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Modified Fractal Iron Oxide Magnetic Nanostructure: A Novel and High Performance Platform for Redox Protein Immobilization, Direct Electrochemistry and Bioelectrocatalysis Application Publisher Pubmed



Bagheri H1 ; Ranjbari E2 ; Amiriaref M2 ; Hajian A3 ; Ardakani YH2 ; Amidi S4
Authors
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Authors Affiliations
  1. 1. Chemical Injuries Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
  2. 2. Biopharmaceutics and Pharmacokinetics Division, Department of Pharmaceutics, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, 14155-6451, Iran
  3. 3. Laboratory for Sensors, Department of Microsystems Engineering (IMTEK), University of Freiburg, Georges Kohler Allee 103, Freiburg, 79110, Germany
  4. 4. Department of Medicinal Chemistry, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran

Source: Biosensors and Bioelectronics Published:2016


Abstract

A novel biosensing platform based on fractal-pattern of iron oxides magnetic nanostructures (FIOMNs) and mixed hemi/ad-micelle of sodium dodecyl sulfate (SDS) was designed for the magnetic immobilization of hemoglobin (Hb) at a screen printed carbon electrode (SPCE). The FIOMNs was successfully synthesized through hydrothermal approach and characterized by atomic force microscopy (AFM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). In order to provide guidelines for the mixed hemi/ad-micelle formation, zeta-potential isotherms were investigated. The construction steps of the biosensor were evaluated by electrochemical impedance spectroscopy, cyclic voltammetry and Fourier transform infrared spectroscopy. Direct electron transfer of Hb incorporated into the biocomposite film was realized with a pair of quasi-reversible redox peak at the formal potential of -0.355 V vs. Ag/AgCl attributing to heme Fe(III)/Fe(II) redox couple. The results suggested that synergistic functions regarding to the hyper-branched and multidirectional structure of FIOMNs and the dual interaction ability of mixed hemi/ad-micelle array of SDS molecules not only induce an effective electron transfer between the Hb and the underlying electrode (high heterogeneous electron transfer rate constant of 2.08 s-1) but also provide powerful and special microenvironment for the adsorption of the redox proteins. Furthermore, the biosensor displayed an excellent performance to the electrocatalytic reduction of H2O2 with a detection limit of 0.48 μM and Michaelis-Menten constant (Km) value of 44.2 μM. The fabricated biosensor represented the features of sensitivity, disposable design, low sample volume, rapid and simple preparation step, and acceptable anti-interferences, which offer great perspectives for the screen-determination of H2O2 in real samples. © 2016 Elsevier B.V.