Figure 1
From: Stronger findings from mass spectral data through multi-peak modeling
A schematic of the positions of typical adduct peaks [7] in the RT-m/z plane for two lipids, the ceramide Cer(d18:1/17:0) and the sphingomyelin SM(d18:1/22:0). An adduct peak is formed by an ion attaching to the compound. At the finer detail, each peak in the figure consists of multiple isotope peaks few atomic units apart, as shown for Cer(d18:1/17:0) in Figure 2. Even though the distinct isotope peaks are not visible to the eye here, they are clearly separable by the mass spectrometer. In the figure, adduct types and compounds are marked by colors and characters, respectively.