Sialic acids various other derivatives

Signal assignment in the proton noise-decoupled spectra of the various polysaccharides was made on the basis of comparison with each other and with appropriate sialic acids and hexose derivatives as model compounds. i C-NMR spectral data of the various polymers and relevant model compounds are compiled in Table 12. The meningococcal serogroup B polysaccharide shows a simple spectrum (see Fig. Aa) consisting of 11 singlets (Bhattacharjee / al. 1975). This... 

IH). Apparently a nonose structure as indicated above or some other combination, possibly glycosidic, of these components can be given for the various sialic-neuraminic acids and derivatives. These appear to differ in the number and type of acylating groups and in the presence of esters and acetal methyl groups. 

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