Describe an experiment to show the action of Saliva on cooked starch

Experiment

• Two test tubes A and B add equal amount of cooked starch
• To test tube A add 1cm³ of saliva
• To test tube B add 1cm³ of water
• Incubate the two test tubes at 35⁰ for 60minutes
• After 60minutes divide the contents of each test tube into two and use one portion to test for starch by adding drops of iodine solution and the second portion add Benedict’s solution and boil to test for reducing sugars

Results

Test tube A contain little or no starch but much reducing sugars

Test tube B contains much starch but no reducing sugars

Conclusion

Saliva breaks down starch to reducing sugars