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Gold Bulletin

, Volume 52, Issue 1, pp 51–60 | Cite as

Surface plasmon resonance of naked gold nanoparticles for photodynamic inactivation of Escherichia coli

  • Sahar Mohammadpour Lashkari
  • Hasan KariminezhadEmail author
  • Nazanin Safarnezhad
  • Hossein Amani
Original Paper

Abstract

Although antimicrobial photothermal inactivation of naked gold nanostructures using powerful pulsed lasers has been previously studied, there are little reports about their photodynamic antimicrobial properties under the irradiation of low-power density continuous wave lasers. Therefore, this paper attempts to fill this gap. In this paper, we studied the effects of a 40-mW/cm2 continuous Nd:Yag laser at 532 nm and naked gold nanoparticles on inactivation of Escherichia coli ATCC25922. According to our results, 60 min illumination using the Nd:Yag laser caused a 0.15log reduction of the bacterial viability. Also, the employed gold nanoparticles with an average size of 15 nm were toxic to E. coli ATCC 25922 in the concentrations above 0.5 μg/ml. In addition, synergistic effects of 0.5 μg/ml gold nanoparticles and the light illumination led to a 2.43log reduction of the viability after a 60-min exposure and did not show any considerable temperature change on the media. The obtained results were justified based on the possible interaction mechanisms of low-power density laser lights and naked gold nanoparticles. The paper is proposed as a prelude for future research about localized inactivation of resistant pathogens with minimum side effects on neighbor tissues.

Keywords

Photodynamic inactivation Surface plasmon resonance Low-power density laser Gold nanoparticles 

Notes

Acknowledgments

This work was supported by the Babol Noshirvani University of Technology (grant number is BNUT/370542/97).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Human and Animal Rights and Informed Consent

This paper does not contain any studies with human participants or animals performed by any of the authors. Informed consent was obtained from all individual participants included in the study.

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Sahar Mohammadpour Lashkari
    • 1
  • Hasan Kariminezhad
    • 1
    Email author
  • Nazanin Safarnezhad
    • 1
  • Hossein Amani
    • 2
  1. 1.Department of Physics, Faculty of Basic SciencesBabol Noshirvani University of TechnologyBabolIran
  2. 2.Department of Chemical EngineeringBabol Noshirvani University of TechnologyBabolIran

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