Pt and ZnFe₂O₄ Nanoparticles Immobilized on Carbon for the Detection of Glutathione

Abstract

The catalytic activity of nanozymes has attracted much attention in biochemical analyses and the antibiosis and environmental fields. However, easy aggregation and difficulty in recycling greatly result in a decrease of their catalytic activity and further restrict their practical application. Herein, we immobilized Pt and ZnFe 2 O 4 nanoparticles on poplar-wood-derived carbon (ZnFe 2 O 4 /C), which exhibited excellent peroxidase-like activity and high affinity toward H 2 O 2 and 3,3′,5,5′-tetramethylbenzidine (TMB). Moreover, it could be easily separated by an external magnetic force from the reaction system. A sensitive and selective colorimetric sensor for glutathione (GSH) was established based on Pt/ZnFe 2 O 4 /C nanoperoxidase. The linear range for GSH was from 1 to 30 μM, and the limit of detection for GSH was calculated as 0.38 μM. The colorimetric method was applied to determine GSH in real samples for injection.

Construction of Co1‐xZnxFe2xGa2–2xO4 (0<x≤0.6) Solid Solutions for Improving Solar Fuels Production in Photocatalytic CO2 Reduction by H2O Vapour

“…Furthermore, compared with CoGa 2 O 4 , the peak position of O1s attributed to lattice oxygen in the Co 0.65 Zn 0.35 Ga 1.3 Fe 0.7 O 4 solid solution shifts toward lower binding energy (Figure 3f). The O1s peak of the solid solution corresponds to the lattice oxygen binding energy of 530.20 eV, which is higher than that of ZnFe 2 O 4 (530.09 eV), indicating the presence of new bonds [27–29] . In summary, the prepared Co 0.65 Zn 0.35 Ga 1.3 Fe 0.7 O 4 is a solid solution of cubic CoGa 2 O 4 and cubic ZnFe 2 O 4.…”

“…The O1s peak of the solid solution corresponds to the lattice oxygen binding energy of 530.20 eV, which is higher than that of ZnFe 2 O 4 (530.09 eV), indicating the presence of new bonds. [27][28][29] In summary, the prepared x Zn x Fe 2x Ga 2-2x O 4 (0 < x � 0.6) solid solution samples. In Figure 4a, all samples were evaluated for photocatalytic activity, and carbon dioxide photoreduction experiments were performed without the addition of cocatalyst, sacrificial agent, or photosensitizer.…”

Novel Thermal Decomposition Method for the Synthesis of Iron‐doped SnS2 Nanoparticles and Studies on their Peroxidase‐like Activity

“…Fe 0.027 Sn 0.973 S 2 shows ferromagnetic behaviour at 300 K. Srivind et al have reported weak ferromagnetic behaviour for iron doped SnS 2 nanopowders ([Fe] = 0 to 15%) at room temperature. [45] Many reports are available in literature on the peroxidaselike activity using magnetic nanoparticles such as Fe 3 O 4 , [67,68] Co 3 O 4 @BSA, [69] Pt and ZnFe 2 O 4 nanoparticles immobilized on carbon, [70] ABEI functionalized CuFe 2 O 4 , [71] and Fe nanoparticles [72] as the catalyst. The authors have demonstrated that these magnetic nanoparticles can be separated using an external magnet after the catalytic reaction.…”

Iron‐Doped NiCo2O4 Nanoparticles: Synthesis via Homogeneous Precipitation Method and Studies on their Peroxidase‐like Activity

“…Various magnetic spinel nanoparticles have been reported in literature for the peroxidase-like activity including Pt and ZnFe 2 O 4 nanoparticles immobilized on carbon, [82] ABEI functionalized CuFe 2 O 4 , [83] and Fe 3 O 4 nanoparticles. [84] In the current study, after the catalytic reaction, an external magnet was used for the separation of catalyst.…”