Tryptic soy broth

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Tryptic soy broth or Trypticase soy broth (frequently abbreviated as TSB) is used in microbiology laboratories as a culture broth to grow aerobic bacteria. It is a complex, general purpose medium that is routinely used to grow certain pathogenic bacteria, which tend to have high nutritional requirements (i.e., they are fastidious). Its agar counterpart is tryptic soy agar (TSA).[1] One of the components of Tryptic soy broth is Phytone, which is an enzymatic digest of soybean meal.

TSB is frequently used in commercial diagnostics in conjunction with the additive Thio which promotes growth of anaerobes.[2]


To prepare TSB, the following ingredients are dissolved under gentle heat and then autoclaved for 15 minutes at 121 °C (250 °F).



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  2. ^ Doyle, JE; Mehrhof, WH; Ernst, RR (1968). "Limitations of thioglycolate broth as a sterility test medium for materials exposed to gaseous ethylene oxide". Appl Microbiol. 16 (11): 1742–4. PMC 547751. PMID 4973064.
  3. ^ "BAM Media M154: Trypticase (Tryptic) Soy Broth". Food and Drug Administration. January 2001. Retrieved 18 April 2015.