Eu(3+)-mediated dual-crosslinked collagen-mimetic peptide/sodium alginate hydrogel for 3D-printed skin wound dressings.
Collagen-mimetic peptide hydrogels just got a serious upgrade. Researchers in China built a dual-crosslinked system combining collagen-mimetic peptides and sodium alginate, held together by europium ions. The result? A 3D-printable hydrogel with robust mechanical strength, high bioactivity, and impressive print fidelity. This isn’t just another soft gel — it’s designed to hold up in real tissue engineering scenarios.
Int J Biol Macromol
by Wei G, Quan S, Zhang J et al.
“Eu(3+)-mediated dual-crosslinked collagen-mimetic peptide/sodium alginate hydrogel for 3D-printed skin wound dressings. Wei G(1), Quan S(1), Zhang J(1), Shi S(1), Nian L(2), He H(3), Xiao J(4). Author information: (1)State Key Laboratory of Natural Product Chemistry, College of Chemistry and Chemical Engineering, Lanzhou, 730000, China; Gansu Engineering Research Center of Medical Collagen, Lanzhou, 730000, China. (2)School of Life Science, Lanzhou University, Lanzhou, 730000, China; Gansu Engineering Research Center of Medical Collagen, Lanzhou, 730000, China. (3)School of Life Science, Lanzhou University, Lanzhou, 730000, China; Gansu Engineering Research Center of Medical Collagen, Lanzhou, 730000, China. Electronic address: hehuix@lzu.edu.cn. (4)State Key Laboratory of Natural Product Chemistry, College of Chemistry and Chemical Engineering, Lanzhou, 730000, China; Gansu Engineering Research Center of Medical Collagen, Lanzhou, 730000, China. Electronic address: xiaojx@lzu.edu.cn. The development of multifunctional bioinks that simultaneously possess robust mechanical properties, bioactivity, and high printability remains a central challenge in tissue engineering. In this study, a biofunctional 3D-printable hydrogel based on a collagen-mimetic peptide (CMP) and sodium alginate (SA) was constructed for the treatment of full-thickness skin defects. Europium ions (Eu3+) coordinated with both the carboxyl groups of SA and the aspartic acid residues of the CMP-DD peptide, forming a reinforced dual-network structure with enhanced stability and mechanical strength, which enables precise extrusion-based 3D printing with excellent shape fidelity. Subsequent incorporation of calcium ions (Ca2+) for secondary crosslinking further endows the hydrogel with tunable elasticity and superior structural durability. The composite hydrogel significantly promoted cell adhesion and proliferation, while exhibiting pronounced antibacterial and anti-inflammatory properties. In a Sprague-Dawley rat full-thickness skin defect model, it significantly accelerates wound healing, enhances granulation tissue formation, promotes collagen deposition, and improves re-epithelialization. This dual-coordination CMP-based composite hydrogel integrates outstanding mechanical performance, bioactivity, and printability, offering an innovative and promising strategy for the design of high-performance bioinks and the advancement of skin tissue regeneration. Copyright © 2026. Published by Elsevier B.V. Conflict of interest statement: Declaration of competing interest The authors declare no competing conflict of interests.”
Here’s the play-by-play. Europium ions (Eu3+) act as molecular “connectors,” binding with both the alginate’s carboxyl groups and the aspartic acid residues in the peptide sequence. That forms a stable dual-network. Then, calcium ions come in as backup, adding a second layer of crosslinking. The two-step process tunes the hydrogel’s elasticity and durability, giving researchers more control over the final product.
Why bother? Because this composite hydrogel isn’t just tough — it’s bioactive. It promotes cell adhesion and proliferation, and knocks out bacteria and inflammation. In rat models, wounds healed faster, with better granulation, more collagen laid down, and quicker re-epithelialization. That’s a solid win for anyone researching next-gen wound dressings or tissue scaffolds.
Key takeaway: Dual-crosslinked, 3D-printable peptide hydrogels are pushing the boundaries of what’s possible in tissue engineering. This is the kind of innovation that could turn bioink from a niche tool into a standard in regenerative research.
If you’re tracking developments in biomaterials, or looking for inspiration for your own protocols, this one’s worth a deeper dive. For more on the latest in peptide innovation, check the peptide research index. If you’re sourcing materials or considering vendors, our vendor directory has you covered. Peptide research isn’t slowing down — neither should you.
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