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peptone Syllabification: pep·tone
Pronunciation: /ˈpeptōn/

Definition of peptone in English:


1A soluble protein formed in the early stage of protein breakdown during digestion.
Example sentences
  • Supplementation of cultures with the rich nutrient peptone has been previously shown to suppress submerged culture conidiation.
  • Yeast extract / peptone / dextrose, synthetic selective media, and minimal media were prepared as described.
  • They are professional colleagues, too, and have published a paper together about immunity from the anticoagulant action of peptone.
1.1 (also peptone water) A solution of peptone in saline, used as a liquid medium for growing bacteria.
Example sentences
  • Briefly, S. Typhimurium was grown on nutrient agar and passed into peptone water before subculturing on Congo red agar.
  • I will need some lactose broth and the modified peptone water so I can test for all possibilities.
  • Bactosoytone, the medium that is used to cultivate bacteria in the process of making monosodium glutamate, is one of the peptones.


Mid 19th century: from German Pepton, from Greek pepton, neuter of peptos 'cooked, digested'.

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