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White Light-Activated Antimicrobial Paint using Crystal Violet.

Gi Byoung Hwang1, Elaine Allan2, Ivan P Parkin1

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ACS Applied Materials & Interfaces
|October 20, 2015
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Summary
This summary is machine-generated.

White-light-activated antimicrobial paint (WLAAP) containing crystal violet (CV) effectively kills bacteria like Escherichia coli. This novel paint shows potent photobactericidal activity, significantly reducing healthcare-associated infections in healthcare settings.

Keywords:
E. coli bacteriaacrylic latexcrystal violetwater contact anglewhite light-activated antimicrobial paint

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Area of Science:

  • Materials Science
  • Microbiology
  • Antimicrobial Technology

Background:

  • Healthcare-associated infections (HAIs) pose a significant threat, necessitating novel antimicrobial strategies.
  • Crystal violet (CV) is a known antimicrobial agent, but its integration into durable, light-activated materials requires investigation.

Purpose of the Study:

  • To develop and evaluate a white-light-activated antimicrobial paint (WLAAP) incorporating crystal violet (CV).
  • To assess the antimicrobial efficacy of WLAAP against Escherichia coli, a common cause of HAIs.
  • To determine the influence of CV concentration and white light exposure on WLAAP's bactericidal activity.

Main Methods:

  • Acrylic latex was formulated with varying concentrations of CV to create WLAAP.
  • Water contact angle measurements were performed to assess surface properties.
  • Leaching tests were conducted to evaluate CV stability over 120 hours.
  • Polyurethane samples coated with WLAAP were exposed to Escherichia coli in dark and white light conditions.
  • Bacterial viability was quantified after specific exposure times to determine antimicrobial efficacy.

Main Results:

  • WLAAP exhibited increasing water contact angle with higher CV concentrations, indicating altered surface hydrophobicity.
  • Minimal CV leaching (<0.03%) was observed over 120 hours, suggesting good material stability.
  • WLAAP demonstrated dose-dependent bactericidal activity against Escherichia coli in the dark.
  • Potent photobactericidal activity was observed under white light, with significant enhancement compared to dark conditions (P < 0.05).
  • At the highest CV concentration (1000 ppm), bacterial numbers fell below detection limits (<10(3) CFU/mL) after 6 hours of white light exposure.
  • The difference in log reduction between light and dark conditions increased with CV concentration, reaching over 1.8 log at 1000 ppm.

Conclusions:

  • WLAAP is a stable and effective antimicrobial material with enhanced efficacy under white light.
  • The photobactericidal activity of WLAAP presents a promising approach for reducing HAIs in healthcare environments.
  • Further development and application of WLAAP could significantly improve infection control in clinical settings.