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[pep-tohn] /ˈpɛp toʊn/
noun, Biochemistry.
any of a class of diffusible, soluble substances into which proteins are converted by partial hydrolysis.
Origin of peptone
1855-60; < German Pepton < Greek peptón, neuter of peptós cooked, digested, verbid of péptein
Related forms
peptonelike, adjective
[pep-ton-ik] /pɛpˈtɒn ɪk/ (Show IPA),
[pep-tuh-noid] /ˈpɛp təˌnɔɪd/ (Show IPA),
noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for peptone
Historical Examples
  • Protein, under the same conditions, is changed to a peptone.

    A Civic Biology George William Hunter
  • Thus, 7.5 grammes of peptone dissolved in water in such proportion as to make a five per cent.

    On Digestive Proteolysis R. H. Chittenden
  • On the other hand, when peptone was introduced in larger quantity, viz., in a twenty per cent.

    On Digestive Proteolysis R. H. Chittenden
  • Further, it is not enough to admit the formation of a single intermediate body, midway between syntonin and peptone.

    On Digestive Proteolysis R. H. Chittenden
  • On now testing a portion of the clear filtrate for peptone by the biuret test, not a trace of a reaction could be obtained.

    On Digestive Proteolysis R. H. Chittenden
  • Its function is to convert the proteids into peptone, which is effected by its active principle, termed pepsin.

  • This is because the pancreatic ferment (trypsin) has digested the casein into "peptone," which does not curdle.

    A Practical Physiology Albert F. Blaisdell
  • Pepsin, in the presence of hydrochloric acid, acts on proteids, and changes them into proteoses peptone and proteoses and peptone.

    Encyclopedia of Diet Eugene Christian
  • We have learned that in the digestive tract foods are converted into a soluble form of proteid known as peptone.

    Encyclopedia of Diet Eugene Christian
  • Thus prepared, the peptone shows no signs of decomposition on keeping.

British Dictionary definitions for peptone


(biochem) any of a group of compounds that form an intermediary group in the digestion of proteins to amino acids See also proteose
Derived Forms
peptonic (pɛpˈtɒnɪk) adjective
Word Origin
C19: from German Pepton, from Greek pepton something digested, from peptein to digest
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for peptone

1860, from German Pepton, from Greek pepton, neuter of peptos "cooked, digested" (see peptic).

Online Etymology Dictionary, © 2010 Douglas Harper
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peptone in Medicine

peptone pep·tone (pěp'tōn')
Any of various soluble compounds that do not coagulate, are obtained by acid or enzyme hydrolysis of natural protein, and are used as nutrients in culture media.

pep·ton'ic (-tŏn'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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