This protocol allows for a direct comparison between planktonic and biofilm resistance for a bacterial strain that can form a biofilm in vitro using a 96-well microtiter plate. Planktonic or biofilm bacteria are exposed to serial dilutions of the antimicrobial agent of choice. Viability is assayed by growth on agar plates.
Mah, T. Establishing the Minimal Bactericidal Concentration of an Antimicrobial Agent for Planktonic Cells (MBC-P) and Biofilm Cells (MBC-B). J. Vis. Exp. (83), e50854, doi:10.3791/50854 (2014).