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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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Related Experiment Video

Updated: Sep 11, 2025

Non-contact, Label-free Monitoring of Cells and Extracellular Matrix using Raman Spectroscopy
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Starch granule oxidation evaluation using laser confocal microscope-Raman spectroscopy: A novel analytical method.

Xindong Xu1, Kaiyang Shi2, Ji Ma3

  • 1College of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China; Guangdong Provincial Key Laboratory of Intelligent Food Manufacturing, Foshan University, Foshan 528225, China; China-Singapore International Joint Research Institute, Guangzhou 510700, China.

Carbohydrate Polymers
|August 16, 2025
PubMed
Summary

A new laser confocal microscope-Raman spectroscopy (LCM-Raman) method rapidly analyzes oxidized starch

Keywords:
Analytical methodLaser confocal microscopeOxidized starchRaman spectroscopy

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Area of Science:

  • Food Science
  • Analytical Chemistry
  • Materials Science

Background:

  • Traditional methods for determining oxidized starch's total degree of oxidation (TDO) are time-consuming and complex.
  • Existing methods struggle to distinguish between intra- and inter-granule oxidation, hindering detailed studies.
  • Accurate assessment of starch oxidation is crucial for food applications.

Purpose of the Study:

  • To develop a rapid, non-destructive method for analyzing starch oxidation levels.
  • To visualize and quantify oxidation within and between starch granules.
  • To provide a tool for studying structural changes in oxidized starch.

Main Methods:

  • Utilized laser confocal microscope-Raman spectroscopy (LCM-Raman).
  • Extracted intensity values at 478 and 1401 cm⁻¹ from starch Raman spectra.
  • Employed map-scanning and line-scanning for visualization and homogeneity assessment.

Main Results:

  • Established a correlation factor (R₁₄₀₁/₄₇₈) for oxidation level.
  • Achieved high correlation (R² = 0.99327) between LCM-Raman and titration TDO.
  • Demonstrated an error within 3% compared to titration for commercial oxidized starches.

Conclusions:

  • LCM-Raman offers a rapid, accurate, and non-destructive method for assessing starch oxidation.
  • The technique allows for visualization of oxidation distribution at the granule scale.
  • This method provides a practical tool for in-depth studies of oxidized starch structures.