Table 1. Calculated and Observed Monoisotopic Molecular Weights of Oligonucleotides Observed in the Present Study.
| lesion or base (structures) | MW (calcd) of neutral species | calcd monoisotopic m/z (−4 charge) | obsvd monoisotopic m/z (−4 charge) |
|---|---|---|---|
| (1a)/(1b) | 4960.88 | 1239.21 | 1239.16 |
| 1239.19 | |||
| 1239.20 | |||
| (2)/(18) | 4942.87 | 1234.71 | 1234.68 |
| 1234.70 | |||
| (3a)/(3b)/(21) | 4976.88 | 1243.21 | 1243.17 |
| 1243.18 | |||
| 1243.24 | |||
| (4)/(20) | 4958.87 | 1238.71 | 1238.67 |
| 1238.68 | |||
| 1238.70 | |||
| (5a)/(5b) | 4960.88 | 1239.21 | 1239.23 |
| (6) | 4904.86 | 1225.21 | 1225.17 |
| 1225.19 | |||
| (7) | 4940.86 | 1234.21 | 1234.17 |
| 1234.19 | |||
| (8) | 4956.85 | 1238.20 | 1238.19 |
| 1238.24 | |||
| (9)/(13)/(14) | 4974.86 | 1242.71 | 1242.73 |
| 1242.69 | |||
| (10) | 4992.87 | 1247.21 | 1247.19 |
| 1247.25 | |||
| (11a)/(11b)/ (12a)/(12b) | 4958.87 | 1238.71 | not observed |
| (15) | 4944.89 | 1235.21 | 1235.16 |
| (16) | 4962.90 | 1239.72 | 1239.71 |
| (17) | 4978.89 | 1243.72 | 1243.71 |
| (19) | 4958.68 | 1239.67 | 1239.67 |