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Antimicrobial Effects of Chemically Functionalized and/or Photo-Heated Nanoparticles

Thermo-Plasmonic Killing of Escherichia coli TG1 Bacteria

CNR-Lab. Licryl, Institute NANOTEC, 87036 Arcavacata di Rende, Italy
Department DiBEST (Biology, Ecology and Earth Sciences), University of Calabria, 87036 Arcavacata di Rende, Italy
Department of Physics, University of Calabria, Arcavacata di Rende, 87036 Cosenza, Italy
CNR-IPCF, National Research Council of Italy, Institute for Physical and Chemical Processes-Bari Division, Via Orabona 4, I-70126 Bari, Italy
Department of Chemistry, “A. Moro” University of Bari, Via Orabona 4, I-70126 Bari, Italy
Department of Medico-surgical Sciences and Biotechnologies, Sapienza University of Rome, Corso della Repubblica 79, 04100 Latina, Italy
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Materials 2019, 12(9), 1530;
Received: 21 March 2019 / Revised: 27 April 2019 / Accepted: 6 May 2019 / Published: 10 May 2019
(This article belongs to the Special Issue Photothermal Therapy of Nanomaterials)
Plasmonic photo-thermal therapy (PPTT) is a minimally invasive, drug-free, therapy based on the properties of noble metal nanoparticles, able to convert a bio-transparent electromagnetic radiation into heat. PPTT has been used against cancer and other diseases. Herein, we demonstrate an antimicrobial methodology based on the properties of gold nanorods (GNRs). Under a resonant laser irradiation GNRs become highly efficient light to heat nano-converters extremely useful for PPTT applications. The concept here is to assess the antimicrobial effect of easy to synthesize, suitably purified, water-dispersible GNRs on Escherichia coli bacteria. A control on the GNRs concentration used for the process has been demonstrated critical in order to rule out cytotoxic effects on the cells, and still to be able to generate, under a near infrared illumination, an adequate amount of heat suited to increase the temperature up to ≈50 °C in about 5 min. Viability experiments evidenced that the proposed system accomplished a killing efficiency suitable to reducing the Escherichia coli population of about 2 log CFU (colony-forming unit). View Full-Text
Keywords: nanomaterials; plasmonics; bacteria disinfection; photothermal effects; optics nanomaterials; plasmonics; bacteria disinfection; photothermal effects; optics
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MDPI and ACS Style

Annesi, F.; Pane, A.; Losso, M.A.; Guglielmelli, A.; Lucente, F.; Petronella, F.; Placido, T.; Comparelli, R.; Guzzo, M.G.; Curri, M.L.; Bartolino, R.; De Sio, L. Thermo-Plasmonic Killing of Escherichia coli TG1 Bacteria. Materials 2019, 12, 1530.

AMA Style

Annesi F, Pane A, Losso MA, Guglielmelli A, Lucente F, Petronella F, Placido T, Comparelli R, Guzzo MG, Curri ML, Bartolino R, De Sio L. Thermo-Plasmonic Killing of Escherichia coli TG1 Bacteria. Materials. 2019; 12(9):1530.

Chicago/Turabian Style

Annesi, Ferdinanda, Alfredo Pane, Maria A. Losso, Alexa Guglielmelli, Fabrizio Lucente, Francesca Petronella, Tiziana Placido, Roberto Comparelli, Maria G. Guzzo, Maria L. Curri, Roberto Bartolino, and Luciano De Sio. 2019. "Thermo-Plasmonic Killing of Escherichia coli TG1 Bacteria" Materials 12, no. 9: 1530.

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