It is a substance containing proteolytic enzyme and is present in the gastric juice of animals. obtained from the glandular layer (mucous membrane) of fresh stomach of hog, Sus scrofa domesticus, Suidae. light buff or white colored amorphous powder, also occurs as translucent scales. as a little acidic or saline taste with slightly meaty odor. soluble in water, but insoluble in alcohol, ether and chloroform.