Amylopsin is an enzyme which is called the amylase of the pancreatic juice.This enzyme helps in the conversion of starch to sugar. This enzyme has a pH of around 2 to 3 which falls under the acidic range. Is activated in alkaline pH.Rennin is a protein digesting enzyme. It helps in curdling and coagulation the milk. It is found in the gastric juice of the stomach in the newborns as it helps in the digestion of milk protein.