title: Pressure-assisted capillary electrochromatography with electrospray ionization-mass spectrometry based on silica-based monolithic column for rapid analysis of narcotics.
abstract: A pressure-assisted CEC (pCEC) with ESI-MS based on silica-based monolithic column was developed for rapid analysis of narcotics. Combining the extremely high permeability and separation efficiency of silica-based monolithic column with the high selectivity and sensitivity of pCEC-ESI-MS, the developed system exhibited its prominent advantages in separation and detection. A systematic investigation of the pCEC separation and ESI-MS detection parameters was performed. Experiment results showed that the optimized separation efficiency could be obtained at 8 bar assisted pressure with 25 kV separation voltage, using the solution containing 65% ACN v/v and 20 mmol/L ammonium acetate with pH 6.0 as running buffer. 3 microL/min of sheath liquid was considered as the optimized flow rate since it could provide the maximum signal intensity. Under the optimum conditions, the tested five narcotics could be completely separated within 10 min with the detection limit in the range of 2.0-80 nmol/L. The proposed method has been successfully used for detection of narcotics in real urine samples.
authors.affiliation: Ministry of Education Key Laboratory of Analysis and Detection Technology for Food Safety, Department of Chemistry, Fuzhou University, Fuzhou, Fujian, P. R. China.
authors.forename: Minghua
authors.initials: M
authors.lastname: Lu
authors.forename: Lan
authors.initials: L
authors.lastname: Zhang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Feng
authors.forename: Shifei
authors.initials: S
authors.lastname: Xia
authors.forename: Yuwu
authors.initials: Y
authors.lastname: Chi
authors.forename: Ping
authors.initials: P
authors.lastname: Tong
authors.forename: Guonan
authors.initials: G
authors.lastname: Chen
mesh_terms: D053801:Capillary Electrochromatography / Q000379:methods*; D009294:Narcotics / Q000032:analysis* / Q000652:urine; D011312:Pressure; D012822:Silicon Dioxide; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*; D015813:Substance Abuse Detection / Q000379:methods*
chemical_list: D009294:Narcotics; D012822:Silicon Dioxide