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MS and MS/MS analysis of intact LOS from C. jejuni MF6. A separation voltage of 20 kV, together with a pressure of 50 kPa, was employed. Samples (1.0 μl) were injected for all experiments. For MS/MS analysis, N2 was used as a collision gas and −40 V was set as the collision energy level. (A) Extracted MS/MS spectrum of the ion with an m/z of 1,126.9 ([M-4H]4−); (B) extracted MS/MS spectrum of the ion with an m/z of 1,137.0 ([M-4H]4−).
