Fig. 2. Antibacterial activity of tested compounds after 2 h of contact time.

Results are expressed as the logarithm of reduction, i.e., the Log₁₀ of the ratio of viable bacteria counted between the compounds-treated conditions and the sterile distilled water-treated condition (negative control). SLS: Sodium Laureth Sulfate ; CARR: Carrageenan ; GUAR: Guar Hydroxypropyltrimonium Chloride ; SH: Sodium Hyaluronate ; RHM: Rhamnolipids ; VF: Vitreoscilla filiformis extract. Error bars show standard error of the mean (SEM) of independent treatments (n ≥ 3). Statistical significance was calculated by a paired t-test. (*) for p < 0.05, (**) for p < 0.01 and (***) for p < 0.001.