A label-free electrochemical immunosensor based on a gold-vertical graphene/TiO2 nanotube electrode for CA125 detection in oxidation/reduction dual channels
© 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Austria, part of Springer Nature..
A label-free immunosensor was constructed in oxidation and reduction dual channel mode for the trace detection of cancer antigen 125 (CA125) in serum. The gold-vertical graphene/titanium dioxide (Au-VG/TiO2) electrode was used as the signal-amplification platform, and cytosine and dopamine were used as probes in the oxidation and reduction channels, respectively. VG nanosheets were synthesized on a TiO2 nanotube array via chemical vapor deposition (CVD), and Au nanoparticles were deeply embedded on the surface and in the root of the VG nanosheets via electrodeposition. The CA125 antibody was then directly immobilized onto the electrode surface, benefitting from its natural affinity for Au nanoparticles. In the oxidation and reduction channels the CA125 antibody-Au-VG/TiO2 immune electrode had the same response concentration range (0.01-1000 mU∙mL-1) for the determination of the CA125 antigen. However, the oxidation channel had a higher sensitivity (14.82 μA•(log(mU•mL-1))-1 at a working potential of ~ 1.25 V vs. SCE), lower detection limit (0.0001 mU∙mL-1), higher stability, and lower performance deviation than the reduction channel. This immunosensor was successfully used for CA125 detection in human serum. The recoveries of spiked serum samples ranged from 99.8 ± 0.5 to 100 ± 0.4%. The study on the difference in the sensing performance between oxidation and reduction channels provides a preliminary experimental reference for exploring dual-channel synchronous detection immunosensors and verifying the accuracy of the assay based on dual-channel data, which will promote the development of reliable electrochemical immunosensor technology.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2022 |
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| Erschienen: |
2022 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:189 |
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| Enthalten in: |
Mikrochimica acta - 189(2022), 7 vom: 14. Juni, Seite 257 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Chen, Zehua [VerfasserIn] |
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| Links: |
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| Anmerkungen: |
Date Completed 16.06.2022 Date Revised 08.07.2022 published: Electronic Citation Status MEDLINE |
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| doi: |
10.1007/s00604-022-05332-3 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM342230328 |
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| 245 | 1 | 2 | |a A label-free electrochemical immunosensor based on a gold-vertical graphene/TiO2 nanotube electrode for CA125 detection in oxidation/reduction dual channels |
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| 500 | |a Citation Status MEDLINE | ||
| 520 | |a © 2022. The Author(s), under exclusive licence to Springer-Verlag GmbH Austria, part of Springer Nature. | ||
| 520 | |a A label-free immunosensor was constructed in oxidation and reduction dual channel mode for the trace detection of cancer antigen 125 (CA125) in serum. The gold-vertical graphene/titanium dioxide (Au-VG/TiO2) electrode was used as the signal-amplification platform, and cytosine and dopamine were used as probes in the oxidation and reduction channels, respectively. VG nanosheets were synthesized on a TiO2 nanotube array via chemical vapor deposition (CVD), and Au nanoparticles were deeply embedded on the surface and in the root of the VG nanosheets via electrodeposition. The CA125 antibody was then directly immobilized onto the electrode surface, benefitting from its natural affinity for Au nanoparticles. In the oxidation and reduction channels the CA125 antibody-Au-VG/TiO2 immune electrode had the same response concentration range (0.01-1000 mU∙mL-1) for the determination of the CA125 antigen. However, the oxidation channel had a higher sensitivity (14.82 μA•(log(mU•mL-1))-1 at a working potential of ~ 1.25 V vs. SCE), lower detection limit (0.0001 mU∙mL-1), higher stability, and lower performance deviation than the reduction channel. This immunosensor was successfully used for CA125 detection in human serum. The recoveries of spiked serum samples ranged from 99.8 ± 0.5 to 100 ± 0.4%. The study on the difference in the sensing performance between oxidation and reduction channels provides a preliminary experimental reference for exploring dual-channel synchronous detection immunosensors and verifying the accuracy of the assay based on dual-channel data, which will promote the development of reliable electrochemical immunosensor technology | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Research Support, Non-U.S. Gov't | |
| 650 | 4 | |a Au–vertical graphene/TiO2 nanotubes array | |
| 650 | 4 | |a CA125 | |
| 650 | 4 | |a Electrochemical immunosensor | |
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| 700 | 1 | |a Li, Bingbing |e verfasserin |4 aut | |
| 700 | 1 | |a Liu, Jinbiao |e verfasserin |4 aut | |
| 700 | 1 | |a Li, Hongji |e verfasserin |4 aut | |
| 700 | 1 | |a Li, Cuiping |e verfasserin |4 aut | |
| 700 | 1 | |a Xuan, Xiuwei |e verfasserin |4 aut | |
| 700 | 1 | |a Li, Mingji |e verfasserin |4 aut | |
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