Carbohydrate

Carbohydrates (literally hydrates of carbon) are chemical compounds that act as the primary biological means of storing or consuming energy, other forms being fat and protein. Relatively complex carbohydrates are known as polysaccharides. Carbohydrates are naturally produced by plants and animals. Sugars and starches are carbohydrates. A more precise definition of carbohydrates could be: Carbohydrates are polyhydroxyaldehydes, or polyhydroxyketones, and their derivatives.

Structure

Pure carbohydrates contain carbon, hydrogen, and oxygen atoms, in a 1:2:1 molar ratio, giving the general formula Cn(H2O)n. (This applies only to monosaccharides, see below, although all carbohydrates have the more general formula Cn(H2O)n.) However, many important "carbohydrates" deviate from this, such as deoxyribose and glycerol, although they are not, in the strict sense, carbohydrates. Sometimes compounds containing other elements are also counted as carbohydrates (e.g. chitin, which contains nitrogen).

Related Topics:
Carbon - Hydrogen - Oxygen - Atom - Molar - Ratio - Formula - Deoxyribose - Glycerol - Chitin - Nitrogen

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The simplest carbohydrates are monosaccharides, which are small straight-chain aldehydes and ketones with many hydroxyl groups added, usually one on each carbon except the functional group. Other carbohydrates are composed of monosaccharide units and break down under hydrolysis. These may be classified as disaccharides, oligosaccharides, or polysaccharides, depending on whether they have two, several, or many monosaccharide units.

Related Topics:
Monosaccharide - Aldehyde - Ketone - Hydroxyl - Hydrolysis - Disaccharide - Oligosaccharide - Polysaccharide

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