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Related Experiment Videos

Engineered microcrystals for direct surface modification with layer-by-layer technique for optimized dissolution.

Dinesh B Shenoy1, Gleb B Sukhorukov

  • 1Max Planck Institute of Colloids and Interfaces, Potsdam/Golm, Germany.

European Journal of Pharmaceutics and Biopharmaceutics : Official Journal of Arbeitsgemeinschaft Fur Pharmazeutische Verfahrenstechnik E.V
|September 29, 2004
PubMed
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This study presents a novel two-step method to create stable, sterically stabilized naproxen microcrystals with controlled drug release. The technique enhances water-insoluble drug delivery through surface modification with biocompatible polyelectrolytes (PEs).

Area of Science:

  • Pharmaceutical Sciences
  • Materials Science
  • Nanotechnology

Background:

  • Developing stable formulations for water-insoluble drugs like naproxen is challenging.
  • Controlled drug release systems are crucial for improving therapeutic efficacy and patient compliance.
  • Surface modification techniques offer potential for enhancing drug delivery properties.

Purpose of the Study:

  • To develop a novel two-step formulation technique for sterically stabilized drug microcrystals.
  • To investigate the surface modification of naproxen microcrystals using sequential electrostatic adsorption of polyelectrolytes (PEs).
  • To evaluate the in vitro controlled release profile of naproxen from the modified microcrystals.

Main Methods:

  • Synthesis of sterically stabilized naproxen microcrystals via pH-induced reprecipitation.

Related Experiment Videos

  • Surface modification using layer-by-layer assembly of biocompatible PEs.
  • Characterization using microelectrophoresis, confocal laser scanning microscopy (CLSM), and scanning electron microscopy (SEM).
  • In vitro drug release studies using a diffusion cell at physiological pH (7.4).

    • Main Results:

    • Stable naproxen microcrystals (15 microm length, -37.5 mV zeta potential) were successfully synthesized.
    • Efficient surface modification with biocompatible PEs was confirmed by charge reversal and CLSM/SEM imaging.
    • The polyelectrolyte coating significantly reduced drug dissolution rate (up to 50% lower than bare crystals).
    • The drug release profile followed zero-order kinetics, indicating sustained release.

    Conclusions:

    • The developed two-step formulation technique enables the creation of stable, tissue-compatible drug microcrystals.
    • Sequential electrostatic adsorption of PEs effectively controls drug release, offering sustained delivery.
    • This method is promising for administering high concentrations of water-insoluble drugs.