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Paulo S. Tonello  - - - 
Publication Record
Distribution of Articles published per year 
(2007 - 2011)
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Article 6 Reads 40 Citations Paraquat-loaded alginate/chitosan nanoparticles: Preparation, characterization and soil sorption studies Mariana Dos Santos Silva, Daniela Sgarbi Cocenza, Renato Gri... Published: 01 June 2011
Journal of Hazardous Materials, doi: 10.1016/j.jhazmat.2011.03.057
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Article 5 Reads 31 Citations Controlled release system for ametryn using polymer microspheres: Preparation, characterization and release kinetics in ... Renato Grillo, Anderson Do Espírito Santo Pereira, Nathalie ... Published: 01 February 2011
Journal of Hazardous Materials, doi: 10.1016/j.jhazmat.2010.12.044
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The purpose of this work was to develop a modified release system for the herbicide ametryn by encapsulating the active substance in biodegradable polymer microparticles produced using the polymers poly(hydroxybutyrate) (PHB) or poly(hydroxybutyrate-valerate) (PHBV), in order to both improve the herbicidal action and reduce environmental toxicity. PHB or PHBV microparticles containing ametryn were prepared and the efficiencies of herbicide association and loading were evaluated, presenting similar values of approximately 40%. The microparticles were characterized by scanning electron microscopy (SEM), which showed that the average sizes of the PHB and PHBV microparticles were 5.92±0.74 μm and 5.63±0.68 μm, respectively. The ametryn release profile was modified when it was encapsulated in the microparticles, with slower and more sustained release compared to the release profile of pure ametryn. When ametryn was associated with the PHB and PHBV microparticles, the amount of herbicide released in the same period of time was significantly reduced, declining to 75% and 87%, respectively. For both types of microparticle (PHB and PHBV) the release of ametryn was by diffusion processes due to anomalous transport (governed by diffusion and relaxation of the polymer chains), which did not follow Fick's laws of diffusion. The results presented in this paper are promising, in view of the successful encapsulation of ametryn in PHB or PHBV polymer microparticles, and indications that this system may help reduce the impacts caused by the herbicide, making it an environmentally safer alternative.
Article 5 Reads 4 Citations Determination of labile inorganic and organic species of Al and Cu in river waters using the diffusive gradients in thin... Paulo Sergio Tonello, Danielle Goveia, André Henrique Rosa, ... Published: 09 January 2011
Analytical and Bioanalytical Chemistry, doi: 10.1007/s00216-010-4603-x
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Article 2 Reads 8 Citations Use of Saccharomyces cerevisiae immobilized in agarose gel as a binding agent for diffusive gradients in thin films Amauri A. Menegário, Paulo S. Tonello, Steven F. Durrant Published: 01 December 2010
Analytica Chimica Acta, doi: 10.1016/j.aca.2010.10.016
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Article 6 Reads 3 Citations Determinação seletiva de tributilestanho na presença de Sn(IV) em amostras ambientais usando HG-ICP OES e Saccharomyces ... Monizze Vannuci E Silva, Amauri Antonio Menegário, Mariana F... Published: 01 January 2010
Química Nova, doi: 10.1590/s0100-40422010000700020
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Article 2 Reads 15 Citations On-line redox speciation analysis of antimony using l-proline immobilized on controlled pore glass and hydride generatio... Amauri A. Menegario, Patricia Smichowski, Paulo S. Tonello, ... Published: 01 September 2008
Analytica Chimica Acta, doi: 10.1016/j.aca.2008.07.029
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