A study by SAXS of silver nanoparticles produced by biogenic synthesis
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2024
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BRAZIL MRS MEETING, 22nd
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Nanotechnology applied to the agriculture has highlighted in recent decades, making
important contributions, for example, the use of nanoparticles produced by biogenic
processes to control phytopathogens. This demonstrates the need of better understand the
composition, mechanisms of action and toxicity of these nanoparticles. Their capping by
biomolecules, derived from the organism used in the synthesis, contributes to their stability
and biological activity. In particular, previous studies demonstrated the potential of Ag
nanoparticles to combat the white mold [1], a disease that affects important agricultural
species. In this study, Ag nanoparticles were produced by the fungus Trichoderma
harzianum in aqueous solutions containing silver nitrate as a precursor for the silver
nanoparticles. Some of the samples were exposed to the phytopathogenic fungus Sclerotinia
sclerotiorum responsible for the white mold. After preparation, a fraction of the samples
was submitted to physico-chemical processes to remove organic cap layer on nanoparticles
surface formed during the preparation process. We used the small angle X-ray scattering
(SAXS) technique to determine the effects of the phytopathogenic fungus and cap removal
process in the average radius, radius dispersion, and number density of the nanoparticles.
The SAXS data analyses suggest that the presence of the pathogenic fungus results in a
decrease in number and total volume of Ag NPs without significant changes on average
radius and radius dispersion. Our results also indicate that the physical-chemical process
applied to remove the organic cap surrounding the Ag NPs leads to a decrease in the
fraction of the smaller nanoparticles.
Como referenciar
RIBEIRO JUNIOR, ARI; YOKAICHIYA, FABIANO; KELLERMANN, GUINTHER; LIMA, RENATA de; GUILGER-CASAGRANDE, MARIANA; FRANCO, MARGARETH K.K.D.; FRACETO, LEONARDO F.; MONERJAN, ENELI; LEMKE, KARINA. A study by SAXS of silver nanoparticles produced by biogenic synthesis. In: BRAZIL MRS MEETING, 22nd, September 29 - October 3, 2024, Santos, SP. Abstract... São Carlos, SP: Aptor Software, 2024. p. 1454-1454. Disponível em: https://repositorio.ipen.br/handle/123456789/48931. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.