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In Vitro Drug Dissolution: Compendial Testing Models I01:13

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Compendial dissolution methods are standardized procedures defined by pharmacopeias to evaluate the rate at which a drug dissolves in a specific medium. These methods ensure batch-to-batch consistency, enable quality control, and support the prediction of drug bioavailability. They are critical for both immediate and modified-release drug products.The apparatuses used for dissolution testing differ in their design and mechanical function, but all aim to simulate the physiological environment of...
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Simulation of a tablet coating process at different scales using DEM.

P Boehling1, G Toschkoff1, S Just2

  • 1Research Center Pharmaceutical Engineering GmbH, Graz, Austria.

European Journal of Pharmaceutical Sciences : Official Journal of the European Federation for Pharmaceutical Sciences
|August 13, 2016
PubMed
Summary
This summary is machine-generated.

Scaling up tablet spray coating processes using computational Discrete Element Method (DEM) simulations is crucial for pharmaceutical manufacturing. Maintaining a constant Froude number during scale-up ensures uniform spray residence time and faster cycle times compared to constant circumferential velocity.

Keywords:
CoatingDiscrete Element MethodMulti-scale modelingScale-upSimulation

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Area of Science:

  • Pharmaceutical Engineering
  • Computational Fluid Dynamics
  • Process Scale-up

Background:

  • Tablet spray coating is vital for pharmaceutical product development, impacting drug release, protection, and branding.
  • Scaling up coating processes from laboratory to industrial levels presents significant challenges in achieving consistent coating quality.
  • Computational modeling offers a promising approach to predict and optimize scale-up behavior.

Purpose of the Study:

  • To investigate the influence of different scale-up rules on tablet bed dynamics during spray coating.
  • To utilize Discrete Element Method (DEM) simulations for predicting scale-up outcomes.
  • To compare the effectiveness of maintaining constant Froude number versus constant circumferential velocity for scale-up.

Main Methods:

  • Laboratory experiments were conducted to measure tablet material parameters.
  • Discrete Element Method (DEM) simulations were employed to model tablet behavior at laboratory, pilot, and industrial scales.
  • A glued sphere approach was used to accurately represent tablet shape in simulations.

Main Results:

  • DEM simulations provided qualitative and quantitative data across different scales, revealing variations in tablet bed behavior.
  • The study analyzed the evolution of inter-tablet coating variation with scale and process parameters.
  • Simulations demonstrated that constant Froude number scaling leads to more uniform spray residence times and shorter cycle times.

Conclusions:

  • Computational modeling, specifically DEM, is effective for simulating and predicting tablet spray coating scale-up.
  • Scaling up by maintaining a constant Froude number is advantageous over constant circumferential velocity for process efficiency and uniformity.
  • The findings provide valuable insights for optimizing industrial-scale tablet coating processes.