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. 2022 Aug 5;39(5):565–578. doi: 10.1007/s10719-022-10076-6

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Fig. 4 — Reflectron MALDI-TOF MS spectra, recorded in negative-ion polarity, of LipA_me (a), LipA_ah (b), and bacterial pellet (UCF_prec) (c). Lipid A species are labelled as Tetra LipA and Penta LipA on the basis of the degree of acylation. Differences of 14 amu, diagnostic for a methylene group, are also reported in the spectra.“EtN” indicates the 2-aminoethyl decoration on the mono-phosphorylated disaccharide backbone of the lipid A