Journal
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
Volume 857, Issue 2, Pages 296-300Publisher
ELSEVIER
DOI: 10.1016/j.jchromb.2007.07.039
Keywords
solid-phase extraction; high-performance liquid chromatography; nitroimidazoles; multi-residue analysis; meat sample
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A method was developed for the determination of the seven nitroimidazoles including metronidazole (MNZ), ronidazole (RNZ), dimetridazole (DMZ), tinidazole (TNZ), ornidazole (ONZ), secnidazole (SNZ) and the common metabolite of RNZ and hydroxydimetridazole (DMOHZ) in poultry and pork muscles by high-performance liquid chromatography (HPLC) with ultraviolet detection (UV). After extraction with ethyl acetate and evaporation, the nitroimidazoles were redissolved in ethyl acetate and purified using strong cation exchange (SCX) solid-phase extraction (SPE) column. The HPLC separation was carried through on a C-18 bonded silica column with a deionized water-methanol-acetonitrile mobile phase using a gradient elution procedure. The limit of detection of all the seven nitroimidazoles was 0.2 mu g/kg. The recoveries of the seven nitroimidazoles for chicken, pork and bacon samples spiked with 1-20 mu g/kg were in the range of 71.4-99.5%. The linearity is satisfactory with a correlation coefficient of > 0.998 at concentrations ranging from 0.7 to 60 mu g/kg. The relative standard deviations of 10 measurements for spiked chicken, pork and bacon samples at the concentration of 1 and 20 mu g/kg were in the range of 6.2-13.9% and 4.0-8.7%, respectively. The intra-day precision (n = 5) for nitroimidazoles residues in chicken spiked at 20 mu g/kg is 6.9%, and the inter-day precision for 5 days (n = 25) is 11%. The method is capable of identifying nitroimidazole residues at >= 0.7 mu g/kg levels and was applied in the determination of nitroimidazole residues in meat sample. (c) 2007 Published by Elsevier B.V.
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