Determination of gamma-hydroxybutyric acid in dried blood spots using a simple GC-MS method with direct “on spot” derivatization |
| |
Authors: | Ann-Sofie M E Ingels Willy E Lambert Christophe P Stove |
| |
Institution: | (1) Laboratory of Toxicology, Faculty of Pharmaceutical Sciences, Ghent University, Harelbekestraat 72, 9000 Ghent, Belgium; |
| |
Abstract: | The objective of this study was the development of an accurate and sensitive method for the determination of gamma-hydroxybutyric
acid (GHB) in dried whole blood samples using a GC-MS method. The complete procedure was optimized, with special attention
on the sample pretreatment, and validated. Therefore, dried blood spots of only 50 μl were prepared and, after the addition
of internal standard GHB-d6, directly derivatized using 100 μl of a freshly prepared mixture of trifluoroacetic acid anhydride
and heptafluorobutanol (2:1). The derivatized extract was injected into a gas chromatograph coupled to a mass spectrometer
(GC-MS), operating in the electron impact mode, with a total run time of 12.3 min. Method validation included the evaluation
of linearity, precision, accuracy, sensitivity, selectivity, and stability. A weighting factor of 1/x
2 was chosen and acceptable intra-batch precision, inter-batch precision, and accuracy were seen. The linear calibration curve
ranged from 2 to 100 μg/ml, with a limit of detection of 1 μg/ml. Our procedure, utilizing the novel approach of direct “on
spot” derivatization followed by analysis with GC-MS, proved to be reliable, fast, and applicable in routine toxicology. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|