What is Sucrose?
Sucrose is a molecule composed of two monosaccharides, namely glucose and fructose. This non-reducing disaccharide has a chemical formula of C12H22O11. Sucrose is commonly referred to as table sugar or cane sugar.
In a C12H22O11 molecule, the fructose and glucose molecules are connected via a glycosidic bond. This type of linking of two monosaccharides called glycosidic linkage. Sucrose has a monoclinic crystal structure and is quite soluble in water. It is characterized by its sweet taste.
William Miller, an English chemist, coined the word sucrose in the year 1857. It is widely used as a sweetener in food. C12H22O11 can be obtained from sugar beets or sugar canes, but it must be refined to be fit for human consumption. Refined sucrose (or sugar) is a popular ingredient in many food recipes because of its sweet taste.
Structure of Sucrose
As discussed earlier, sucrose is a disaccharide which is made up of two monosaccharides. The structure of a sucrose molecule is illustrated below.
The glycosidic linkage that connects the two carbohydrate groups can be observed in the illustration provided above. There are no anomeric hydroxyl groups in a sucrose molecule. It can, therefore, be classified as a non-reducing sugar (since it does not act as a reducing agent).
Properties of Sucrose
|Chemical Formula of Sucrose||C12H22O11|
|Molar Mass or Molecular Weight||342.30 g/mol|
|Physical Appearance||White, crystalline solid|
|Melting Point||Decomposes at 459 K|
- Sucrose has a monoclinic crystal structure.
- When subjected to high temperatures (over 186oC), this compound decomposes, yielding caramel.
- Its solubility in water at a temperature of 20oC is 203.9g/100mL
- The standard enthalpy of combustion corresponding to sucrose is 5647 kJ.mol-1.
- Sucrose can undergo a combustion reaction to yield carbon dioxide and water.
- When reacted with chloric acid, this compound yields hydrochloric acid, carbon dioxide, and water.
- Upon hydrolysis, the glycosidic bond linking the two carbohydrates in a C12H22O11 molecule is broken, yielding glucose and fructose.
- Sucrose can be dehydrated with the help of H2SO4 (which acts as a catalyst) to give rise to a black solid which is rich in carbon.
Uses of Sucrose
Some of the important uses of this compound are listed below.
- Sucrose is one of the most important components of soft drinks and other beverages.
- This compound is used in many pharmaceutical products.
- It serves as a chemical intermediate for many emulsifying agents and detergents.
- It also serves as a food thickening agent and as a food stabilizer.
- The shelf lives of many food products, such as jams and jellies, are extended with the help of this compound.
- The use of sucrose in baking results in the brown colour of the baked products.
- This compound also serves as an antioxidant (a compound that inhibits oxidation).
- Sucrose is widely used as a food preservative.
Thus, the structure of a sucrose molecule, its physical and chemical properties, and its uses are discussed briefly in this article. To learn more about this disaccharide and other disaccharides, such as lactose, register with BYJU’S and download the mobile application on your smartphone.