title: Analysis of etoxazole in red pepper after major modification of QuEChERS for gas chromatography-nitrogen phosphorus detection.
abstract: A major modification to the QuEChERS (quick, easy, cheap, effective, rugged and safe) method was developed for the analysis of etoxazole in red pepper using gas chromatography coupled with a nitrogen-phosphorus detector. Etoxazole was extracted with acetonitrile, partitioned with magnesium sulfate and purified with a solid-phase extraction cartridge. The method showed good linearity with a determination coefficient (R(2) ) of 0.998 for the 0.02-2.0 mg/L concentration range. The method was validated using blank red pepper spiked at 0.2 and 1.0 mg/kg, and the average recovery rate was 74.4-79.1% with relative standard deviations <5% for intra- and inter-day precision. The limits of detection and quantification were 0.007 and 0.02 mg/kg, respectively. The developed method was successfully applied to field-incurred samples, and the presence of etoxazole residues was confirmed using gas chromatography/mass spectrometry.
authors.affiliation: Biotechnology Research Institute, Chonnam National University, Gwangju, 500-757, Republic of Korea.
authors.forename: Jin
authors.initials: J
authors.lastname: Jang
authors.forename: Md Musfiqur
authors.initials: MM
authors.lastname: Rahman
authors.forename: A M
authors.initials: AM
authors.lastname: Abd El-Aty
authors.forename: Ah-Young
authors.initials: AY
authors.lastname: Ko
authors.forename: Jong-Hyouk
authors.initials: JH
authors.lastname: Park
authors.forename: Jeong-Heui
authors.initials: JH
authors.lastname: Choi
authors.forename: Ki Hun
authors.initials: KH
authors.lastname: Park
authors.forename: Angel
authors.initials: A
authors.lastname: Yang
authors.forename: Young Mi
authors.initials: YM
authors.lastname: Seo
authors.forename: Jae-Han
authors.initials: JH
authors.lastname: Shim
mesh_terms: D002212:Capsicum / Q000737:chemistry*; D002849:Chromatography, Gas / Q000295:instrumentation / Q000379:methods; D005506:Food Contamination / Q000032:analysis; D010080:Oxazoles / Q000032:analysis* / Q000302:isolation & purification*; D010573:Pesticide Residues / Q000032:analysis* / Q000302:isolation & purification*; D052616:Solid Phase Extraction / Q000379:methods*
chemical_list: D010080:Oxazoles; D010573:Pesticide Residues; C508136:etoxazole
keywords: Etoxazole; QuEChERS; gas chromatography; red pepper; residue analysis