Difference Between Amylose And Amylopectin (original) (raw)
Last Updated : 23 Jul, 2025
Starch is composed of two types of polysaccharide molecules, Amylose And Amylopectin. Starch is a complex carbohydrate found in a variety of plants, including grains, potatoes, and beans. It is composed of long chains of glucose molecules joined together by chemical bonds. Because starch can be broken down into glucose and used as fuel by the body, it is an important source of energy for both plants and animals. It is also commonly used as a thickener or stabilizer in various food products such as soups, sauces, and baked goods.
For more information, read: Polysaccharides
What is Amylose?
Amylose is a polysaccharide, which is a complex carbohydrate made up of many glucose molecules linked together by a chemical bond. Amylose is a linear chain of glucose units connected by alpha-1,4 glycosidic bonds. It is a component of starch found in many plant-based foods such as potatoes, rice, and corn. Amylose accounts for approximately 20-30% of plant starch and is responsible for starch's ability to form a gel-like substance when heated in water. It is also a significant source of energy for the human body because it can be broken down into glucose and used as fuel.
What is Amylopectin?
Amylopectin is a polysaccharide, which is a complex carbohydrate made up of many glucose molecules linked together by chemical bonds. Amylopectin is a branched chain of glucose units connected by alpha-1,4 glycosidic bonds, with occasional alpha-1,6 glycosidic bonds forming branches. It is a component of starch found in many plant-based foods such as potatoes, rice, and corn. Amylopectin accounts for approximately 70-80% of plant starch and is responsible for starch's ability to be rapidly digested and broken down into glucose for energy. It is also commonly used in the food industry as a thickener, stabilizer, or gelling agent in a variety of products such as puddings, ice cream, and other processed foods.
Structure of Amylose and Amylopectin
Difference Between Amylose and Amylopectin
| Characteristics | Amylose | Amylopectin |
|---|---|---|
| Structure | Linear | Branched |
| Bonding | Alpha-1,4 | Alpha-1,4 and Alpha-1,6 |
| Chain Length | Long | Shorter with branches |
| Proportion in Starch | 20-30% | 70-80% |
| Digestibility | Slower | Faster |
| Solubility in Water | Lower | Higher |
| Dissolved in Hot water | Forms a gel | Does not form a gel |
| Glycemic Index | Lower | Higher |
| Sweetness | Less sweet | Sweeter |
| Energy Release | Sustained | Quick |
| Enzyme Activity | More resistant | More easily degraded |
| Present In | Rice, potatoes, corn | Rice, potatoes, corn |
| Molecular Weight | 10^6-10^7 g/mol | 10^8-10^9 g/mol |
Similarities Between Amylose and Amylopectin
- Polysaccharides: Amylose and amylopectin are both types of polysaccharides, meaning they are composed of many monosaccharide units (glucose molecules) linked together.
- Found in starch: Amylose and amylopectin are the two main components of starch, a carbohydrate that is used by plants as an energy storage molecule
- Composed of glucose monomers: Amylose and amylopectin are both composed of glucose monomers that are linked together by glycosidic bonds.
- Broken down by enzymes: Both amylose and amylopectin can be broken down by enzymes such as amylase, which cleaves the glycosidic bonds between the glucose monomers.
- Both are used for energy storage: Amylose and amylopectin are both used by plants as a way to store energy in a compact and easily accessible form.
- Have alpha glycosidic bonds: Both amylose and amylopectin have alpha glycosidic bonds between their glucose monomers, which gives them their distinct structure.
- Both are water-insoluble: Both amylose and amylopectin are water-insoluble, which is important for their role in energy storage in plants.
- Both have helical structures: Both amylose and amylopectin have helical structures, with amylose forming a tighter helix than amylopectin.