Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/10239
Título: Host-guest complexes of phenoxy alkyl acid herbicides and cyclodextrins. MCPA and β-cyclodextrin
Autor: Garrido, E. Manuela
Santos, Marcos
Silva, Paulo
Cagide, Fernando
Garrido, J.M.P.J.
Borges, Fernanda
Palavras-chave: Phenoxyacetic acid herbicides
MCPA
β-cyclodextrin
Inclusion complex
Data: 2012
Editora: Taylor & Francis
Relatório da Série N.º: Journal of Environmental Science and Health, Part B;Volume 47, Issue 9
Resumo: The chlorophenoxy herbicideMCPA(4-chloro-2-methylphenoxyacetic acid), widely used for the control of broad-leafweeds primarily in cereal and grass seed crops, still remains one of the most often used herbicides in Portugal. As the formation of inclusion complexes with cyclodextrins can improve its solubility properties, the interaction between the herbicide MCPA and β-cyclodextrin was investigated. The stability constants describing the extent of formation of the complexes have been determined by phase-solubility studies. Different analytical techniques [ultraviolet-visible spectroscopy (UV-Vis), differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance spectroscopy (1H NMR)] were employed for a thorough investigation of the structural characteristics of the obtained complexes, which exhibited distinct features and properties from both “guest” and “host” molecules. FTIR and 1H NMR data obtained for the MCPA/β-CD complexes gave information about the interaction between MCPA and the nonpolar cyclodextrin cavity. The dramatic change observed in band frequency and proton displacements of OCH2 group and H6 aromatic proton confirmed the inclusion of MCPA in β-CD. The formation of an inclusion complex between MCPA and β-CD increased the aqueous solubility of this herbicide which could be a particularly advantageous property for some specific applications, namely to improve commercial formulation and for environmental protection.
URI: http://hdl.handle.net/10400.22/10239
DOI: http://dx.doi.org/10.1080/03601234.2012.693867
Versão do Editor: http://www.tandfonline.com/doi/abs/10.1080/03601234.2012.693867
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