PMID- 29775427 OWN - NLM STAT- MEDLINE DCOM- 20180917 LR - 20180917 IS - 1944-0057 (Electronic) IS - 1944-0057 (Linking) VI - 35 IP - 8 DP - 2018 Aug TI - Determination of fipronil and its metabolites in chicken egg, muscle and cake by a modified QuEChERS method coupled with LC-MS/MS. PG - 1543-1552 LID - 10.1080/19440049.2018.1472395 [doi] AB - An easy-to-use method for determining the levels of fipronil and its metabolites (fipronil-desulfinyl, fipronil-sulfone and fipronil-sulfide) in chicken egg, muscle and cake was developed and validated using a modified quick, easy, cheap, effective, rugged and safe (QuEChERS) approach coupled with liquid chromatography-tandem mass spectrometry (LC-MS/MS) analysis. The samples were extracted using acetonitrile, salted out with sodium chloride at -20 degrees C, and then purified by combined PSA and C18 phases and anhydrous magnesium sulphate. The recoveries were 80.4-119% with relative standard deviations (RSDs) < 10% for the different matrixes. The validated method was used to analyse the target compounds in 214 real samples collected in Beijing. The metabolite fipronil-sulfone was detected in most of the samples and was identified as the main residue in the egg and cake. The method was validated using a proficiency test for fipronil in products of animal origin published by Wageningen University & Research in 2017. FAU - Guo, Qiaozhen AU - Guo Q AD - a College of Science , Beijing University of Chemical Technology , Beijing , China. AD - b Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food Poisoning , Beijing Center for Disease Control & Prevention , Beijing , China. FAU - Zhao, Shan AU - Zhao S AD - b Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food Poisoning , Beijing Center for Disease Control & Prevention , Beijing , China. FAU - Zhang, Jing AU - Zhang J AD - b Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food Poisoning , Beijing Center for Disease Control & Prevention , Beijing , China. FAU - Qi, Kailun AU - Qi K AD - b Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food Poisoning , Beijing Center for Disease Control & Prevention , Beijing , China. FAU - Du, Zhenxia AU - Du Z AD - a College of Science , Beijing University of Chemical Technology , Beijing , China. FAU - Shao, Bing AU - Shao B AD - b Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food Poisoning , Beijing Center for Disease Control & Prevention , Beijing , China. AD - c Beijing Advanced Innovation Center for Food Nutrition and Human Health , China Agricultural University , Beijing , China. LA - eng PT - Journal Article DEP - 20180619 PL - England TA - Food Addit Contam Part A Chem Anal Control Expo Risk Assess JT - Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment JID - 101485040 RN - 0 (Insecticides) RN - 0 (Pyrazoles) RN - QGH063955F (fipronil) SB - IM MH - Animals MH - Chickens MH - Chromatography, Liquid MH - Food Contamination/*analysis MH - Insecticides/*analysis/metabolism MH - Muscles/*chemistry MH - Ovum/*chemistry MH - Pyrazoles/*analysis/metabolism MH - Tandem Mass Spectrometry OTO - NOTNLM OT - Fipronil and its metabolites OT - cake OT - chicken egg OT - muscle OT - ultra-performance liquid chromatography-tandem mass spectrometry EDAT- 2018/05/19 06:00 MHDA- 2018/09/18 06:00 CRDT- 2018/05/19 06:00 PHST- 2018/05/19 06:00 [pubmed] PHST- 2018/09/18 06:00 [medline] PHST- 2018/05/19 06:00 [entrez] AID - 10.1080/19440049.2018.1472395 [doi] PST - ppublish SO - Food Addit Contam Part A Chem Anal Control Expo Risk Assess. 2018 Aug;35(8):1543-1552. doi: 10.1080/19440049.2018.1472395. Epub 2018 Jun 19.