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. 

  • add Iodine solution to a solution or directly onto materials such as bread, potato, crackers...
  • BLUE-BLACK COLOR is a positive result: starch is present


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.


1 comment:

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