Injectable Silver Nanoparticle-Based Hydrogel Dressings with Rapid Shape Adaptability and Antimicrobial Activity

Area of Science:

• Biomaterials Science
• Wound Healing Research
• Nanotechnology

Background:

• Traditional hydrogel dressings face limitations in managing deep wounds from burns and scalds, particularly concerning debridement and inflammation.
• Effective wound management requires dressings that are adaptable, possess antimicrobial properties, and promote healing.
• Developing advanced wound dressings is crucial for improving patient outcomes in burn and scald treatment.

Purpose of the Study:

• To develop an antibacterial, injectable, and self-healing hydrogel for advanced wound dressing applications.
• To synthesize a novel hydrogel (ADCM@Ag) using carboxymethyl chitosan (CMCS) and aldehyde-functionalized dextran (AD) with in situ silver ion reduction.
• To evaluate the physicochemical properties, biocompatibility, and antimicrobial efficacy of the developed hydrogel for potential use in treating deep wounds.

Main Methods:

• Fabrication of the ADCM@Ag hydrogel via in situ green reduction of silver ions and Schiff base reaction.
• Characterization using Scanning Electron Microscopy (SEM) for structural analysis.
• Assessment of swelling, enzymatic degradation, mechanical properties, injectability, shape adaptability, and self-healing capabilities.
• In vitro evaluation of cytotoxicity and cell compatibility.
• Antimicrobial assays against Gram-negative and Gram-positive bacteria.

Main Results:

• The ADCM@Ag hydrogel exhibited a porous structure, excellent fluid absorption, and biodegradability.
• The hydrogel demonstrated good mechanical properties suitable for application on animal wounds.
• Injectability, shape adaptability, and self-healing properties were confirmed.
• The hydrogel showed good cell compatibility, avoiding silver ion-induced cytotoxicity.
• Potent bactericidal effects against both Gram-negative and Gram-positive bacteria were observed, with over 85% killing efficacy.

Conclusions:

• The developed ADCM@Ag hydrogel possesses desirable properties including injectability, self-healing, biodegradability, and potent antimicrobial activity.
• This novel hydrogel demonstrates excellent biocompatibility and mechanical integrity for wound dressing applications.
• ADCM@Ag hydrogel shows significant potential as an advanced wound dressing for managing deep wounds, particularly those resulting from burns and scalds.