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Related Concept Videos

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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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...
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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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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Visualizing cell state transition using Raman spectroscopy.

Taro Ichimura1, Liang-da Chiu2, Katsumasa Fujita2

  • 1Quantitative Biology Center, Riken, Suita, Osaka, Japan.

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|January 11, 2014
PubMed
Summary

Raman spectroscopy offers a non-invasive way to understand cell states by analyzing spectral fingerprints. This method distinguishes cell types and tracks differentiation, revealing crucial insights into cellular dynamics without cell disruption.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Spectroscopy

Background:

  • Understanding cell state is crucial for systems biology, typically requiring protein expression analysis and cell disruption.
  • Non-invasive methods are needed for comprehensive single-cell analysis without altering cellular integrity.

Purpose of the Study:

  • To investigate Raman spectroscopy as a non-invasive, single-cell technique for characterizing and distinguishing cellular states.
  • To demonstrate Raman spectroscopy's ability to detect subtle cell state changes during differentiation and self-renewal.

Main Methods:

  • Utilized label-free Raman spectroscopy for single-cell analysis of cytosol and nucleus.
  • Applied principal component analysis (PCA) to visualize cell state transitions during differentiation.
  • Compared spectral morphology across different cell lines, including embryonic stem cells (ESCs) and differentiated cells.

Main Results:

  • Raman spectra showed significant differences between cell lines, reflecting distinct cell states.
  • Detected subtle cell state changes before and after differentiation induction in neuroblastoma and adipocytes.
  • Visualized gradual cell state transitions during ESC differentiation using Raman spectroscopy and PCA.
  • Observed greater cell diversity in undifferentiated stem cells compared to terminally differentiated cells, indicating stochastic fluctuations during self-renewal.

Conclusions:

  • Raman spectral morphology, combined with PCA, can establish unique cellular fingerprints.
  • This approach is effective for distinguishing and identifying diverse cellular states non-invasively.
  • Provides a powerful tool for studying cell state dynamics and heterogeneity.