List of MRM transitions.

The list was established from PC, PI and PE enhanced resolution mass spectra. From the spectra the molecular species can be deduced as “carbon number:double bond”. The detailed fatty acid composition of the molecular species consistent with carbon number:double-bond formula can be assayed by transitions parent → product ions after CID of the ester bonds. In bold: m/z detected for PE, PC and PI by enhanced-resolution mass scanning. Underlined: transitions detected by product ion analysis. For PE and PI the parent ions m/z correspond to the [M−H]− and for PC it corresponds to [M+HCOO]−. In agreement with formula a difference of 2 amu is noted between m/z of PE MRM (negative ionization M−H) and neutral loss of m/z 141 (positive ionization M+H).