Abstract

This chapter presents the chemistry of carbohydrates that is important to the understanding of cellulose and hemicelluloses during pulping and papermaking. Carbohydrates can be polyhydroxy aldehydes or polyhydroxy ketones, occurring in their open chain forms or in their heterocyclic ring forms. The monosaccharides, simple sugars that cannot be easily hydrolyzed into smaller units, are classified according to the number of carbon atoms in the molecule. This classification is used for carbohydrates with three to seven carbon atoms; that is, with trioses, tetroses, pentoses, hexoses, and heptoses. Monosaccharide constituents of particular importance in woody plant cell wall polysaccharides are the pentoses arabinose and xylose; the hexoses glucose, mannose, and galactose; and the uronic acid (4-0-methyl) glucuronic acid.

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