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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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Proteomics01:33

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A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term...
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Related Experiment Video

Updated: Aug 27, 2025

15N CPMG Relaxation Dispersion for the Investigation of Protein Conformational Dynamics on the µs-ms Timescale
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Evaluation of a Raman Chemometric Method for Detecting Protein Structural Conformational Changes in Solution.

Lauren Fontana1, Carl Anderson2, Robin Bogner3

  • 1Department of Pharmaceutical Science, University of Connecticut School of Pharmacy, 69 North Eagleville Road, Storrs, CT 06269-3092, USA; Sanofi, 15 Pleasant Street, Framingham, MA 01701, USA.

Journal of Pharmaceutical Sciences
|September 24, 2022
PubMed
Summary
This summary is machine-generated.

Raman spectroscopy, combined with principal component analysis (PCA), can detect subtle protein structural changes linked to aggregation. Optimizing spectral regions improves accuracy, even with excipients like sucrose.

Keywords:
Circular dichroismPrincipal component analysisProtein aggregationRaman spectroscopyStructure

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Area of Science:

  • Biophysical Chemistry
  • Protein Science
  • Spectroscopy

Background:

  • Protein structural changes, particularly tertiary and secondary structures, precede aggregation.
  • Monitoring these changes is crucial for understanding protein stability and formulation.
  • Raman scattering offers potential for routine structural analysis.

Purpose of the Study:

  • To develop and optimize a Raman spectroscopy method using principal component analysis (PCA) for detecting pH-induced tertiary structural changes in proteins.
  • To assess the method's efficacy in monitoring protein conformation and aggregation.
  • To evaluate the impact of formulation excipients, such as sucrose, on spectral analysis.

Main Methods:

  • Utilized principal component analysis (PCA) on Raman spectra of α-lactalbumin solutions.
  • Optimized sample preparation and spectral parameters for a bulk Raman probe.
  • Analyzed spectral regions (600-1850 cm⁻¹ and 1530-1780 cm⁻¹) and compared with circular dichroism (CD) data.

Main Results:

  • PCA of Raman spectra effectively detected pH-induced tertiary structural changes in protein conformation.
  • Analysis of a limited spectral region (1530-1780 cm⁻¹) improved discrimination of protein states, especially in the presence of sucrose.
  • The method accurately distinguished structural differences in concentrated protein solutions.

Conclusions:

  • Raman spectroscopy coupled with PCA is a promising tool for monitoring protein structural stability.
  • The method can detect subtle conformational changes relevant to aggregation.
  • Further exploration for routine monitoring in solution and solid states is warranted.