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A platform for research: civil engineering, architecture and urbanism
A sepiolite-based formulation for slow release of the herbicide mesotrione
https://orcid.org/0000-0001-8116-7379
Abstract A slow release formulation (SRF) of the herbicide mesotrione (MS) [2-(4-mesyl-2-nitrobenzoyl)cyclohexane-1,3-dione] was designed for extended weed control relative to that of conventional formulations. The SRF was designed by incorporating the herbicide in micelles formed by the fatty amine ethoxylated surfactant Ethomeen T/15 (ET15) followed by their further sorption on the clay mineral sepiolite. The content of active substance (a.s.) was very high, 16.8% w.w. The surfactant per se was adsorbed by developing surface aggregates on sepiolite's surface. FTIR spectroscopy and zeta potential measurements demonstrated that electrostatic interactions were responsible of the sorption of MS by using micelles loaded with the herbicide, modifying the conformation of ET15 on sepiolite. Toxicity assays by using Microtox® tests yielded a value of IC50 for the SRF (52.6 ± 3.6 mg L−1) that was one order of magnitude higher than that reported for the commercial formulation Callisto® (1.1 ± 0.1 mg L−1). In vitro water release experiments stated that the release of MS was a controlled-diffusion process. Application of SRF and Callisto® as post-emergence in field trials of maize showed that after 10 days of treatment (DAT), the amount in the soil of the herbicide from the SRF was about two-fold higher than that of Callisto®, with a larger accumulation (42% of the total) in the upper soil layer (0–10 cm depth). No significant differences in soil accumulation at longer times and in the crop yield were observed. Consequently, the use of the designed sepiolite-based formulation significantly reduced MS leaching over the conventional formulation while maintaining the desired bioactivity for weed control.
Graphical abstract Display Omitted
Highlights A sepiolite-based formulation with a high loading of mesotrione was obtained Slow release was due to electrostatic interactions of mesotrione with the surfactant Reduced toxicity of sepiolite-based formulation over the conventional one. Similar bioefficacy of sepiolite-based and commercial formulations in field trials
A sepiolite-based formulation for slow release of the herbicide mesotrione
https://orcid.org/0000-0001-8116-7379
Abstract A slow release formulation (SRF) of the herbicide mesotrione (MS) [2-(4-mesyl-2-nitrobenzoyl)cyclohexane-1,3-dione] was designed for extended weed control relative to that of conventional formulations. The SRF was designed by incorporating the herbicide in micelles formed by the fatty amine ethoxylated surfactant Ethomeen T/15 (ET15) followed by their further sorption on the clay mineral sepiolite. The content of active substance (a.s.) was very high, 16.8% w.w. The surfactant per se was adsorbed by developing surface aggregates on sepiolite's surface. FTIR spectroscopy and zeta potential measurements demonstrated that electrostatic interactions were responsible of the sorption of MS by using micelles loaded with the herbicide, modifying the conformation of ET15 on sepiolite. Toxicity assays by using Microtox® tests yielded a value of IC50 for the SRF (52.6 ± 3.6 mg L−1) that was one order of magnitude higher than that reported for the commercial formulation Callisto® (1.1 ± 0.1 mg L−1). In vitro water release experiments stated that the release of MS was a controlled-diffusion process. Application of SRF and Callisto® as post-emergence in field trials of maize showed that after 10 days of treatment (DAT), the amount in the soil of the herbicide from the SRF was about two-fold higher than that of Callisto®, with a larger accumulation (42% of the total) in the upper soil layer (0–10 cm depth). No significant differences in soil accumulation at longer times and in the crop yield were observed. Consequently, the use of the designed sepiolite-based formulation significantly reduced MS leaching over the conventional formulation while maintaining the desired bioactivity for weed control.
Graphical abstract Display Omitted
Highlights A sepiolite-based formulation with a high loading of mesotrione was obtained Slow release was due to electrostatic interactions of mesotrione with the surfactant Reduced toxicity of sepiolite-based formulation over the conventional one. Similar bioefficacy of sepiolite-based and commercial formulations in field trials
A sepiolite-based formulation for slow release of the herbicide mesotrione
https://orcid.org/0000-0001-8116-7379
Abstract A slow release formulation (SRF) of the herbicide mesotrione (MS) [2-(4-mesyl-2-nitrobenzoyl)cyclohexane-1,3-dione] was designed for extended weed control relative to that of conventional formulations. The SRF was designed by incorporating the herbicide in micelles formed by the fatty amine ethoxylated surfactant Ethomeen T/15 (ET15) followed by their further sorption on the clay mineral sepiolite. The content of active substance (a.s.) was very high, 16.8% w.w. The surfactant per se was adsorbed by developing surface aggregates on sepiolite's surface. FTIR spectroscopy and zeta potential measurements demonstrated that electrostatic interactions were responsible of the sorption of MS by using micelles loaded with the herbicide, modifying the conformation of ET15 on sepiolite. Toxicity assays by using Microtox® tests yielded a value of IC50 for the SRF (52.6 ± 3.6 mg L−1) that was one order of magnitude higher than that reported for the commercial formulation Callisto® (1.1 ± 0.1 mg L−1). In vitro water release experiments stated that the release of MS was a controlled-diffusion process. Application of SRF and Callisto® as post-emergence in field trials of maize showed that after 10 days of treatment (DAT), the amount in the soil of the herbicide from the SRF was about two-fold higher than that of Callisto®, with a larger accumulation (42% of the total) in the upper soil layer (0–10 cm depth). No significant differences in soil accumulation at longer times and in the crop yield were observed. Consequently, the use of the designed sepiolite-based formulation significantly reduced MS leaching over the conventional formulation while maintaining the desired bioactivity for weed control.
Graphical abstract Display Omitted
Highlights A sepiolite-based formulation with a high loading of mesotrione was obtained Slow release was due to electrostatic interactions of mesotrione with the surfactant Reduced toxicity of sepiolite-based formulation over the conventional one. Similar bioefficacy of sepiolite-based and commercial formulations in field trials
A sepiolite-based formulation for slow release of the herbicide mesotrione
del Carmen Galán-Jiménez, María (author) / Morillo, Esmeralda (author) / Bonnemoy, Frédérique (author) / Mallet, Clarisse (author) / Undabeytia, Tomás (author)
Applied Clay Science ; 189
2020-02-11
Article (Journal)
Electronic Resource
English
Organohydrotalcites as novel supports for the slow release of the herbicide terbuthylazine
| Online Contents | 2008
Organohydrotalcites as novel supports for the slow release of the herbicide terbuthylazine
| Online Contents | 2008