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Theories of Dissolution: Diffusion Layer Model01:15

Theories of Dissolution: Diffusion Layer Model

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Dissolution, the process by which drug particles dissolve in a solvent, is explained by the diffusion layer model, a theoretical framework that simulates the absorption of oral drugs and allows us to analyze experimental data.
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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
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Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism01:21

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Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
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Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are...
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Orally administered drugs primarily enter the systemic circulation via passive diffusion through the intestinal membranes. The drug's absorption is influenced by drug stability in the gastrointestinal GI tract, membrane permeability, the surface area available for absorption, luminal drug concentration, and residence time in the lumen. Drug permeability can be enhanced by adjusting the lipophilicity, polarity, or molecular size of the drug, promoting its passive transport across intestinal...
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The pharmacokinetic journey of drugs from solid oral dosage forms into systemic circulation is multifaceted. It begins with disintegration, a prerequisite ensuring a solid dosage form's subdivision into minute particles. Dissolution occurs next as these granulated entities solubilize in gastrointestinal fluids. This solubilization is crucial for the succeeding stage, permeation, which describes the traversal of the drug across the intestinal membrane and its subsequent entry into the blood...
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A Novel Artificial Intelligence System in Formulation Dissolution Prediction.

Haoyu Wang1, Chiew Foong Kwong1, Qianyu Liu2

  • 1Department of Electrical and Electronic Engineering, University of Nottingham Ningbo China, Ningbo, China.

Computational Intelligence and Neuroscience
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Summary
This summary is machine-generated.

This study introduces an artificial neural network (ANN) model for predicting pharmaceutical dissolution results. The system accurately predicts outcomes, reducing time and cost in new drug formulation design.

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Area of Science:

  • Pharmaceutical Science
  • Computational Chemistry
  • Drug Discovery

Background:

  • Artificial neural network (ANN) techniques are integral to pharmaceutical research for data screening and experimental result prediction.
  • Accurate prediction of dissolution results is crucial for efficient drug formulation and development.

Purpose of the Study:

  • To develop and validate a novel dissolution result prediction and screening system utilizing a backpropagation network and advanced regression methods.
  • To enhance the adaptability of the ANN model for predicting dissolution with varying formulation compositions.

Main Methods:

  • A backpropagation artificial neural network (ANN) model was developed and trained using 21 groups of dissolution data.
  • Two regression methods, effective data regression method (EDRM) and reference line regression method (RLRM), were employed for prediction.
  • A data screening function based on decision tree algorithms was integrated into the system.

Main Results:

  • The ANN model demonstrated high accuracy in predicting dissolution results.
  • The system requires a smaller database compared to orthogonal experiments for accurate predictions.
  • The model successfully adapted to predict dissolution even when formulation composition was altered.

Conclusions:

  • The developed ANN model offers a novel, efficient system for drug dissolution prediction and formulation screening.
  • This approach significantly decreases the time and cost associated with new drug formulation design.
  • The system facilitates easier and more effective design of new pharmaceutical formulations.