Table 3.

Minimum quorum sensing inhibitory concentrations, including the half maximal inhibitory concentration (IC₅₀) and antibiofilm (ABF) activities of extracts, tested on Staphylococcus epidermidis (for anti-quorum activity) and Chromobacterium violaceum (for anti-biofilm activity) models.

Plant/Organ	Solvent	Anti-Quorum Activity (mg/mL)		Anti-Biofilm Activity (%)
		MQSIC	IC50	Prevention	Eradication
RL	70% EtOH	>1.25	0.43	+	+
	80% MeOH	>1.25	0.41	++	+
RF	70% EtOH	0.63	0.04	++	+
	80% MeOH	0.16	0.04	+	+

RL—Robinia pseudoacacia leaf extract, RF—Robinia pseudoacacia flower extract; (++) good ABF activity (>50% Inhibition); (+) poor ABF activity (more than 0 to 50% inhibition); (-) no ABF activity (0% or less). MQSIC = Minimum quourm sensing inhibitory concentration; IC₅₀ = Half maximal inhibitory concentration.