Classification of Enzymes

The following is a summary of the digestive enzymes:


  1. Mouth
    1. salivary a-amylase: cooked starch (dextrins, maltose, and maltriose)
  2. Stomach
    1. gastric lipase: emulsified fat (fatty acids and glycerol)
    2. Pepsin: proteins and polypeptides (polypeptides and amino acids)
    3. Rennin: casein of milk (calcium caseinate)
  3. Pancreas
    1. carboxypeptidase A: proteins and polypeptides (aromatic or branch chain amino acids)
    2. carboxypeptidase B: proteins and polypeptides (basic side chain amino acids)
    3. chymotrypsin: protein and polypeptides (polypeptides, proteoses, and peptones)
    4. deoxyribonuclease: DNA (mononucleotides)
    5. elastase: elastin and other protein (neutral aliphatic amino acids)
    6. cholesterol esterase: cholesterol esters (cholesterol and fatty acids)
    7. pancreatic a-amylase: cooked starch (dextrins, maltose, and maltriose)
    8. pancreatic lipase: fat and triglycerides (glycerides, fatty acids, and glycerol)
    9. phospholipase A: lecithin (lysolecithin)
    10. ribonuclease: RNA (mononucleotides)
    11. trypsin: proteins and polypeptides (polypeptides, peptones, and proteoses)
  4. Small intestine
    1. aminopeptidase: polypeptides (N-terminal amino acids)
    2. dipeptidase: dipeptides (two amino acids)
    3. enterokinase: trypsinogen (trypsin)
    4. intestinal lipase: monoglycerides (glycerol and fatty acids)
    5. isomaltase: dextrins (glucose)
    6. lactase: lactose (glucose and galactose)
    7. maltase: maltose (glucose)
    8. nucleosidase: nucleosides (purines, pyrimidines, and pentose)
    9. sacrase: sucrose (glucose and fructose)