Figure 6.
Comparison of MS/MS spectra of the fully 13C labeled form of C29H42O7 [M + H]+ ion at m/z 532.3976 (shown in blue) with the corresponding isotopolog carrying six tracer-derived extension units in the metabolite (shown in red). Peaks with corresponding m/z shifts are marked with black dots in the monoisotopic spectrum and as colored dots in the tracer containing isotopolog, indicating the number of tracer-derived extention units (from 6 to 3 extension units, marked as black (6), red (5), green (4) and blue (3), respectively). A single fragment of identical mass not showing a mass shift is marked in magenta. Numbers in brackets indicate the respective peak assignment.