Abstract

Hydrogel scaffolding biomaterials are one of the most attractive polymeric biomaterials for regenerative engineering and can be engineered into tissue mimetic scaffolds to support cell growth due to their similarity to the native extracellular matrix. The novel, versatile hydrogel scaffolds based on alginate, gelatin, 2-hydroxyethyl methacrylate, and inorganic agent hydroxyapatite were prepared by modified cryogelation. The chemical composition, morphology, porosity, mechanical properties, effects on cell viability, in vitro degradation, in vitro and in vivo biocompatibility were tested to correlate the material’s composition with the corresponding properties. Scaffolds showed an interconnected porous microstructure, satisfactory mechanical strength, favorable hydrophilicity, degradation, and suitable in vitro and in vivo biocompatible behavior. Materials showed good biocompatibility with healthy human fibroblast in cell culture, as well as in vivo with zebrafish assay, suggesting newly synthesized hydrogel scaffolds as a potential new generation of hydrogel scaffolding biomaterials with tunable properties for versatile biomedical applications and tissue regeneration.

Highlights

  • IntroductionPublisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations

  • Fourier transform infrared spectroscopy (FTIR) provided an insight into structural characteristics of scaffolds based on alginate, gelatin, Hydroxyethyl methacrylate (HEMA), and HAp

  • Gelatin, HEMA, and HAp-based materials could be used for biomedical applications, we evaluated their toxicity in vivo using the zebrafish model

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Summary

Introduction

Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. A major challenge in regenerative engineering is the design and fabrication of a suitable scaffold, which can mimic the native extracellular matrix (ECM) to regenerate functional tissues In this respect, hydrogels are one of the most promising biomaterials based on their high water content, biocompatibility, and easy tunability for recreating the properties of the ECM [4]. We set a hydrogel scaffolding biomaterials platform of porous scaffolds based on alginate, gelatin, 2-hydroxyethyl methacrylate, with and without inorganic agent hydroxyapatite, which was fabricated by cryogelation and characterized to show that the proposed technique of synthesis provides favorable mechanical, morphological, and degradation properties, as well as in vitro and in vivo suitable biocompatible behavior, which is crucial to provide a desirable environment for the viability and survival of cells. The effect of the composition of hydrogel scaffolds on the aforementioned properties was investigated as well

Materials
Synthesis of Hydrogel Scaffolds
Synthesis Route of Hydroxyapatite
Characterization of Hydrogel Scaffolds
Porosity
Mechanical Properties Testing
Water Contact Angle
In Vitro Degradation Study
Biocompatibility Studies
Results and Discussion
Structural Characteristics
Morphology of Hydrogel Scaffolds
Porosity of Hydrogel Scaffolds
Mechanical Properties of Hydrogel Scaffolds
Hydrophilicity of Hydrogel Scaffolds
Degradation Behavior of Hydrogel Scaffolds
Biocompatibility of Hydrogel Scaffolds
Conclusions

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