title: A modified QuEChERS method for simultaneous determination of flonicamid and its metabolites in paprika using tandem mass spectrometry.
abstract: A modified quick, easy, cheap, effective, rugged and safe (QuEChERS) acetate-buffered sample preparation method was developed to improve extraction recovery of flonicamid and its two metabolites (4-trifluoromethylnicotinic acid and N-(4-trifluoromethylnicotinoyl)glycine) in paprika followed by analysis using tandem mass spectrometry. Acidified acetonitrile (containing 5% acetic acid) was used as an extraction solvent and partitioning was carried out using sodium chloride. The extract was then cleaned up using C18. The linearity over a concentration range of 0.005-1 μg/mL was good with a determination coefficient (R(2))>0.9997. Recovery at three different fortification levels was 82.2-101.7% with a relative standard deviation <10 for all analytes. The limit of quantitation of 0.01 mg/kg was quite lower than the maximum residue level set by the Korea Food and Drug Administration (2mg/kg). The method was successfully applied to determine flonicamid and its metabolites from field incurred samples. The undulating residue pattern observed for the parent analyte together with its metabolites could explain the movement behavior of systemic pesticides into plants over time.
authors.affiliation: Biotechnology Research Institute, College of Agriculture and Life Sciences, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 500-757, Republic of Korea.
authors.forename: Ah-Young
authors.initials: AY
authors.lastname: Ko
authors.affiliation: Biotechnology Research Institute, College of Agriculture and Life Sciences, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 500-757, Republic of Korea; Department of Pharmacology, Faculty of Veterinary Medicine, Cairo University, 12211 Giza, Egypt. Electronic address: abdelaty44@hotmail.com.
authors.forename: A M
authors.initials: AM
authors.lastname: Abd El-Aty
authors.affiliation: Biotechnology Research Institute, College of Agriculture and Life Sciences, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 500-757, Republic of Korea.
authors.forename: Md Musfiqur
authors.initials: MM
authors.lastname: Rahman
authors.affiliation: Biotechnology Research Institute, College of Agriculture and Life Sciences, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 500-757, Republic of Korea.
authors.forename: Jin
authors.initials: J
authors.lastname: Jang
authors.affiliation: Biotechnology Research Institute, College of Agriculture and Life Sciences, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 500-757, Republic of Korea.
authors.forename: Sung-Woo
authors.initials: SW
authors.lastname: Kim
authors.affiliation: Biotechnology Research Institute, College of Agriculture and Life Sciences, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 500-757, Republic of Korea.
authors.forename: Jeong-Heui
authors.initials: JH
authors.lastname: Choi
authors.affiliation: Biotechnology Research Institute, College of Agriculture and Life Sciences, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 500-757, Republic of Korea. Electronic address: jhshim@chonnam.ac.kr.
authors.forename: Jae-Han
authors.initials: JH
authors.lastname: Shim
mesh_terms: D002212:Capsicum / Q000737:chemistry*; D009536:Niacinamide / Q000031:analogs & derivatives* / Q000032:analysis / Q000737:chemistry; D010575:Pesticides / Q000032:analysis*; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D010575:Pesticides; D009536:Niacinamide; C524822:flonicamid
keywords: Improved sample preparation; Method development; Paprika; Tandem mass spectrometry; Validation