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KMID : 1023520070300030421
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Korean Journal of Veterinary Service
2007 Volume.30 No. 3 p.421 ~ p.428
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Examination of ivermectin residues in raw milk after skin administration
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Bark Jun-Jo
Youk Ji-Hea
Kim Hu-Kyoung
Park Hye-Won
Kim In-Kyung
Lee Woo-Seong
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Abstract
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This study was conducted two kinds of aims: 1) to modify the analytical methods (conditions) by high performance liquid chromatography - fluorescence detector for the detection of residual ivermectin in raw milk, 2) to provide basic information for the evaluation of standard of the residual ivermectin in raw milk. It could be considerable that negative ion spectra can be better method in the LC/MS analysis for the detection of residues, Characteristic daughter ions were observed in negative ion spectra, however, linear line was not formed in positive ion one. Three Holstein cows () were applied to commercial ointment of ivermectin just one time at the first day of test, and residues in raw milk were examined for 20day after administration. The limit of detection (LOD) was 0.65ng (n=5) by HPLC/FLD, and recovery rates were . The peak was observed at the 4th day, and residues lasted to the end. Thus ivermectin was prohibited when lactating.
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KEYWORD
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Ivermectin, Liquid chromatography- fluorescence detector, Negative ion spectra, Daughter ion, LC/MS
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