#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.
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.