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• History

  At the Rockefeller Institute in New York in 1939, Rene Dubos isolated a bactericidal, proteinfree extract from Bacillus brevis.11 This material, tyrothricin, was soon shown to consist mainly of a cyclic decapeptide called tyrocidin, together with a similar compound called gramicidin S, which was 50 times as potent.12 Their structures were elucidated by Richard Synge at the Lister Institute in London using paper chromatography in one of its earliest applications.13,14 Although both components were able to protect mice against pneumococci, they were too toxic for general use.
   
  Tyrothricin was suitable only for topical application. It was marketed in the USA by Sharp & Dohme in 1942 for treatment of Gram-positive infections. Since then, it has been universally used in throat lozenges as a non-prescription antibiotic, but the commercial success of this type of product has been largely due to the incorporation of benzocaine, a topical anaesthetic that soothes sore throats.;

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