TABLE 2.

Structural interpretations of lipid A species detected by mass spectrometry

m/zLipid A modification(s)a
1571Deacylation
1587, 1588Deacylation and hydroxylation
1798Unmodified
1810Deacylation and palmitoylation
1814Hydroxylation
1826Deacylation, palmitoylation, and hydroxylation
1945l-Ara4N attachment and hydroxylation
2036Palmitoylation
2052Palmitoylation and hydroxylation
2184Palmitoylation, l-Ara4N attachment, and hydroxylation
  • a Interpretations were based on previous work (11, 14, 39, 43).