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Submitted by Jorge Fangueiro (jotacassino@hotmail.com) on 2013-09-20T20:32:57Z No. of bitstreams: 1 Sensor for fisetin based on gold nanoparticles in ionic liquid and binuclear.pdf: 224516 bytes, checksum: 2ad6ab42325c9d78a806b78298b2f23c (MD5)

Approved for entry into archive by Michele Fernanda(michele_fernandas@hotmail.com) on 2013-09-22T22:26:55Z (GMT) No. of bitstreams: 1 Sensor for fisetin based on gold nanoparticles in ionic liquid and binuclear.pdf: 224516 bytes, checksum: 2ad6ab42325c9d78a806b78298b2f23c (MD5)

Made available in DSpace on 2013-09-22T22:26:55Z (GMT). No. of bitstreams: 1 Sensor for fisetin based on gold nanoparticles in ionic liquid and binuclear.pdf: 224516 bytes, checksum: 2ad6ab42325c9d78a806b78298b2f23c (MD5) Previous issue date: 2010

Gold nanoparticles dispersed in an ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate (Au-BMI.PF6) and a binuclear nickel(II) complex ([Ni2(HBPPAMFF)μ-(OAc)2(H2O)]BPh4) 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 μM and 2.77 to 19.50 μM with a detection limit of 0.05 μM. 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 NiIINiII complex on silica and the Au-BMI.PF6 contribution to the electrode response.