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Related Concept Videos

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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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.
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Related Experiment Video

Updated: Mar 29, 2026

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Cost-Efficient and Fast At-Line Assessment of Content and Uniformity in Low-Dose Dimdazenil Capsules Using

Xun Ma1, Lianlian Shan2, Shuangpeng Zhu3

  • 1NMPA Key Laboratory for Quality Research and Evaluation of Chemical Drugs, National Institutes for Food and Drug Control, Beijing 102629, China.

Pharmaceutics
|March 28, 2026
PubMed
Summary

Transmission Raman spectroscopy (TRS) successfully quantifies low-dose dimdazenil capsules (~1.5% API). This validated method offers a rapid, non-destructive, and environmentally friendly alternative to HPLC for pharmaceutical quality control.

Keywords:
design of experimentsdimdazenilpartial least squares analysisquantitative analysistransmission Raman spectroscopy

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Area of Science:

  • Pharmaceutical Analysis
  • Spectroscopy
  • Quality Control

Background:

  • Transmission Raman spectroscopy (TRS) is typically used for high-dose pharmaceutical formulations (>5% API).
  • Analysis of low-dose solid dosage forms (<5% API) using TRS remains underexplored.
  • This study focuses on developing a TRS method for dimdazenil capsules with approximately 1.5% API.

Purpose of the Study:

  • To develop and validate a Transmission Raman spectroscopy (TRS) method for the accurate quantification of low-dose dimdazenil in solid dosage forms.
  • To demonstrate the applicability of TRS for drug concentrations rarely reported in existing literature.
  • To assess the method's greenness and compare it to conventional techniques.

Main Methods:

  • A partial least squares (PLS) model was constructed using TRS spectra from dimdazenil capsules.
  • A design of experiments (DoE) approach was employed to introduce sample variability.
  • Validation was performed against high-performance liquid chromatography (HPLC) data, including specificity checks and AGREEprep greenness assessment.

Main Results:

  • The TRS method demonstrated acceptable accuracy with relative errors below 5.0% for low-dose dimdazenil quantification.
  • Analysis was rapid (<150 s per capsule) and required no sample preparation.
  • The method showed environmental superiority over HPLC, scoring 0.86 on AGREEprep, with specificity confirmed by a unique dimdazenil band (1628 cm⁻¹).

Conclusions:

  • Transmission Raman spectroscopy (TRS) is effectively applicable to low-dose pharmaceutical formulations (~1.5% API), expanding its utility beyond high-dose applications.
  • This validated TRS method offers a reliable, rapid, and greener alternative for pharmaceutical quality control.
  • The findings support the integration of TRS into continuous manufacturing processes for challenging low-concentration products.