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MALDI-MS/MS of dominant nonphosphorylated lipid A species (positive ions). The dominant nonphosphorylated lipid A species (m/z 1,406, 1,392, 1,378, and 1,364) were evaluated by MALDI-MS/MS. The product ions produced from these precursor ions are depicted for the mass range m/z 600 to 950 (left) and m/z 1,080 to 1,140 (right). Refer to Table 1 for the predicted fatty acid substitutions for these lipid A species as well as other nonphosphorylated lipid A species.
