Determination of Carbaryl and Carbofuran in fruits and tap water by beta-cyclodextrin enhanced fluorimetric method

NATALIA L. PACIONI; ALICIA V. VEGLIA

Elsevier B. V.

Lugar: Amsterdam; Año: 2003 vol. 488 p. 193 - 193

he effect of -cyclodextrin (CD) and hydroxypropyl--cyclodextrin (HPCD) in water solutions on the UV-Vis and fluorescence spectra of carbaryl (1-naphthyl-N-methylcarbamate, CY) and carbofuran (2,2-dimethyl,2-3-dihydro-7-benzofuranyl- N-methylcarbamate, CF) was investigated. Host?guest interactions were observed by UV-Vis and spectrofluorimetry and the association constants for the 1:1 complexes (KA, mol−1 dm3) with CD and HPCD were determined. The values obtained were 190 ± 10 and 123 ± 7mol−1 dm3 for CF and 350 ± 50 and 644 ± 53 mol−1 dm3 for CY, respectively. The values of the fluorescence quantum yield ratios (φcomplexed/φfree) were 1.24 ± 0.01 with CD and 1.310 ± 0.007 with HPCD for CY, but much higher for CF being 7.0 ± 0.1 with CD and 9.3 ± 0.4 with HPCD. The limits of detection (LOD) for the fluorimetric determination under the better conditions were 14.5 ng cm−3 for the complex CF:CD and 1.94 ng cm−3 for the complex CY:CD in water, with