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LC-UVPD-MS of lipooligosaccharides from E. coli BN1 culture. A) LC-MS trace of identified E. coli BN1 LOS (top left), and B) survey mass spectra of the identified LOS (bottom left). C) The UVPD/HCD mass spectrum of hexa-acylated waaOwaaQ + PPEtN (3−) [Mr = 3148.5 Da] is shown on the bottom left and the accompanying fragmentation cleavage map is shown on the bottom right. “TA” is an abbreviation for tetra-acyl and “PA” is an abbreviation for penta-acyl.
