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Valorisation of the invasive macroalgae Undaria pinnatifida (Harvey) Suringar for the green synthesis of gold and silver nanoparticles with antimicrobial and antioxidant potential

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Resumo:Bacterial and fungal infections are a challenging global problem due to the reported increasing resistance of pathogenic microorganisms to conventional antimicrobials. Nanomaterials are a promising strategy to fight infections caused by multidrug-resistant microbes. In this work, gold (Au@UP) and silver (Ag@UP) nanoparticles were produced for the first time by green synthesis using an aqueous extract of the invasive macroalgae <i>Undaria pinnatifida</i> (UP). The nanoparticles were characterized by a wide range of physicochemical techniques. Au@UP and Ag@UP demonstrated to be spherical and crystalline with an average size of 6.8 ± 1.0 nm and 14.1 ± 2.8 nm, respectively. Carbohydrates and proteins of the UP extract may participate in the synthesis and capping of the nanoparticles. The UP extract, Ag@UP, and Au@UP were assessed for their antimicrobial activity against <i>Escherichia coli</i>, <i>Staphylococcus aureus, Pseudomonas aeruginosa, Candida albicans</i>, and <i>Candida auris.</i> Ag@UP showed the highest antimicrobial activity with very low MIC and MBC values for all the tested bacteria, and Au@UP demonstrated to be very effective against biofilm-producing bacteria. The antifungal properties of both Ag@UP and Au@UP were remarkable, inhibiting hyphae formation. This study points towards a very promising biomedical exploitation of this invasive brown algae.
Autores principais:González-Ballesteros, Noelia
Outros Autores:Fernandes, Mário; Machado, Raul; Sampaio, Paula; Gomes, Andreia C.; Cavazza, Antonella; Bigi, Franca; Rodríguez-Argüelles, Maria Carmen
Assunto:Undaria pinnatifida Green synthesis Silver nanoparticles Gold nanoparticles Antibacterial activity Antifungal activity
Ano:2023
País:Portugal
Tipo de documento:artigo
Tipo de acesso:acesso aberto
Instituição associada:Universidade do Minho
Idioma:inglês
Origem:RepositóriUM - Universidade do Minho

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