Research Article
Spectroscopic Characterization of Omeprazole and Its Salts
Table 1
Carbon chemical shifts (ppm) of OMP and its salts.
| C atom | OMP | OMP-Na | OMP-K | OMP-Li | OMP-Mg | OMP-Ca |
| C15 | 8.96 | 10.43 | 11.79 | 11.61 | 11.90 | 11.09 |
| C16 | 12.60 | 12.34 | 13.34 | 14.40 | 13.00 | 13.54 |
| C8, C17, C18 | 57.81 | 53.75 | 52.78 | 53.35 | 52.55 | 52.39 | | — | 58.48 | 59.22 | 60.23 | 58.79 | 54.71 | | — | 60.74 | — | — | — | 60.05 | | — | — | — | — | — | 61.79 |
| C7 | 92.02 | 99.02 | 98.40 | 97.16 | 97.21 | 96.59 | | — | — | — | — | — | 98.67 |
| C5 | 112.94 | 111.31 | 108.39 | 113.21 | 109.31 | 110.29 | | | 114.60 | 117.08 | 117.53 | 116.78 | 111.70 |
| C4 | 121.85 | 125.11 | 124.32 | 126.82 | 124.44 | 116.60 |
| C10, C12 | 126.00 | 127.41 | 126.94 | 129.49 | 127.95 | 125.82 | | — | — | — | — | — | 127.56 | | — | — | — | — | — | 128.98 |
| C3a–C7a | 136.00 | 139.30 | 139.41 | 139.62 | 137.20 | 137.67 | | | | | | | 139.44 |
| C9–C13 | 150.13 | 147.33 | 146.42 | 147.18 | 141.85 | 144.56 | | — | 150.71 | 149.02 | — | 147.15 | 146.59 | | — | 154.30 | 150.59 | — | 149.46 | 147.78 | | — | — | — | — | — | 149.47 | | — | — | — | — | — | 151.29 |
| C2–C6 | 158.05 | 158.24 | 153.32 | 155.48 | 153.66 | 153.63 | | — | — | — | 157.18 | 156.59 | 157.868 |
| C11 | 164.41 | 164.51 | 163.05 | 165.29 | 164.01 | 159.90 | | — | — | 164.12 | — | — | 164.22 |
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