Abstract

The production, categorization and appliance of naturally synthesized nanomaterials are a key aspect in
nanotechnology. The present study deals with the synthesis of gold nanoparticles (AuNPs) using aqueous
extract of brown seaweed Dictyota bartayresiana as the reducing agent. Green synthesis of gold nanoparticles
was preliminarily confirmed by color changing from yellow to dark pink in the reaction mixture and the broad
surface plasmon resonance band was centered at 548 to 564 nm which indicates the polydispersed
nanoparticles. Scanning electron microscopy showed the morphology and crystalline structure of green
synthesized gold nanoparticles. The carboxylic, amine and polyphenolic groups were associated with the green
synthesized gold nanoparticles which were confirmed by Fourier Transform Infra-Red (FT-IR) spectroscopy.
The antifungal effects of the AuNPs were studied against Humiclo insulans and Fusarium dimerum. The present
study indicates that AuNPs has considerable antifungal activity, in comparison with other antifungal drugs.