I am currently working on differently coated titanium disks in order to investigate any antimicrobial/bacteriostatic effect. Taking a cue from the literature, I'm incubating the disks with a known concentration of bacteria for 8 and 24 hours (in order to allow biofilm formation), then I gently wash and sonicate them. This procedure allows detaching adherent bacteria that formed a biofilm on the surfaces, and the medium in which the disks have been sonicated is used to count CFU on agar plates.

Overall this procedure seems to work, but now I have an issue: the coating I'm testing now detaches from the titanium, even with a weak vortex. The coating is not soluble and thus does not spread in agar, so I can't apply a modified Muller-Hinton test and I don't have the possibility to read absorbance after colorimetric assay, nor special microscopes.

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