Biogenic gold nanoparticles from Gelidiella acerosa: bactericidal and photocatalytic degradation of two commercial dyes

초록

In this study, marine red seaweed (Gelidiella acerosa) was employed to generate biogenic gold nanoparticles (AuNPs) for antibacterial activity against (Staphylococcus aureus), and to evaluate their photocatalytic degradation of dyes. The bioreduced AuNPs were characterized using high-throughput techniques, such as UV-Vis spectroscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, and X-ray powder diffraction. The following observation was made: (1) a qualitative shift from colorless to ruby red authenticate the formation of AuNPs; (2) phenolics and polysaccharides play an essential role in the stabilization of AuNPs; (3) the as-prepared AuNPs were between 5 - 20 nm in diameter and spherical; (4) the AuNPs effectively kill S. aureus as evidence by fluorescence microscopic studies; (5) upon exposure to sunlight, AuNPs degrade commercially important dyes, especially methylene blue and rhodamine B. The results confirmed that AuNPs of G. acerosa can be an excellent source for biomedical and environmental applications.

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