Question

Why Salivary amylase doesn't act on starch if heated?

Answer 1

If we add saliva on starch, the salivary amylase present in saliva gradually acts on starch and converts it into maltose. Starch keeps on giving blue colour with iodine till it is completely digested into maltose. At this point, no blue colour is formed. This is the end point or achromic point.

Answer 2

Salivary amylase is an enzyme and once it is heated, it is denatured as at high temperatures enzymes are denatured, at low temperature enzyme becomes inactive, therefore the enzymes will be denatured thus it will not act on starch