DMABA NHS ester can chemically react with the primary amine groups of the major phospholipid component of the cell membrane, Phosphatidylethanolamine (PE). Through precursor ion scanning, all PE subclasses labeled with DMABA can be detected. DMABA NHS ester can be used in combination with isotope-labeled compounds such as DMABA-d6 NHS ester, DMABA-d10 NHS ester, and DMABA-d4 NHS ester to observe changes in the distribution of PE lipids and the formation of novel PE lipid products^[1].