3,5-Glucopyranosyl residues

A. Characterization of Branched Glucans Many branched (l- 3)-6-D-glucans were isolated from cell wall of fungi and formed rather soft gels in aqueous media. Figure 11 shows C NMR spectra of lentinan (, ) from Lentinus edodes, A3 (5.,1Z) from Pleurotus ostreatus, and schizophylIan (4g) from Schizophyllum commune, taken in DMSO solution. Those are known to have branches for every 3-5 glucopyranosyl residues at 0-6. The side-chains are... 

Structure of xanthan has been determined by chemical degradation and methylation analysis (335,336) it is composed of repeating units consisting of a main chain of D-glucopyranosyl residues with trisaccharide side chains made up of D-mannopyranosyl and D-glucopyranosyluronic acid residues. 

A number of amide- and ester-linked fatty acids and (/ )-3-hydroxy acids are components of the lipid A part in the LPS from Gram-negative bacteria. The acids have been tabulatedand the chemistry of lipid A summarized. The most common acids in lipid A from Enterobacteriaceae are the saturated 12 0,14 0, and 16 0, and the (/ )-3-hydroxy-14 0, The last is linked to N-2 and 0-3 of the 2-amino-2-deoxy-D-glucopyranosyl residues, and the others are ester-linked to the hydroxy acid, as in the lipid A (44) of Salmonella minnesota. Other linear and branched fatty acids, unsaturated acids, S)-2- and (/ )-3-hydroxy acids, and 3-oxotetradecanoic acid are components of lipid A from certain different species. In the lipid A from Rhizobium trifolii, 2,7-dihydroxyoctanoic acid is linked as amide to a 2-amino-2-deoxy-D-gl ucopy ranosy 1 residue. ... 

Similar reasoning (see Table IX) showed that the structure of the non-O-acetylated polysaccharide of Neisseria meningitidis serogroup W135 (for its 13C-n.m.r. spectrum, see Fig. 35,C) is closely related, containing D-galactopyranosyl in place of D-glucopyranosyl residues (in 33). 

As shown in Table I, the space within the cyclodextrin cavity increases with the number of D-glucopyranosyl residues. Thus, as would be expected, the stability of an inclusion complex depends to a large degree on... 

Where represents a glucopyranosyl residue attached to another... 

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