Assessing the Fate of Superparamagnetic Iron Oxide Nanoparticles Carrying Usnic Acid as Chemical Cargo on the Soil Microbial

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Pontes, Montcharles S. ; Santos, Jaqueline Silva ; Silva, Jose Luiz da ; Miguel, Thaiz B. A. R. ; Miguel, Emilio Castro ; Souza Filho, Antonio G. ; Garcia, Flavio ; Lima, Sandro Marcio ; Andrade, Luis Humberto da Cunha ; Arruda, Gilberto J. ; Grillo, Renato ; Caires, Anderson R. L. ; Santiago, Etenaldo Felipe

• Tipo de documento: Artigo Científico
• Fonte: ACS NANO; v. 17, n. 8, p. 14-pg., 2023-03-06.

Resumo

In the present study we evaluate the effect of superparamagnetic iron oxide nanoparticles (SPIONs) carrying usnic acid (UA) as chemical cargo on the soil microbial community in a dystrophic red latosol (oxysol). Herein, 500 ppm UA or SPIONs-framework carrying UA were diluted in sterile ultrapure deionized water and applied by hand sprayer on the top of the soil. The experiment was conducted in a growth chamber at 25 degrees C, with a relative humidity of 80% and a 16 h/8 h light-dark cycle (600 lx light intensity) for 30 days. Sterile ultrapure deionized water was used as the negative control; uncapped and oleic acid (OA) capped SPIONs were also tested to assess their potential effects. Magnetic nanostructures were synthesized by a coprecipitation method and characterized by scanning and transmission electron microscopy (SEM and TEM), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), zeta potential, hydrodynamic diameter, magnetic measurements, and release kinetics of chemical cargo. Uncapped and OA-capped SPIONs did not significantly affect soil microbial community. Our results showed an impairment in the soil microbial community exposed to free UA, leading to a general decrease in negative effects on soil-based parameters when bioactive was loaded into the nanoscale magnetic carrier. Besides, compared to control, the free UA caused a significant decrease in microbial biomass C (39%), on the activity of acid protease (59%), and acid phosphatase (23%) enzymes, respectively. Free UA also reduced eukaryotic 18S rRNA gene abundance, suggesting a major impact on fungi. Our findings indicate that SPIONs as bioherbicide nanocarriers can reduce the negative impacts on soil. Therefore, nanoenabled biocides may improve agricultural productivity, which is important for food security due to the need of increasing food production. (AU)

• Processo FAPESP: 22/00045-3 - Respostas ao estresse antioxidante de plantas de soja cultivadas na presença de nanopartículas projeto (18/25207-0): Nanometalômica aplicada ao cultivo da soja para estudar os efeitos das nanopartículas relacionadas a metal
• Beneficiário: Jaqueline da Silva Santos
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 22/03219-2 - Desenvolvimento de suprapartículas híbridas multifuncionais como potencial material sustentável para liberação de insumos agrícolas
• Beneficiário: Renato Grillo
• Modalidade de apoio: Auxílio à Pesquisa - Projeto Inicial