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. Author manuscript; available in PMC: 2017 Apr 5.
Published in final edited form as: Anal Chem. 2016 Mar 14;88(7):3440–3443. doi: 10.1021/acs.analchem.6b00041

Figure 2.

Figure 2

a) EIM ([M + Na]+, m/z 926.4567) of a mixture of permethylated LNT and LNnT. ΔV was scanned from 175 V to 145 V over 120 steps. b) EED spectra of the SA-TIMS-isolated isomer 1 (top) and isomer 2 (bottom). The insets show zoomed-in views of diagnostic peaks (1,3A2 ion for LNT and 3,5A2 ion for LNnT). ΔV was fixed at 168.0 V for isomer 1 and at 162.5 V for isomer 2. c) EIMs of the diagnostic fragment ions during a SA-TIMS-EED MS/MS analysis. ΔV was scanned from 175 V to 155 V over 40 steps. For all analyses, the gas pressure inside the TIMS funnel was 2.52 mBar.