peptone


peptone
Descriptive term applied to intermediate polypeptide products, formed in partial hydrolysis of proteins, that are soluble in water, diffusible, and not coagulable by heat; used in bacterial culture media.

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pep·tone 'pep-.tōn n
1) any of various protein derivatives that are formed by the partial hydrolysis of proteins (as by enzymes of the gastric and pancreatic juices or by acids or alkalies), that are not coagulated by heat, and that are soluble in water but unlike proteoses are not precipitated from solution by saturation with ammonium sulfate
2) a complex water-soluble product that contains peptones and other protein derivatives, is obtained by digesting protein (as meat) with an enzyme (as pepsin or trypsin), and is used chiefly in nutrient media in bacteriology

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n.
a large protein fragment produced by the action of enzymes on proteins in the first stages of protein digestion.

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pep·tone (pepґtōn) [Gr. pepton digesting] a derived protein, or a mixture of cleavage products produced by the partial hydrolysis of a native protein either by an acid or by an enzyme. Peptones are readily soluble in water and are not precipitatable by heat, by alkalis, or by saturation with ammonium sulfate. peptonic adj

Medical dictionary. 2011.

Look at other dictionaries:

  • peptone — [ pɛptɔn ] n. f. • 1857; all. Pepton, du gr. peptein « digérer » ♦ Biochim. Mélange obtenu par la dégradation des viandes sous l effet d enzymes (pepsine, pancréatine, papaïne). Milieu de culture à la peptone. Administration thérapeutique de… …   Encyclopédie Universelle

  • Peptone — Peptone, die Endprodukte der Spaltung nativer Eiweißstoffe durch Fermente, durch Einwirkung verdünnter Säuren oder gespannter Wasserdämpfe, insofern sich diese Produkte durch ihr Verhalten (Biuretreaktion, Zusammensetzung und physiologisches… …   Lexikon der gesamten Technik

  • Peptone — Pep tone, n. [Gr. ? cooked.] (Physiol. Chem.) (a) The soluble and diffusible substance or substances into which albuminous portions of the food are transformed by the action of the gastric and pancreatic juices. Peptones are also formed from… …   The Collaborative International Dictionary of English

  • peptone — peptone. См. пептон. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Peptōne — Peptōne, sind die durch das Pepsin in eine lösliche Form umgewandelten Proteĭnsubstanzen, wie sie in das Blut gelangen, wo sie wieder in echte Proteĭnkörper (s.d.) zurückgebildet werden …   Pierer's Universal-Lexikon

  • Peptōne — Peptōne, Umwandlungsprodukte der eiweißartigen Stoffe, die sich im Magen unter dem Einfluß des Pepsins, im Darm durch das Ferment der Bauchspeicheldrüse bilden. Ähnliche peptonbildende Fermente sind auch im Wicken , Hanf und Leinsamen und in der… …   Meyers Großes Konversations-Lexikon

  • Peptone —   [zu griechisch peptós »gekocht«, »verdaut«], Singular Pepton das, s, durch künstliche enzymatische Spaltung von Proteinen (u. a. Kasein, Gelatine, Fleisch) hergestellte niedermolekulare Eiweißspaltprodukte, die v. a. als Bakteriennährböden… …   Universal-Lexikon

  • peptone — [pep′tōn΄] n. [Ger pepton < Gr, neut. of peptos, digested < peptein: see PEPSIN] any of a group of soluble and diffusible derived proteins formed by the action of enzymes on proteins, as in the process of digestion, or by acid hydrolysis of …   English World dictionary

  • Peptone — Le mot peptone désigne en général le produit d une réaction d hydrolyse de protéines. Cette hydrolyse peut être chimique (hydrolyse acide) ou enzymatique. Le taux d hydrolyse dépend des substrats, des agents hydrolysants et des conditions… …   Wikipédia en Français

  • peptone — pep·tó·ne s.m. TS chim., biochim. ciascuno dei prodotti che si formano durante i processi naturali di demolizione delle sostanze proteiche per azione di fermenti proteolitici (come ad es. la pepsina) o durante il trattamento di proteine con… …   Dizionario italiano

  • peptone — peptonas statusas T sritis chemija apibrėžtis Nevisiškos baltymo hidrolizės produktas. atitikmenys: angl. peptone rus. пептон …   Chemijos terminų aiškinamasis žodynas


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