Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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hemicelluloses

Any of several cell wall polysaccharides present in almost all vegetable fibers. Although impervious to water and almost all natural organic solvents, they may be removed gradually by means of aqueous alkalis. They are hydrolized to simple sugars, uronic acids and acetic acid when heated with dilute acids. Their molecular weights are usually lower than those of various celluloses. The presence of hemicelluloses in paper improves its bonding and folding characteristics. (17 , 72 , 235 )




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