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A protease type enzyme found in the digestive system that breaks down proteins into peptides.

Synonyms and Related Terms

pepsinum; puerzym; Pepsin A; Pepsin NF


  • Contact may cause irritation and allergic reactions:
  • Fisher Scientific: MSDS

Physical and Chemical Properties

Soluble in water. Insoluble in ethanol, chloroform and ether. Optimum pH is 3 to 5.

CAS 9001-75-6
Molecular Weight mol. wt. about 34500

Resources and Citations

  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 7289
  • Richard C. Wolbers, Nanette T. Sterman, Chris Stavroudis, Notes for Workshop on New Methods in the Cleaning of Paintings, J.Paul Getty Trust, Los Angeles, 1990
  • Teri Hensick, contributed information, 1998