Journal
ANALYST
Volume 135, Issue 5, Pages 1015-1022Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b925533h
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Funding
- CNPq [472169/2004-1, 472541/2006-4]
- MCT/CNPq/PADCT
- CAPES
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Gold nanoparticles dispersed in an ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate (Au-BMI.PF(6)) and a binuclear nickel(II) complex ([Ni(2)(HBPPAMFF)mu-(OAc)(2)(H(2)O)]BPh(4)) immobilized on functionalized silica were successfully applied in the construction of a novel sensor for the determination of fisetin by square-wave voltammetry. Under optimized conditions, the analytical curve showed two linear ranges for fisetin concentrations from 0.28 to 1.39 mM and 2.77 to 19.50 mM with a detection limit of 0.05 mM. This sensor demonstrated suitable stability (ca. 150 days; at least 500 determinations) and good repeatability and reproducibility, with relative standard deviations of 2.91 and 5.11%, respectively. The recovery study of fisetin in apple juice samples gave values from 96.4 to 106.4%. The efficient analytical performance of the proposed sensor can be attributed to the effective immobilization of the Ni(II)Ni(II) complex on silica and the Au-BMI.PF(6) contribution to the electrode response.
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