Impact of various essential oils or their pure components on the corrosion resistance and microbicidal properties of chitosan-based coatings - replication data

Novel chitosan coatings incorporating antibacterial additives including essential oils (cinnamon bark, cinnamon leaf and thyme) or their constituents (cinnamaldehyde, eugenol, thymol and carvacrol) were electrophoretically deposited on titanium. The electrokinetic characteristics of the emulsions and deposition parameters were determined. The increase in additive concentration in the emulsion led to obtaining of coatings with poor adherence to the substrate. The coatings contained droplets of additives scattered relatively homogenously in the chitosan matrix. The amount and dimension of droplets were affected by the content of additive in the emulsion. It was found that all of the additives had an impact on chitosan, as they formed new intermolecular hydrogen bonds. The roughness and wettability of the coatings were significantly affected by the concentration of additives in the dispersed systems. Electrochemical studies confirmed that all of the investigated coatings improved resistance to corrosion compared to the bare titanium substrate. The coatings had different bactericidal factors with respect to the additive used. Mostly they acted stronger against Staphylococcus aureus compared to the Escherichia coli bacteria. All coatings had a high cytotoxicity factor against both the MG-63 and FaDu cell lines. Nevertheless, they are very promising for applications that require high antimicrobial performance.