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Related Concept Videos

Methods for Studying Drug Absorption: In vitro01:16

Methods for Studying Drug Absorption: In vitro

In vitro experiments are crucial for understanding the transport and absorption of drugs through biological materials. These studies employ varied methods such as the diffusion cell method, the everted sac technique, and the everted ring technique.
The diffusion cell method uses a two-compartment cell, including a donor compartment with the drug solution, which simulates the environment where the drug is applied, and a receptor compartment with a buffer solution, which simulates the environment...
In Vitro Drug Dissolution: Alternative Methods01:17

In Vitro Drug Dissolution: Alternative Methods

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...
In Vitro Drug Dissolution: Compendial Testing Models II01:09

In Vitro Drug Dissolution: Compendial Testing Models II

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...
Transdermal Drug Delivery Systems01:18

Transdermal Drug Delivery Systems

Transdermal drug delivery systems (TDDS) enable the controlled release of drugs across the skin into systemic circulation. They are particularly advantageous for drugs with short half-lives or narrow therapeutic indices, as they maintain consistent plasma concentrations and reduce the risk of subtherapeutic or toxic levels.TDDS are categorized into monolithic, reservoir, and mixed systems. Monolithic systems embed the drug in a polymer matrix, where diffusion governs release. Reservoir systems...
Mechanisms of Drug Absorption: Paracellular, Transcellular, and Vesicular Transport01:23

Mechanisms of Drug Absorption: Paracellular, Transcellular, and Vesicular Transport

Drugs need to permeate cell membranes to reach their target sites after administration. Orally administered drugs must transcend intestinal epithelial membrane barriers to infiltrate the systemic circulation. Drugs with a molecular weight of less than 500 Daltons diffuse through gaps between neighboring cells, called paracellular pathways.
However, most drugs use the transcellular route, traversing directly through the cell membranes via two mechanisms: passive and active transport. Passive...
Methods for Studying Drug Absorption: In situ01:09

Methods for Studying Drug Absorption: In situ

In situ experiments, such as the Doluisio method and Single-Pass Perfusion technique, provide critical insights into drug uptake by simulating in vivo conditions for drug absorption.
The Doluisio method involves perfusing a prepared segment of a rat's small intestine with a solution of radiolabeled drug and a non-absorbable marker. This helps to differentiate between absorbed and non-absorbed drug concentrations. The intestinal segment is connected at both ends using tubing and syringes,...

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Updated: May 19, 2026

A Method for Determination and Simulation of Permeability and Diffusion in a 3D Tissue Model in a Membrane Insert System for Multi-well Plates
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Published on: February 23, 2018

Transdermal drug delivery in vitro using diffusion cells.

L Bartosova1, J Bajgar

  • 1Department of Toxicology, Faculty of Military Health Sciences, University of Defence, Trebesska 1575, 50001 Hradec Kralove, Czech Republic. bartosova@pmfhk.cz

Current Medicinal Chemistry
|September 1, 2012
PubMed
Summary
This summary is machine-generated.

Standardized methods for assessing percutaneous absorption are crucial for evaluating drug delivery systems. This review summarizes in vitro testing using static Franz-type diffusion cells for reliable skin absorption data.

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Area of Science:

  • Pharmacology
  • Dermatology
  • Biomedical Engineering

Background:

  • Percutaneous absorption assessment is vital for dermal and transdermal drug delivery systems.
  • Standardized methods and maintained skin integrity are essential for valid and relevant absorption data.
  • Reproducible human data are needed to predict systemic risk from dermal exposure to various chemicals.

Purpose of the Study:

  • To review in vitro methods for assessing percutaneous absorption.
  • To highlight the importance of standardized testing for drug delivery systems.
  • To discuss the utility of in vitro and animal models in drug development and risk assessment.

Main Methods:

  • Review of in vitro skin absorption testing methodologies.
  • Focus on the use of static Franz-type diffusion cells.
  • Discussion of skin integrity monitoring and standardization protocols.

Main Results:

  • In vitro static Franz-type diffusion cells are a key tool for skin absorption studies.
  • Standardization ensures data validity and relevance for drug delivery evaluation.
  • In vitro and animal models aid in screening formulations and understanding transport mechanisms.

Conclusions:

  • Standardized in vitro testing, particularly with Franz-type diffusion cells, is essential for reliable percutaneous absorption assessment.
  • Accurate data support the development of safe and effective dermal and transdermal drug delivery systems.
  • This review provides a summary of established in vitro techniques for skin absorption studies.