Table 1 Selected resonances, limits of detection (LOD) and limits of quantification (LOQ) for compounds in e-cigarette liquids
From: Electronic cigarettes: overview of chemical composition and exposure estimation
Substance | Solvent | NMR range used for integration [ppm] | LOD [mg/L] | LOQ [mg/L] | |
|---|---|---|---|---|---|
1 | Nicotine | Water | 8.68-8.60 (multiplet) | 1.6 | 5.5 |
2 | Propylene glycol (1,2-propanediol) | 3.47-3.42 (multiplet) | 2.1 | 6.9 | |
3 | 1,3-Butanediol | 1.75-1.70 (multiplet) | 2.3 | 7.6 | |
4 | 1,3-Propanediol | 1.85-1.75 (multiplet) | 0.96 | 3.2 | |
5 | Ethylene glycol | 3.69-3.67 (singlet) | 0.17 | 0.56 | |
6 | Diethylene glycol | 3.78-3.73 (multiplet) | 0.51 | 1.7 | |
7 | Glycerol | 3.82-3.75 (multiplet) | 2.6 | 8.7 | |
8 | Menthol | Chloroform | 2.00-1.92 (multiplet) | 12 | 40 |
9 | Ethyl vanillin | 9.81-9.83 (singlet) | 1.0 | 3.4 | |
10 | Coumarin | 7.80-7.65 (multiplet) | 3.2 | 10 | |
11 | Camphor | 2.40-2.30 (multiplet) | 13 | 44 | |
12 | Safrole | 6.80-6.60 (multiplet) | 2.6 | 8.6 | |
13 | Thujone (sum of α- and β-diastereomers) | 2.12-2.09 (singlet) | 3.4 | 11 |