Citation: Xianghua Zeng, Weichen Meng, Xiaochun Han, Jiachen Yang, Kaiqi Wu, Fengxian Gao, Xiliang Luo. Highly stable and antifouling solid-contact ion-selective electrode for K⁺ detection in complex system based on multifunctional peptide and conductive MOF[J]. Chinese Chemical Letters, ;2025, 36(8): 110564. doi: 10.1016/j.cclet.2024.110564 shu

Highly stable and antifouling solid-contact ion-selective electrode for K⁺ detection in complex system based on multifunctional peptide and conductive MOF

Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, Shandong Key Laboratory of Biochemical Analysis, College of Chemistry and Molecular Engineering, Qingdao University of Science & Technology, Qingdao 266042, China

fengxian@mail.ustc.edu.cn

xiliangluo@qust.edu.cn

Received Date: 3 June 2024
Revised Date: 24 September 2024
Accepted Date: 17 October 2024
Available Online: 18 October 2024

Figures(6)

An all-solid-state ion-selective electrode (ISE) for the detection of potassium ions in complex media was developed based on functional peptides with both antibacterial and antifouling properties. While exhibiting unique antifouling property, the ISE capitalized on the high surface area of the conductive metal-organic framework (MOF) solid transducer layer to facilitate rapid ion-electron transfer, consequently improving the electrode stability. For a short period, the application of a ± 1 nA current to the ISE resulted in a slight potential drift of 2.5 µV/s, while for a long-term stability test, the ISE maintained a stable Nernstian response slope over 8 days. The antifouling and antibacterial peptide effectively eradicated bacteria from the electrode surface while inhibited the adhesion of bacteria and other biological organisms. Both theoretical calculations and experimental results indicated that the incorporation of peptides in the sensing membrane did not compromise the detection performance of the ISE. The prepared antifouling potassium ion-selective electrode exhibited a Nernstian response range spanning from 1.0 × 10^–⁸ mol/L to 1.0 × 10^–³ mol/L, with a detection limit of 2.51 nmol/L. Crucially, the prepared solid-contact ISE maintained excellent antifouling and sensing capabilities in actual seawater and human urine, indicating a promising feasibility of this strategy for constructing ISEs suitable for practical application in complex systems.
- Multifunctional peptide,
- Conductive MOF,
- Ion-selective electrode,
- Antifouling,
- Potassium ion
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Highly stable and antifouling solid-contact ion-selective electrode for K+ detection in complex system based on multifunctional peptide and conductive MOF

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通讯作者: 陈斌, bchen63@163.com

Highly stable and antifouling solid-contact ion-selective electrode for K⁺ detection in complex system based on multifunctional peptide and conductive MOF