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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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.
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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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Related Experiment Video

Updated: Jul 19, 2026

Rapid Antimicrobial Susceptibility Testing by Stimulated Raman Scattering Imaging of Deuterium Incorporation in a Single Bacterium
12:08

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Published on: February 14, 2022

Studying bacterial metabolic states using Raman spectroscopy.

Maria Fernanda Escoriza1, Jeanne M Vanbriesen, Shona Stewart

  • 1Department of Civil and Environmental Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA. mfe@andrew.cmu.edu

Applied Spectroscopy
|September 28, 2006
PubMed
Summary

Raman spectroscopy effectively tracks bacterial metabolic shifts during growth phases in Escherichia coli and Staphylococcus epidermidis. This technique can distinguish between different growth stages, including cell decay, indicating potential for assessing bacterial viability.

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Last Updated: Jul 19, 2026

Rapid Antimicrobial Susceptibility Testing by Stimulated Raman Scattering Imaging of Deuterium Incorporation in a Single Bacterium
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An Integrated Raman Spectroscopy and Mass Spectrometry Platform to Study Single-Cell Drug Uptake, Metabolism, and Effects
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An Integrated Raman Spectroscopy and Mass Spectrometry Platform to Study Single-Cell Drug Uptake, Metabolism, and Effects

Published on: January 9, 2020

Area of Science:

  • Microbiology
  • Biophysics
  • Spectroscopy

Background:

  • Bacterial growth phases exhibit distinct metabolic profiles.
  • Understanding these metabolic changes is crucial for controlling microbial processes.
  • Raman spectroscopy offers a non-destructive method for analyzing cellular components.

Purpose of the Study:

  • To investigate metabolic variability in Escherichia coli and Staphylococcus epidermidis during different growth phases using Raman spectroscopy.
  • To identify spectral changes correlated with specific metabolic states (lag, exponential, stationary, decay).
  • To evaluate the potential of Raman spectroscopy for classifying bacterial growth phases and assessing cell viability.

Main Methods:

  • Batch cultures of E. coli and S. epidermidis were monitored using standard plate counts to define growth phases.
  • Raman spectroscopy was employed to collect spectral data from cells at different growth stages.
  • Principal Component Analysis (PCA) and discriminant analysis were used to analyze spectral variations and classify growth phases.

Main Results:

  • Spectral intensity variations, particularly for DNA and RNA bands, correlated with metabolic activity across growth phases.
  • Maximum spectral intensities were observed during the exponential phase, while minimum intensities occurred during decay.
  • Spectral data showed high consistency across multiple growth cycles for both bacterial species.
  • Decay phase spectra were spectrally distinct and clustered together, separating them from other growth phases.

Conclusions:

  • Raman spectroscopy is a viable tool for studying bacterial metabolic states.
  • The technique can differentiate between various bacterial growth phases, including the decay phase.
  • Raman spectroscopy shows promise for non-invasively assessing bacterial cell viability.