Table 3
Intensity of m/z peaks of isomers of amino acids and nucleobases identified in residues in the range 50–300 m/z in ESI negative mode.
| Stoichiometric formula | m/z peaks intensity | ||
|---|---|---|---|
| 1:1:1 + 29 eV/16 u | 3:1:1 + 67eV/16 u | 1:1:1 + 98 eV/16 u | |
| C6H9N3O2 | 0.24 | 0.43 | 5.8 |
| C5H10N2O3 | 0.42 | 0.60 | 3.73 |
| C4H9NO3 | 0.41 | 0.52 | 3.27 |
| C5H9NO2 | 0.44 | 0.28 | 2.03 |
| C4H9NO2 | 0.12 | 0.13 | 1.51 |
| C3H7NO2 | 0.22 | 0.27 | 3.16 |
| C2H5NO2 | 0.12 | 0.38 | 2.89 |
| C5H6N2O2 | 1.07 | 1.30 | 14.63 |
| C4H5N3O | 0.11 | 0.35 | 3.31 |
| C4H4N2O2 | 0.23 | 0.57 | 5.91 |
Notes. Intensities are normalized to the most intense peak in m/z spectra acquired in the range 50–300 m/z in ESI negative mode, that is, 105.019 m/z is assigned to C3 H5O
. Isomers of (from top to bottom): histidine, glutamine, threonine, proline, aminoisobutanoic acid, alanine, glycine, thymine, cytosine, and uracil.
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