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Updated: Jan 26, 2026
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Coherent anti-Stokes Raman Scattering CARS Microscopy Visualizes Pharmaceutical Tablets During Dissolution
Published on: July 4, 2014
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Detecting and Quantifying Microscale Chemical Reactions in Pharmaceutical Tablets by Stimulated Raman Scattering
Benjamin Figueroa1, Tai Nguyen1, Sutthilug Sotthivirat2
1Department of Chemistry , University of Washington , Seattle , Washington 98195 , United States.
Analytical Chemistry
|April 23, 2019
Summary
Drug salt disproportionation is a common issue. Stimulated Raman scattering (SRS) microscopy offers a new way to chemically image this process at the micrometer level, revealing water-mediated pathways.
Area of Science:
- Pharmaceutical Science
- Chemical Engineering
- Materials Science
Background:
- * Approximately 50% of drugs are formulated as salts to enhance properties like solubility and efficacy.
- * Salt disproportionation is a frequent challenge in solid drug formulations, impacting stability and performance.
- * Current characterization methods lack the necessary noninvasive, micrometer-resolution capabilities to study this phenomenon.
Purpose of the Study:
- * To demonstrate the utility of stimulated Raman scattering (SRS) microscopy for noninvasive chemical imaging of drug salt disproportionation.
- * To investigate the molecular mechanisms underlying salt disproportionation in solid-state drug formulations.
- * To analyze the salt disproportionation of pioglitazone hydrochloride (PIO-HCl) at low drug loading.
Main Methods:
- * Application of stimulated Raman scattering (SRS) microscopy for sensitive, quantitative chemical imaging.
- * Noninvasive characterization of solid-state chemical reactions at micrometer resolution.
- * Analysis of pioglitazone hydrochloride (PIO-HCl) salt disproportionation at 1% w/w loading.
Main Results:
- * SRS microscopy successfully provided sensitive and quantitative chemical imaging of salt disproportionation.
- * The study identified a water-mediated pathway contributing to pioglitazone hydrochloride disproportionation.
- * Demonstrated the feasibility of SRS microscopy for studying drug disproportionation at very low drug concentrations.
Conclusions:
- * Stimulated Raman scattering (SRS) microscopy is a powerful tool for noninvasive chemical imaging of solid-state reactions.
- * Understanding salt disproportionation mechanisms is crucial for developing stable and effective drug formulations.
- * Noninvasive imaging techniques like SRS microscopy are essential for mechanistic studies in pharmaceutical science.
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