First of all, starch is a kind of polysaccharide, which is finally decomposed into glucose under the catalysis of concentrated sulfuric acid or amylase.

Secondly, amylase is a kind of protein (remember, any "enzyme" is protein), which can specifically catalyze the decomposition of starch into glucose. .....

If you want to know more first, you can go to Baidu for specific information. I'm just describing it roughly ~ ~ ~

Look how thoughtful I am. Give me the money ~ ~ Hehe ~ ~