Intriguing peroxidase-mimic for H2O2 and glucose sensing: A synergistic Ce2(MoO4)3/rGO nanocomposites

Direct Growth of Poly-Glutamic Acid Film on Peroxidase Mimicking PCN-222(Mn) for Constructing a Novel Sensitive Nonenzymatic Electrochemical Hydrogen Peroxide Biosensor

“…Compared with Cu-MOF/GCE, the PGA/PCN-222­(Mn) composite film-modified GCE had distinct advantages over ultralow LOD and exceptional stability, which is suitable to analyze H 2 O 2 at low concentrations with a longer cycle life. In addition, an obvious wider linear range can be seen when PGA/PCN-222­(Mn)/GCE was compared with HRP-based sensor. − As tabulated in Table , ,,− the results indicate that the PGA/PCN-222­(Mn)/GCE is comparable with other H 2 O 2 sensors. It is conjectured that the excellent performance results from the following reasons: (1) the stable construction of 3D pore channels in PCN-222­(Mn) can effectively minimize the diffusion resistance, which exhibits faster diffusion rate of H 2 O 2 molecules to the metalloporphyrin skeleton.…”

“…As the most common representative of ROS, hydrogen peroxide (H 2 O 2 ) was associated with some bodily diseases including atherosclerosis, aging, cancer, and others . Currently, various analytical approaches have been developed for the quantitative determination of H 2 O 2 from complicated biological samples, such as fluorescence, colorimetry, , chemiluminescence, and electrochemistry. , However, the majority of these methods suffer from their technical downsides. For example, the fluorescence-based approach is time-consuming and costly; colorimetric assays usually suffers the disadvantages of low sensitivity and high detection limit (LOD) .…”

Porphyrin-Modified NiS2 Nanoparticles Anchored on Graphene for the Specific Determination of Cholesterol

“…And the two peaks at 861.3 and 880.0 eV were attributed to the two spin–orbit doublets of Ni with two shake-up satellites based on the Gaussian fitting method. , In Figure c, the peaks at 161.3 and 162.5 eV could be attributed to S 2p 3/2 and S 2p 1/2 , respectively. Furthermore, the peak at 168.47 eV was attributed to the sulfate/sulfite species, owing to the oxidation of S 2– in air. , Figure d shows that the peak centered at a binding energy of 283.92 eV was attributed to a prominent CC peak, and the two minor peaks at 285.01 and 287.5 eV were assigned to CN and CO, respectively. , As shown in Figure e, the peaks at 398.5 and 400.1 eV corresponded to the −NH– and −N bonds of the porphyrin ring, suggesting that porphyrin molecules coexist in the Por-NiS 2 /GO nanocomposites . As presented in Figure f, two characteristic peaks at 530.97 and 532.22 eV corresponded to O 1s spin–orbit core levels .…”

“…Therefore, to promote the dispersion of nanoparticles, it was essential to introduce a favorable carrier. As a two-dimensional (2D) carbon-based nanomaterial, graphene nanosheet was an ideal solid carrier with a high specific surface area, good electrical conductivity, strong mechanical strength, and high stability. − According to the previous reports, some graphene-based nanocomposites were demonstrated to possess a peroxidase-like activity, including AgNPs-rGO and Ni­(OH) 2 -rGO-Cu 2 O. , …”

Colorimetric sensing of chlorpyrifos through negative feedback inhibition of the catalytic activity of silver phosphate oxygenase nanozymes

“…23 Singh et al also studied cerium molybdate-incorporated graphene oxide nanocomposites for glucose sensing. 24 Researchers also found both peroxidase and oxidase-like activities for AuPt alloy NPs using TMB as a chromogenic material. 25 Rope-like Co-Fe layered hydroxide nanosheets based on hierarchical structures were studied for intrinsic oxidasecatalytic activity.…”