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Solid-State Quantification of Cocrystals in Pharmaceutical Tablets Using Transmission Low-Frequency Raman
Motoki Inoue1, Takumi Osada1, Hiroshi Hisada1
1Department of Molecular Pharmaceutics , Meiji Pharmaceutical University , 2-522-1, Noshio , Kiyose, Tokyo 204-8588 , Japan.
Low-frequency Raman spectroscopy accurately quantifies pharmaceutical cocrystal content in tablets. This method effectively distinguishes cocrystals from raw materials, ensuring product quality during continuous manufacturing.
Area of Science:
- Pharmaceutical Science
- Analytical Chemistry
- Spectroscopy
Background:
- Ensuring consistent cocrystal content in pharmaceutical tablets is vital for continuous manufacturing.
- Conventional Raman spectroscopy struggles to differentiate cocrystals from their constituent raw materials.
Purpose of the Study:
- To demonstrate the quantification of caffeine-glutaric acid cocrystals in model tablets.
- To evaluate the efficacy of transmission low-frequency Raman spectroscopy for this purpose.
Main Methods:
- Utilized transmission low-frequency Raman spectroscopy to analyze cocrystal content in model tablets.
- Employed the partial least-squares (PLS) method for spectral analysis and content prediction.
- Assessed quantitative accuracy using root means square error of cross-validation (RMSECV).
Main Results:
- Low-frequency Raman spectroscopy successfully discriminated between cocrystals and raw materials.
- Transmission mode showed superior quantitative ability (RMSECV = 2.06–3.17) compared to backscattering mode (RMSECV = 2.37–3.91).
- The presence of raw crystalline materials did not impede cocrystal quantification.
Conclusions:
- Transmission low-frequency Raman spectroscopy is a reliable method for quantifying cocrystal content in pharmaceutical tablets.
- This technique supports quality control in continuous pharmaceutical manufacturing processes.
- The method's robustness is demonstrated by its ability to perform accurately even with coexisting raw materials.
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