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Antimicrobial and antioxidant amphiphilic random copolymers to address medical device-centered infections

TitleAntimicrobial and antioxidant amphiphilic random copolymers to address medical device-centered infections
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2015
AuthorsTaresco, V., Crisante F., Francolini I., Martinelli A., D'Ilario L., Ricci-Vitiani L., Buccarelli M., Pietrelli L., and Piozzi A.
JournalActa Biomaterialia
Keywords2, 2-diphenyl-1-picrylhydrazyl, Anti-Infective Agents, antibiotic resistance, antifouling agent, antiinfective agent, antimicrobial activity, Antioxidant, antioxidant activity, Antioxidants, article, bacterium adherence, biocompatibility, biofilm, Biphenyl Compounds, biphenyl derivative, Calorimetry, catheter, Catheters, cationic charge density, cell death, Cell Line, chelating agent, Chelating Agents, Chemical parameters, chemistry, controlled study, copolymer, cytology, Cytotoxicity, device infection, devices, Differential Scanning, Differential scanning calorimetry, drug effects, Equipment and Supplies, erythrocyte, Erythrocytes, ferrous ion, fibroblast, Fibroblasts, hemoglobin, Hemoglobins, hemolytic test, human, Humans, hydrodynamics, hydroxylation, Hydroxytyrosol, ion, Ions, Iron, laboratory test, medical device, metabolism, microbial sensitivity test, Microbial Sensitivity Tests, microbiology, minimum inhibitory concentration, Molecular Weight, monomer, nonhuman, particle size, Picrates, picric acid, polymer, polymerization, Polymers, polymethacrylic acid derivative, priority journal, Prosthesis-Related Infections, Proton Magnetic Resonance Spectroscopy, proton nuclear magnetic resonance, quantitative analysis, quaternary ammonium derivative, reactive oxygen metabolite, risk reduction, Solubility, Staphylococcus epidermidis, Surface-Active Agents, surfactant, synthesis, tertiary amine, Water

Microbial biofilms are known to support a number of human infections, including those related to medical devices. This work is focused on the development of novel dual-function amphiphilic random copolymers to be employed as coatings for medical devices. Particularly, copolymers were obtained by polymerization of an antimicrobial cationic monomer (bearing tertiary amine) and an antioxidant and antimicrobial hydrophobic monomer (containing hydroxytyrosol, HTy). To obtain copolymers with various amphiphilic balance, different molar ratios of the two monomers were used. 1H NMR and DSC analyses evidenced that HTy aromatic rings are able to interact with each other leading to a supra-macromolecular re-arrangement and decrease the copolymer size in water. All copolymers showed good antioxidant activity and Fe2+ chelating ability. Cytotoxicity and hemolytic tests evidenced that the amphiphilic balance, cationic charge density and polymer size in solution are key determinants for polymer biocompatibility. As for the antimicrobial properties, the lowest minimal inhibitory concentration (MIC = 40 μg/mL) against Staphylococcus epidermidis was shown by the water-soluble copolymer having the highest HTy molar content (0.3). This copolymer layered onto catheter surfaces was also able to prevent staphylococcal adhesion. This approach permits not only prevention of biofilm infections but also reduction of the risk of emergence of drug-resistant bacteria. Indeed, the combination of two active compounds in the same polymer can provide a synergistic action against biofilms and suppress reactive species oxygen (ROS), known to promote the occurrence of antibiotic resistance. © 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.


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Citation KeyTaresco2015131