Amylase is not active in the stomach, the environment is too acidic. This is why the pancrease produces and secretes amylase into the duodenum after food leaves the stomach, t … o replace the amylase secreted by salivary glands and denatured by stomach acid.he pH of the stomach is quite a bit lower than the pH of the saliva and the salivary amylase ten … ds to get denatured in the acidic stomach environment. + 2 others found this useful.