Antifungal applications for nano-additives synthesized with a bio-based approach

BARBERIA-ROQUE, LEYANET; BELLOTTI, NATALIA; OBIDI, OLAYIDE FOLASHADE; GÁMEZ-ESPINOSA, ERASMO; DEYÁ, CECILIA; BARBERIA-ROQUE, LEYANET; BELLOTTI, NATALIA; OBIDI, OLAYIDE FOLASHADE; GÁMEZ-ESPINOSA, ERASMO; DEYÁ, CECILIA

Advances in Natural Sciences: Nanoscience and Nanotechnology

IOP Publishing

Año: 2020 vol. 11 p. 1 - 11

2043-6262

Filamentous fungi are microorganisms that cause deterioration of structural materials due to theirecological plasticity and vegetative functions. Functionalised sol-gel based products can be usedto control this kind of biodeterioration through the association to antifungal active additiveswhich are trapped in the siloxane crosslinking. Bioactive additives and materials to controlmicrobial growth have been gaining more attention over the years. However, due to the concernabout their toxicity, bio-based approach has been explored. The aim of the present research wasto obtain antifungal additives with nanoparticles synthesised with aqueous extract of Sennaoccidentalis L and silver or copper salts to obtain a functionalised sol-gel based product tocontrol the biodeterioration of bricks. Nanoparticles were characterised by UV?vis spectroscopy,transmission electron microscopy and x-ray diffraction. Silver nanoparticles (15 nm) showedhigher stability over time and proved to be active against Aspergillus versicolor andCladosporium cladosporioides which were isolated from brick wall. The strains were selecteddue to their high frequency in mycobiota of biodeteriorated structural building materials. Thesilver nanoparticles were successfully integrated in a silane-based matrix to be applied in bricks.The samples were characterised by surface tension determination, contact angle measurement,water absorption determination, scanning electron microscopy and energy dispersive x-rayspectroscopy. Bricks with the lower concentration (2%) of the functionalised silane (3-mercaptopropyltrimethoxy) showed to be efficient to prevent fungal biofilm development with100% of inhibition against both strains.Keywords: functional coating, nanoparticle, green synthesis, antifungal additive, biodeterioration