The homogeneity testing of EtG in hair reference materials: A high-throughput procedure using GC–NCI–MS  Bettina Mönch, Roland Becker, Christian Jung,

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Presentation transcript:

The homogeneity testing of EtG in hair reference materials: A high-throughput procedure using GC–NCI–MS  Bettina Mönch, Roland Becker, Christian Jung, Irene Nehls  Forensic Science International  Volume 226, Issue 1, Pages 202-207 (March 2013) DOI: 10.1016/j.forsciint.2013.01.018 Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions

Fig. 1 Optimization of time and temperature of the derivatization reaction of EtG with PFPA. Forensic Science International 2013 226, 202-207DOI: (10.1016/j.forsciint.2013.01.018) Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions

Fig. 2 Gas chromatograms of materials 1 and 2 after extraction and derivatization with PFPA. SIM mode, mass traces m/z 496 (EtG derivative) and m/z 501 (EtG-d5 derivative). Forensic Science International 2013 226, 202-207DOI: (10.1016/j.forsciint.2013.01.018) Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions

Fig. 3 Recovery of EtG from aqueous hair extracts after prolonged storage at −26°C (p=3 injections). Forensic Science International 2013 226, 202-207DOI: (10.1016/j.forsciint.2013.01.018) Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions

Fig. 4 Stability of the EtG derivative stored at 9°C for different times. On each day four separate derivatizations of a pooled extract were analyzed (p=3 injections). Forensic Science International 2013 226, 202-207DOI: (10.1016/j.forsciint.2013.01.018) Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions

Fig. 5 Result of the homogeneity study using the validated method on hair reference material 2. Bottle means and standard deviations (p=2 subsamples analyzed, each derivatized extract injected n=3 times). Forensic Science International 2013 226, 202-207DOI: (10.1016/j.forsciint.2013.01.018) Copyright © 2013 Elsevier Ireland Ltd Terms and Conditions

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