Magnetic coupled electrochemistry: Exploring the use of superparamagnetic nanoparticles for capturing, transporting and concentrating trace amounts of analytes

Condomitti, Ulisses; Zuin, Andre; Novak, Miguel A.; Araki, Koji; Toma, Henrique E.

doi:10.1016/j.elecom.2010.11.016

Cited by 17 publications

(8 citation statements)

References 27 publications

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“…Superparamagnetic nanoparticles are now opening very interesting applications in chemistry and biotechnology [15][16][17][18][19][20]. Such nanoparticles, because of their very small sizes, exhibit single magnetic domains [21] and undergo very strong magnetization in the presence of magnetic fields, in contrast to the conventional micro and macroscopic particles where the net magnetization is strongly reduced by the random interactions from the multiple magnetic domains.…”

Section: Introductionmentioning

confidence: 97%

“…Commercially available nanoparticles have already been employed for capturing mercury ions from aqueous solution [22]. Recently, we have shown that under the attraction from an external magnetic field, the captured analytes can be transported and concentrated at the electrode surface, thus allowing their direct electrochemical monitoring using conventional techniques, such as cyclic voltammetry and amperometry [15].…”

Section: Introductionmentioning

confidence: 99%

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Superparamagnetic Carbon Electrodes: A Versatile Approach for Performing Magnetic Coupled Electrochemical Analysis of Mercury Ions

Condomitti¹,

Zuin²,

Silveira³

et al. 2011

Electroanalysis

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Mercury ions can be captured with superparamagnetic carbon powder substrates and transported to the electrode surface using an external miniature magnet. The magnetic carbon substrate is electronically conducting, and more than promoting efficient preconcentration of the element at the electrode, it increases the electrochemical surface area by forming an extended 3D structure in the presence of a magnetic field. The external magnet allows to perform direct electrochemical analysis, leading to a strong enhancement of the analytical signals for the reduction of the Hg(II) ions.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Superparamagnetic Carbon Electrodes: A Versatile Approach for Performing Magnetic Coupled Electrochemical Analysis of Mercury Ions

Condomitti¹,

Zuin²,

Silveira³

et al. 2011

Electroanalysis

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“…Superparamagnetic nanoparticles are now opening interesting applications in analytical chemistry [22]. Such nanoparticles exhibit a single magnetic domain, a characteristic point associated with their nanometric dimensions [23].…”

Section: Introductionmentioning

confidence: 99%

Direct use of superparamagnetic nanoparticles as electrode modifiers for the analysis of mercury ions from aqueous solution and crude petroleum samples

Condomitti

Zuin

Silveira

et al. 2011

Journal of Electroanalytical Chemistry

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a b s t r a c tSuperparamagnetic nanoparticles previously modified with mercaptopropyltriethoxysilane were employed in this work as electrode modifiers, for direct use in the presence of an external miniature magnet, for the analysis of mercury ions from aqueous solutions, as well as from crude oil. After capturing the mercury ions, the nanoparticles were magnetically concentrated at the electrode surface. The nanoparticles coating exhibited a sharp electrochemical response, and the preconcentration effect led to a strong enhancement of the electrochemical signals. The in situ magnetic coupled electroanalysis was successfully demonstrated for mercury ions and confronted with parallel energy dispersive X-ray fluorescence measurements. Rather consistent results were observed for mercury ions either from aqueous solutions, as well as from the crude oil samples.

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“…Nanoparticles are being increasingly used as electrode modifiers, because they can expand the active area, introduce new functionalities, and improve the electron transfer processes . In particular, magnetite nanoparticles (MagNP) are being used in (bio) electrochemical sensors , because their magnetic properties allow a rapid and efficient modification procedure for the electrode surface, by applying an external magnet. In addition, they usually exhibit functional groups on their surface, such as hydroxyl groups, favoring the binding of molecules to their surface, and facilitating the electron transfer process at the electrode‐solution interface.…”

Section: Introductionmentioning

confidence: 99%

Magnetite Nanoparticles Bonded Carbon Quantum Dots Magnetically Confined onto Screen Printed Carbon Electrodes and their Performance as Electrochemical Sensor for NADH

et al. 2017

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Hybrid magnetite/carbon quantum dots (MagNP/C‐dots) were prepared and their characterization performed by high resolution transmission electron microscopy (HR‐TEM), X‐ray diffraction (XRD) and X‐ray photoelectron spectroscopy (XPS). Because of their suitable magnetization and electrochemical properties, they were used as versatile electrode modifiers after magnetically confining onto screen printed carbon electrodes (SPE), with the aid of a miniature external magnet. The reported strategy introduces a convenient procedure for assembling modified electrodes, since the nanoparticles can be easily released by removing the magnet. The non‐enzymatic magnetic biosensor showed excellent performance in the determination of NADH at the concentration range 2×10−7 to 5×10−6 mol L−1, exhibiting a sensitivity of 0.15 μmol L−1 and detection limit of 20 nmol L−1. The MagNP/C‐dots/SPE sensor was also successfully applied for the determination of NADH in serum samples. The interference of typical biological molecules has also been investigated.

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Magnetic coupled electrochemistry: Exploring the use of superparamagnetic nanoparticles for capturing, transporting and concentrating trace amounts of analytes

Cited by 17 publications

References 27 publications

Superparamagnetic Carbon Electrodes: A Versatile Approach for Performing Magnetic Coupled Electrochemical Analysis of Mercury Ions

Superparamagnetic Carbon Electrodes: A Versatile Approach for Performing Magnetic Coupled Electrochemical Analysis of Mercury Ions

Direct use of superparamagnetic nanoparticles as electrode modifiers for the analysis of mercury ions from aqueous solution and crude petroleum samples

Magnetite Nanoparticles Bonded Carbon Quantum Dots Magnetically Confined onto Screen Printed Carbon Electrodes and their Performance as Electrochemical Sensor for NADH

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