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Fabrication of Size-Controlled and Emulsion-Free Chitosan-Genipin Microgels for Tissue Engineering Applications
Published on: April 13, 2022
Biodegradable chitosan nanogels crosslinked with genipin.
Maite Arteche Pujana1, Leyre Pérez-Álvarez, Luis Carlos Cesteros Iturbe
1Grupo de Nuevos Materiales y Espectroscopia Supramolecular, Departamento de Química Física, Facultad de Ciencia y Tecnología, Universidad del País Vasco (UPV/EHU), 644 Bilbao, Spain.
Carbohydrate Polymers
|April 3, 2013
Summary
Genipin-crosslinked chitosan nanoparticles were synthesized, yielding highly monodisperse nanogels. These biocompatible nanogels exhibit tunable properties, making them promising for diverse biomedical applications.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Polymer Chemistry
Background:
- Chitosan is a biocompatible polymer with potential in biomedical applications.
- Developing stable and well-defined chitosan nanostructures is crucial for advanced uses.
- Crosslinking agents are needed to improve chitosan's properties, such as solubility and stability.
Purpose of the Study:
- To synthesize and characterize genipin-crosslinked chitosan nanoparticles.
- To evaluate the effect of genipin crosslinking on chitosan's physicochemical properties.
- To assess the suitability of these nanogels for biomedical applications.
Main Methods:
- Preparation of chitosan nanogels via reverse microemulsion.
- Characterization using Transmission Electron Microscopy (TEM) for size and morphology.
- Spectroscopic analysis (UV-vis, 1H NMR) to confirm genipin incorporation.
- Dynamic Light Scattering (DLS) and zeta potential measurements to determine hydrodynamic diameter and surface charge at varying pH.
Main Results:
- Highly monodisperse chitosan nanogels with sizes ranging from 3-20 nm (TEM) were successfully prepared.
- Genipin incorporation into the chitosan matrix was confirmed and quantified.
- Crosslinked chitosan exhibited enhanced water solubility at neutral pH compared to pure chitosan.
- Hydrodynamic diameter ranged from 270-390 nm, with slight increases at acidic pH due to protonation.
- Zeta potential measurements confirmed pH-dependent protonation of amino groups.
Conclusions:
- Genipin crosslinking effectively produces stable, monodisperse chitosan nanogels.
- The nanogels demonstrate pH-responsive behavior and improved solubility.
- Their biocompatibility, biodegradability, and tunable properties position them as excellent candidates for various biomedical applications.
