2.5. Biofilm formation assay
For biofilm quantification, a micro method based on a protocol
previously reported was employed[29]. Biofilms formed after 24 h
incubation of bacterial cultures prepared as described in the previous paragraph, were stained with 20lL of an aqueous solution of
crystal violet (0.1%, w/v) for 20 min. After washing with water,
the liquid was discarded from the wells and the material that
remained fixed to the polystyrene (containing bio-film) was
washed with PBS (thrice). Crystal violet bound to biofilm was