Starch is a nutritional polysaccharide and is the major storage carbohydrate in plants. It is a homopolyscaccaride composed of two polysaccharides:  Amylose and Amylopectin.

Starch
Starch
Amylose  vs Amylopectin


amylose and 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
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33 Comments

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  1. Blue moon16 July 2014 at 00:42

    nice work ... it helped me a lot to complete my notes ... thanks a lot .....

    ReplyDelete
  2. Anonymous4 August 2014 at 05:06

    this is good.

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  3. Anonymous26 November 2014 at 21:44

    Very much thanks ji

    ReplyDelete
  4. Anonymous8 December 2014 at 05:54

    good..

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  5. Anonymous12 April 2015 at 14:36

    Thank you

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  6. Anonymous7 May 2015 at 13:44

    is amylose even soluble in water? in some notes on net it says its different from amylopectin because it is not soluble in water.!

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  7. Anonymous12 May 2015 at 23:05

    thanks (Y)

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  8. Unknown16 May 2015 at 01:05

    thanks it helps alot~!

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  9. Anonymous1 September 2015 at 14:55

    very helpful tnx

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  10. Anonymous3 September 2015 at 05:52

    Thank a million!:D

    ReplyDelete
  11. anne2 October 2015 at 18:12

    can iodine fit neatly inside amylopectin as like amylose?

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  12. Unknown25 January 2016 at 04:15

    thanks for this piece.

    ReplyDelete
  13. Unknown25 January 2016 at 04:16

    thanks for this piece.

    ReplyDelete
  14. Anonymous10 May 2016 at 02:36

    it really helped

    ReplyDelete
  15. popy19 May 2016 at 01:30

    thnkyou it helped me a lot

    ReplyDelete
  16. Unknown24 June 2016 at 07:28

    Thanks, much helpful !

    ReplyDelete
  17. Anonymous22 September 2016 at 11:18

    this was good :)

    ReplyDelete
  18. Unknown30 September 2016 at 23:31

    Nicely explained..sir ji

    ReplyDelete
  19. Unknown12 January 2017 at 23:12

    thanks...rili helped

    ReplyDelete
  20. imraan6 February 2017 at 22:36

    amylase is simply a long chain of glucose molecule however amylopectin is branch attach of glucose in the glucose molecule. (IA)

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  21. imraan6 February 2017 at 22:37

    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.

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  22. Anonymous6 June 2017 at 10:40

    thanks for this.

    ReplyDelete
  23. Anonymous5 November 2017 at 12:58

    its useful..Thank you

    ReplyDelete
  24. Anonymous25 November 2017 at 22:20

    Really good....useful

    ReplyDelete
  25. Khumukcham Robichand Singh M.Sc Extension 202218 December 2017 at 05:51

    thanks for you🙂🙂

    ReplyDelete
  26. Unknown18 April 2018 at 01:33

    this article has played an important role to accomplish my study on starch

    ReplyDelete
  27. Unknown6 May 2018 at 19:54

    Isn't amylose less soluble than amylopectin because amylose is more linear and has less ends to form bonds with water molecules?

    ReplyDelete
  28. Unknown2 August 2018 at 21:56

    this is helpful to complete my notes

    ReplyDelete
  29. APUOYO27 August 2018 at 12:48

    Nice work. You make teaching much easier

    ReplyDelete
  30. Unknown10 June 2019 at 06:16

    thanks helped me alot

    ReplyDelete
  31. prem lal dhankar13 July 2019 at 00:27

    thank you so much...

    ReplyDelete
  32. Unknown3 January 2020 at 04:22

    thans a lot

    ReplyDelete

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