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Related Concept Videos

In Vitro Drug Dissolution: Compendial Testing Models I01:13

In Vitro Drug Dissolution: Compendial Testing Models I

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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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In Vitro Drug Dissolution: Compendial Testing Models II01:09

In Vitro Drug Dissolution: Compendial Testing Models II

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Various dissolution methods are utilized to assess a drug’s dissolution rate, including the flow-through cell, paddle-over-disk, cylinder, and reciprocating disk methods.The flow-through cell apparatus (USP (United States Pharmacopeia) method 4) comprises a reservoir for the dissolution medium and a pump that propels the medium through the cell containing the test sample. This method is crucial for assessing modified-release dosage forms with minimally soluble active ingredients,...
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In Vitro Drug Dissolution: Alternative Methods01:17

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Alternative drug dissolution methods include the rotating bottle, intrinsic dissolution test, peristalsis, and the Franz diffusion cell method. The rotating bottle method involves meticulously rotating tightly capped controlled-release beads in a temperature-controlled bath. Periodic decanting of samples allows for residue assay, followed by refilling with fresh medium and testing at various pH levels to emulate the gastrointestinal tract conditions.In contrast, the intrinsic dissolution test...
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Theories of Dissolution: Diffusion Layer Model01:15

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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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Factors Affecting Dissolution: Particle Size and Effective Surface Area01:23

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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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Novel stirring method for small-scale dissolution test: Rotating vessel method.

Shiori Ishida1, Samuel Lee2, Balint Sinko2

  • 1Molecular Pharmaceutics Lab., College of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1, Noji-higashi, Kusatsu, Shiga 525-8577, Japan.

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Summary
This summary is machine-generated.

A new rotating vessel method (RV) for small-scale dissolution tests (μDISS) mimics overhead paddle stirring, accurately assessing drug precipitation. This method avoids contact-induced nucleation seen with magnetic stirring bars, providing reliable precipitation profiles for drug development.

Keywords:
Hydrodynamicscarbamazepineibuprofenmagnetic stirrerprecipitation

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Area of Science:

  • Pharmaceutical Sciences
  • Drug Delivery and Formulation
  • Analytical Chemistry

Background:

  • Traditional dissolution testing uses overhead rotating paddle (ORP) or magnetic stirring bar (MSB) methods.
  • MSB in small-scale dissolution tests (μDISS) can cause contact-induced nucleation, altering drug precipitation profiles.
  • Simultaneous use of ORP and in situ UV probes in μDISS is challenging.

Purpose of the Study:

  • To develop and evaluate a novel rotating vessel (RV) stirring method for μDISS.
  • To compare drug dissolution and precipitation profiles using RV-μDISS, MSB-μDISS, and conventional ORP.
  • To assess the utility of RV-μDISS for predicting drug precipitation behavior.

Main Methods:

  • Developed RV-μDISS with a small paddle attached to a UV probe and a rotating vessel.
  • Tested dissolution and precipitation of ibuprofen sodium (IBU Na) and carbamazepine (CBZ).
  • Compared RV-μDISS with MSB-μDISS and conventional ORP using appropriate vessels (500 mL for IBU Na, 50 mL for CBZ).

Main Results:

  • IBU Na dissolution rates were similar across all methods.
  • MSB-μDISS induced rapid crystalline precipitation of IBU free acid, unlike RV-μDISS and ORP-CV which showed liquid-liquid phase separation.
  • CBZ precipitation rate in RV-μDISS was similar to ORP-MV but slower than MSB-μDISS.

Conclusions:

  • The precipitation profile generated by RV-μDISS closely matched conventional ORP methods (ORP-CV and ORP-MV).
  • RV-μDISS effectively avoids contact-induced nucleation, offering a more accurate assessment of drug precipitation.
  • RV-μDISS is a valuable tool for evaluating drug precipitation profiles in small-scale dissolution testing.