Folia Microbiologica

, Volume 50, Issue 6, pp 487–493 | Cite as

A rapid screening method for detecting active compounds against erythromycin-resistant bacterial strains of Finnish origin

  • K. Kreander
  • P. Vuorela
  • P. Tammela


A rapid and simple microdilution technique on 96-well microplate based on turbidimetry was optimized and validated for screening of antimicrobial activity against erythromycin-resistant bacterial strains ofStreptococcus pyogenes andStaphylococcus simulans isolated from Finnish patients. UsingS. pyogenes ATCC 12351 as reference strain the developed method was evaluated by reproducibility measurements and using parameters typically employed for screening methods,i.e. signal-to-background, signal-to-noise and a screening-window coefficient, the Z’ factor. The method was further used for screening a group of natural compounds and their synthetic derivatives against resistant bacterial strains. Of these, octyl and dodecyl gallates, and usnic and ursolic acids were the most active. The described method is a rapid, homogeneous, cost-effective and easy-to-perform system for screening of new potential antimicrobial agents in drug discovery.


Ursolic Acid Baicalin Usnic Acid Acacetin Bergenin 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



colony-forming units






screening-window coefficient


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Copyright information

© Institute of Microbiology, Academy of Sciences of the Czech Republic 2005

Authors and Affiliations

  • K. Kreander
    • 1
  • P. Vuorela
    • 1
    • 2
  • P. Tammela
    • 1
    • 3
  1. 1.Drug Discovery and Development Technology Center, Faculty of PharmacyUniversity of HelsinkiHelsinkiFinland
  2. 2.Department of Biochemistry and PharmacyÅbo Akademi UniversityTurkuFinland
  3. 3.Division of Pharmaceutical Biology, Faculty of PharmacyUniversity of HelsinkiHelsinkiFinland

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