Give an activity to show the effect of saliva on starch. which enzyme is responsible for this. what is the source of this enzyme?
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Answers
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Answer:
First, salivary glands in our mouth make salivary amylase, which begins the digestive process by breaking down starch when we chew our food, converting it into maltose, a smaller carbohydrate.
The breakdown of starch is just one of the many steps in the process of digestion. Although digestion begins in the mouth, it continues in the stomach and intestines.
Amylase is an enzyme that breaks down starch to sugar. The amylase in the mouth, salivary amylase, is called ptyalin.
Ptyalin can do digestive can work in the stomach for several hours. Iodine and Benedict's solution is used to recognize starch and sugar (maltose) in our saliva.
Add a pinch of flour to a test tube half filled with water, mix it properly.
Activity:
Add a few drops of iodine solution to the mixture.
If the solution turns blue, then the presence of starch in the flour is confirmed.
Again add a pinch of flour to a test tube filled half with water, mix it properly and divide the mixture into two parts by transferring it to another test tube.
Two one of the test tube, add a few drops of saliva and leave it for 30 to 45 minutes.
Add iodine solution into both the test tubes.
It is observed that the solution with saliva in it does not turn blue, whereas the solution without saliva turns blue.
The starch present in the flour traps the iodine inside its structure and hence blue colour is observed. Saliva has amylase enzyme in it which dissolves starch to simpler sugars and hence the solution with saliva in it could not show blue colour due to lack of starch.