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Injectable Supramolecular Polymer-Nanoparticle Hydrogels for Cell and Drug Delivery Applications

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Responsive Hydrogel Nanoparticles for Pulmonary Delivery.

Nathanael A Stocke¹, Susanne M Arnold², J Zach Hilt¹

¹Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506, USA.

Journal of Drug Delivery Science and Technology

|September 5, 2015

Summary

This summary is machine-generated.

Researchers developed pH-responsive hydrogel nanoparticles (HNPs) for pulmonary drug delivery. Spray-dried HNPs demonstrated excellent aerosol performance, retaining responsive properties for targeted lung delivery.

Keywords:

Responsive Hydrogels aerosol performance drug delivery inhalation nanoparticles pulmonary delivery

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Area of Science:

Materials Science
Nanotechnology
Drug Delivery

Background:

Nanoparticles are extensively researched for advanced drug delivery.
Hydrogel nanoparticles (HNPs) combine nanotechnology advantages with hydrogel properties.
Stimuli-responsive hydrogels are promising for targeted drug release, especially for pulmonary delivery.

Purpose of the Study:

To synthesize and characterize pH-responsive HNPs for potential pulmonary drug delivery.
To evaluate the aerodynamic performance of spray-dried HNPs for inhalation.
To confirm the retained responsive behavior of HNPs after spray drying.

Main Methods:

Synthesis of two pH-responsive HNPs (HNP120 and HNP270) using functional monomers and a crosslinker.
Physicochemical characterization including particle size analysis (hydrodynamic and minimal diameters).
Spray drying of HNP120 into composite dry powders and evaluation of aerodynamic performance via cascade impaction.

Main Results:

HNP120 and HNP270 exhibited distinct hydrodynamic and minimal diameters (approx. 120/80 nm and 270/115 nm, respectively).
Electron microscopy confirmed particle size and morphological uniformity.
Spray-dried HNP120 powders showed good aerosol performance (MMAD 4.82 ± 0.37, fine particle fraction > 30%) and retained pH-responsiveness.

Conclusions:

pH-responsive HNPs can be successfully synthesized and characterized.
Spray drying is a viable method for creating inhalable HNP powders with good aerosol properties.
These HNPs show potential as intelligent drug delivery systems for targeted pulmonary delivery, combining nanotechnology and stimuli-responsiveness.