List out the various enzymes present in the secretions of GIT.

The various enzymes present in the secretions of GIT. 

Enzyme Name	Source	Substrates	Products	Notes (if applicable)
Aminopeptidase	Small intestine	Amino acid at amino end of peptides	Amino acids & peptides	n/a
Carboxypeptidase	Pancreatic acinar cells	Amino acid at carboxyl end of peptides	Amino acids & peptides	Activated from procarboxypeptidase by trypsin; optimum pH varies
Chymotrypsin	Pancreatic acinar cells	Proteins	Peptides	Activated from chymotrypsinogen by trypsin; optimum pH 7.8
Deoxyribonuclease	Pancreatic acinar cells	DNA	Nucleotides	n/a
Dipeptidase	Small intestine	Dipeptides	Amino acids	n/a
Elastase	Pancreatic acinar cells	Proteins	Peptides	Activated from proelastase by trypsin
Enterokinase	Small intestine	Trypsinogen	Trypsin	n/a
Gastric lipase	Stomach chief cells	Triglycerides	Fatty acids & monoglycerides	Optimum pH 4-5
Lactase	Small intestine	Lactose	Glucose & galactose	n/a
Lingual lipase	Lingual glands in tongue	Triglycerides (fats & oils) & other lipids	Fatty acids & diglycerides	Optimum pH 4.5-5.5
Maltase	Small intestine	Maltose	Glucose	n/a
Nucleosidases & phosphatases	Small intestine	Nucleotides	Nitrogenous bases, pentoses, phosphates	n/a
Pancreatic amylase	Pancreatic acinar cells	Starches	Maltose, maltotriose, α-dextrins	Optimum pH 6.7-7.0
Pancreatic lipase	Pancreatic acinar cells	Triglycerides emulsified by bile salts	Fatty acids & monoglycerides	Optimum pH 8.0
Pepsin	Stomach chief cells	Proteins	Peptides	Activated from pepsinogen by pepsin & HCl; optimum pH 1.5-1.6
Ribonuclease	Pancreatic acinar cells	RNA	Nucleotides	n/a
Sucrase	Small intestine	Sucrose	Glucose & fructose	n/a
Salivary amylase	Salivary glands	Starches	Maltose, maltotriose (trisaccharide), α-dextrins	Optimum pH 6.7-7
Trypsin	Pancreatic acinar cells	Proteins	Peptides	Activated from trypsinogen by enterokinase; optimum pH 7.8-8.7
α-Dextrinase	Small intestine	α-dextrins	Glucose	n/a