Question

given: starch, iodine, Amylase , water
of the given chemicals _______ is the substrate and ______ is the indicator chemical.

Answer 1

Starch, iodine

Starch is a polysaccharide of glucose units. It is a branched polymer. It is formed by the condensation of glucose units. Two glucose molecules are joined together by glycosidic linkage.

The presence of starch in a given medium can be detected by using lugol's Reagent. It is a mixture of potassium iodide and Iodine. It is a yellowish red colour reagent and in the presence of starch gives a blue black colour.

Amylase enzyme which is responsible for the breakdown of starch into glucose unit. Salivary amylase is present in our saliva and therefore the process of starch digestion begins in our mouth. Pancreatic amylase is present in the pancreatic juice as well for the digestion of starch.

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