TY  - JOUR
PY  - 2022//
TI  - Stability of drugs of abuse in synthetic oral fluid investigated using a simple "dilute and inject" method of analysis
JO  - Drug testing and analysis
A1  - Gavrilović, Ivana
A1  - Musenga, Alessandro
A1  - Wolff, Kim
A1  - Woffendin, Alison
A1  - Smart, Andrew
A1  - Gong, Fan
A1  - Harding, Duncan
A1  - Cowan, David
SP  - ePub
EP  - ePub
VL  - ePub
IS  - ePub
N2  - Human oral fluid is well established as a matrix for drug screening, particularly in the workplace. The need to synthesise synthetic oral fluid (SOF) has been recognised in order to overcome human oral fluid's composition variability. We have used SOF spiked with six common drugs of abuse or their primary metabolites: morphine, amfetamine, benzoylecgonine, cocaine, diazepam, and (-)-Δ(9) -tetrahydrocannabinol (THC) in order to assess the suitability of this matrix for quality assurance purposes. For confirmation of a drug screening test, controls and spiked standards are normally required. All our analytes were detected by LC-MS/MS using a quick and easy "dilute and inject" sample preparation approach as opposed to relatively slower solid-phase extraction. The limit of detection (LOD) was 10 ng/mL for diazepam and THC, and 5 ng/mL for morphine, amfetamine, benzoylecgonine and cocaine. Validation results showed good accuracy as well as inter- and intra-assay precision (CV (%) <5). Our work highlighted the importance of adding Tween® 20 to the SOF and calibrants to reduce losses when handling THC. Furthermore, drug stability was tested at various temperatures (5 °C, 20 °C and 40 °C), for a number of days or after freeze-thaw cycles. Recommendations regarding storage are provided, the spiked SOF being stable at 5 °C for up to one week without significant drug concentration loss.<p />  <p>Language: en</p>
LA  - en
SN  - 1942-7603
UR  - http://dx.doi.org/10.1002/dta.3279
ID  - ref1
ER  -