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. Author manuscript; available in PMC: 2008 Mar 17.
Published in final edited form as: Anal Chem. 2005 Oct 1;77(19):6435–6444. doi: 10.1021/ac0509354

Figure 4.

Figure 4

Mass spectra of the bis-butylboronate acetyl derivative of unlabeled (panel A) and [U-13C]glucose (panel B) obtained by electron impact ionization GCMS. The presented spectra are focused on the [M-57]+ ion (defined as M for each isotopomer) and its naturally occurring isotope ions for each isotopomer. Intensities are shown as relative abundance for each ion relative to the base mass M of each isotopomer. The numerical values for the x-axis are the measured m/z values. The figure represents the data obtained from Experiment 3.