Journal
FOOD CHEMISTRY
Volume 126, Issue 2, Pages 779-785Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2010.11.072
Keywords
Sulphonamides; Milk; Cloud point extraction; High performance liquid chromatography
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An efficient and environmentally friendly analytical methodology is proposed for extracting and preconcentrating seven sulphonamides from milk prior to high performance liquid chromatography with ultraviolet detection (HPLC-UV). It is based on the induction of micellar organised media by using Triton X-100 as an extracting solvent. Optimisation of the factors affecting de-emulsification and phase separation was performed. The limits of detection (LOD) of the sulphonamides ranged from 2.23 to 9.79 mu g/L, the linear range of quantitation for all analytes was approximately 0.05-2.0 mg/L and the correlation coefficients of the calibration curves were >= 0.9999. The average recoveries and relative standard deviations were in the range of 67.0-105.7% and 0.93-8.31%, respectively, for fortified samples at 0.05, 0.10 and 0.20 mg/L of each sulphonamide. (C) 2010 Elsevier Ltd. All rights reserved.
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