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What is the difference in the structure of amylopectin and amylose?

Question:

What is the difference in the structure of amylopectin and amylose?

Starch:

Starch is a polysaccharide that is found in plants and stored in the form of carbohydrates. It is a polymer made up of glucose monomers linked through glycosidic linkage to form polysaccharides.

Answer and Explanation: 1

There are two types of polysaccharide molecules in starch. They are:

1) Amylose

2) Amylopectin

Amylose:

  • Amylose is made up of D- glucose units.
  • The D-glucose units in amylose are linked by 1,4 glycosidic bonds.
  • Amylose is a Straight chain polymer of D-glucose units.
  • Starch is composed of 20% of amylose.
  • Amylose is less soluble in water.

The structure of amylose is shown below.

Amylopectin:

  • Amylopectin is made up of a polymer of many D-glucose units.
  • The D-glucose units in amylopectin are linked by 1,4-glycosidic and 1,6 glycosidic bonds.
  • Amylopectin is a branched-chain polymer of D-glucose units.
  • Starch is composed of 80% of amylopectin.
  • Amylopectin is more soluble in water.

The structure of amylopectin is shown below.


The main difference in the structure of amylose and amylopectin is as follows:

  • Amylose is a straight-chain polymer in which a 1,4-glycosidic bond links D-glucose units.
  • Amylopectin is a branched-chain polymer in which 1,4 and 1,6 glycosidic bond links D-glucose units.

Learn more about this topic:

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Starch: Structure, Types & Examples

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Chapter 10 / Lesson 13
14K

In this lesson, we'll go over what the structure of starch is and what it's made of, as well as examples of different types of starch. Then, you can test your knowledge with a brief quiz at the end.


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