Table 1.
Mass measurement of MH+ and product ions from rat paw extract and structural assignments conducted with QqTOF LC/MS/MS
| Putative prostaglandin E2 glycerol ester (PGE2-G) | ||
|---|---|---|
| Common fragments m/z (p.p.m.)a | Proposed formulae | Proposed fragmentation |
| 444.2990 (7.7) | C23H42O7N | MH++NH3 |
| 427.2779 (20.7) | C23H39O7 | MH+ |
| 391.2492 (3.3) | C23H35O5 | MH+−2H2O |
| 373.2353 (−5.5) | C23H33O4 | MH+−3H2O |
| 317.2080 (−9.8) | C20H29O3 | MH+−C3H8O3−H2O |
| 299.2009 (1.1) | C20H27O2 | MH+−C3H8O3−2H2O |
| 281.1910 (3.6) | C20H25O | MH+−C3H8O3−3H2O |
Abbreviations: LC, liquid chromatography; MS, mass spectrometry; QqTOF, quadrupole time-of-flight.
a
Mass measurements and errors (p.p.m. difference from theoretical exact mass) of at least 10 consecutive scan averages.