Among the individual substances,
sanguinarine (MIC 4 mg/ml), followed by thymoquinone, capsaicin, trans-2-hexenal and
nordihydroguaiaretic acid (MIC 4–32 mg/ml) possessed the strongest antibacterial effect.
In case of extracts, common hop (Humulus lupulus L.) and myrtle (Myrtus communis L.)
methanolic-dichloromethane extracts exhibited the highest growth-inhibitory effect with
MICs ranging from 2 to 8mg/ml.