A biocide delivery system composed of nanosilica loaded with neem oil is effective in reducing plant toxicity of this biocide.

Autor: Goetten de Lima G; Graduate Program in Engineering and Science of Materials - PIPE, Federal University of Paraná - UFPR, 81.531-990, Curitiba, PR, Brazil; Materials Research Institute, Athlone Institute of Technology, Athlone, Ireland., Wilke Sivek T; Department of Genetics, Federal University of Paraná, Curitiba, PR, Brazil., Matos M; Graduate Program in Engineering and Science of Materials - PIPE, Federal University of Paraná - UFPR, 81.531-990, Curitiba, PR, Brazil., Lundgren Thá E; Department of Genetics, Federal University of Paraná, Curitiba, PR, Brazil., de Oliveira KMG; Department of Genetics, Federal University of Paraná, Curitiba, PR, Brazil., Rodrigues de Souza I; Department of Genetics, Federal University of Paraná, Curitiba, PR, Brazil., de Morais de Lima TA; Materials Research Institute, Athlone Institute of Technology, Athlone, Ireland., Cestari MM; Department of Genetics, Federal University of Paraná, Curitiba, PR, Brazil., Esteves Magalhães WL; Embrapa Forestry - Brazilian Agricultural Research Agency, Colombo, PR, Brazil., Hansel FA; Embrapa Forestry - Brazilian Agricultural Research Agency, Colombo, PR, Brazil., Morais Leme D; Department of Genetics, Federal University of Paraná, Curitiba, PR, Brazil. Electronic address: daniela.leme@ufpr.br.
Jazyk: angličtina
Zdroj: Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2022 Feb 01; Vol. 294, pp. 118660. Date of Electronic Publication: 2021 Dec 08.
DOI: 10.1016/j.envpol.2021.118660
Abstrakt: One possible way to reduce the environmental impacts of pesticides is by nanostructuring biocides in nanocarriers because this promotes high and localized biocidal activity and can avoid toxicity to non-target organisms. Neem oil (NO) is a natural pesticide with toxicity concerns to plants, fish, and other organisms. Thus, loading NO in a safe nanocarrier can contribute to minimizing its toxicity. For this study, we have characterized the integrity of a nanosilica-neem oil-based biocide delivery system (SiO 2 NP#NO BDS) and evaluated its effectiveness in reducing NO toxicity by the Allium cepa test. NO, mainly consisted of unsaturated fatty acids, was well binded to the SiO 2 NP with BTCA crosslinker. Overall, this material presented all of its pores filled with the NO with fatty acid groups at both the surface and bulk level of the nanoparticle. The thermal stability of NO was enhanced after synthesis, and the NO was released as zero-order model with a total of 20 days without burst release. The SiO 2 NP#NO BDS was effective in reducing the individual toxicity of NO to the plant system. NO in single form inhibited the seed germination of A. cepa (EC 50 of 0.38 g L -1 ), and the effect was no longer observed at the BDS condition. Contrarily to the literature, the tested NO did not present cyto- and geno-toxic effects in A. cepa, which may relate to the concentration level and composition.
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Databáze: MEDLINE
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