carbohydrate Any member of the class of organooxygen compounds that is a polyhydroxy-aldehyde or -ketone or a lactol resulting from their intramolecular condensation (monosaccharides); substances derived from these by reduction of the carbonyl group (alditols), by oxidation of one or more hydroxy groups to afford the corresponding aldehydes, ketones, or carboxylic acids, or by replacement of one or more hydroxy group(s) by a hydrogen atom; and polymeric products arising by intermolecular acetal formation between two or more such molecules (disaccharides, polysaccharides and oligosaccharides). Carbohydrates contain only carbon, hydrogen and oxygen atoms; prior to any oxidation or reduction, most have the empirical formula Cm(H2O)n. Compounds obtained from carbohydrates by substitution, etc., are known as carbohydrate derivatives and may contain other elements. Cyclitols are generally not regarded as carbohydrates. CHEBI:15131 CHEBI:16646 CHEBI:23008 CHEBI:9318 Kohlenhydrat Kohlenhydrate Wikipedia:Carbohydrate carbohidrato carbohidratos carbohydrate carbohydrates chebi_ontology glucide glucides glucido glucidos hydrates de carbone saccharide saccharides saccharidum organooxygen compound carbohydrates and carbohydrate derivatives