Definition of peptone in English:


Line breaks: pep|tone
Pronunciation: /ˈpɛptəʊn


[mass noun] Biochemistry
  • 1A soluble protein formed in the early stage of protein breakdown during digestion.
    More 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.
    More 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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