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Related Concept Videos

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Mechanistic models, a category encompassing both physiological and compartmental modeling, differ from empirical models' approaches to incorporating known factors about the systems being modeled. Empirical models describe data with minimal assumptions, while mechanistic models aim to provide a robust description of available data by specifying assumptions and integrating known factors about the system. Compartmental analysis is a key example of a mechanistic model in pharmacokinetics and...
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Mechanistic Models: Compartment Models in Algorithms for Numerical Problem Solving01:29

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Mechanistic models play a crucial role in algorithms for numerical problem-solving, particularly in nonlinear mixed effects modeling (NMEM). These models aim to minimize specific objective functions by evaluating various parameter estimates, leading to the development of systematic algorithms. In some cases, linearization techniques approximate the model using linear equations.
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Compartmental analysis is a widely adopted approach to characterizing drug pharmacokinetics. It uses compartment models that conceptualize the body as a collection of reversibly communicating compartments, each representing a group of tissues exhibiting similar drug distribution characteristics. The movement rate of the drug between these compartments is typically described by first-order kinetics.
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Mechanistic Models: Compartment Models in Individual and Population Analysis01:23

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Mechanistic models are utilized in individual analysis using single-source data, but imperfections arise due to data collection errors, preventing perfect prediction of observed data. The mathematical equation involves known values (Xi), observed concentrations (Ci), measurement errors (εi), model parameters (ϕj), and the related function (ƒi) for i number of values. Different least-squares metrics quantify differences between predicted and observed values. The ordinary least...
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Multicompartment Models: Overview01:14

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Multicompartment models are mathematical constructs that depict how drugs are distributed and eliminated within the body. They segment the body into several compartments, symbolizing various physiological or anatomical areas connected through drug transfer processes such as absorption, metabolism, distribution, and elimination.
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Noncompartmental analyses offer an alternative method for describing drug pharmacokinetics without relying on a specific compartmental model. In this approach, the drug's pharmacokinetics are assumed to be linear, with the terminal phase log-linear. This assumption allows for simplified analysis and interpretation of the drug's behavior in the body.
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Related Experiment Video

Updated: Oct 6, 2025

Fabrication of Compressed Hosiery and Measurement of its Pressure Characteristic Exerted on the Lower Limbs
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Continuous direct compression: Development of an empirical predictive model and challenges regarding PAT

B Bekaert1, B Van Snick2, K Pandelaere1

  • 1Laboratory of Pharmaceutical Technology, Department of Pharmaceutics, Ghent University, Ottergemsesteenweg 460, B-9000 Ghent, Belgium.

International Journal of Pharmaceutics: X
|January 13, 2022
PubMed
Summary

This study developed a predictive model for pharmaceutical manufacturing, optimizing blend properties and process parameters to improve tablet quality and reduce development time. The model enhances processability and aids in implementing Process Analytical Technology (PAT) tools.

Keywords:
#BP, Number of blade passes#RMB1, Number of radial mixing blades of the main blenderAPI, Active pharmaceutical ingredientAPI_sd, Spray dried APIBRT, Bulk residence timeBU, Blend uniformityCDC, Continuous direct compressionCDC-50CU, Content uniformityC_P, Caffeine anhydrous powderContinuous direct compressionContinuous manufacturingDCP, Dicalcium phosphate / Emcompress ANFD, Fill depthHM1/HM2, Hold-up mass main blender/Hold-up mass lubricant blenderImp1, Impeller speed main blenderLC, Percentage label claimMCF, Main compression forceMCH, Main compression heightMPT_μ, Metoprolol micronizedMgSt, Magnesium stearate/Ligamed MF-2-VMultivariate data-analysisNIR, Near infraredPATPAT, Process Analytical TechnologyPC, Principle componentPCA, Principle component analysisPCD, Pre-compression displacementPCF, Pre-compression forcePCH, Pre-compression heightPH101, Microcrystalline cellulose / Avicel PH-101PH200, Microcrystalline cellulose / Avicel PH-200PLS, Partial least squaresP_DP, Paracetamol dense powderP_P, Paracetamol powderP_μ, Paracetamol micronizedPredictive modelingQ2, Goodness of predictionR2Y, Goodness of fitRMSEcv, Root mean squared error of cross validationRSDTW, Relative standard deviation of tablet weightSD100, Mannitol / Pearlitol 100 SDT80, Lactose / Tablettose 80T_P, Theophylline anhydrous powderrpm, Revolutions per minuteσForce, Main compression force variabilityσPCD, Variability in pre-compression displacement

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Area of Science:

  • Pharmaceutical Sciences
  • Chemical Engineering
  • Materials Science

Background:

  • Optimizing pharmaceutical manufacturing processes is crucial for ensuring drug product quality and reducing development costs.
  • Understanding the interplay between blend properties, critical quality attributes (CQA), and critical process parameters (CPP) is essential for robust process design.
  • Challenges in blend processability and Process Analytical Technology (PAT) implementation can hinder efficient manufacturing.

Purpose of the Study:

  • To develop an empirical predictive model correlating blend properties with CQAs and CPPs for blending and tableting.
  • To investigate the impact of blend properties and process parameters on blending performance and tablet quality.
  • To identify challenges in PAT implementation and continuous direct compression (CDC) platform performance.

Main Methods:

  • Quantitative analysis of relationships between blend properties, CQAs, and CPPs.
  • Evaluation of thirty diverse ternary blends on a continuous direct compression line (ConsiGma™ CDC-50).
  • Assessment of impeller configuration, impeller speed, and blend composition effects on blending and compression.

Main Results:

  • Impeller configuration and speed significantly influenced blending performance, while blend properties had a limited impact.
  • Blend properties significantly affected tablet quality during compression.
  • An empirical predictive model was successfully developed to guide process configuration selection.

Conclusions:

  • The developed predictive model can reduce trial runs, development time, and costs for new drug products.
  • Blend properties present significant challenges for PAT implementation and CDC platform performance.
  • Further process development is necessary to address remaining challenges in blend properties and PAT integration.