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测量应用案例-20220309
阅读：116 发布时间：2022-3-24
文献名：
Nanomaterial LaNiTiO3-Fe3O4-based Peroxidase Biomimetic Sensor with High Sensitivity
作者
：
Xu, Yanhong
;
Sun, Ying
;
Feng, Qiao
Department of Materials Engineering, Xuzhou College of Industrial Technology, Xuzhou, Jiangsu Province,China
r
摘要：
Background: Hydrogen peroxide (H
2
O
2
) is widely used in various fields and it plays a quintessential role in a variety of biomolecular processes. H2O2 concentration level is an essential biological parameter in monitoring and maintaining the physiological balance of a living cell, and its variation causes some related diseases. Therefore, it is extremely significant to fabricate biosensor with low cost, which can quickly, accurately and sensitively detect H
2
O
2
in a wide range. The aims of this paper are to explore a novel electrochemical sensor with high intrinsic peroxidase-like activity, high sensitivity and stability to effectively detect H
2
O
2
concentration in real samples.
Methods: The chemically modified electrode LaNiTiO
3
-Fe
3
O
4
/GCE was fabricated based on the nanomaterial LaNiTiO
3
-Fe
3
O
4
by a simple process, and its electrochemical properties were investigated in the supporting electrolyte of 0.1 M NaOH by the techniques of cyclic voltammetry and currenttime curves on an electrochemical workstation with a conventional three-electrode system.
Results: LaNiTiO
3
-Fe
3
O
4
nanoparticles show good peroxidase-like activity for H2O2 at a low applied potential of +0.50 V. Under the optimum conditions, the peroxidase biomimetic sensor LaNiTiO
3
-Fe
3
O
4
/GCE exhibited a wide linear response for H
2
O
2
oxidation in the range of 0.05 μM - 3.0 mM (R = 0.9994) with a high sensitivity of 3946.2 μA·mM-1·cm-2 and fast response time of 2 s; besides, the detection limit of H
2
O
2
was found to be ca. 5.15 nM (S/N = 3). Moreover, the biosensor exhibited good repeatability, stability and anti-interference. Satisfactory results were obtained when the sensor LaNiTiO
3
-Fe
3
O
4
/GCE was applied to determine H
2
O
2
in real samples. All of these results provide support to practical application.
Conclusion: A highly sensitive peroxidase biomimetic sensor based on LaNiTiO
3
-Fe
3
O
4
with nanoscaled material has been successfully explored, and shows good activity for H
2
O
2
. The proposed biosensor with simple and low cost exhibited excellent advantages of quick response, wide linear range, low detection limit, high sensitivity, long-term stability and good anti-interference ability, which offer promising applications.
关键词：
Amperometric biosensor
;
biomimetic sensor
;
nanoparticles
;
perovskite
;
peroxidase-like
;
spinel