. 2011 Aug 2;2(4):e00142-11. doi: 10.1128/mBio.00142-11

TABLE 1 .

Observed masses and proposed compositions for truncated cores observed by ESI-MS

Strain	Proposed structure^b	Calculated m/z	Observed m/z^a
CDR0031 (WaaP-depleted)	[HexHep₂Kdo-H]⁻	783.24	783.2
	[HexHep₂anhydroKdo-H]⁻	765.23	765.2
	[GalN(Ala)Hep₂Kdo-H]⁻	853.29	853.3
	[GalN(Ala)Hep₂anhydroKdo-H]⁻	835.28	835.3
CDR0060 (WapP/WapQ/PA5006-depleted)	[HexHep₂Kdo-H]⁻	783.24	783.2
	[HexHep₂anhydroKdo-H]⁻	765.23	765.2
	[GalN(Ala)Hep(Cm)HepPKdo-H]⁻	976.27	976.3
	[GalN(Ala)Hep(Cm)HepPKdo-2H]²⁻	487.63	487.6^c
	[GalN(Ala)Hep(Cm)HepPanhydroKdo-H]⁻	958.26	958.3
	[GalN(Ala)Hep(Cm)HepPanhydroKdo-2H]²⁻	478.62	478.6^c
	[GalN(Ala)Hep(Cm)HepP₂Kdo-2H]²⁻	527.61	527.6
	[GalN(Ala)Hep(Cm)HepP₂anhydroKdo-2H]²⁻	518.61	518.6

^{^a}

Peaks identified by negative-ion ESI-MS with an m/z scan (60 to 2,200) were subject to enhanced-resolution ESI-MS to determine exact mass and charge state (data not shown).

Only assignable peaks with unambiguous exact masses and charge states are listed.

^{^b}

A second Kdo residue, which is cleaved as a result of acid hydrolysis during core preparation (35), would be present in the intact core.

^{^c}

Peaks observed by enhanced-resolution ESI-MS but not shown in Fig. S3C in the supplemental material.