SAMPLE PREP./SIZE PYR0L. CONDITIONS TOTAL ION COUNTS
CAPSULAR POLYSACCHARIDE (from Neisseria meningitidis, Group 29E)
poly[(2+3)£GalNAca(l+7)KD0e]; see insert in spectrum gift from Dr. E.C. Beuvery, Natl. Inst. Publ. Health, Bilthoven, The Netherlands suspension in methanol; 10 yg standard
REMARKS - Sample prepared following ref. 49. Ion series at m/z 59, 73, 95, 97, 109 and 125 are characteristic of hexNAc residues (see Spectrum A.13). The peaks at m/z 110, 112, 122 are indicative of the KDO (ketodeoxyoctonate) residues (see Spectrum A.21) but are much more pronounced in a phosphate buffer environment (compare with Spectrum A.20a).
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