Starch is a nutritional polysaccharide and is the major storage carbohydrate in plants. It is a heteropolyscaccaride composed of two polysaccharides: Amylose and Amylopectin.
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Amylose vs Amylopectin
Amylose
1.It constitutes about 20% of the starch
2. Amylose is a straight chain polymer of D-glucose units
3. The bonding involved is α-1->4 glycosidic linkage
4. With iodine amylose stains blue
5. α and β amylases can hydrolyse amylose
6. more soluble in water
7. Soluble in hot water without swelling
8. Soluble in hot water but does not form starch gel or paste
Amylopectin
1.It constitutes about 80% of the starch
2. Amylopectin is a branched chain polymer of D-glucose units
3. The bonding involved is α-1->4 glycosidic linkage and α-1->6 glycosidic linkage at branch points
4. With iodine amylopectin stains reddish brown
5. α and β amylases can hydrolyse α-1->4 glycosidic linkage but cannot hydolyse α-1->6 glycosidic linkage at branch points of amylopectin
6. less soluble in water
7. Soluble in hot water with swelling
8. Soluble in hot water but form starch gel or paste
28 comments:
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is amylose even soluble in water? in some notes on net it says its different from amylopectin because it is not soluble in water.!
thanks (Y)
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can iodine fit neatly inside amylopectin as like amylose?
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amylase is simply a long chain of glucose molecule however amylopectin is branch attach of glucose in the glucose molecule. (IA)
Amylose is a glucose polymer with long chain-like molecules, while amylopectin consists of larger highly branched molecules (1 to 6). Glycogen consists of even more branches than amylopectin. Amylose and amylopectin are classified as starch, and are found in plants, while glycogen serves as the main energy reserve for animals.
thanks for this.
starch is homopolysaccharide please correct this one,
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this article has played an important role to accomplish my study on starch
Isn't amylose less soluble than amylopectin because amylose is more linear and has less ends to form bonds with water molecules?
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