Galactomannan spectrum

Fig. 11.—Circular Dichroism Spectrum for a Solid Film of Guar Galactomannan. (Redrawn from Ref. 24.)...

The structure of the galactomannan can be partly elucidated from its spectrum (22) since a minor 3-D-galactofuranose structure is indicated and the chemical shifts of the small signals at 6(.84.8, 82.5, 78.5 and 64.5 correspond to those of C-4, C-3 and C-5 of methyl 3-D-galactofuranoside (Fig. 12). The similarity in chemical shift shows that 2-0, 3- -, 5-0 - and 6- -substitution, if present, is minor and that the galactofuranose units exist mainly as single unit non-reducing ends and not consecutively. 

By virtue of its C-n.m.r. spectrum ), which contains a C-1 signal at 6(.109.4 (Fig. 6). a p— 6) galactose to mannose linkage is suggested. Other i3c signals corresponding to mannopyranosyl units are also similar to those of the schenckii galactomannan. 

Figure 9. C-/5 iVAfi spectrum of galactomannan of Ceratocystis stenoceras...

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