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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

530
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...
530
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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Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

1.0K
The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
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Related Experiment Video

Updated: Sep 9, 2025

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Raman spectroscopy as a tool to accelerate development of complex medicinal products.

Panagiota Zarmpi1, Dimitrios Tsikritsis2, Andrew C Watson3

  • 1Department of Life Sciences, University of Bath, Claverton Down, Bath BA2 7AY, UK; School of Chemistry & Chemical Engineering, University of Surrey, Guildford GU2 7XH, UK.

Journal of Controlled Release : Official Journal of the Controlled Release Society
|September 4, 2025
PubMed
Summary

Raman spectroscopy offers a new way to assess topical generic drugs, potentially speeding up regulatory approval. This method helps determine if generic skin medicines are equivalent to original ones, improving patient access to affordable treatments.

Keywords:
Cutaneous pharmacokineticsRaman spectroscopyRegulatory scienceTopical drug bioavailabilityTopical drug product bioequivalence

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Area of Science:

  • Regulatory science
  • Pharmaceutical sciences
  • Dermatology
  • Analytical chemistry

Background:

  • Assessing topical generic drugs is difficult due to the lack of in vivo methods for cutaneous pharmacokinetics.
  • Current methods require lengthy and costly clinical trials, hindering generic product development and patient access to affordable medicines.

Purpose of the Study:

  • To demonstrate a novel regulatory science tool using Raman spectroscopy for evaluating complex topical generic drug products.
  • To show the potential of Raman spectroscopy in establishing bioequivalence between generic and reference-listed topical formulations.

Main Methods:

  • Utilized Raman spectroscopy to quantify the spatiotemporal disposition of metronidazole (a rosacea treatment) in skin.
  • Analyzed spectroscopic data to extract pharmacokinetic metrics for comparing different topical formulations (gels and solutions).

Main Results:

  • Raman spectroscopy successfully quantified drug distribution within the skin and near its site of action.
  • Pharmacokinetic metrics were extracted, enabling comparison between various formulations.

Conclusions:

  • Raman spectroscopy provides an objective and efficient method for assessing topical generic drugs.
  • This technique has the potential to streamline the bioequivalence assessment process, facilitating the development of complex generic topical products and enhancing patient access to affordable treatments.