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fructose

fructose (frŭk´tōs), levulose (lĕv´yəlōs´), or fruit sugar, simple sugar found in honey and in the fruit and other parts of plants. It is much sweeter than sucrose (cane sugar). It is best obtained by hydrolysis of inulin, a polysaccharide found in dahlia bulbs and the Jerusalem artichoke. Chemically it is a monosaccharide (see carbohydrate) with the empirical formula C6H12O6. It has the same formula as glucose but differs from it in structure (see isomer). It is often found with glucose in nature. Glucose and fructose are formed in equal amounts when sucrose is hydrolyzed by the enzyme invertase or by heating with dilute acid; the resulting equimolar mixture of fructose and glucose, called invert sugar, is the major component of honey. Fructose reacts with Fehling's solution and can be differentiated from glucose by its reaction with lime water to form a water-insoluble precipitate, calcium fructosate. In solution, fructose exists as a ring compound in equilibrium with a straight-chain form.

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fructose

fructose Also known as fruit sugar or laevulose. A six‐carbon monosaccharide sugar (hexose) differing from glucose in containing a ketone group (on carbon‐2) instead of an aldehyde group (on carbon‐1). Found as the free sugar in fruits and honey, and as a constituent of the disaccharide sucrose (together with glucose). It is 1.7 times as sweet as sucrose. Commercially prepared by the hydrolysis of the polysaccharide inulin from the Jerusalem artichoke. See also invert sugar.

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fructose

fructose (fruit sugar; laevulose) A simple sugar, C6H12O6, stereoisomeric with glucose (see monosaccharide). (Although natural fructose is the D-form, it is in fact laevorotatory.) Fructose occurs in green plants, fruits, and honey and tastes sweeter than sucrose (cane sugar), of which it is a constituent. Derivatives of fructose are important in the energy metabolism of living organisms. Some polysaccharide derivatives (fructans) are carbohydrate energy stores in certain plants.

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fructose

fructose (fruit sugar, C6H1206) Simple white monosaccharide, found in honey, sweet fruits, and flower nectar. Sweeter than sucrose, it is made commercially by the hydrolysis of beet or cane sugar, and is used in foods as a sweetener. Its derivatives play a crucial role in providing energy for organisms.

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fructose

fruc·tose / ˈfrəkˌtōs; ˈfroŏk-; -ˌtōz/ • n. Chem. a hexose sugar found esp. in honey and fruit.

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fructose

fructose (D-fructose, levulose, C6H12O6) A sugar that occurs abundantly in nature as the free form; but also, with glucose, in the form of the disaccharide sucrose.

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fructose

fructose (D-fructose, levulose, C6H12O6) A sugar that occurs abundantly in nature as the free form; but also, with glucose, in the form of the disaccharide sucrose.

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fructose

fructose (fruk-tohz) n. a simple sugar found in honey and in such fruit as figs. Fructose is one of the two sugars in sucrose.

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fructose

fructoseappose, arose, Bose, brose, chose, close, compose, diagnose, doze, enclose, expose, foreclose, froze, hose, impose, interpose, juxtapose, Montrose, noes, nose, oppose, plainclothes, pose, propose, prose, rose, suppose, those, transpose, underexpose, uprose •Berlioz • flambeaux • thrombose •bandeaux • bulldoze • fricandeaux •metamorphose • pantyhose • glucose •gallows, Hallowes •tableaux • parclose • Fellows •bedclothes • nightclothes • rouleaux •underclothes • misdiagnose •Ambrose • dextrose • Faeroes •primrose • cornrows • sucrose •Burroughs • tuberose •bateaux, gateaux, plateaux •portmanteaux • fructose

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