Table 1.
LC-MS/MS parameters of each analyte.
| Analyte | Retention time (min) | Precursor ion (m/z) | Product ion (m/z) | Collision energy | Cell accelerator voltage | Polarity |
|---|---|---|---|---|---|---|
| D4-citric acid | 1.13 | 195 | 114 | 12 | 4 | Negative |
| D4-citric acid | 1.13 | 195 | 177 | 10 | 4 | Negative |
| Isocitric acid | 0.85 | 191 | 155 | 10 | 5 | Negative |
| Citric acid | 1.13 | 191 | 111 | 10 | 5 | Negative |
| Citric acid | 1.13 | 191 | 87 | 18 | 5 | Negative |
| Glutamic acid | 0.6 | 148 | 130 | 8 | 4 | Positive |
| Glutamic acid | 0.6 | 148 | 84 | 12 | 4 | Positive |
| Malic acid | 0.7 | 133 | 115 | 10 | 5 | Negative |
| Malic acid | 0.7 | 133 | 71 | 14 | 5 | Negative |
| Succinic acid | 1.6 | 117 | 99 | 10 | 5 | Negative |
| Succinic acid | 1.6 | 117 | 73 | 10 | 5 | Negative |
| Fumaric acid | 1.3 | 115 | 71 | 10 | 5 | Negative |
| Fumaric acid | 1.3 | 115 | 41 | 18 | 5 | Negative |
| Lactic acid | 1.05 | 89 | 43 | 10 | 4 | Negative |
| α-Ketoglutaric acid | 1.03 | 145 | 101 | 10 | 5 | Negative |
| α-Ketoglutaric acid | 1.03 | 145 | 57 | 10 | 5 | Negative |
| Oxaloacetic acid | 0.58 | 131 | 87 | 10 | 5 | Negative |
| Oxaloacetic acid | 0.58 | 131 | 41 | 54 | 5 | Negative |