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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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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...
476
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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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...
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Methods of Classification and Identification01:28

Methods of Classification and Identification

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Bacterial identification relies on a diverse array of techniques to classify and understand microorganisms, each tailored to uncover specific characteristics. Traditional morphological approaches, while still valuable, are limited for closely related or structurally simple organisms. Modern methods integrate biochemical, serological, genetic, and advanced molecular tools to achieve greater accuracy.Morphological and Biochemical TechniquesMorphological characteristics, such as cell shape and...
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MALDI-TOF Mass Spectrometry01:19

MALDI-TOF Mass Spectrometry

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Mass spectrometry is a powerful characterization technique that can identify and separate a wide variety of compounds ranging from chemical to biological entities, based on their mass-to-charge ratio (m/z). The instruments that allow this detection, known as mass spectrometers, have three components: an ion source, a mass analyzer, and a detector. These spectrometers differ based on the nature of their ion source and analyzers.
Matrix-assisted laser desorption ionization (MALDI) is a commonly...
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Updated: Aug 2, 2025

Rapid Antimicrobial Susceptibility Testing by Stimulated Raman Scattering Imaging of Deuterium Incorporation in a Single Bacterium
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Rapid Identification of Pathogens Causing Bloodstream Infections by Raman Spectroscopy and Raman Tweezers.

Katarina Rebrosova1, Silvie Bernatová2, Martin Šiler2

  • 1Department of Microbiology, Faculty of Medicine of Masaryk University, St. Anne's University Hospital, Brno, Czech Republic.

Microbiology Spectrum
|April 20, 2023
PubMed
Summary
This summary is machine-generated.

Raman spectroscopy offers a rapid, accurate, and cost-effective method for identifying bloodstream infection pathogens. This technique, combined with optical tweezers, analyzes microbes directly in human serum for near real-time diagnostics.

Keywords:
CandidaRaman spectroscopyRaman tweezersbacteriabloodstream infectionsdiagnosticssepsis

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Area of Science:

  • Clinical microbiology
  • Spectroscopy
  • Biophysics

Background:

  • Bloodstream infections are a leading cause of hospitalization and mortality.
  • Timely identification of causative agents is crucial for effective patient therapy.
  • Current diagnostic methods often lack speed, accuracy, or cost-effectiveness.

Purpose of the Study:

  • To evaluate Raman spectroscopy for identifying microbial pathogens causing bloodstream infections.
  • To assess the accuracy and speed of Raman spectroscopy for microbial identification.
  • To explore the combination of Raman spectroscopy with optical tweezers for direct analysis in biological samples.

Main Methods:

  • Raman spectroscopy was used to identify 305 microbial strains from 28 species causing bloodstream infections.
  • Support vector machine algorithm with principal-component analyses was employed for strain identification.
  • Raman spectroscopy was coupled with optical tweezers for capturing and analyzing individual microbial cells directly from spiked human serum.

Main Results:

  • Raman spectroscopy achieved high accuracy in identifying microbial strains from colonies, with misidentification rates of 2.8% and 7% depending on the analysis algorithm.
  • The combined Raman spectroscopy and optical tweezers method demonstrated the ability to capture and characterize individual microbial cells directly in human serum.
  • Notable spectral differences were observed among different microbial species when analyzed directly in serum.

Conclusions:

  • Raman spectroscopy is a promising, reliable, rapid, and inexpensive method for identifying bloodstream infection pathogens.
  • The integration of Raman spectroscopy with optical tweezers offers a novel approach for real-time microbial analysis directly in liquid samples.
  • This technology has the potential to become a valuable diagnostic tool for clinical microbiology.