23 December 2012

#30 Food test 1 - Starch test

The brown Iodine solution reacts with starch and changes it to a blue-black color. This test helps you to find out if a food contains starch. 
Process
  • add Iodine solution to a solution or directly onto materials such as bread, potato, crackers...
  • a BLUE-BLACK COLOR is a positive result: starch is present


Explanation

 Starch can be separated into two fractions- amylose and amylopectin.


Amylose in starch is responsible for the formation of a deep blue color in the presence of iodine. The iodine molecule slips inside of the amylose coil to give a special color.



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2 comments:

  1. Nova PathfindersAugust 4, 2016 at 12:44 PM

    Thanks For giving information. I am finding that type of information for food testing.

    ReplyDelete
  2. UnknownFebruary 13, 2019 at 2:33 AM

    Thank you for the notes

    ReplyDelete

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