Prolonged surface peroxidase-like activity of Fe3O4 nanoparticles/few-layered graphene composite: Elucidation using UV–Vis and ESR spectroscopy
Nanoengineered catalysts mimic natural enzymatic reactions such as peroxidase activity, which is helpful in biosensing, environmental remediation, etc. In this regard, peroxidase-like Fe3O4 nanoparticles/few-layered graphene (FLG) composite is shown to be an excellent material for simultaneous and h...
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| Published in | Microchemical journal Vol. 217; p. 114810 |
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| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier B.V
01.10.2025
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| Subjects | |
| Online Access | Get full text |
| ISSN | 0026-265X |
| DOI | 10.1016/j.microc.2025.114810 |
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| Abstract | Nanoengineered catalysts mimic natural enzymatic reactions such as peroxidase activity, which is helpful in biosensing, environmental remediation, etc. In this regard, peroxidase-like Fe3O4 nanoparticles/few-layered graphene (FLG) composite is shown to be an excellent material for simultaneous and high-precision sensing of dopamine, ascorbic acid, and uric acid. However, it is observed that the peroxidase-like activity of Fe3O4 nanoparticles/FLG composite is surprisingly prolonged and a subject of immense interest because catalytic systems with stable and prolonged activity are crucial for performance and cost-effectiveness in biosensing, environmental remediation, energy production, and biomedicine. This work elucidates the prolonged surface peroxidase-like activity of Fe3O4 nanoparticles/FLG composite using UV–Vis and ESR spectroscopic analysis. The peroxidase-like activity of Fe3O4/FLG composite is recorded by using 3,3,5,5-tetramethylbenzidine and o-phenylenediamine as peroxidase substrates in the presence of H2O2 and its mechanism is explained based on the experimental observations.
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•Prolonged peroxidase-like activity of Fe3O4/few-layered graphene (FLG) composite.•Elucidation of prolonged peroxidase-like activity using UV–Vis and ESR spectroscopy.•Prolonged activity is due to Fe3+/Fe2+ ions as confirmed by ESR analysis.•FLG contributes to faster relaxation of spin states. |
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| AbstractList | Nanoengineered catalysts mimic natural enzymatic reactions such as peroxidase activity, which is helpful in biosensing, environmental remediation, etc. In this regard, peroxidase-like Fe3O4 nanoparticles/few-layered graphene (FLG) composite is shown to be an excellent material for simultaneous and high-precision sensing of dopamine, ascorbic acid, and uric acid. However, it is observed that the peroxidase-like activity of Fe3O4 nanoparticles/FLG composite is surprisingly prolonged and a subject of immense interest because catalytic systems with stable and prolonged activity are crucial for performance and cost-effectiveness in biosensing, environmental remediation, energy production, and biomedicine. This work elucidates the prolonged surface peroxidase-like activity of Fe3O4 nanoparticles/FLG composite using UV–Vis and ESR spectroscopic analysis. The peroxidase-like activity of Fe3O4/FLG composite is recorded by using 3,3,5,5-tetramethylbenzidine and o-phenylenediamine as peroxidase substrates in the presence of H2O2 and its mechanism is explained based on the experimental observations.
[Display omitted]
•Prolonged peroxidase-like activity of Fe3O4/few-layered graphene (FLG) composite.•Elucidation of prolonged peroxidase-like activity using UV–Vis and ESR spectroscopy.•Prolonged activity is due to Fe3+/Fe2+ ions as confirmed by ESR analysis.•FLG contributes to faster relaxation of spin states. |
| ArticleNumber | 114810 |
| Author | Patthi, Ranjith Reddy Geo, Sarah Satya Siva Srikanth Vadali, Venkata Vilasrao, Rewatkar Vrushali Battula, Lakshmi |
| Author_xml | – sequence: 1 givenname: Ranjith Reddy surname: Patthi fullname: Patthi, Ranjith Reddy – sequence: 2 givenname: Rewatkar Vrushali surname: Vilasrao fullname: Vilasrao, Rewatkar Vrushali – sequence: 3 givenname: Lakshmi surname: Battula fullname: Battula, Lakshmi – sequence: 4 givenname: Sarah surname: Geo fullname: Geo, Sarah – sequence: 5 givenname: Venkata surname: Satya Siva Srikanth Vadali fullname: Satya Siva Srikanth Vadali, Venkata email: vvsssse@uohyd.ac.in |
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| Keywords | Fe3O4 ESR spectroscopy Peroxidase Catalysis Graphene UV–Vis spectroscopy |
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| Title | Prolonged surface peroxidase-like activity of Fe3O4 nanoparticles/few-layered graphene composite: Elucidation using UV–Vis and ESR spectroscopy |
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