monosaccharide


monosaccharide
/mon'euh sak"euh ruyd', -euhr id/, n. Chem.
a carbohydrate that does not hydrolyze, as glucose, fructose, or ribose, occurring naturally or obtained by the hydrolysis of glycosides or polysaccharides.
Also, monosaccharose /mon'euh sak"euh rohs'/.
[1895-1900; MONO- + SACCHARIDE]

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Any of the simple sugars that serve as building blocks for carbohydrates.

They are classified based on their backbone of carbon (C) atoms: Trioses have three carbon atoms, tetroses four, pentoses five, hexoses six, and heptoses seven. The carbon atoms are bonded to hydrogen atoms (―H), hydroxyl groups (―OH; see functional group), and carbonyl groups (―C=O), whose combinations, order, and configurations allow a large number of stereoisomers (see isomer) to exist. Pentoses include xylose, found in woody materials; arabinose, found in gums from conifers; ribose, a component of RNA and several vitamins; and deoxyribose, a component of DNA. Important hexoses include glucose, galactose, and fructose. Monosaccharides combine with each other and other groups to form a variety of disaccharides, polysaccharides, and other carbohydrates.

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also called  Simple Sugar,  

      any of the basic compounds that serve as the building blocks of carbohydrates. Monosaccharides are polyhydroxy aldehydes or ketones; that is, they are molecules with more than one hydroxyl group (−OH), and a carbonyl group (C=O) either at the terminal carbon atom (aldose) or at the second carbon atom (ketose). The carbonyl group combines in aqueous solution with one hydroxyl group to form a cyclic compound (hemi-acetal or hemi-ketal). Monosaccharides are classified by the number of carbon atoms in the molecule; trioses have three, tetroses four, pentoses five, hexoses six, and heptoses seven. Most contain five or six. The most important pentoses include xylose, found combined as xylan in woody materials; arabinose from coniferous trees; ribose, a component of ribonucleic acids and several vitamins; and deoxyribose, a component of deoxyribonucleic acid. Among the most important aldohexoses are glucose, mannose, and galactose; fructose is a ketohexose.

      Several derivatives of monosaccharides are important. Ascorbic acid (vitamin C) is derived from glucose. Important sugar alcohols (alditols), formed by the reduction of (i.e., addition of hydrogen to) a monosaccharide, include sorbitol (glucitol) from glucose and mannitol from mannose; both are used as sweetening agents. Glycosides derived from monosaccharides are widespread in nature, especially in plants. Amino sugars (i.e., sugars in which one or two hydroxyl groups are replaced with an amino group, −NH2) occur as components of glycolipids and in the chitin of arthropods.

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Universalium. 2010.

Look at other dictionaries:

  • Monosaccharide — Monosaccharide,   Gruppe von einfach gebauten Zuckern mit der allgemeinen Formel CnH2nOn, die als die Grundbausteine der Kohlenhydrate anzusehen sind und sich im Gegensatz zu den Di , Oligo und Polysacchariden nicht weiter hydrolytisch spalten… …   Universal-Lexikon

  • monosaccharide — [ mɔnɔsakarid ] n. m. • mil. XXe; de mono et saccharide ♦ Biochim. Sucre de formule CnH2nOn, non hydrolysable (opposé à polysaccharide).⇒ ose. ● monosaccharide nom masculin Glucide simple constitué d une seule molécule …   Encyclopédie Universelle

  • Monosaccharide — Mon o*sac cha*ride, n. Also rid rid . [Mono + saccharide.] (Chem.) A simple sugar; any of a number of sugars (including the trioses, tetroses, pentoses, hexoses, etc.), not decomposable into simpler sugars by hydrolysis. Specif., as used by some …   The Collaborative International Dictionary of English

  • Monosaccharide — (Monosen), s. Kohlehydrate …   Meyers Großes Konversations-Lexikon

  • Monosaccharide — Monosaccharide, s. Kohlehydrate …   Lexikon der gesamten Technik

  • Monosaccharide — Monosaccharide, Einfachzucker, Formel CnH2nOn, nach der Anzahl ihrer C Atome (Triosen, Tetrosen, Pentosen, Hexosen ...) klassifizierte Monomeren der ⇒ Kohlenhydrate; haben in den Organismen wichtige Funktionen als Speicherstoff (z.B. Glucose,… …   Deutsch wörterbuch der biologie

  • monosaccharide — ► NOUN ▪ a sugar (e.g. glucose) that cannot be broken down to give a simpler sugar …   English terms dictionary

  • monosaccharide — [män΄ō sak′ə rīd΄] n. [ MONO + SACCHARIDE] a carbohydrate, CxH2xOx, not decomposable by hydrolysis; esp., a hexose sugar, C6H12O6, as glucose, fructose, or galactose …   English World dictionary

  • Monosaccharide — Monosaccharides (from Greek monos: single, sacchar: sugar) are the most basic units of biologically important carbohydrates. They are the simplest form of sugar and are usually colorless, water soluble, crystalline solids. Some monosaccharides… …   Wikipedia

  • Monosaccharide — D und L Ribose in Fischer Projektion …   Deutsch Wikipedia


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