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De Jager A.D.,Drugs of Abuse Laboratory | Bailey N.L.,Drugs of Abuse Laboratory
Journal of Chromatography B: Analytical Technologies in the Biomedical and Life Sciences | Year: 2011

A rapid LC-MS/MS method for confirmatory testing of five major categories of drugs of abuse (amphetamine-type substances, opiates, cocaine, cannabis metabolites and benzodiazepines) in urine has been developed. All drugs of abuse mandated by the Australian/New Zealand Standard AS/NZS 4308:2008 are quantified in a single chromatographic run. Urine samples are diluted with a mixture of isotope labelled internal standards. An on-line trap-and-flush approach, followed by LC-ESI-MS/MS has been successfully used to process samples in a functioning drugs of abuse laboratory. Following injection of diluted urine samples, compounds retained on the trap cartridge are flushed onto a reverse-phase C18 HPLC column (5-μm particle size) with embedded hydrophylic functionality. A total chromatographic run-time of 15. min is required for adequate resolution. Automated quantitation software algorithms have been developed in-house using XML scripting to partially automate the identification of positive samples, taking into account ion ratio (IR) and retention times (Rt). The sensitivity of the assay was found to be adequate for the quantitation of drugs in urine at and below the confirmation cut-off concentrations prescribed by AS/NZS 4308:2008. © 2011 Elsevier B.V. Source

Hall A.-J.,Drugs of Abuse Laboratory | Warner J.V.,Drugs of Abuse Laboratory | Henman M.G.,Drugs of Abuse Laboratory | Ferguson W.E.,Drugs of Abuse Laboratory
Journal of Analytical Toxicology | Year: 2015

In Australia, it is a requirement of workplace oral fluid (OF) drugs of abuse testing that drug recovery from collection devices be verified by an accredited laboratory. Recovery data are used in conjunction with collection volume imprecision data and uncertainty of measurement to provide an estimation of drug concentration in neat OF. The manufacturer's product information for the DCD5000 collection device indicates that the collection volume of the swab is 380 mL. Recovery data for the swab when used with the isopropanol provided by the manufacturer are not available. A series of experiments using fortified drug-free OF were performed to assess the collection volume imprecision of the Dräger DCD5000 swab and the recovery of drugs from the swab using isopropanol. The fortified OF was collected with the swabs (n 5 16), and swabs were discharged into vials of isopropanol as per the manufacturer's instructions. The mean collection volume of the DCD5000 swab was 487 μL with an imprecision of 1.3%. Recovery of drug from the device ranged from 86 to 98% for drugs listed in the Australian OF workplace testing standard. Recovery of methadone, buprenorphine and norbuprenorphine ranged from 93 to 102%. Recovery of 2-ethylidene-1,5-dimethyl-3,3-diphenylpyrrolidene was 45%, suggesting that urine is more suitable sample if methadone therapy is being monitored. Overall, drug recovery from the device using isopropanol was acceptable when the increased collection volume of the swab was taken into account. © The Author 2014. Source

De Jager A.D.,Drugs of Abuse Laboratory | Warner J.V.,Drugs of Abuse Laboratory | Henman M.,Drugs of Abuse Laboratory | Ferguson W.,Drugs of Abuse Laboratory | Hall A.,Drugs of Abuse Laboratory
Journal of Chromatography B: Analytical Technologies in the Biomedical and Life Sciences | Year: 2012

An LC-MS/MS method for the quantitation of urinary metabolites of eight JWH-type synthetic cannabinoids (SCs) has been developed and validated. Urine samples are subjected to deconjugation using β-glucuronidase, followed by a solvent extraction procedure. Compounds are separated on a reverse-phase HPLC column within a 14. min cycle. Low assay limits are required in order to demonstrate prior exposure to SCs. Matrix effects were studied and proved to be significant for selected analytes, and were challenging to circumvent as isotope-labeled internal standards are not available. An elimination profile from a naïve user following a single smoke of " Kronic" was constructed, showing urinary excretion over 2-3 days with peak concentrations of different metabolites 3-16.5. h after smoking. This method has been developed to process several hundred samples within a high-throughput drugs of abuse laboratory, with growing evidence that the use of synthetic cannabinoid blends is common within the Australian workforce. © 2012 Elsevier B.V. Source

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