Designing a Nitro-Induced Sutured Biomacromolecule to Engineer Electroconductive Adhesive Hydrogels

Area of Science:

• Biomaterials Science
• Organic Chemistry
• Biomedical Engineering

Background:

• Nitro-functionality is biologically important and has therapeutic potential, but its role in macroscopic material properties is unclear.
• Nitro groups strongly withdraw electrons, influencing molecular properties and cellular processes.
• Dopamine, a neurotransmitter, is a potential scaffold for developing new biomaterials.

Purpose of the Study:

• To chemically modify dopamine with a nitro-group to create a novel multifunctional biomaterial.
• To explore how nitro-group incorporation influences the electronic and adhesive properties of biomaterials.
• To develop a biomaterial for therapeutic applications, focusing on tissue repair and sealing.

Main Methods:

• Chemical modification of dopamine with a nitro-group.
• Synthesis of a macromolecular structure via radical transfer mechanism (sutured-nitrocatecholic strand - S-nCAT).
• Incorporation of S-nCAT into a gelatin-based hydrogel and characterization of its properties.

Main Results:

• The nitro-group perturbed aromatic electron density but facilitated macromolecular suturing.
• The S-nCAT hydrogel exhibited electroconductivity due to π-electron delocalization.
• The hydrogel retained catechol-mediated adhesion and showed excellent mechano-physical properties.
• In vitro and in vivo studies confirmed the cytocompatibility of the engineered hydrogel.

Conclusions:

• A novel chemical approach successfully designed a multifunctional biomaterial by manipulating electronic properties of bioactive molecules.
• The engineered hydrogel demonstrates potential for tissue repairing/sealing and other biomedical applications.
• This strategy offers a new pathway for developing advanced biomaterials with tailored functionalities.