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Related Concept Videos

Drug Dissolution: Requirements and Profile Comparison01:14

Drug Dissolution: Requirements and Profile Comparison

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The acceptance criteria for dissolution profile data are anchored in Q values, representing the percentage of drug dissolved within a specified period. This assessment unfolds in three stages:First Stage: The test passes if all six drug dosage units are equal to or greater than Q plus 5%; otherwise, the sample proceeds to the second stage.Second Stage: The average of twelve units must be equal to or greater than Q, with no unit falling below Q - 15% to pass; if not, it progresses to the final...
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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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In Vitro Drug Dissolution: Alternative Methods01:17

In Vitro Drug Dissolution: Alternative Methods

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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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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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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.
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...
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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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Variability of Zinc Oxide Dissolution Rates.

Monika Michaelis1, Cornelius Fischer2, Lucio Colombi Ciacchi1,3

  • 1Hybrid Materials Interfaces Group, Faculty of Production Engineering, Bremen Center for Computational Materials Science (BCCMS), and Center for Environmental Research and Sustainable Technology (UFT), University of Bremen , Am Fallturm 1, 28359 Bremen, Germany.

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Summary

Zinc oxide (ZnO) dissolution rates vary significantly between crystal surfaces. Understanding these differences in zinc ion release is crucial for environmental risk assessment.

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Area of Science:

  • Environmental Science
  • Materials Science
  • Geochemistry

Background:

  • Zinc oxide (ZnO) is widely used, particularly in cosmetics, leading to environmental release.
  • Dissolution of ZnO can release cytotoxic zinc ions (Zn2+), posing environmental risks.

Purpose of the Study:

  • To investigate the impact of crystal defects on ZnO dissolution kinetics.
  • To quantify dissolution rate differences between polar (000-1) and nonpolar (10-10) ZnO surfaces.

Main Methods:

  • Utilized atomic force microscopy (AFM) and vertical scanning interferometry (VSI).
  • Analyzed dissolution kinetics in ultrapure water.
  • Employed rate spectrum analysis to determine rate variability.

Main Results:

  • The mean dissolution rate of the (000-1) surface was over 4 times higher than the (10-10) surface.
  • Observed a dissolution rate variability exceeding one order of magnitude.
  • Identified key rate components contributing to overall dissolution.

Conclusions:

  • Crystal surface structure significantly influences ZnO dissolution rates.
  • Dissolution rate variability is substantial and must be considered.
  • Data are critical inputs for reactive transport models predicting Zn2+ environmental release.