Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/11132
Title: Formação e caracterização de complexos de inclusão entre atrazina e ciclodextrinas suportadas em sílica
Other Titles: Formation and characterization of inclusion complexes between atrazine and cyclodextrins anchored on silica.
Authors: Pinto, Luciana de Matos Alves
Andrade-Vieira, Larissa Fonseca
Freire, Juliana Mesquita
Fraceto, Leonardo Fernandes
Keywords: Atrazina
Ciclodextrinas
Plantas - Efeito dos herbícidas
Atrazine
Cyclodextrins
Plants - Effect of herbicides
Issue Date: 5-May-2016
Publisher: Universidade Federal de Lavras
Citation: VENCESLAU, A. de F. A. Formação e caracterização de complexos de inclusão entre atrazina e ciclodextrinas suportadas em sílica. 2016. 71 p. Dissertação (Mestrado em Agroquímica)-Universidade Federal de Lavras, Lavras, 2016.
Abstract: Atrazine (ATZ) is one of the most used agrochemicals around the world, since it is important in conservation tillage in order to increase productivity and decrease erosion. The main issues concerning the usage of ATZ are related to leaching and toxicity. Cyclodextrins (CD) and cyclodextrins functionalized in silica (CDSI) have been proving to be effective alternatives to avoid these issues, changing the liberation of the guest molecules and reducing toxicity. Inclusion complexes between ATZ and CD (ATZ/α-CD; ATZ/ɣ-CD) and CDSI (ATZ/α-CDSI; ATZ/ɣ-CDSI) have been prepared and characterization tests (infrared and differential scanning calorimetry) have been conducted. These tests indicated the inclusion of ATZ in the cavity. Phase solubility has shown that the stoichiometry is 1:1. Liberation tests have shown that all samples had a slower liberation in comparison with the uncomplexed ATZ. The ATZ/ɣ-CDSI reduced the liberation speed in 75%. In liberation tests conducted in soil columns, the samples had the same reactions due to possible interactions in the soil. Bioassays with Lactuca sativa have indicated that all samples were less toxic than uncomplexed ATZ. In the chromosome aberration test, there was reduction of 38,75% for ɣ-CD and 33,52% for ɣ-CDSI, compared to the uncomplexed ATZ. Thus, ATZ/ɣ-CD and ATZ/ɣ-CDSI have been proving to be more efficient and less toxic, probably due to the size of the internal cavity of ɣ-CD.
URI: http://repositorio.ufla.br/jspui/handle/1/11132
Appears in Collections:Agroquímica - Mestrado (Dissertações)



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