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Cellobiose is a disaccharide with the formula (C 6 H 7 (OH) 4 O) 2 O. It is classified as a reducing sugar - any sugar that possesses the ability or function of a reducing agent. The chemical structure of cellobiose is derived from the condensation of a pair of β-glucose molecules forming a β(1→4) bond.
A glycosidic bond or glycosidic linkage is a type of ether bond that joins a carbohydrate (sugar) ... [10] investigated use of cellobiose phosphorylase (CP) toward ...
There are two functionally different classes of disaccharides: Reducing disaccharides, in which one monosaccharide, the reducing sugar of the pair, still has a free hemiacetal unit that can perform as a reducing aldehyde group; lactose, maltose and cellobiose are examples of reducing disaccharides, each with one hemiacetal unit, the other occupied by the glycosidic bond, which prevents it from ...
Reducing disaccharides like lactose and maltose have only one of their two anomeric carbons involved in the glycosidic bond, while the other is free and can convert to an open-chain form with an aldehyde group. The aldehyde functional group allows the sugar to act as a reducing agent, for example, in the Tollens' test or Benedict's test.
Each glucose monomer is linked via a beta-1,4 glycosidic bond. The most common cellodextrins are listed below: [1] cellobiose (DP=2) (sometimes not included in cellodextrin classification) cellotriose (DP=3) cellotetraose (DP=4) cellopentaose (DP=5) cellohexaose (DP=6)
The formation of a glycosidic linkage results in the formation of a new stereogenic centre and therefore a mixture of products may be expected to result. The linkage formed may either be axial or equatorial (α or β with respect to glucose). To better understand this, the mechanism of a glycosylation reaction must be considered.
When the glycosidic linkages and configurations of the monosaccharides are known, they may be included as a prefix to the name, with the notation for glycosidic linkages preceding the symbols designating the configuration. [3] The following example will help illustrate this concept: (1→4)-β-D-Glucan
If the glycosidic bond to the anomeric carbon (C 1) were in the same plane as the CH 2 OH substituent, it would be classified as a β(1→4) bond, and the resulting molecule would be cellobiose . The anomeric carbon (C 1 ) of the second glucose molecule, which is not involved in a glycosidic bond, could be either an α- or β-anomer depending ...