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Wang G.-M.,Chongqing University | Wang G.-M.,Chongqing Import and Export Food Safety Engineering Technology Research Center | Li Y.-G.,Chongqing University | Li Y.-G.,Chongqing Import and Export Food Safety Engineering Technology Research Center | And 5 more authors.
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2011

The trichlorfon, dichlorvos, and coumafos are commonly used as organophosphorus pesticides to control pests or natural enemies of bees, but they easily contaminate the honey. A simultaneous determination method for trichlorfon, dichlorvos and coumafos residues in honey is developed by high performance liquid chromatography tandem mass spectrometry (HPLC-MS/MS). Samples are extracted with ethyl acetate and concentrated extracts, and then the residue is dissolved by methanol, and separated by HPLC, detected by electrospray ionization (ESI)-MS/MS with multiple reaction monitoring mode (MRM). It is found that the linear ranges of the three organophosphate pesticides are 20~500 μg/L with correlation coefficients over 0.994, the detection limits (LODs) are 0.1 μg/kg and the limits of quantification (LOQs) are 4 μg/kg for all of the three pesticides. The average recoveries of the three pesticides in spiked honeies at concentration levels of 10~40 μg/kg range from 78.5% to 96.8%, and the relative standard deviations are in the range of 9.1%~13.1%.


Qu C.H.,Southwest University | Li X.L.,Chongqing Import and Export Food Safety Engineering Technology Research Center | Zhang L.,Chongqing Import and Export Food Safety Engineering Technology Research Center | Xi C.X.,Chongqing Import and Export Food Safety Engineering Technology Research Center | And 3 more authors.
Chromatographia | Year: 2011

An ultra performance liquid chromatography (UPLC) method was established for the simultaneous determination of cimaterol, salbutamol, terbutaline, and ractopamine in feed. Target compounds were extracted with methanol and centrifuged. The supernatant was then transferred and concentrated, and applied to a solid phase extraction MCX cartridge for clean-up before UPLC analysis. The calibration curves for the four β-agonists were good linear in concentration range of 0.05-1.0 μg mL-1 with the correlation coefficients (r) over 0.999. The average recoveries were in the range of 90.1-101.4% with relative standard deviation values lower than 8.0%. © 2011 Springer-Verlag.

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