Diagram and application of the portable visual and electrochemical H2O2 sensors. a–c Schematic illustration and corresponding calibration curve of portable visual H2O2 sensing based on testing paper. d–f Schematic illustration and corresponding calibration curve of portable electrochemical H2O2 sensing. g, h Measurement of H2O2 released from HeLa cells with portable visual and electrochemical sensors. Scale bar = 1.0 cm. i Comparison of H2O2 concentrations measured with the portable colorimetric sensor, the UV‒vis spectrophotometer, the portable electrochemical sensor, and the electrochemical workstation, respectively.
Newswise — In a groundbreaking study( https://doi.org/10.1038/s41378-023-00623-y) published on 29 November 2023, in the journal Microsystems & Nanoengineering, researchers from Northwestern Polytechnical University (NPU) have unveiled a breakthrough in the detection of hydrogen peroxide H2O2, a vital biomarker in biological processes, with the development of dual-functional portable sensors based on Pt-Ni hydrogels. These sensors, adept at both colorimetric and electrochemical detection, are poised to revolutionize personalized healthcare.
The innovative Pt-Ni hydrogels, synthesized through a simple co-reduction process, are integral to a new method for H2O2 detection. These hydrogels, with their unique structure of nanowire networks and crumpled nanosheets, provide a vast surface area crucial for biosensing. Demonstrating significant peroxidase-like and electrocatalytic activities, they enable both colorimetric and electrochemical sensing of H2O2. The colorimetric approach involves a visible color change in the hydrogel upon interaction with H2O2, measurable via UV-visible absorption spectra, with a rapid response time. Electrochemical sensing is confirmed through cyclic voltammetry, highlighting the hydrogels' effectiveness in H2O2 reduction. Key findings include a low detection limit for both colorimetric (0.030 μM) and electrochemical (0.15 μM) methods, wide linearity ranges, outstanding long-term stability of up to 60 days, and excellent selectivity, essential for accurate H2O2 measurement in complex samples. Additionally, the sensors' performance in detecting H2O2 from HeLa cells aligns closely with standard spectrophotometric and electrochemical methods, confirming their potential for practical applications.
These portable H2O2 sensors represent a significant advancement in the field of health monitoring. Their simplicity, sensitivity, and selectivity make them ideal for point-of-care diagnostics, offering a new avenue for personalized healthcare. These devices, with their potential for easy integration into daily life, could revolutionize the way we monitor and manage health conditions, paving the way for broader applications in medical diagnostics and therapeutic monitoring.
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References
DOI
Original Source URL
https://doi.org/10.1038/s41378-023-00623-y
Funding information
The National Natural Science Foundation of China (22374119, 22274127, 61901389); The Research Fund of the State Key Laboratory of Solidification Processing (NPU), China (2021-QZ-01); The Key Project of the Natural Science Fund of Shaanxi Province (2023-JC-ZD-06).
About Microsystems & Nanoengineering
Microsystems & Nanoengineering is an online-only, open access international journal devoted to publishing original research results and reviews on all aspects of Micro and Nano Electro Mechanical Systems from fundamental to applied research. The journal is published by Springer Nature in partnership with the Aerospace Information Research Institute, Chinese Academy of Sciences, supported by the State Key Laboratory of Transducer Technology.
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