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Cui S.,Food and Agricultural Products Testing Agency | Chen W.,Ocean University of China
Se pu = Chinese journal of chromatography / Zhongguo hua xue hui | Year: 2013

On the basis of optimization of solid phase extraction adsorbent, eluting solvent types and amounts, a gas chromatography-mass spectrometric method was developed for the determination of 193 pesticide residues in vegetables and fruits. The analytes were extracted from the samples using acetonitrile. The extract was cleaned-up with a C18/PSA solid-phase extractor, eluted by acetonitrile and analyzed by GC-MS under selected ion monitoring (SIM) mode using triphenyl phosphate (TPP) as internal standard. The linear range was from 10 to 1 000 microg/L for 130 pesticides, from 20 to 1 000 microg/L for 34 pesticides, from 50 to 1 000 microg/L for 26 pesticides, from 100 to 1 000 microg/L for the other 3 pesticides with the good correlation coefficients (r > or = 0.996 7). The limits of detection were 0.04 - 8.26 microg/kg. The mean recoveries of the pesticides were 71.6% -117.9%. The relative standard deviations were 3.0% - 11.8%. This method is simple, rapid, sensitive and specific. It is appropriate for the simultaneous identification and quantification of the multi-residues in fruits and vegetables. Source


Xu M.,Inspection and Quarantine Technology Center | Cui S.,Food and Agricultural Products Testing Agency | Liu T.,Inspection and Quarantine Technology Center | Qian J.,Inspection and Quarantine Technology Center | And 3 more authors.
Chinese Journal of Chromatography (Se Pu) | Year: 2013

A high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/ MS) method was established for the determination of inabenfide in fruits, vegetables, tea, honey, cereals and animal-derived foods. The food samples were extracted with acetonitrile, then purified by dispersion solid phase extraction using primapSrlondary amine (PSA) and Cl8 as solid phase. The residue was determined and confirmed by HPLC-MS/MS and quantified by external standard method. The mass spectrometry detection was operated with electrospray in positive ionization mode and inabenfide was identified in multiple reaction monitoring (MEM) mode. The interference of matrix was reduced by the matrix-matched calibration standard curves. The linear range of the method was 1-100 μg/kg, with the correlation coefficients (r2) of 0.998-0.999. The recoveries of inabenfide spiked in food samples were 85. 2% -112.40/0 atthe spiked levels of 5, 10, 50 μg/kg. The relative standard deviations (RSDs) were less than 8. 5%. The limits of detection (LODs) were 0.08-1.64 μg/kg, and the limits of quantification (LOQs) were 0. 30-5. 48 μg/kg. The results showed that the proposed method is sensitive and accurate for the determination of inabenfide in foodstuffs. Source


Guo Q.,Huangdao Entry Exit Inspection and Quarantine Bureau | Cui S.,Food and Agricultural Products Testing Agency | Liu J.,Food and Agricultural Products Testing Agency | Liu R.,Food and Agricultural Products Testing Agency
Chemistry Bulletin / Huaxue Tongbao | Year: 2013

A method for determining chlorantraniliprole, metaflumizone, flubendiamide, chromafenozide, tebufenozide and methoxyfenozide residues in fruits and vegetables by high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) was developed. The analytes were extracted from the samples using solution of 1% acetic acid in acetonitrile, and purified by dispersion solid phase extration using PSA and C18 as solid phase, then analyzed by HPLC-MS/MS with multiple-reaction monitoring(MRM). A good linearity was obtained within the concentration range of 1 ~ 100μg/L, the correlation coefficients were 0.9998 and 0.9999. The limit of quantification for the method was 0.19 ~ 3.49μg/kg. The limit of detection for the method was 0.088 ~ 1.05μg/kg. Average recoveries for six new insecticides in four samples at spiked levels of 5 ~ 50μg/kg were between 81.1% and 105.1%, with a relative standard deviations between 2.8% and 8.5%. Source

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