Macroscopically Oriented Magnetic Core‐regularized Nanomaterials for Glucose Biosensors Assisted by Self‐sacrificial Label

Abstract

Magnetic core-regular nanostructures composed of magnetite and regular Prussian blue was prepared by self-sacrificial macro-oriented method. Magnetic graphene oxide (MGO) was vertically oriented on the surface of home-made screen-printing electrode with the help of constant magnetic field (CMF).Then regular nanostructured Prussian blue (RPB) was realized by chemical reaction through an aerosol deposition. Finally, glucose oxidase (GOx) was immobilized by glutaraldehyde cross-linking to fabricate glucose biosensors. The linear range of CMF-RPB/MGO sensor towards glucose was 0.03~1.35 mM, and the detection limit was 13.4 μM. The CMF-RPB/MGO sensor could apply to analyze glucose in human serum samples.

Three-dimensional gold nanowires with high specific surface area for simultaneous detection of heavy metal ions

“…5a shows the CV curves of the gold nanowire electrode at different scan rates in the [Fe(CN) 6 ] 3−/4− system. From the Randles–Sevcik formula (eqn (1)), 35,36 the effective surface area of the electrode can be obtained: i p = 2.69 × 10 5 n 3/2 A 0 D 1/2 0 v 1/2 c 0 where A is the electrode effective area (cm 2 ), D 0 is the diffusion coefficient of the reactant (cm 2 s −1 , D 0 = 1 × 10 −5 cm 2 s −1 ), n is the number of electrons transferred in the redox process, v is the scan rate (V s −1 ), c 0 is the concentration of the redox substance (mol cm −3 ), and i p is the current maximum ( A ).…”

Bismuth sulfide micro flowers decorated nickel foam as a promising electrochemical sensor for quantitative analysis of melamine in bottled milk samples

“…The effective surface area (A e ) was determined using the following scientific variables: the concentration of the electrolyte probe (c), the scan rate of the cyclic voltammetry (CV) analysis (v), the diffusion constant (D) with a value of 7.6 × 10 -6 cm 2 S −1 , and the number of electrons involved in the redox reaction (n). The calculated effective surface area was found to be 0.0461 cm 2 , which exhibited an increase of ∼96.4% compared to the bare NF [27,28]. This enhancement in the EASA of the modified electrode can be attributed to the abundance of electrocatalytic active sites present in the Bi 2 S 3 /NF microflowers, as well as the presence of oxyfunctional groups on their surface.…”

Colorimetric assay based on NiCo2S4@N,S-rGO nanozyme for sensitive detection of H2O2 and glucose in serum and urine samples

“…At present, a variety of approaches for the detection of glucose and H 2 O 2 have been established, such as enzymatic methods, 5 glucose meters, 6 electrochemical non-enzymatic methods, [7][8][9][10][11] high performance liquid chromatography (HPLC), 12 capillary zone electrophoresis, 13 Fourier transform infrared spectroscopy (FT-IR), 14 etc. The aforementioned methods have many kinds of drawbacks, such as difficult storage of natural enzymes, complex pretreatment procedures prior to chromatographic, spectrometric, and electrochemical detection, low sensitivity of glucose meter, etc.…”