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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

468
The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
468
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

465
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
465
Antimicrobial Effectiveness01:28

Antimicrobial Effectiveness

50
The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...
50

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Updated: Jul 23, 2025

Rapid Antimicrobial Susceptibility Testing by Stimulated Raman Scattering Imaging of Deuterium Incorporation in a Single Bacterium
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Antimicrobial Resistance Studies Using Raman Spectroscopy on Clinically Relevant Bacterial Strains.

Saumya Singh1, Taru Verma2, Balaram Khamari3

  • 1Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, Karnataka, India.

Analytical Chemistry
|July 18, 2023
PubMed
Summary
This summary is machine-generated.

Raman spectroscopy offers a rapid method to detect antibiotic resistance in bacteria like E. coli. This technique differentiates resistant from sensitive strains by analyzing spectral changes, aiding timely diagnosis and treatment.

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Area of Science:

  • Spectroscopy
  • Microbiology
  • Antimicrobial Resistance

Background:

  • Antibiotic-resistant bacteria pose a growing global health threat.
  • Conventional diagnostic methods for antibiotic resistance are slow and resource-intensive.
  • Rapid detection is crucial for effective antibiotic therapy and infection control.

Purpose of the Study:

  • To evaluate Raman spectroscopy as a rapid surveillance technology for antibiotic resistance.
  • To differentiate antibiotic-resistant and -sensitive clinical isolates of *Escherichia coli*, *Acinetobacter baumannii*, and *Enterobacter* species.

Main Methods:

  • Collected Raman spectra from bacterial isolates with and without antibiotic exposure (ciprofloxacin, gentamicin, meropenem, nitrofurantoin).
  • Analyzed spectral changes in DNA, protein, and lipid bands.
  • Utilized partial least-squares (PLS) analysis for biomarker validation.

Main Results:

  • Distinct spectral changes observed in sensitive strains upon exposure to different antibiotics.
  • Antibiotic-resistant strains exhibited opposite spectral patterns compared to sensitive strains.
  • Raman spectral data showed strong correlation with antimicrobial susceptibility testing results.

Conclusions:

  • Raman spectroscopy can effectively differentiate antibiotic-resistant from antibiotic-sensitive bacteria.
  • This technique shows significant potential for rapid detection and surveillance of antimicrobial resistance.
  • Further development could lead to faster clinical diagnostics for bacterial infections.