Table 1. Negative ion electrospray tandem mass spectrometry and retention time (Rt) parameters for thyroacetic acids and internal standards.
| Compound | Rt (min) | PI (m/z) | Pro 1 (m/z) | Pro 2 (m/z) | DP (V) | CE (V) | CXP (V) |
|---|---|---|---|---|---|---|---|
| 2H4-T0Ac | 4.71 | 247.0 | 203.1 | 105.9 | -15 | -14 (-26) | -9 (-5) |
| 2H4-T1Ac | 5.15 | 372.9 | 329.0 | 126.8 | -5 | -8 (-16) | -15 (-13) |
| T0Ac | 4.72 | 243.0 | 198.9 | 106 | -10 | -12 (-24) | -9 (-5) |
| 3-T1Ac | 5.16 | 369.0 | 324.9 | 126.7 | -15 | -8 (-26) | -13 (-19) |
PI: precursor ion; Pro 1: quantifier product ion; Pro 2: confirmation product ion; DP: declustering potential; CE: collision energy; m/z: mass to charge ratio; CXP: collision exit potential; V: volts. Values in parentheses refer to Pro 2.