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Inhalable Microparticles Embedding Biocompatible Magnetic Iron-Doped Hydroxyapatite Nanoparticles.

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  • 1Department of Food and Drug, University of Parma, Parco Area delle Scienze 27/A, 43124 Parma, Italy.

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|April 27, 2023
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Summary

Safe, superparamagnetic iron-doped calcium phosphate nanoparticles (FeCaP NPs) were developed into inhalable microparticles. This novel formulation enables targeted lung delivery for advanced diagnostics and therapeutics.

Keywords:
Trojan microparticleshydroxyapatiteinhalable dry powdermicroparticles embedding nanoparticlesnanomedicinepulmonary diseasesuperparamagnetic nanoparticles

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Pulmonary Drug Delivery

Background:

  • Increasing interest in biocompatible inhalable nanoparticles for lung disease treatment and diagnosis.
  • Superparamagnetic iron-doped calcium phosphate nanoparticles (FeCaP NPs) show promise for MRI, drug delivery, and hyperthermia.
  • Need for safe and effective delivery systems for nanoparticles to the lungs.

Purpose of the Study:

  • To develop and characterize inhalable microparticle formulations of FeCaP NPs for lung delivery.
  • To assess the safety and efficacy of FeCaP NPs for inhalation administration.
  • To demonstrate the utility of spray drying for creating a dry powder platform for lung delivery.

Main Methods:

  • Synthesis and characterization of superparamagnetic iron-doped calcium phosphate nanoparticles (FeCaP NPs).
  • Cytotoxicity assessment of FeCaP NPs on human lung alveolar epithelial type 1 (AT1) cells.
  • Formulation of D-mannitol spray-dried microparticles embedding FeCaP NPs.
  • Evaluation of aerodynamic particle size distribution and nanoparticle release upon microparticle dissolution.

Main Results:

  • FeCaP NPs were found to be non-cytotoxic to human lung AT1 cells, even at high doses.
  • Respirable dry powders of D-mannitol microparticles embedding FeCaP NPs were successfully formulated using spray drying.
  • The nanoparticle-in-microparticle approach protected FeCaP NPs, enabling their release with preserved characteristics.
  • The microparticles achieved optimal aerodynamic properties for effective lung deposition.

Conclusions:

  • FeCaP NPs are safe for inhalation administration and suitable for lung delivery applications.
  • Spray-dried D-mannitol microparticles provide an effective platform for delivering FeCaP NPs to the lungs.
  • This approach facilitates magnetically driven applications in the lung, including diagnostics and therapeutics.