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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

974
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...
974
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

672
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...
672

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Related Experiment Video

Updated: Nov 21, 2025

Combining Raman Imaging and Multivariate Analysis to Visualize Lignin, Cellulose, and Hemicellulose in the Plant Cell Wall
07:51

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

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Multivariate Raman mapping for phenotypic characterization in plant tissue sections.

Ingrid Liedtke1, Sabrina Diehn1, Zsuzsanna Heiner2

  • 1Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489 Berlin, Germany.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|January 18, 2021
PubMed
Summary
This summary is machine-generated.

Raman microspectroscopy revealed biochemical variations in cucumber (Cucumis sativus) cell walls, distinguishing individuals and growth conditions. This technique offers new insights into plant tissue heterogeneity and biomineralization processes.

Keywords:
Cucumis sativus (cucumber)Raman microspectroscopyhierarchical cluster analysis (HCA)plant cell wallprincipal component analysis (PCA)silicatissue sectionsxylem

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Label-free in situ Imaging of Lignification in Plant Cell Walls
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Area of Science:

  • Plant Biology
  • Biochemistry
  • Spectroscopy

Background:

  • Characterizing biochemical variation in plant tissues is crucial for understanding genetic and environmental influences.
  • Plant cell walls exhibit spectral differences due to genetic, environmental, and microscopic factors.
  • Individual variation and histological heterogeneity can obscure subtle spectral changes.

Purpose of the Study:

  • To investigate biochemical variation in cucumber (Cucumis sativus) plant tissues using Raman microspectroscopy.
  • To assess spectral variations related to tissue origin, histological substructures, and individual differences.
  • To discriminate between plant tissues grown under different conditions, specifically with and without silicic acid.

Main Methods:

  • Raman microspectroscopic mapping of ~168,000 spectra from leaf, stem, and root tissues of 56 cucumber plants.
  • Multivariate analysis, including principal component analysis (PCA), to analyze spectral data.
  • Spatial mapping of spectral data to correlate biochemical composition with tissue structure and origin.

Main Results:

  • Significant variation in cell wall composition was identified across different cucumber individuals and tissue types.
  • PCA-based classification successfully discriminated between spectra from different individuals and growth conditions.
  • Spectral differences indicated variations in carotenoids and hydroxycinnamic acids, particularly in response to silicic acid treatment.

Conclusions:

  • Raman microspectroscopy effectively reveals biochemical heterogeneity in plant tissues.
  • The study provides insights into cell wall composition differences influenced by genetics and environmental factors (silicic acid).
  • Vibrational spectroscopy is a valuable tool for studying plant biomineralization and biochemical processes.