Galactoglucomannans, isolation

It was pointed out that direct attachment of the D-galactose residues to the hexosan framework is only one possibility. It was observed that the D-galactosidic linkage is quite labile to acids. Polysaccharides of similar composition were isolated from western hemlock and redwood Sequoia sempervirens), and it was suggested that water-soluble galactoglucomannans may be of general occurrence in softwoods. 

Somewhat later, a general method for isolating galactoglucomannans... 

The sample of galactoglucomannan previously isolated from a pine kraft pulp by Hamilton and coworkers has been subjected to light-... 

All of the major polysaccharides in softwoods are now known these are cellulose, galactoglucomannans, arabino-(4-0-methylglucurono)xylan, ara-binogalactan, galactan, pectic material, and starch. It is clear, however, that other minor polysaccharide constituents, still unknown, must also be present. These polysaccharides have not yet been isolated, but their presence may be inferred from the formation of di- and tri-saccharides of unknown origin on partial hydrolysis of wood or crude hemicellulose preparations. 

Isolation, Characterization, and Enzymatic Hydrolysis of Acetyl-Galactoglucomannan from Spruce (Picea abies)... 

Lundqvist, J. Teleman, A. Junel, L. Zacchi, G. Dahlman, O. Tjemeld, F. St lbrand, H. Isolation and characterization of galactoglucomannan from spruce Picea abies). Carbohydr. Polymers, 2002,48,281-289. 

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