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Detection and Classification of Bacterial Cells After Centrifugation and Filtration of Liquid Specimens Using Laser-Induced Breakdown Spectroscopy.

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Related Experiment Video

Updated: Sep 21, 2025

Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
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Silver Microparticle-Enhanced Laser-Induced Breakdown Spectroscopy.

Jeremy C Marvin1, Emma J Blanchette1, Sydney C Sleiman1

  • 1Department of Physics, 8637University of Windsor, Windsor, ON, Canada.

Applied Spectroscopy
|May 31, 2022
PubMed
Summary
This summary is machine-generated.

Adding silver microparticles to bacterial samples significantly enhances laser-induced breakdown spectroscopy (LIBS) signals. This method improves the detection of elements in bacterial cells and the nitrocellulose filter medium.

Keywords:
E. coliLIBSLaser-induced breakdown spectroscopybacteriafiltration mediummicroparticlessilver

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • Laser-induced breakdown spectroscopy (LIBS) is a powerful technique for elemental analysis.
  • Enhancing LIBS signal intensity is crucial for improving detection limits and accuracy.
  • Microparticles have been explored as potential agents to enhance LIBS signals.

Purpose of the Study:

  • To investigate the effect of silver microparticles on LIBS atomic emission spectra of bacterial cells.
  • To quantify the enhancement in emission intensity when using silver microparticles.
  • To assess the utility of silver microparticles for bacterial analysis using LIBS.

Main Methods:

  • A deposition chamber was used to uniformly coat nitrocellulose filters with silver microparticles (10-100 μg).
  • Bacterial samples (E. coli, M. smegmatis, E. cloacae) were deposited on both coated and blank filters.
  • LIBS spectra were acquired using single-shot 1064 nm laser pulses.

Main Results:

  • A significant enhancement in emission intensity was observed for all detected elements in bacterial LIBS spectra when using silver microparticles.
  • Average enhancement ratios ranged from 1.2 (carbon) to 5.3 (calcium), with an overall average enhancement of 4.3.
  • Carbon emission from the nitrocellulose filter also showed enhancement, indicating a broader effect of the microparticles.

Conclusions:

  • Silver microparticles effectively enhance LIBS signal intensity for bacterial analysis.
  • This enhancement improves the detection of elemental composition in bacterial samples.
  • The use of silver microparticles presents a promising strategy for improving LIBS sensitivity and applicability in microbiology.