title: [Rapid identification of 22 abused drugs and organophosphorus pesticides in blood by LC-MS/MS].
abstract: OBJECTIVE
  To develop a method for rapid identification of 22 abused drugs and organophosphorus pesticides in the blood.
  
  
  METHODS
  Liquid chromatography-tandem mass spectrometry (LC-MS/MS) in multiple-reaction monitoring mode (MRM) was employed for detecting the drugs and pesticides in the blood. The MRM database and criteria for identification were established, and ethyl acetate was used for extraction of the drugs. After 3 rounds of extractions of the blood sample (1 mL) using 2 mL ethyl acetate, the extract was vortexed for 3 min and centrifuged at 5000 r/min. Each organic phase was combined and evaporated by gentle N2 gas. The residue was re-dissolved in 100 L mobile phase, from which 5 L was taken for LC-MS/MS detection.
  
  
  RESULTS
  The detection of the 22 target compounds could be completed within 10 min. The limit of detection of the target compound ranged from 0.03 to 6.00 ng/ml. Satisfactory results were obtained in proficiency testing program organized by China National Accreditation Service for Conformity Assessment.
  
  
  CONCLUSIONS
  The method we established is rapid, selective and sensitive for detecting the 22 abused drugs and organophosphorus pesticides.
authors.affiliation: Hygiene Detection Center, School of Public Health and Tropical Medicine, Southern Medical University, Guangzhou 510515, China. liu_tt@hotmail.com
authors.forename: Hong-tao
authors.initials: HT
authors.lastname: Liu
authors.forename: An-de
authors.initials: AD
authors.lastname: Ma
mesh_terms: D001774:Blood Chemical Analysis / Q000379:methods*; D002853:Chromatography, Liquid; D016208:Databases, Factual; D013287:Illicit Drugs / Q000097:blood*; D057230:Limit of Detection; D009943:Organophosphorus Compounds / Q000097:blood*; D010573:Pesticide Residues / Q000097:blood*; D053719:Tandem Mass Spectrometry; D013997:Time Factors
chemical_list: D013287:Illicit Drugs; D009943:Organophosphorus Compounds; D010573:Pesticide Residues