Wednesday, 18 December 2013

Disaccharide

disaccharide or biose[1] is the carbohydrate formed when two monosaccharides undergo a condensation reaction which involves the elimination of a small molecule, such as water, from the functional groups only. Like monosaccharides, disaccharides form an aqueous solution when dissolved in water. Three common examples are sucroselactose,[2] and maltose.
'Disaccharide' is one of the four chemical groupings of carbohydrates (monosaccharide, disaccharide, oligosaccharide, and polysaccharide).

Common disaccharides

DisaccharideUnit 1Unit 2Bond
Sucrose (table sugarcane sugarbeet sugar, or saccharose)GlucoseFructoseα(1→2)β
LactuloseGalactoseFructoseβ(1→4)
Lactose (milk sugar)GalactoseGlucoseβ(1→4)
MaltoseGlucoseGlucoseα(1→4)
TrehaloseGlucoseGlucoseα(1→1)α
CellobioseGlucoseGlucoseβ(1→4)

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