Antifungal Properties of Silver Nanoparticles Produced by Green Synthesis with Extract of Red Seaweed Chondracanthus chamissoi

The green synthesis of metal nanoparticles is an eco-friendly and promising approach for various applications including silver nanopesticides with seaweed extract. The aim of the research has been to synthesize silver nanoparticles (AgNPs), using extract of red seaweed Chondracanthus chamissoi and evaluate their antifungal properties. The methodology consisted in the aqueous extraction of the seaweed and combination with an AgNO3 solution in hot. The crystallinity, morphology and chemical composition were studied by XRD, SEM and EDS. Antifungal tests were carried out againt the fungus Fusarium Solani, three doses of AgNPs (10 %, 20 % and 30 %) were applied under laboratory conditions. The diffractogram revealed AgCl as the main phase and Ag as the secondary phase. The SEM showed cubes de AgCl with a size of ~350 nm and Ag spherical nanoparticles (NPs) with a size of ~55 nm, while AgNPs decorated the AgCl cubes. This AgCl size could be related to partial reductions or unreacted ions. The antifungal activity showed a greater efficacy of AgNPs the increase in the AgNPs dose decreased the growth of F. solani, the 30 % AgNPs dose did not record the diameter of the fungus. It is concluded that the AgNPs produced by green synthesis using the red seaweed Chondracanthus chamissoi turns out to be an effective process for its application as an antifungal product.