access icon free Determination of hydrogen peroxide using a biosensor based on Fe3O4 magnetic nanoparticles and horseradish peroxidase with graphene–chitosan composite

A novel hydrogen peroxide (H2O2) biosensor was constructed based on Fe3O4 magnetic nanoparticles (MNPs) and horseradish peroxidase with graphene–chitosan composite material as a matrix. Fe3O4 MNPs were synthesised by chemical co-precipitation with sodium citrate as surfactant. Fourier transform infrared spectroscopy and transmission electron microscopy were applied for the characterisation of the obtained Fe3O4 MNPs. The conductivity of different composite films was researched by electrochemical impedance spectroscopy and the electrocatalytic properties of the H2O2 biosensor were studied by cyclic voltammetry. Under optimal conditions, experimental results indicated that the biosensor could electrocatalyse the reduction of H2O2; the reduction peak current had a good linear relationship with the concentration of H2O2 from 2.49 × 10−5 to 1.67 × 10−3 mol/l (R = 0.9990). The detection limit was 3.05 × 10−6 mol/l (S/N = 3). This novel biosensor showed good sensitivity, stability and repeatability for H2O2 detection.

Inspec keywords: electrochemical impedance spectroscopy; nanofabrication; sensitivity; graphene; thin films; nanocomposites; voltammetry (chemical analysis); biochemistry; thin film sensors; nanoparticles; surfactants; nanosensors; molecular biophysics; magnetic particles; biosensors; biomagnetism; nanomagnetics; iron compounds; transmission electron microscopy; Fourier transform spectra; catalysis; precipitation (physical chemistry); infrared spectra; reduction (chemical); electrical conductivity

Other keywords: composite hlms; graphene-chitosan composite material; electrocatalytic properties; surfactant; Fe3O4 magnetic nanoparticles; electrochemical impedance spectroscopy; conductivity; hydrogen peroxide determination; H2O2 reduction; Fourier transform infrared spectroscopy; transmission electron microscopy; sensitivity; sodium citrate; chemical coprecipitation; horseradish peroxidase; cyclic voltammetry; biosensor; electrocatalyse; Fe3O4-C

Subjects: Micromechanical and nanomechanical devices and systems; Biosensors; Biomolecular interactions, charge transfer complexes; Electrochemical analytical methods; Electrochemistry and electrophoresis; Physical chemistry of biomolecular solutions and condensed states; Methods of nanofabrication and processing; Microsensors and nanosensors; Biosensors; Specific chemical reactions; reaction mechanisms; Biomagnetism; Sensing and detecting devices; Heterogeneous catalysis at surfaces and other surface reactions

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