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Table 4 Intensities of GC/MS peaks in C2-C4 fragment of glutamate for various commercially available isotopomers

From: MIDcor, an R-program for deciphering mass interferences in mass spectra of metabolites enriched in stable isotopes

m/z 151 152 153 154 155 156 157 158 159
natural 6293 712362 110422 12185 1821 3166 528 8002 877
Q3-13C 1562 10455 652415 63645 8745 1225 2767 386 4340
QU-13C 315 2406 3923 24427 833038 64103 9910 838 484
  1. Here “Q3-13C” states for the sample where only one 13C is introduced in position 3, and “QU-13C” states for uniformly 13C labeled sample