Fig. 4 shows the complete 1H NMR spectrum of the tobacco liqueur. The figure depicts the intense signals of the sugars in the mid-field region, less intense signals of higher alcohols and comparatively small signals of aromatic compounds in the high-field region. As the principal goal was to control for the health-relevant compound nicotine, also measured was a nicotine standard solution of 100 mg/l under the same experimental conditions. In the spectrum of the standard solution, nicotine had resonances at δ 8.60 ppm (td), δ 8.00 ppm (q), δ 7.57 ppm (m), δ 3.36 ppm (s), δ 2.93 ppm (m), δ 2.48 ppm (s) and δ 2.15 ppm (d). However, none of them were found in the 1H NMR spectrum of the tobacco liqueur. Since the reason for this could potentially have been a matrix or solvent suppression effect, the 1H NMR spectra of the tobacco liqueur was measured with several standard additions of nicotine. All nicotine resonances were visible in this case. Furthermore, to calculate the LOD/LOQ values of nicotine for this particular matrix, it was decided to use the multiplet at δ 8.60 ppm for integration, because this lead to the largest sensitivity and the signal was not interfered by the matrix itself (as it was observed in the mid-field and high-field regions)