Nanoparticles synthesised from Caesalpinia spinosa: assessment of the antifungal effects in protective systems

GÁMEZ-ESPINOSA, ERASMO; DEYÁ, CECILIA; CABELLO, MARTA; BELLOTTI, NATALIA

Advances in Natural Sciences: Nanoscience and Nanotechnology

IOP Publishing

Lugar: Inglaterra; Año: 2021 vol. 12 p. 1 - 9

2043-6262

Green chemistry is the preferred approach for the synthesis of metal and metal oxidenanoparticles due to its environmental friendliness, feasibility, and safety to human health whencompared with other chemical or physical methods. Caesalpinia spinosa is a promising resourceto be applied in the green synthesis of metallic nanoparticles due to the high amount ofpolyphenols. The aim of the present research was to obtain an antifungal coating functionalisedwith nanoparticles synthesised from C. spinosa tannin and aqueous solutions of metallic (silverand copper) salts to control biodeterioration of acrylic paints and bricks. Green synthesised NPswere characterised by UV-vis spectroscopy, transmission electron microscopy (TEM), Fouriertransformed infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and energydispersive x-ray spectroscopy (EDS). The silver nanoparticles with average size of 12 nm andobtained from a 500 ppm aqueous solution of C. spinosa tannin inhibited the growth ofAspergillus niger, Penicillium commune and Lasiodiplodia theobromae. These strains werepreviously isolated from a biodeteriorated facade. Functionalised coating obtained with silvernanoparticles synthesised from C. spinosa tannin is reported for the first time as antifungalprotective system of acrylic paints and bricks.