A general thiol assay based on the suppression of fluorescence resonance energy transfer in magnetic-resin core-shell nanospheres coated with gold nanoparticles
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- 作者：Vanessa Román-Pizarro ; Umair Gulzar ; Juan Manuel Fernández-Romero…
- 关键词：Fluorescence surfactant enhancement ; Magnetic ; phenol/formaldehyde resin ; Gold nanospheres ; Fluorescence resonance energy transfer ; Thiols ; Water samples
- 刊名：Microchimica Acta
- 出版年：2015
- 出版时间：October 2015
- 年：2015
- 卷：182
- 期：13-14
- 页码：2285-2292
- 全文大小：1,161 KB
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Umair Gulzar (1)
Juan Manuel Fernández-Romero (1)
Agustina Gómez-Hens (1)
1. Department of Analytical Chemistry, Institute of Fine Chemistry and Nanochemistry (IUQFN-UCO) Campus of Rabanales, Marie Curie Building (Annex) University of Córdoba, E-14071, Córdoba, Spain - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Analytical Chemistry
Inorganic Chemistry
Physical Chemistry
Characterization and Evaluation Materials
Monitoring, Environmental Analysis and Environmental Ecotoxicology - 出版者：Springer Wien
- ISSN：1436-5073
文摘
A simple, rapid and sensitive fluorescence resonance energy transfer (FRET) method is presented for the determination of thiols. It is based on the thiol-induced enhancement effect of the surfactant sodium dodecyl sulfate (SDS) on the efficiency of fluorescence resonance energy transfer (FRET) in nanospheres consisting of a magnetic (Fe3O4) core and a phenol-formaldehyde resin (PFR) shell containing gold nanoparticles (AuNPs). The luminescence of the core-shell nanospheres at excitation/emission wavelengths of 390/445 nm, respectively, is quenched by the AuNPs which act as energy acceptors. The interaction of AuNPs with thiol compounds in the presence of SDS suppresses FRET and gives rise to a fluorescent signal whose intensity is proportional to the thiol concentration. The analytical features of seven thiols (homocysteine, thioglycolic acid, glutathione, dodecanethiol, cysteamine, cysteine and N-acetylcysteine) were studied. Detection limits are in the range from 0.14 to 0.49 μmol L?. The precision of the method, expressed as the relative standard deviation, ranges from 0.4 to 4.9 %. The method was applied to the determination of total thiols in water samples with recovery values between 88.7 and 104.6 %.