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hemicellulose
chemical compound
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- homopolysaccharide
hemicellulose, any of a group of complex carbohydrates that, with other carbohydrates (e.g., pectins), surround thecellulose fibres of plant cells. The most common hemicelluloses contain xylans (many molecules of the five-carbon sugar xylose linked together), a uronicacid (i.e., sugar acid), and arabinose (another five-carbon sugar). Hemicelluloses have no chemical relationship to cellulose.