Table 3.
Fragmentation data obtained by negative ESI-MS/MS infusion experiments in daughter scans for the precursor ions assigned to pyruvic (Pyr ac), lactic (Lac ac), phosphoric (Pho ac), 2-furoic (Fur ac), fumaric (Fum ac), malic (Mal ac), cis-aconitic (cis-Aco ac) and citric (Cit ac) acids.
| Organic Acid |
Precursor [M-H]− (m/z) |
Fragments (m/z) |
Ref. |
|---|---|---|---|
| Pyr ac | 87 | 43 [M-H-CO2]− | [52] |
| Lac ac | 89 | 71 [M-H-H2O]−; 43 [M-H-HCO2H]− | [52] |
| Pho ac | 97 | 79 [M-H2O]− | [53] |
| Fur ac | 111 | 67 [M-H-CO2]−; 41 [M-H-CO2-C2H2]− | [54] |
| Fum ac | 115 | 71 [M-H-CO2]− | [55] |
| Mal ac | 133 | 115 [M-H-H2O]−; 89 [M-H-CO2]−; 71 [M-H-CO2-H2O]− |
[55] |
| cis-Aco ac | 173 | 111 [M-CO2-H2O]− | [56] |
| Cit ac | 191 | 129 [M-H-CO2-H2O]−; 111 [M-H-CO2-2H2O]− | [55] |