Table 1.
Observed TiO2 Photocatalyzed Oxidation Products of Verapamil, as Generated on TiO2-Coated Glass Slides, Together with Their CID Product Ions. A Background-Subtracted Mass Spectrum Is Given in Figure S2a and CID MS/MS Spectra of Verapamil and Photocatalyzed Oxidation Products Are Provided in Figure S3
| Photocatalytic oxidation product | [M+H]+ | Observed CID MS/MS product ions (m/z) | |||||
|---|---|---|---|---|---|---|---|
| A | B | C | D | E | Other | ||
| Verapamil | 455.290 | 150.068 | 165.091 | 303.206 | 260.165 | ||
| M-164, N-dealkylation | 291.206 | 260.165 | 248.152 177.091 165.091 151.076 |
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| M-CH2 | 441.270 | 150.068 | 165.092 151.076 |
303.207 289.192 |
291.207 | 260.165 | |
| M+2O | 487.282 | 165.092 | 303.208 289.192 |
260.165 | 469.270 440.267 |
||
| M+O-H2 | 469.266 | 179.070 165.091 151.076 |
303.207 317.187 |
260.166 | |||
Proposed CID fragmentation pattern of verapamil |
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