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Complexation of herbicide bentazon with native and modified beta-cyclodextrin

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2010-10
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Yáñez Soto, Claudia
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Complexation of herbicide bentazon with native and modified beta-cyclodextrin
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Author
  • Yáñez Soto, Claudia;
  • Araya, M.;
  • Bollo Dragnic, Soledad;
Abstract
For first time the complexation of bentazon (Btz) with native b-cyclodextrin (b-CD) and modified sulfobutylether- b-CD (SBE-CD) was studied by differential pulse voltammetry. In addition, a spectrophotometry UV–Visible study was carried out. In presence of CDs there is a decrease of the anodic peak current with the increase of the amount of CD. This decrease is due to the lower diffusion coefficient of Btz/CD complex compared with the free guest. Using the variation in current, association constants of 118 ± 20 and 317 ± 25 M-1 for b-CD and SBE-CD were determined. The solubility of bentazon was 8 fold higher with SBE-CD as compared with bentazon-free. Phase solubility diagrams performed using UV–Vis experiments permit to obtain the same association constants which were compared with the values obtained by electrochemical techniques.
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This research was supported by Universidad de Chile, project ENL 08/09 and Fondecyt, grant 1090254.
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URI: https://repositorio.uchile.cl/handle/2250/121139
DOI: DOI: 10.1007/s10847-010-9750-3
ISSN: 0923-0750
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JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHEMISTRY Volume: 68 Issue: 1-2 Pages: 237-241 Published: OCT 2010
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