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The two horizontal bonds are directed toward the viewer (forward of the stereogenic carbon). The two vertical bonds are directed behind the central carbon (away from the viewer).
Sucrose - found in cane sugar and beet sugar - is a disaccharide - formula C 12 H 22 O 11 - consisting of one glucose unit combined with one fructose unit. The two sugars are linked (via an alpha 1,2 glycosidic bond) - effectively an oxygen bridge - formed as a result of a condensation reaction.
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.
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
Introduction to carbohydrates. Carbohydrates. Molecular structure of triglycerides (fats) Saturated fats, unsaturated fats, and trans fats. Biological macromolecules review. Properties, structure, and function of biological macromolecules.
28 Φεβ 2021 · Sucrose is formed when a monomer of glucose and a monomer of fructose are joined in a dehydration reaction to form a glycosidic bond. In the process, a water molecule is lost. By convention, the carbon atoms in a monosaccharide are numbered from the terminal carbon closest to the carbonyl group.
Learning Objectives. Identify the structures of sucrose, lactose, and maltose. Identify the monosaccharides that are needed to form sucrose, lactose, and maltose. Previously, you learned that monosaccharides can form cyclic structures by the reaction of the carbonyl group with an OH group.
