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Strengthening gelatin hydrogels using the Hofmeister effect
Xujie Wang1, Congde Qiao1, Song Jiang1
1School of Materials Science and Engineering, State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology (Shandong Academy of Sciences), Daxue Rd. 3501, Jinan 250353, P. R. China. cdqiao@qlu.edu.cn.
Soft Matter
|December 18, 2020
Summary
Citrate anions enhance gelatin hydrogel strength by promoting triple helix formation during dehydration. This study reveals the mechanism behind improved mechanical properties for advanced biomaterial applications.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Polymer Chemistry
Background:
- Hydrogels possess tunable properties but often lack sufficient mechanical strength for demanding applications.
- The strengthening mechanisms of hydrogels, particularly protein-based ones, require further elucidation.
- Citrate anions are known kosmotropes that can influence polymer hydration and interactions.
Purpose of the Study:
- To investigate the effect of citrate anions on the structure and mechanical properties of gelatin hydrogels.
- To elucidate the strengthening mechanism induced by citrate in gelatin hydrogels.
- To explore the potential of citrate-modified gelatin hydrogels in new applications.
Main Methods:
- Fabrication of gelatin hydrogels via a soaking treatment in citrate solutions.
- Mechanical testing to evaluate hydrogel strength, modulus, and toughness.
- Structural analysis to correlate citrate concentration with gelatin molecular interactions and helix formation.
Main Results:
- Gelatin hydrogels fabricated with citrate exhibited simultaneously high strength, modulus, and toughness.
- Citrate-induced dehydration facilitated interactions among gelatin molecules, leading to helix structure formation.
- Increased citrate concentration correlated with higher content and length of gelatin triple helices, enhancing mechanical properties.
Conclusions:
- Citrate anions effectively improve the mechanical performance of gelatin hydrogels.
- The strengthening mechanism involves citrate-mediated dehydration and the promotion of gelatin triple helix formation.
- These enhanced hydrogels show promise for advanced applications in protein-based materials.
