Essential oils are effective as alternative biocide molecules, but they are currently not used against bacterialcontamination of surfaces for biomedical, industrial or everyday life applications.In this work, the grafting of peppermint oil to a chemically-treated titanium alloy is explored as a coating orthrough functionalization (soaking in an ethanol solution of the oil); a procedure for a proper characterization ofthis type of materials is here suggested.A homogeneous and continuous coating is obtained by polymerization of the oil on the titanium surface, asshown byfluorescence observation. It contains a prevalence of oxygenated compounds (gas-chromatographic,XPS and FTIR analysis), has a hydrophobic behavior (contact angle test and zeta potential titration) and showsstrong adhesion to the substrate (tape test).On the functionalized samples, the presence of non-oxygenated grafted compounds was detected (gas-chro-matographic, XPS analysis) without the formation of a coating (fluorescent observation). The characteristics ofthe substrate combined to the selected functionalization procedure are selective towards grafting of specificcompounds even if they are minority fractions in the source peppermint oil. The coating has a bacteriostaticeffect on adherent bacteria, which is lower on the functionalized samples

Grafting of the peppermint essential oil to a chemically treated Ti6Al4V alloy to counteract the bacterial adhesion. [*G. Banche and S. Spriano contributed equally to this work]

Allizond V.;Bertea C. M.;Bistolfi A.;Cuffini A. M.;Banche G.
Co-last
;
2019

Abstract

Essential oils are effective as alternative biocide molecules, but they are currently not used against bacterialcontamination of surfaces for biomedical, industrial or everyday life applications.In this work, the grafting of peppermint oil to a chemically-treated titanium alloy is explored as a coating orthrough functionalization (soaking in an ethanol solution of the oil); a procedure for a proper characterization ofthis type of materials is here suggested.A homogeneous and continuous coating is obtained by polymerization of the oil on the titanium surface, asshown byfluorescence observation. It contains a prevalence of oxygenated compounds (gas-chromatographic,XPS and FTIR analysis), has a hydrophobic behavior (contact angle test and zeta potential titration) and showsstrong adhesion to the substrate (tape test).On the functionalized samples, the presence of non-oxygenated grafted compounds was detected (gas-chro-matographic, XPS analysis) without the formation of a coating (fluorescent observation). The characteristics ofthe substrate combined to the selected functionalization procedure are selective towards grafting of specificcompounds even if they are minority fractions in the source peppermint oil. The coating has a bacteriostaticeffect on adherent bacteria, which is lower on the functionalized samples
378
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13
http://www.journals.elsevier.com/surface-and-coatings-technology/
Antibacterial effect; Coating; Essential oils; Functionalization; Titanium
Cazzola M.; Ferraris S.; Allizond V.; Bertea C.M.; Novara C.; Cochis A.; Geobaldo F.; Bistolfi A.; Cuffini A.M.; Rimondini L.; Banche G.*; Spriano S*.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1716249
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