Constitution of Plant Cell Wall Polysaccharides
Plant polysaccharides associated with cellulose in the cell wall are commonly isolated using selective extraction procedures. The terms pectic substances, denoting those materials extracted with water alone or with hot aqueous solutions of chelating agents for calcium, such as disodium ethylenedinitrilotetraacetate or sodium hexametaphosphate, and hemicelluloses, denoting polysaccharides extracted with dilute alkali alone or with added borate, are useful in describing broad groups of polysaccharides. However, a more complete and precise classification based on structure is necessary to avoid the difficulties which arise when obviously related polysaccharides, differing in some small and apparently trivial feature such as extent of branching or degree of esterification, show marked differences in physical properties such as solubility.
KeywordsSugar Cellulose Polysaccharide Borate Hemicellulose
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