Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7614892 | Journal of Chromatography B | 2018 | 24 Pages |
Abstract
A green and simple multiresidue method using capillary liquid chromatography (CLC) with UV-diode array detection (DAD) has been developed for the determination of sixteen benzimidazoles (BZs) and its metabolites in milk samples. The separation was achieved in <32â¯min, using a Zorbax XDB-C18 column (150â¯mmâ¯Ãâ¯0.5â¯mm I.D, 5â¯Î¼m), with a mobile phase consisting of 50â¯mM ammonium acetate (solvent A) and a mixture of acetonitrile/methanol (1:1â¯v/v) (solvent B), at a flow rate of 9â¯Î¼Lâ¯minâ1. The temperature of the column was 20â¯Â°C and 6â¯Î¼L of sample were injected. In spite of the complexity of milk samples, an effective, simple and fast sample preparation method called salting out-assisted liquid-liquid extraction (SALLE) was developed for the analysis of these compounds in cow milk samples. To obtain satisfactory extraction efficiencies for the studied analytes, several parameters affecting the SALLE procedure were optimized including the amount of sample, type and volume of the extraction solvent, and the nature and amount of the salt. Good linearity was obtained (R2â¯>â¯0.9985 for all BZs) with limits of detection (LOD) between 1.0 and 2.8â¯Î¼gâ¯kgâ1. Relative standard deviations of repeatability and intermediate precision were below 1.6 and 14.2%, respectively. Satisfactory recoveries between 79.1 and 99.6% were also obtained for three types of milk samples (cow, sheep and goat). The advantages of a miniaturized technique such as CLC in terms of better efficiencies and reduced solvent consumption, combined with the simplicity of the SALLE procedure, make this method a useful alternative for the monitoring of these residues at trace level.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Carmen Tejada-Casado, Monsalud del Olmo-Iruela, Ana M. GarcÃa-Campaña, Francisco J. Lara,