Applications of leaves-mediated gold nanoparticles in cosmetics relation to antioxidant, moisture retention, and whitening effect on B16BL6 cells.

BACKGROUND

Bioactive compounds in plant extracts are able to reduce metal ions to nanoparticles through the process of green synthesis. is an oriental medicinal herb and an adaptogen which has been historically used to cure various diseases. In addition, the leaves-mediated gold nanoparticles are the value-added novel materials. Its potential as a cosmetic ingredient is still unexplored. The aim of this study was to evaluate the antioxidant, moisture retention and whitening properties of gold nanoparticles (AuNPs) in cosmetic applications.

METHODS

Cell-free experiments were performed to evaluate AuNP's antioxidant and moisture retention properties and inhibition activity on mushroom tyrosinase. Furthermore, cell cytotoxicity was evaluated using normal human dermal fibroblast and murine B16BL6 melanoma cells (B16) after treatment with increasing concentrations of AuNPs for 24 h, 48 h, and 72 h. Finally, cell assays on B16 cells were performed to evaluate the whitening effect of AuNPs through reduction of cellular melanin content and tyrosinase activity.

RESULTS

DPPH radical scavenging assay results revealed that AuNPs exhibited antioxidant activity in a dose-dependent manner. AuNPs exhibited moisture retention capacity and effectively inhibited mushroom tyrosinase. In addition, 3-(4,5-dimethyl-thiazol-2yl)-2,5-diphenyl tetrazolium bromide results revealed that AuNPs were not toxic to human dermal fibroblast and B16 cells; in addition, they significantly reduced melanin content, tyrosinase activity, and mRNA expression of melanogenesis-associated transcription factor and tyrosinase in B16 cells.

CONCLUSION

Our study is the first report to provide evidence supporting that leaves-capped gold nanoparticles could be used as multifunctional ingredients in cosmetics.