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Related Concept Videos

Theories of Dissolution: Diffusion Layer Model01:15

Theories of Dissolution: Diffusion Layer Model

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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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, maintaining...
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Related Experiment Video

Updated: Jun 16, 2026

Dual-mode Imaging of Cutaneous Tissue Oxygenation and Vascular Function
11:35

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Published on: December 8, 2010

Topical dissolved oxygen penetrates skin: model and method.

David F Roe1, Bruce L Gibbins, Daniel A Ladizinsky

  • 1Department of Research and Development, AcryMed, Inc., Beaverton, Oregon 97008, USA. droe@acrymed.com

The Journal of Surgical Research
|January 26, 2010
PubMed
Summary

Topical oxygen, including dissolved oxygen (TDO), can penetrate human skin. This study demonstrates that TDO effectively delivers oxygen transcutaneously, surpassing topical gaseous oxygen (TGO) delivery.

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Area of Science:

  • Dermatology
  • Biophysics
  • Biomedical Engineering

Background:

  • Traditionally, skin oxygenation was attributed solely to internal circulation.
  • Emerging research suggests external oxygen absorption significantly contributes to skin oxygen supply.
  • A novel method was developed to quantify transcutaneous oxygen penetration.

Purpose of the Study:

  • To measure the depth and extent of oxygen penetration into human skin from topical sources.
  • To compare the efficacy of topical dissolved oxygen (TDO) versus topical gaseous oxygen (TGO) delivery.
  • To investigate the influence of skin layers (epidermis and dermis) on oxygen penetration.

Main Methods:

  • Utilized an apparatus with human skin samples separating a topical oxygen source from a fluid-filled chamber.
  • Employed viable human skin samples of varying thicknesses, with and without epidermis.
  • Assessed oxygen penetration from both TDO and TGO devices by monitoring dissolved oxygen changes.

Main Results:

  • The developed model successfully demonstrated transcutaneous oxygen penetration.
  • Topically applied dissolved oxygen was found to penetrate human skin to depths exceeding 700 micrometers.
  • Oxygen penetration was more efficient through the dermis compared to the epidermis.

Conclusions:

  • Topical oxygen application is a viable method for skin oxygenation.
  • Topical dissolved oxygen (TDO) devices are more effective at delivering oxygen transcutaneously than topical gaseous oxygen (TGO) devices.
  • Understanding oxygen penetration dynamics is crucial for developing advanced topical oxygen therapies.