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11 Μαΐ 2021 · In the case of disaccharides, one monosaccharide acts a the hemiacetal while the other monosaccharides acts as the alcohol. The formation of an acetal (or ketal) bond between two monosaccharides is called a glycosidic bond or glycosidic linkage.
Hydrolysis of Sucrose. In the hydrolysis of any di- or poly saccharide, a water molecule helps to break the acetal bond as shown in red. The acetal bond is broken, the H from the water is added to the oxygen on the glucose. The -OH is then added to the carbon on the fructose. Figure \(\PageIndex{1}\): Hydrolosis of Sucrose
The two sugars are linked (via an alpha 1,2 glycosidic bond) - effectively an oxygen bridge - formed as a result of a condensation reaction. Label / unlabel bonding carbon atom numbers. In the sucrose molecule there are 12 carbon atoms, and 2 ring-shaped structures, each containing an oxygen atom.
Sucrose (common table sugar), is a disaccharide formed from one unit of glucose and one unit of fructose. The anomeric carbons of both glucose and fructose are involved in the glycosidic bond; sucrose; therefore, is a non-reducing sugar.
By convention, the carbon atoms in a monosaccharide are numbered from the terminal carbon closest to the carbonyl group. In sucrose, a glycosidic linkage is formed between carbon 1 in glucose and carbon 2 in fructose.
Sucrose: In sucrose, the components glucose and fructose are linked via an ether bond between C1 on the glucosyl subunit and C2 on the fructosyl unit. The bond is called a glycosidic linkage.
31 Μαΐ 2022 · Sucrose is a non-reducing sugar which gives a negative result in a Benedict’s test. When sucrose is heated with hydrochloric acid this provides the water that hydrolyses the glycosidic bond resulting in two monosaccharides that will produce a positive Benedict's test.
