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Related Concept Videos

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...
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Pseudo-3D Subsurface Imaging of Pharmaceutical Solid Dosage Forms Using Micro-spatially Offset Low-Frequency Raman

Ka Rlis Be Rziņš1, Sara J Fraser-Miller1, Keith C Gordon1

  • 1The Dodd-Walls Centre for Photonic and Quantum Technologies, Department of Chemistry, University of Otago, Dunedin 9016, New Zealand.

Analytical Chemistry
|June 18, 2021
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Summary

A novel low-frequency Raman spectroscopy technique, micro-spatially offset Raman spectroscopy (micro-SOLFRS), excels at analyzing pharmaceutical solid dosage forms. It provides superior surface and subsurface layer analysis compared to mid-frequency methods.

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Pharmaceutical Sciences

Background:

  • Pharmaceutical solid dosage forms require detailed characterization of surface and subsurface properties.
  • Existing Raman spectroscopy methods may have limitations in probing multilayer or multicomponent systems.
  • Understanding solid-state transformations is crucial for drug stability and efficacy.

Purpose of the Study:

  • To demonstrate a new combinatory Raman subtechnique: micro-spatially offset Raman spectroscopy (micro-SOLFRS).
  • To evaluate micro-SOLFRS for analyzing pharmaceutical solid dosage forms, including multilayer and multicomponent systems.
  • To compare the efficacy of low-frequency (micro-SOLFRS) versus mid-frequency Raman spectroscopy.

Main Methods:

  • Development and application of micro-spatially offset Raman spectroscopy (micro-SOLFRS).
  • Analysis of model pharmaceutical systems: celecoxib, α-lactose (anhydrous and monohydrate), and polyvinylpyrrolidone (PVP).
  • Simultaneous collection of low-frequency and mid-frequency Raman spectral data.

Main Results:

  • Micro-SOLFRS successfully provided qualitative and quantitative information on surface and subsurface layer characteristics.
  • The technique enabled determination of layer thicknesses in model pharmaceutical systems.
  • Monitoring of surface-driven solid-state form transformations was achieved.
  • Low-frequency Raman data (micro-SOLFRS) consistently outperformed mid-frequency data for all analyses.

Conclusions:

  • Micro-SOLFRS is a potent new technique for detailed analysis of pharmaceutical solid dosage forms.
  • The low-frequency domain offers superior insights into surface, subsurface, and transformation characteristics compared to mid-frequency Raman.
  • This technique holds significant promise for pharmaceutical quality control and research.