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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

2.6K
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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Raman Spectroscopy Instrumentation: Overview01:26

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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...
1.8K

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Rejection of Fluorescence Background in Resonance and Spontaneous Raman Microspectroscopy
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Raman spectroscopy as an analytical tool for melanoma research.

E Brauchle1, S Noor, E Holtorf

  • 1Fraunhofer Institute for Interfacial Engineering and Biotechnology (IGB), Stuttgart, Germany; University Women's Hospital Tuebingen, Eberhard Karls University Tuebingen, Tuebingen, Germany; University of Stuttgart, Institute for Interfacial Engineering and Plasma Technology (IGVP), Stuttgart, Germany.

Clinical and Experimental Dermatology
|June 18, 2014
PubMed
Summary

Raman spectroscopy can noninvasively distinguish melanoma cells from normal cells and identify specific cell death types. This technique also predicts melanoma cell susceptibility to anticancer drugs, aiding in personalized treatment strategies.

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Area of Science:

  • Biophotonics
  • Cellular spectroscopy
  • Cancer diagnostics

Background:

  • Raman spectroscopy offers noninvasive cellular analysis by revealing molecular composition.
  • It functions as an optical screening technology for living cells.

Purpose of the Study:

  • To differentiate melanoma cells from melanocytes.
  • To identify drug-induced melanoma cell death stages (apoptosis, necrosis, autophagy).
  • To assess melanoma cell susceptibility to anticancer therapies.

Main Methods:

  • Raman spectroscopy was applied to normal and melanoma cells, including wild-type (WT) and mutant variants.
  • Principal component analysis was used to analyze spectral data.
  • Specific inducers were used to trigger distinct cell death pathways.

Main Results:

  • Raman spectroscopy successfully distinguished melanocytes from melanoma cells.
  • WT melanoma cells were differentiated from those with BRAF or NRAS mutations.
  • Distinct cell death types (apoptosis, necrosis, autophagy) were identified, correlating with immunoblotting results.
  • Melanoma cell line susceptibility to high-dose ascorbate was discriminated.

Conclusions:

  • Raman spectroscopy is a potent noninvasive method for distinguishing melanocytes from melanoma cells.
  • The technique accurately analyzes specific melanoma cell death types.
  • It can predict melanoma cell response to anticancer drugs, supporting therapeutic decisions.