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Related Concept Videos

Reticular Dermis01:15

Reticular Dermis

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The papillary and reticular dermis are the two layers of the dermis. They are made of connective tissue with fibers of collagen extending from one to the other, making the border between the two somewhat indistinct. The dermal papillae extending into the epidermis belong to the papillary layer, whereas the dense collagen fiber bundles below belong to the reticular layer.
Reticular Layer
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Fibrous proteins are either long and narrow proteins or assemble to form long and thin structures. They contain repetitive units and usually consist of either alpha helices or beta sheets and, in rare cases, a mix of both. The amino acids in the primary structure often consist of repeating amino acid sequences. The role of fibrous proteins is primarily structural. Many are located in the extracellular matrix and are present in connective tissues to impart strength and joint mobility. They are...
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Related Experiment Video

Updated: May 6, 2026

Designing Silk-silk Protein Alloy Materials for Biomedical Applications
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Enzyme-Modified DOPA-Containing Silk Fibroin Bioadhesives with Dynamic Cross-Linking Properties.

Yurong Tan1,2, Haopeng Li1, Xiao Han3

  • 1Mechano-X Institute, Applied Mechanics Laboratory, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China.

ACS Applied Materials & Interfaces
|February 19, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a new silk-based hydrogel using an enzymatic cross-linking strategy. This bioadhesive offers rapid gelation, strong adhesion, and self-healing for advanced bioelectronic applications.

Keywords:
dynamic cross-linkinghuman−machine interfacesinterstitial skin fluidrecombinant tyrosinasesilk fibroin bioadhesives

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Bioelectronics

Background:

  • Silk fibroin (SF) hydrogels struggle with simultaneous rapid gelation, mechanical strength, self-healing, and adhesion for epidermal bioelectronics.
  • Current limitations arise from inefficient cross-linking and a lack of active adhesive components.

Purpose of the Study:

  • To develop high-performance, all-silk bioadhesives using an enzymatic dynamic cross-linking strategy.
  • To overcome the limitations of traditional SF hydrogels for advanced bioelectronic interfaces.

Main Methods:

  • Engineered tyrosinase (TYR) selection for improved DOPA conversion in SF.
  • Utilized pH-triggered Fe3+ coordination for dynamic cross-linking.
  • Fabricated and characterized silk-based hydrogels for mechanical properties, adhesion, and self-healing.

Main Results:

  • Identified a bacterial tyrosinase with a 6.8-fold higher DOPA conversion yield (2.7 mol%) compared to commercial enzymes.
  • Formed hydrogels with tunable mechanical properties (3-13 kPa modulus, >250% strain) and high adhesion (18-40 kPa).
  • Demonstrated excellent self-healing capabilities, biocompatibility, and successful integration into a wearable sweat sensor.

Conclusions:

  • Established a generalizable enzymatic strategy for creating pure protein-based dynamic hydrogels.
  • The developed bioadhesives are suitable for advanced biointerfaces, including epidermal bioelectronics and wearable sensors.
  • This approach enables the design of high-performance silk biomaterials with tailored properties.