Determination of acidic and neutral therapeutic drugs in human blood by liquid chromatography-electrospray tandem mass spectrometry.
A liquid chromatography-tandem mass spectrometry method using pneumatically assisted electrospray ionisation (LC-ESI-MS/MS) was developed for the simultaneous determination of paracetamol, naproxen, ibuprofen, etodolac, diclofenac, salicylic acid, lamotrigine, carbamazepine, 10-OH-carbazepine, phenytoin, phenobarbital, barbital, cyclobarbital, pentobarbital, amobarbital and caffeine in human live and post-mortem whole blood. The blood proteins were precipitated in a mixture of methanol and acetonitrile, and the extract was purified by ultrafiltration. The separation was performed on an ether-linked phenyl column with polar endcapping, and both negative and positive ESI were applied. Matrix-matched standards were used for calibration. The relative intra-laboratory reproducibility standard deviations were, in general, better than 8% at concentrations in the therapeutic range. The mean true recoveries were in the range 92-101% for the live blood and 84-101% for the post-mortem blood.
Sørensen
Lambert K
LK
Section for Toxicology and Drug Analysis, Department of Forensic Medicine, Aarhus University, Brendstrupgaardsvej 100, 8200 Aarhus N, Denmark. lks@forensic.au.dk
D000700:Analgesics / Q000097:blood*; D000927:Anticonvulsants / Q000097:blood*; D002110:Caffeine / Q000097:blood; D000697:Central Nervous System Stimulants / Q000097:blood; D002853:Chromatography, Liquid; D053593:Forensic Toxicology; D006801:Humans; D057230:Limit of Detection; D015203:Reproducibility of Results; D021241:Spectrometry, Mass, Electrospray Ionization
D000700:Analgesics; D000927:Anticonvulsants; D000697:Central Nervous System Stimulants; D002110:Caffeine