Maltose - C12H22O11

What is Maltose?

Maltose is formed from two molecules of glucose. When the two molecules bond together, a molecule of water (HO) is removed. Maltose, malt sugar, C12H22O11.H2O, is prepared from starch by diastase. Hydrolysis by acids or maltase gives only d-glucose. In lean dough no added sugar, most of the sugar available to yeast is maltose, derived from starch. Maltose behaves like an early product of photosynthesis, rather than a storage product such as starch and its degradation products.

Other names – Cextromaltose, Maltobiose, Maltodiose, D-Maltose




1.54 g/cm³

Molecular Weight/ Molar Mass

342.3 g/mol

Specific Rotation

+130.5 [α]20D

Melting Point

160 to 165 °C

Chemical Formula


Maltose Structure – C12H22O11

Maltose Structure

Physical Properties of Maltose – C12H22O11


No odour


White powder or crystals

Covalently-Bonded Unit


Heat capacity

298.15 K




Soluble in water

Chemical Properties of Maltose – C12H22O11

  • Maltose undergoes hydrolysis results in the formation of ethanol and carbon dioxide. The chemical equation is given below.
  • C12H22O11 + H2O → 4C2H5OH + 4CO2

  • Maltose reacts with sulfuric acid forms carbon dioxide, water and sulfur dioxide. The chemical equation is given below.
  • C12H22O11 + 24H2SO4 → 12CO2 + 35H2O + 24SO2

Uses of Maltose – C12H22O11

  • Used for brewing as their composition is similar to wort. Also in doughs with strong fermenting yeasts as these are able to metabolise maltose quickly.
  • Used as a carrying material for flavoring materials and volatile aromas. It is also used in infant foods.
  • The medicinal use of maltose is based on its repair and protection of the liver, for which modern glucose is used.

Practise This Question

Which of the following depict a π-bond?

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