title: [Study on residue analysis method of imidacloprid in Ephedrae sinica].
abstract: OBJECTIVE
  To establish residue analysis method of imidacloprid in Ephedra sinica by HPLC.
  
  
  METHODS
  Imidacloprid was extracted with dichloromethane, cleaned up with chromatography column, then separated on Spherisorb C18 column by using Methanol-water (20:80), detected at 270 nm.
  
  
  CONCLUSIONS
  The limit of detection (LOD) and limit quantification (LOQ) were 0.4 x 10(-9) g and 0.02 mg x kg(-1), mean recovery and related standard deviation (RSD) were 85.37%-90.65% and 2.23%-3.45%. It is concluded that the method could satisfy the pesticide residue analysis demands in sensitivity, accuracy and precision.
authors.affiliation: Institute of Medicinal Plant Development, Peking Union Medicinal College, Beijing 100094, China.
authors.forename: Mei-yan
authors.initials: MY
authors.lastname: Chen
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
authors.forename: Jian
authors.initials: J
authors.lastname: Xue
authors.forename: Jing
authors.initials: J
authors.lastname: Yu
authors.forename: Hui-zhen
authors.initials: HZ
authors.lastname: Cheng
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods; D029790:Ephedra sinica / Q000737:chemistry*; D007093:Imidazoles / Q000032:analysis*; D007306:Insecticides / Q000032:analysis; D000073943:Neonicotinoids; D009574:Nitro Compounds / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D010946:Plants, Medicinal / Q000737:chemistry; D015203:Reproducibility of Results
chemical_list: D007093:Imidazoles; D007306:Insecticides; D000073943:Neonicotinoids; D009574:Nitro Compounds; D010573:Pesticide Residues; C082359:imidacloprid