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Type: Artigo de periódico
Title: Characterisation And Properties Of The Inclusion Complex Of 24-epibrassinolide With β-cyclodextrin
Author: De Azevedo M.B.M.
Zullo M.A.T.
Alderete J.B.
De Azevedo M.M.M.
Salva T.J.G.
Duran N.
Abstract: This paper reports the first study of an inclusion complex of a brassinosteroid with β-cyclodextrin. The formation of inclusion complexes between 24-epibrassinolide and β-cyclodextrin was confirmed by their physicochemical properties and the compounds were analysed by differential scanning calorimetry, powder X-ray diffraction, nuclear magnetic resonance spectrometry and scanning electron microscopy. Theoretical calculations using the MM+ HyperChem force field showed a preference for inclusion of the side chain of the epibrassinolide molecule into the β-cyclodextrin cavity to form a 1:1 inclusion complex, although complexes involving inclusion of the steroidal nucleus also possess a favourable interaction energy. Rice lamina inclination assay, employing IAC-103 and IAC-104 cultivars, showed an improved activity for the epibrassinolide-cyclodextrin complex compared to the epibrassinolide itself. The results suggest that brassinosteroid complexation with cyclodextrins may enhance the biological activity of these plant growth regulators.
Rights: fechado
Identifier DOI: 10.1023/A:1020842727497
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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