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Negative ion ESI-FT-MS of LPS from the lgtB−pagL+ mutant of N. meningitidis after mild alkaline hydrolysis. The triply charged [M − 3H]3− molecular ion regions of the mass spectra of untreated LPS (A), LPS that had been incubated in neutral 5% TEA at RT for 3 h (B), and LPS that had been incubated in 5% alkaline triethylamine at 45 °C for 3 h (C) are presented. LPS composition proposals are shown in Table 3. The charge state of annotated molecular ions is z = 3.
