Facile wound dressing replacement: Carbon dots for dissolving alginate hydrogels via competitive complexation

Area of Science:

• Materials Science
• Biomedical Engineering
• Nanotechnology

Background:

• Dissolvable hydrogels offer advantages in wound care by managing exudates and reducing pain during dressing changes.
• Copper-alginate hydrogels are utilized in wound dressings but present challenges during removal.

Purpose of the Study:

• To develop novel carbon dots (CDs) capable of efficiently capturing copper ions (Cu2+) from Cu2+-alginate hydrogels.
• To investigate the relationship between the composition of CDs, their Cu2+ complexation ability, and their efficacy in dissolving hydrogels.
• To evaluate the in vivo performance of CDs in promoting burn wound healing.

Main Methods:

• Synthesized carbon dots (CDs) using lysine and ethylenediamine, varying the ethylenediamine to lysine ratio.
• Assessed the Cu2+ complexation ability and cell viability of the synthesized CDs.
• Determined the dissolution rate of Cu2+-alginate hydrogels using different CD concentrations and compositions.
• Evaluated the in vivo effects of the replaced hydrogels on burn wound healing in animal models.

Main Results:

• CDs synthesized with a higher ethylenediamine to lysine ratio exhibited enhanced Cu2+ complexation.
• CD1/4 at 90 mg/mL dissolved Cu2+-alginate hydrogels in 16 minutes, twice as fast as lysine alone.
• In vivo studies demonstrated that the replaced hydrogels improved hypoxic conditions, reduced inflammation, and accelerated burn wound healing.

Conclusions:

• Carbon dots with strong Cu2+ complexation capabilities can effectively dissolve Cu2+-alginate hydrogels.
• This approach offers a promising strategy for facile and less painful wound dressing replacement.
• The developed CDs hold significant potential for advanced wound care applications.