Rapid identification and quantitation of compounds with forensic interest using fast liquid chromatography-ion trap mass spectrometry and library searching.
A fast liquid chromatography-electrospray tandem mass spectrometric (LC-ESI-MS-MS) method by using a monolithic column, gradient elution and ion trap mass spectrometer was developed for 14 forensically interesting and chemically different compounds. All compounds were eluted within 2.5 min and the total analysis time was 5 min including stabilisation time required for the next injection. All the compounds, basics, neutrals and acids were efficiently ionised by positive ion ESI. A laboratory library including MS-MS spectra and retention times was developed and tested. Results with 476 standard samples and 50 authentic samples showed that the compounds studied can be unambiguously identified with the library. A quantitative method was developed for the compounds using external calibration. The evaluation process showed good linearity of the method and reasonable repeatability. Limits of detection ranged from 10.0 to 50.0 ng/ml.
Pihlainen
Katja
K
Crime Laboratory, National Bureau of Investigation, P.O. Box 285, FIN-01301 Vantaa, Finland.
Sippola
Erkki
E
Kostiainen
Risto
R
D002853:Chromatography, Liquid / Q000379:methods*; D044707:Forensic Sciences; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*