Testing the antimicrobial properties of an upcoming “ environmental-friendly” family of ionic liquids

摘要

AbstractThe antimicrobial activity of a family of ionic liquids (discrete and polymerized) based on the [2-(methacryloyloxy)ethyl]dimethylheptyl ammonium cation and a series of anions, bis(trifluoromethylsulfonyl)-imide, nonafluoro-1-butanesulfonate, dodecylbenzenesulfonate, heptadecafluorooctanesulfonate, 4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,11-heptadecafluoro-undecanoate and decanesulfonate, was explored for potential application in the field of conservation of Cultural Heritage.The bio-activity was tested on four microbial strains isolated from deteriorated monuments: one Gram Negative bacterial strainStenotrophomonas maltophiliaBC656, one Gram Positive bacterial speciesMicrococcus luteusBC657, one black yeastAureobasidium pullulansMC852 and one dematiaceous hyphomycetesCladosporiumsp. MC853.Diffusion Agar tests show that the bio-activity for this series of ILs is mainly determined by the anion lipophilicity, although the role of cations may be also envisaged. The dodecylbenzenesulfonate based IL shows the most significant antimicrobial activity with an efficiency against the Gram Positive strainMicrococcus luteushigher than that of Preventol?80 and Rocima?103 used as standards. The corresponding dodecylbenzenesulfonate polyionic liquid do not display both antibacterial and antifungal activity. This behavior is explained in terms of strongest electrostat