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Identification of critical process variables for coating actives onto tablets via statistically designed experiments
Bhagwant D Rege1, John Gawel, Jim H Kou
1Department of Pharmaceutical Sciences, University of Maryland, Baltimore, MD 21201, USA.
International Journal of Pharmaceutics
|April 17, 2002
Summary
Critical processing variables for tablet coating were identified using a Plackett-Burman design. Atomization pressure, pan speed, coating time, and fan pressure significantly impact content uniformity and drug recovery in film-coated tablets.
Area of Science:
- Pharmaceutical Technology
- Process Engineering
- Drug Delivery Systems
Background:
- Ensuring content uniformity and efficient drug loading is crucial for tablet efficacy and safety.
- The United States Pharmacopeia (USP) mandates a % relative standard deviation (RSD) of less than 6% for drug content within a batch.
- Optimizing tablet coating processes requires identifying critical parameters affecting uniformity and recovery.
Purpose of the Study:
- To identify critical processing variables influencing content uniformity and active agent loading during tablet coating.
- To determine which parameters significantly affect the drug content uniformity and recovery in an aqueous-based film coat.
- To establish process conditions that meet USP standards for content uniformity while maximizing drug recovery.
Main Methods:
- Utilized a Plackett-Burman experimental design to investigate multiple process variables.
- Investigated variables including inlet airflow, pan speed, inlet air temperature, coating time, atomization pressure, and fan pressure.
- Analyzed the impact of these variables on content uniformity (% RSD) and drug recovery using statistical analysis.
Main Results:
- Atomization pressure was identified as a major factor affecting content uniformity (P<0.01).
- Pan speed and coating duration also significantly impacted content uniformity (P<0.05).
- Fan pressure (P<<0.01) and temperature (P<0.05) were critical variables influencing drug recovery.
- High correlations were observed between predicted and actual values for content uniformity (r²=0.85) and recovery (r²=0.95).
Conclusions:
- Optimized tablet coating can achieve <6% RSD for drug content and >80% recovery.
- Atomization pressure, pan speed, coating time, fan pressure, and temperature are key parameters for controlling tablet coating quality.
- Statistical experimental design effectively identifies critical variables for robust pharmaceutical manufacturing processes.