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Updated: May 22, 2026
05:44
Formation of Dispersible Taohong Siwu Tablets
Published on: February 3, 2023
Comprehensive study of dynamic curing effect on tablet coating structure.
Claire Gendre1, Muriel Genty, Julio César da Silva
1Groupe de Chimie Analytique de Paris-Sud, Univ Paris-Sud, Châtenay-Malabry, France. claire.gendre@gmail.com
Summary
This study used advanced non-destructive techniques to investigate the dynamic curing of ethylcellulose film coatings. Results show a 4-hour curing period ensures reproducible drug release and coating stability, surpassing traditional dissolution testing.
Area of Science:
- Pharmaceutical Sciences
- Materials Science
- Chemical Engineering
Background:
- Traditional dissolution testing is used for film coating curing end-points, but the curing process itself remains under-investigated.
- Ethylcellulose (Aquacoat)-based film coatings are crucial for drug delivery, requiring precise control over their stability and curing.
Purpose of the Study:
- To elucidate the dynamic curing mechanisms of ethylcellulose film coatings over time using a combination of non-destructive techniques.
- To precisely determine the curing end-point for optimized tablet coating stability and drug release.
Main Methods:
- Employed a suite of non-destructive techniques: X-ray micro-computed tomography (XμCT), Near Infrared (NIR) spectroscopy, Raman spectroscopy, and X-ray microdiffraction.
- Performed direct measurements on ethylcellulose-coated tablets to analyze microstructural changes and chemical composition during curing.
Main Results:
- A dynamic curing period of 4 hours was identified as sufficient for reproducible drug release and stabilization of coating microstructure.
- XμCT revealed reduced internal porosity, while NIR and Raman showed stable spectral data post-curing.
- X-ray microdiffraction indicated coating densification, a 10 μm thickness reduction, melting and spreading of cetyl alcohol, and initial heterogeneity in coating constituents.
Conclusions:
- Non-destructive techniques provide novel insights into tablet coating structure and enable precise determination of the curing end-point.
- The findings offer enhanced possibilities for pharmaceutical process control and formulation development.
- Understanding curing dynamics is essential for ensuring long-term stability and performance of film-coated pharmaceutical products.
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