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Genipin-crosslinked pectin hydrogels: A dual strategy for enhanced 3D printability and stability
Jorge Mercado-Rico1, Luis Andrés Pérez2, José María Alonso3
1Instituto de Ciencia y Tecnología de Polímeros (ICTP-CSIC), C/Juan de la Cierva, 3, 28006, Madrid, Spain.
Carbohydrate Polymers
|November 30, 2025
Summary
Researchers developed improved pectin hydrogels for 3D bioprinting. Amine modification and genipin crosslinking enhanced mechanical strength and printability, creating stable, biocompatible scaffolds for biomedical applications.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Biotechnology
Background:
- Polysaccharide-based biomaterials are of significant interest for biomedical applications.
- Pectin, a natural polysaccharide, offers biocompatibility but has limitations in mechanical strength and printability for 3D bioprinting.
- Overcoming these limitations is crucial for expanding pectin's utility in advanced manufacturing.
Purpose of the Study:
- To enhance the mechanical properties and printability of pectin for 3D extrusion bioprinting.
- To develop novel pectin-based hydrogels with improved stability and dynamic responsiveness.
- To create a versatile platform for fabricating complex 3D scaffolds using additive manufacturing.
Main Methods:
- Pectin was modified with amine groups and subsequently crosslinked using genipin at varying ratios.
- Hydrogel mechanical properties were assessed, and crosslinking efficiency was determined.
- Biomaterial inks were formulated with crosslinked pectin particles in a reactive pectin solution for 3D extrusion printing.
- Scaffold structural integrity, porosity, swelling kinetics, and hydrolytic stability were evaluated.
Main Results:
- Amine-modified and genipin-crosslinked pectin hydrogels exhibited enhanced mechanical stability (3-5 KPa elastic moduli) under physiological conditions.
- Precise 3D extrusion of multi-layered scaffolds (up to 7 layers) was achieved, maintaining structural integrity after lyophilization.
- The 3D printed pectin hydrogels demonstrated increased porosity and pH-responsive swelling kinetics.
- High hydrolytic stability and non-cytotoxicity were confirmed, indicating biocompatibility.
Conclusions:
- Amine modification and genipin crosslinking effectively improve pectin's mechanical properties and printability for 3D bioprinting.
- The developed pectin-based bioinks offer a promising platform for creating stable, functional 3D scaffolds.
- This approach enables the use of pectin in extrusion-based additive manufacturing for diverse biomedical applications.
