Cathinone preservation in khat evidence via drying John S. Chappell, Marsha M. Lee  Forensic Science International  Volume 195, Issue 1, Pages 108-120 (February 2010) DOI: 10.1016/j.forsciint.2009.12.002 Copyright © 2009 Terms and Conditions

Fig. 1 The molecular structures illustrated for the khatamines. Forensic Science International 2010 195, 108-120DOI: (10.1016/j.forsciint.2009.12.002) Copyright © 2009 Terms and Conditions

Fig. 2 The liquid chromatograms illustrated for an extract of khat A1. The UV absorbance at 200nm (top) and 250nm (bottom) are displayed. Forensic Science International 2010 195, 108-120DOI: (10.1016/j.forsciint.2009.12.002) Copyright © 2009 Terms and Conditions

Fig. 3 The khatamine concentrations for khat A1 are plotted as a function of the elapsed time from the start of the study. The solid line represents the least-squares linear regression for the data points (−). The parenthetical notation cites the slope of the linear regression followed by the correlation coefficient (r). Forensic Science International 2010 195, 108-120DOI: (10.1016/j.forsciint.2009.12.002) Copyright © 2009 Terms and Conditions

Fig. 4 The total ion chromatogram presented by an extract of khat A1 (prepared 1164 days into study). An expanded view of the chromatogram illustrates the relevant peaks. Forensic Science International 2010 195, 108-120DOI: (10.1016/j.forsciint.2009.12.002) Copyright © 2009 Terms and Conditions

Fig. 5 The mass spectrum collected from the cathinone peak of the total ion chromatogram (Fig. 4) of an extract of khat A1. The mass spectrum of a cathinone standard is shown for comparison. Forensic Science International 2010 195, 108-120DOI: (10.1016/j.forsciint.2009.12.002) Copyright © 2009 Terms and Conditions

Fig. 6 The mass spectrum collected from the cathine peak of the total ion chromatogram (Fig. 4) of an extract of khat A1. The mass spectrum of a cathine standard is shown for comparison. Forensic Science International 2010 195, 108-120DOI: (10.1016/j.forsciint.2009.12.002) Copyright © 2009 Terms and Conditions

Fig. 7 The total (infrared) response chromatogram presented for the same extract of khat A1 depicted in Fig. 4. An expanded view of the chromatogram illustrates the relevant peaks. Forensic Science International 2010 195, 108-120DOI: (10.1016/j.forsciint.2009.12.002) Copyright © 2009 Terms and Conditions

Fig. 8 The vapor-phase infrared transmission spectrum collected from the cathinone peak of the total response chromatogram (Fig. 7) of an extract of khat A1. The vapor-phase spectrum of a cathinone standard is shown for comparison. Spectra collected at 280°C and at 8cm−1 resolution. Forensic Science International 2010 195, 108-120DOI: (10.1016/j.forsciint.2009.12.002) Copyright © 2009 Terms and Conditions

Fig. 9 The vapor-phase infrared transmission spectrum collected from the cathine peak of the total response chromatogram (Fig. 7) of an extract of khat A1. The vapor-phase spectrum of a cathine standard is shown for comparison. Spectra collected at 280°C and at 8cm−1 resolution. Forensic Science International 2010 195, 108-120DOI: (10.1016/j.forsciint.2009.12.002) Copyright © 2009 Terms and Conditions

Fig. 10 The khatamine concentrations for khat B are plotted as a function of the elapsed time after drying in a fume hood (approximately 20°C) for 72h. The solid line represents the least-squares linear regression for the data points (−). The parenthetical notation cites the slope of the linear regression followed by the correlation coefficient (r). Forensic Science International 2010 195, 108-120DOI: (10.1016/j.forsciint.2009.12.002) Copyright © 2009 Terms and Conditions