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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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Classification of Titrimetric Analysis Based on Reaction Types01:01

Classification of Titrimetric Analysis Based on Reaction Types

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Titrimetric analysis in solution chemistry involves measuring the volume of solutions and is often called volumetric analysis. The standard solution of known concentration in the burette is called the titrant, whereas the solution of unknown concentration in the flask is called the analyte, or titrand. Titrimetric analyses can be classified into four types based on the reactions between the titrant and analyte.
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Types of Toxins01:36

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Humans continually engage with an environment rich in potentially harmful chemicals. These are introduced to our bodies through inhalation, ingestion, or skin contact. These chemicals exist in various forms, such as air and environmental pollutants, agricultural chemicals, organic solvents, and heavy metals.
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Chromatographic techniques are classified in three ways: the classification is based on the physical state of the stationary and mobile phases, how the mobile phase and the stationary phase contact each other, or through the chemical or physical processes that isolate the components of the sample. Typically, the mobile phase is either a liquid or gas, while the stationary phase is either a solid or a liquid layer applied to a solid surface.
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Mass spectrometry is a powerful characterization technique that can identify and separate a wide variety of compounds ranging from chemical to biological entities, based on their mass-to-charge ratio (m/z). The instruments that allow this detection, known as mass spectrometers, have three components: an ion source, a mass analyzer, and a detector. These spectrometers differ based on the nature of their ion source and analyzers.
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Related Experiment Video

Updated: Sep 24, 2025

Resolving Water, Proteins, and Lipids from In Vivo Confocal Raman Spectra of Stratum Corneum through a Chemometric Approach
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Toxins' classification through Raman spectroscopy with principal component analysis.

Vera Mozhaeva1, Denis Kudryavtsev2, Kirill Prokhorov3

  • 1Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow 119991, Russian Federation; Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry of the Russian Academy of Sciences, Moscow 117997, Russian Federation.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|May 3, 2022
PubMed
Summary

Raman spectroscopy combined with principal component analysis (PCA) can classify peptide and protein toxins by structure. This method rapidly analyzes toxins, distinguishing even disulfide isomers, aiding rare venomous animal studies.

Keywords:
Principal component analysisProteinsRaman spectroscopyToxinology

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Area of Science:

  • Biochemistry
  • Spectroscopy
  • Bioinformatics

Background:

  • Toxin classification is crucial for understanding venom composition and function.
  • Distinguishing between structurally similar toxins, like disulfide isomers, remains challenging.
  • Rapid analysis methods are needed for rare or endangered species.

Purpose of the Study:

  • To develop a method for classifying peptide and protein toxins using Raman spectroscopy and PCA.
  • To discriminate between different toxin classes (e.g., three-finger toxins and conotoxins) and identify structural variations.
  • To enable rapid analysis and characterization of newly discovered toxins.

Main Methods:

  • Application of Raman spectroscopy to a set of peptide and protein toxins and their synthetic analogues.
  • Utilizing Principal Component Analysis (PCA) to analyze Raman spectral data.
  • Confirmation of results using bioinformatic methods.

Main Results:

  • Successful classification of toxins based on primary and secondary structures.
  • Discrimination between snake venom three-finger toxins and marine mollusk α-conotoxins.
  • Identification of differences in spatial structure within toxin groups and distinction of disulfide isomers.
  • Validation of the developed technique through bioinformatic analysis.

Conclusions:

  • Raman spectroscopy combined with PCA provides a rapid and effective method for toxin classification and structural analysis.
  • The method allows for the differentiation of toxin classes and even subtle structural variations like disulfide bond configurations.
  • This approach is valuable for studying toxins from rare venomous animals due to low specimen consumption and can guide toxin synthesis.