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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

324
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...
324
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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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...
297

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Raman Spectroscopic Analysis of Steviol Glycosides: Spectral Database and Quality Control Algorithms.

Giuseppe Pezzotti1,2,3,4,5,6,7, Wenliang Zhu1, Takashi Aoki8

  • 1Ceramic Physics Laboratory, Kyoto Institute of Technology, Sakyo-ku, Matsugasaki, Kyoto 606-8585, Japan.

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Summary
This summary is machine-generated.

Raman spectroscopy can quantify diterpene glycoside mixtures from Stevia rebaudiana, enabling better control over sweetness and bitter aftertaste in natural sweeteners. This technique aids in optimizing stevia product quality and taste profiles.

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Raman databaseRaman spectroscopyquality control algorithmssteviol glycosides

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Area of Science:

  • * Agricultural Chemistry
  • * Analytical Chemistry
  • * Biochemistry

Background:

  • * Stevia rebaudiana diterpene glycosides offer high sweetening power and health benefits but possess a bitter aftertaste.
  • * Controlling the organoleptic properties of steviol glycosides is crucial for their wider adoption.
  • * Understanding structure-property relationships is key to optimizing stevia-based sweeteners.

Purpose of the Study:

  • * To develop Raman spectroscopic algorithms for quantitative characterization of stevia sweetener products.
  • * To establish a comprehensive Raman spectral library for high-purity diterpene glycosides.
  • * To assess the organoleptic properties of commercial stevia samples.

Main Methods:

  • * High-resolution Raman spectroscopy was used to analyze twelve purified diterpene glycosides.
  • * A Raman spectral library was created for diterpene glycoside molecular structures.
  • * Quantitative spectroscopic parameters were developed and applied to commercial stevia samples.

Main Results:

  • * Raman spectroscopy successfully differentiated and quantified various diterpene glycosides.
  • * Quantitative parameters were established for characterizing organoleptic properties.
  • * Commercial stevia samples were analyzed, including Rebaudioside M.

Conclusions:

  • * Raman spectroscopy is a versatile tool for quantitative quality control of stevia products.
  • * The developed method allows for prompt in situ characterization of stevia sweeteners.
  • * This technique supports processing optimization and control of taste profiles.