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Antibiotics 2018, 7(3), 76; https://doi.org/10.3390/antibiotics7030076

Silver Nanoparticles and Polyphenol Inclusion Compounds Composites for Phytophthora cinnamomi Mycelial Growth Inhibition

1
Department of Bioengineering of Horticultural and Viticultural Systems, University of Agricultural Sciences and Veterinary Medicine of Bucharest, Bulevardul Mărăști 59, București 011464, Romania
2
Agriculture and Forestry Engineering Department, ETSIIAA, Universidad de Valladolid, Avenida de Madrid 44, 34004 Palencia, Spain
3
Centro de Salud Barrio España, Sanidad de Castilla y León (SACYL), Calle de la Costa Brava, 4, 47010 Valladolid, Spain
4
Department of Agricultural and Environmental Sciences, EPS, Instituto de Investigación en Ciencias Ambientales (IUCA), University of Zaragoza, Carretera de Cuarte, s/n, 22071 Huesca, Spain
*
Author to whom correspondence should be addressed.
Received: 29 June 2018 / Revised: 8 August 2018 / Accepted: 15 August 2018 / Published: 16 August 2018
(This article belongs to the Special Issue Silver-Based Antimicrobials)
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Abstract

Phytophthora cinnamomi, responsible for “root rot” or “dieback” plant disease, causes a significant amount of economic and environmental impact. In this work, the fungicide action of nanocomposites based on silver nanoparticles and polyphenol inclusion compounds, which feature enhanced bioavailability and water solubility, was assayed for the control of this soil-borne water mold. Inclusion compounds were prepared by an aqueous two-phase system separation method through extraction, either in an hydroalcoholic solution with chitosan oligomers (COS) or in a choline chloride:urea:glycerol deep eutectic solvent (DES). The new inclusion compounds were synthesized from stevioside and various polyphenols (gallic acid, silymarin, ferulic acid and curcumin), in a [6:1] ratio in the COS medium and in a [3:1] ratio in the DES medium, respectively. Their in vitro response against Phytophthora cinnamomi isolate MYC43 (at concentrations of 125, 250 and 500 µg·mL−1) was tested, which found a significant mycelial growth inhibition, particularly high for the composites prepared using DES. Therefore, these nanocomposites hold promise as an alternative to fosetyl-Al and metalaxyl conventional systemic fungicides. View Full-Text
Keywords: antifungal; chitosan oligomers; composites; deep eutectic solvents; phenolic compounds; Phytophthora cinnamomi; root rot; silver nanoparticles antifungal; chitosan oligomers; composites; deep eutectic solvents; phenolic compounds; Phytophthora cinnamomi; root rot; silver nanoparticles
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Matei, P.M.; Martín-Gil, J.; Michaela Iacomi, B.; Pérez-Lebeña, E.; Barrio-Arredondo, M.T.; Martín-Ramos, P. Silver Nanoparticles and Polyphenol Inclusion Compounds Composites for Phytophthora cinnamomi Mycelial Growth Inhibition. Antibiotics 2018, 7, 76.

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