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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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Updated: Jan 15, 2026

An Experimental and Finite Element Protocol to Investigate the Transport of Neutral and Charged Solutes across Articular Cartilage
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An experimental-computational approach for measuring charged solute diffusivity through human synovium.

Alexandra L Davis1, Ashish Vaidyanathan1, Sarah Owusu Sachie1

  • 1Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO, USA.

Journal of Biomechanics
|October 14, 2025
PubMed
Summary
This summary is machine-generated.

Synovium rapidly clears drugs from joints. This study found that both molecular weight and charge significantly affect drug diffusion through synovium, impacting intra-articular drug delivery efficacy.

Keywords:
ArthritisDrug deliveryFinite element modelingIntra-articularMultiphasicSolute transportSynovium

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Area of Science:

  • Biomedical Engineering
  • Pharmacology
  • Tissue Engineering

Background:

  • Intra-articular drug delivery targets arthritic joints but faces challenges due to rapid drug clearance by the synovium.
  • Previous work established a finite element model (FEM) to determine neutral solute diffusivity (Deff) in synovium.

Purpose of the Study:

  • To measure the effective diffusivity (Deff) of charged dextrans in human synovium.
  • To investigate the influence of molecular weight and charge on solute transport within the synovium.
  • To understand charged solute-matrix interactions in synovium for improved drug delivery.

Main Methods:

  • Adapted an experimental-computational approach using FEM to analyze charged dextran diffusion.
  • Measured Deff and half-life (t1/2) for neutral, anionic, and cationic dextrans of varying molecular weights.
  • Quantified the fixed charge density of human synovium.

Main Results:

  • Synovium exhibits negligible fixed charge density compared to other soft tissues.
  • Deff is significantly influenced by both molecular weight and solute charge.
  • Cationic dextrans showed higher Deff and lower t1/2 than anionic and neutral dextrans.
  • 4 kDa dextrans diffused faster than 20 kDa dextrans, except for cationic dextrans.

Conclusions:

  • Synovial drug clearance is modulated by molecular weight and charge, not just size.
  • Understanding these charged solute-matrix interactions is crucial for optimizing intra-articular drug delivery strategies.
  • These findings provide foundational data for future research in synovial transport and drug development.