the range of 0.10.7 mu g L-1 and 0.51000 mu g L-1, respectively. Preconcentration factors were obtained in the range of 93155 in different matrices. Finally, the performance of the proposed method was tested for the determination of trace amounts of methimazole in plasma, urine, bovine milk, and animal feed samples, and satisfactory results were obtained (RSDs < 7.1%).
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