Title: To test for starch
Aim: To test certain foods to see if they contain starch
Materials: foods containing starch, iodine, potassium iodine, water, Benedict’s solution
Equipment: test tubes, test tube racks, water baths (boiling), eye protection
1) Two to three drops of the iodine were dropped in the potassium iodine solution to 2cm cube of the starch suspension.
2) Then a suspension was made up of the foods by mixing it with water.
3) Then two to three drops of the iodine was then dropped in the potassium iodine solution to each suspension.
The liquid containing the rice in it turned to a black color, which shows there is starch present.
The liquid containing the peas in it, turned to a light brown color, which shows there is little amounts of starch present.
The liquid containing the bread in it turned to a black color, which shows there is starch present.
The liquid containing the noodles in it had turned to a black color, which shows there is starch present.
Starch or amylum is a carbohydrate consisting of a large number of glucose units joined by glycoside bonds. This starch is also found in green(leafy) plants as an energy store. Starches and sugars are the major carbohydrates or foods that produce energy for the body
In conclusion the test was a success in showing the contents of protein in some of the foods said to contain protein in them