title: Multiresidue Analysis of Pesticides in Straw Roughage by Liquid Chromatography-Tandem Mass Spectrometry.
abstract: A multiresidue analytical method using a modification of the "quick, easy, cheap, effective, rugged, and safe" (QuEChERS) sample preparation approach combined with liquid chromatography-tandem mass spectrometry (LC-MS/MS) analysis was established and validated for the rapid determination of 69 pesticides at different levels (1-100 ng/g) in wheat and rice straws. In the quantitative analysis, the recoveries ranged from 70 to 120%, and consistent RSDs ≤ 20% were achieved for most of the target analytes (53 pesticides in wheat straw and 58 in rice straw). Almost all of the analytes achieved good linearity with R(2) > 0.98, and the limit of validation levels (LVLs) for diverse pesticides ranged from 1 to 10 ng/g. Different extraction and cleanup conditions were evaluated in both types of straw, leading to different options. The use of 0.1% formic acid or not in extraction with acetonitrile yielded similar final outcomes, but led to the use of a different sorbent in dispersive solid-phase extraction. Both options are efficient and useful for the multiresidue analysis of targeted pesticides in wheat and rice straw samples.
authors.affiliation: College of Science, China Agricultural University , Beijing 100193, China.
authors.forename: Zihao
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: College of Science, China Agricultural University , Beijing 100193, China.
authors.forename: Mengyuan
authors.initials: M
authors.lastname: Feng
authors.affiliation: College of Science, China Agricultural University , Beijing 100193, China.
authors.forename: Kechen
authors.initials: K
authors.lastname: Zhu
authors.affiliation: College of Science, China Agricultural University , Beijing 100193, China.
authors.forename: Lijun
authors.initials: L
authors.lastname: Han
authors.affiliation: Eastern Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture , 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038, United States.
authors.forename: Yelena
authors.initials: Y
authors.lastname: Sapozhnikova
authors.affiliation: Eastern Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture , 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038, United States.
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Lehotay
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004043:Dietary Fiber / Q000032:analysis*; D012275:Oryza / Q000737:chemistry*; D010573:Pesticide Residues / Q000032:analysis* / Q000302:isolation & purification; D018547:Plant Stems / Q000737:chemistry; D052616:Solid Phase Extraction; D053719:Tandem Mass Spectrometry / Q000379:methods*; D014908:Triticum / Q000737:chemistry*
chemical_list: D004043:Dietary Fiber; D010573:Pesticide Residues
keywords: LC-MS/MS; QuEChERS; animal feed; multiresidue pesticide analysis; rice and wheat straw