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pH measurements and percentages of Nic and NicH+ in standard nicotine solution assessed by the optimized extraction method. Results are compared to predicted values from pH measurement and pKa
| Sample (nicotine label) |
pH | % of predicted Nic/NicH+ |
% of measured Nic/NicH+ |
|---|---|---|---|
| STD(1) | 5.16 | 0.2/99.8 | 2.5/97.5 ± 0.09 |
| STD(2) | 7.52 | 24.0/76.0 | 27.8/72.2 ± 0.84 |
| STD(3) | 8.07 | 52.9/47.1 | 53.0/47.0 ± 1.43 |
| STD(4) | 8.55 | 72.2/22.8 | 79.2/20.8 ± 0.62 |
| STD(5) | 9.66 | 97.8/2.2 | 97.7/2.3 ± 0.27 |
