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<p>A novel, environmentally friendly, and antifouling all-solid-state calcium ion-selective electrode is developed for monitoring calcium ions in marine environments. The sensor employs a self-designed cyclic peptide as an antifouling material, with 3,4-dihydroxyphenylalanine at both ends, forming a stable cyclic structure that firmly adheres to the electrode surface. The abundant carbonyl and hydroxyl groups on the peptide chains of cyclic peptides provide high hydrogen bond donor/acceptor ability, allowing them to form a hydration layer that resists adsorption of proteins or microorganisms at the sensing interface. Compared to straight-chain peptides, cyclic peptides exhibit superior stability. Furthermore, electrodes modified with cyclic peptides exhibit significantly improved antifouling performances, effectively mitigating biofouling by extracellular polymeric substances and microorganisms, such as <i>Escherichia coli</i> and <i>Staphylococcus aureus</i>. More importantly, the sensor can maintain good long-term stability over a period of 50&#xa0;days. The strategy of incorporating antifouling cyclic peptides into marine sensors is expected to construct marine sensing devices with robust performance in the ocean.</p>

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All-Solid-State Calcium Ion-Selective Electrodes Modified with Antifouling Cyclic Peptides for Long-Term Monitoring in the Ocean

  • 期刊论文

  • 发表日期：

    2026年2月13日

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  • Weichen Meng,
  • Wenjing Tai,
  • Enbao Lu,
  • Meng Zhang,
  • Jizhou Duan,
  • Xianghua Zeng,
  • Xiliang Luo

摘要

A novel, environmentally friendly, and antifouling all-solid-state calcium ion-selective electrode is developed for monitoring calcium ions in marine environments. The sensor employs a self-designed cyclic peptide as an antifouling material, with 3,4-dihydroxyphenylalanine at both ends, forming a stable cyclic structure that firmly adheres to the electrode surface. The abundant carbonyl and hydroxyl groups on the peptide chains of cyclic peptides provide high hydrogen bond donor/acceptor ability, allowing them to form a hydration layer that resists adsorption of proteins or microorganisms at the sensing interface. Compared to straight-chain peptides, cyclic peptides exhibit superior stability. Furthermore, electrodes modified with cyclic peptides exhibit significantly improved antifouling performances, effectively mitigating biofouling by extracellular polymeric substances and microorganisms, such as Escherichia coli and Staphylococcus aureus. More importantly, the sensor can maintain good long-term stability over a period of 50 days. The strategy of incorporating antifouling cyclic peptides into marine sensors is expected to construct marine sensing devices with robust performance in the ocean.