Chlorella vulgaris Extract-Decorated Gold Nanoparticle Hybridized Antimicrobial Hydrogel as a Potential Dressing

This study reports a novel design of a moisturizing and antimicrobial hydrogel with injectable properties, using a green solvent (glycerol) as a cross-linking agent and gold nanoparticle reduced by Chlorella extract as an antimicrobial approach. We have synthesized gold nanoparticles (AuNPs) with environmentally friendly and bio-safe properties using Chlorella aqueous extracts (AuNPs@Chlorella). Characterization of the nanoparticles by ultraviolet-visible spectroscopy (UV-Vis), Fourier transform infrared spectroscopy (FTIR), Raman spectrum, and transmission electron microscope (TEM) confirmed that spherical AuNPs with the particle size of 10-20 nm were successfully synthesized. An analysis of the enhancement of the stability of gelatin hydrogels by the addition of glycerol and AuNPs was performed by rheometry. In addition, we also used Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) to confirm the good antibacterial activity. Therefore, the as-prepared gelatin-glycerol hydrogels containing AuNPs@Chlorella are most likely promising alternatives for wound healing dressings.

Automated summary

This study presents a new design of a moisturizing and antimicrobial hydrogel using a green solvent (glycerol) as a cross-linking agent and gold nanoparticles reduced by Chlorella extract as an antimicrobial approach. The synthesized gold nanoparticles (AuNPs@Chlorella) showed environmentally friendly and bio-safe properties. Rheometry analysis confirmed the enhanced stability of the gelatin hydrogels with the addition of glycerol and AuNPs. The gelatin-glycerol hydrogels containing AuNPs@Chlorella are potentially promising alternatives for wound healing dressings.