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Wu P.,U.S. Center for Disease Control and Prevention | Pan X.,U.S. Center for Disease Control and Prevention | Wang L.,U.S. Center for Disease Control and Prevention | Shen X.,U.S. Center for Disease Control and Prevention | Yang D.,Institute of Nutrition and Food Security
Food Control | Year: 2012

A survey of ethyl carbamate (EC) in fermented foods and beverages was conducted in Zhejiang province, China. The samples comprised 184 alcoholic beverages (rice wine, white spirit, wine, beer, and rice cooking wine), 33 flavorings (soy sauces and vinegars) and 20 fermented sufus. Rice wine contained up to 515 μg/kg with an average of 160 μg/kg, and rice cooking wine up to 206 μg/kg with an average of 87 μg/kg. White spirits, wine and beer contained EC at an average level of 72 μg/kg, 16 μg/kg and 2 μg/kg, respectively. EC was also detected in soy sauces and vinegars at an average level of 47 μg/kg and 27 μg/kg. In fermented sufus, EC was found at an average level of 63 μg/kg in normal sufu and 182 μg/kg in red sufu. © 2011 Elsevier Ltd. Source


Zhang L.,U.S. Center for Disease Control and Prevention | Wu P.,U.S. Center for Disease Control and Prevention | Zhang Y.,U.S. Center for Disease Control and Prevention | Jin Q.,U.S. Center for Disease Control and Prevention | And 3 more authors.
Analytical Methods | Year: 2014

A gas chromatography coupled with mass spectrometry (GC/MS) method for the simultaneous determination of chlorpromazine and diazepam in pork samples, which are two of the most often used antipsychotics, has been developed and validated. The samples were prepared and purified by solid-phase extraction (SPE), and then were analyzed by GC/MS. Chromatography was performed using an HP-5 MS 5% phenyl-95% methylpolysiloxane fused silica capillary column (30 m × 0.25 mm; film thickness 0.25 μm). The method had a linear calibration curve over the range 10-500 ng mL-1 (r > 0.99), recovery (>66.5% for chlorpromazine and >77.4% for diazepam), precision (%RSD < 11.5% for chlorpromazine and <9.5% for diazepam). The limit of quantification for both chlorpromazine and diazepam was 2.0 μg kg-1. This method can result in faster analysis, lower solvent consumption and less workload per sample while maintaining or even improving sensitivity. This journal is © 2014 The Royal Society of Chemistry. Source


Wu P.,U.S. Center for Disease Control and Prevention | Yang D.,Institute of Nutrition and Food Security | Zhang L.,U.S. Center for Disease Control and Prevention | Shen X.,U.S. Center for Disease Control and Prevention | And 6 more authors.
Journal of Separation Science | Year: 2012

A quantified method for the determination of 17 phthalate esters (PAEs) in edible vegetable oil by GC-MS with the pretreatment of acetonitrile extraction and silica/N-(n-Propyl)ethylenediamine-mixed SPE column was established. By the quantification of internal standard of D4-di(2-ethylhexyl) phthalate, a good linearity range of related 17 PAEs was observed. The correlation coefficient was ranged at 0.994∼1.000, and the standard lowest quantified level was 0.05∼0.15 mg/L. The spiking recoveries of 17 PAEs were 78.3∼108.9% with the relative standard deviations of 4.3∼12.1% (n = 6). The method detection limits were 0.1∼0.2 mg/kg. Meanwhile, PAEs were determined in 30 plastic buckets of edible vegetable oil from supermarkets in Hangzhou city of China. The survey of 30 oil samples showed di(2-ethylhexyl) phthalate (DEHP) had the 100% (30/30) detection rate. The levels of diisobutyl phthalate with 86.7% (26:30), di-n-butyl phthalate (DBP) with 70% (21:30) and diethyl phthalate with 10% (3:30) were detected. It was worth note that DBP with 16.7% (5:30) samples and DEHP with 10% (3:30) samples were beyond the regular migrating limit, which indicated that more attention should be paid to the PAEs in oil with plastic package. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Pan X.-D.,U.S. Center for Disease Control and Prevention | Wu P.-G.,U.S. Center for Disease Control and Prevention | Yang D.-J.,Institute of Nutrition and Food Security | Wang L.-Y.,U.S. Center for Disease Control and Prevention | And 2 more authors.
Food Control | Year: 2013

This report described a method for simultaneous determination of cyanuric acid (CYA) and melamine (MEL) in dairy products. The samples were extracted by a mixture of acetonitrile/water and cleaned by graphite carbon/strong cation exchange (CARB/SCX) mixed-mode solid phase extraction column. The CYA and MEL were derivatized with bis(trimethylsily1)trifluoroacetamide (BSTFA) containing 1% Trimethylchlorosilane (TMCS), and quantified with the internal standards of 15N3-cyanuric acid and 13C3-melamine by GC-MS. The results indicated that CARB/SCX mixed solid phase extraction column could be used for sample pretreatment. The fortification recoveries were 80.8-101.5%, and the relative standard deviations (RSDs) were 3.6-7.9%. The detection limits of CYA and MEL were 0.025mgkg-1 and 0.01mgkg-1 respectively. © 2012. Source

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