Table 3 Principal positive ions that increase during aging. Retention time, measured m/z, calculated m/z, postulated identity, and elemental composition of positive ions that increase during aging.
Retention time (min) | Measured m/z (Da) | Calculated m/z (Da) | Postulated identity (with tR of standard) | Elemental composition of [M+H] ion |
|---|---|---|---|---|
2.14 | 212.1061 | 212.0324 | Kynurenic acid Na | C10H7NO3Na |
2.25 | 231.1701 | 231.1695 | Â | C9H21N5O2 |
5.83 | 180.0659 | 180.0661 | Hippuric acid (5.83) | C9H10NO3 |