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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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...
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.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...

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Related Experiment Video

Updated: Jul 6, 2026

Combining Raman Imaging and Multivariate Analysis to Visualize Lignin, Cellulose, and Hemicellulose in the Plant Cell Wall
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Combining Raman Imaging and Multivariate Analysis to Visualize Lignin, Cellulose, and Hemicellulose in the Plant Cell Wall

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Cell wall investigations utilizing tip-enhanced Raman scattering.

C Budich1, U Neugebauer, J Popp

  • 1Institute for Analytical Sciences, Bunsen-Kirchoff-Str. 11, 44139 Dortmund, Germany.

Journal of Microscopy
|March 12, 2008
PubMed
Summary

Tip-enhanced Raman scattering (TERS) reveals Staphylococcus epidermidis cell wall structure with high resolution. This technique allows for controlled environmental conditions and precise signal collection for biological sample analysis.

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Published on: January 9, 2020

Area of Science:

  • Microscopy and Spectroscopy
  • Surface Science
  • Microbiology

Background:

  • Staphylococcus epidermidis is a common bacterium with a complex cell wall structure.
  • Understanding bacterial surface structure is crucial for developing targeted antimicrobial strategies.
  • High-resolution imaging techniques are needed to probe nanoscale details of bacterial cell walls.

Purpose of the Study:

  • To investigate the surface structure of Staphylococcus epidermidis using tip-enhanced Raman scattering (TERS).
  • To demonstrate the suitability of transmission TERS for analyzing biological samples under specific environmental conditions.
  • To provide guidelines for reproducible TERS instrument setup and data interpretation.

Main Methods:

  • Tip-enhanced Raman scattering (TERS) microscopy.
  • Transmission TERS setup optimized for biological samples.
  • Controlled environmental conditions for specimen analysis.
  • Instrument parameter optimization for reproducible field-enhancement.
  • Control experiments for signal validation.

Main Results:

  • TERS achieved high lateral resolution and chemical specificity in analyzing the Staphylococcus epidermidis cell wall.
  • The transmission TERS setup effectively collected signals from the field-enhancing probe.
  • Reproducible instrument setup parameters were identified for accurate field-enhancement estimation.
  • Control experiments were crucial for avoiding misinterpretation of TERS signals.

Conclusions:

  • TERS is a powerful technique for high-resolution, chemically specific analysis of bacterial cell walls.
  • The transmission TERS setup is well-suited for studying biological samples under controlled conditions.
  • Careful instrument calibration and control experiments are essential for reliable TERS analysis of microbial surfaces.