1. Chapter 15 Carbohydrates
15.4 Chemical Properties of
Monosaccharides
General, Organic, and Biological Chemistry

2. Reducing Sugars Reducing sugars
are monosaccharides with a carbonyl group that oxidizes to give a carboxylic acid
undergo reaction with Benedict’s reagent (Cu2+) to give the corresponding carboxylic acid
include the monosaccharides glucose, galactose, and fructose
General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc.

3. Oxidation of D-Glucose, a Reducing Sugar
Glucose is oxidized to a carboxylic acid.
Benedicts reagent
General, Organic, and Biological Chemistry

4. Reduction of Monosaccharides
The reduction of
monosaccharides
involves the carbonyl group
produces sugar alcohols called alditols
such as D-glucose gives
D-glucitol, also called
D-sorbitol
General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc.

5. Learning Check Write the products of the oxidation and reduction of
D-mannose.
D-Mannose
General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc.

6. Solution Write the products of the oxidation and reduction of
D-mannose.
D-Mannitol D-Mannose D-Mannonic acid
General, Organic, and Biological Chemistry Copyright © 2010 Pearson Education, Inc.