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<p>Electrochemical detection of foodborne pathogens requires simplified electrode modification and enhanced sensitivity. This study introduced Cd-decorated ternary FeCoNi layered double hydroxides (Cd-FeCoNi LDHs) platform for label-free <i>Staphylococcus aureus</i> (<i>S. aureus</i>) detection via Cu<sup>2+</sup> biosorption. The FeCoNi LDHs were engineered with optimized metal sites to create lamellar structures with high electrocatalytic surface area. Further incorporating with Cd particles deposition, the response of the Cd-FeCoNi LDHs to Cu<sup>2+</sup> exhibited a double-enhanced differential pulse voltammetry signal. Concurrently, <i>S. aureus</i> has been explored to adsorb Cu<sup>2+</sup> through surface carboxyl and phosphate groups. By integrating with specific magnetic separation, the variation of Cu<sup>2+</sup> derived from biosorption by <i>S. aureus</i> triggered the rapid electrical response of the Cd-FeCoNi LDHs platform. This approach achieved 5.4 CFU/mL detection without bio-labeling, while resisting matrix interference. This work highlighted the innovative application of bacterial metal ions biosorption and label-free sensing platform for foodborne pathogen detection.</p><p></p>

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Boosted electrocatalytic activity on FeCoNi LDHs incorporating Cd deposition for Staphylococcus aureus detection

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月5日

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  • Huamin Zhao,
  • Xiaoxi Zheng,
  • Jihao Su,
  • Jun Wang,
  • Xinrui Wang,
  • Hang Li,
  • Juan Wang,
  • Kexin Shen,
  • Chao Zhao

摘要

Electrochemical detection of foodborne pathogens requires simplified electrode modification and enhanced sensitivity. This study introduced Cd-decorated ternary FeCoNi layered double hydroxides (Cd-FeCoNi LDHs) platform for label-free Staphylococcus aureus (S. aureus) detection via Cu2+ biosorption. The FeCoNi LDHs were engineered with optimized metal sites to create lamellar structures with high electrocatalytic surface area. Further incorporating with Cd particles deposition, the response of the Cd-FeCoNi LDHs to Cu2+ exhibited a double-enhanced differential pulse voltammetry signal. Concurrently, S. aureus has been explored to adsorb Cu2+ through surface carboxyl and phosphate groups. By integrating with specific magnetic separation, the variation of Cu2+ derived from biosorption by S. aureus triggered the rapid electrical response of the Cd-FeCoNi LDHs platform. This approach achieved 5.4 CFU/mL detection without bio-labeling, while resisting matrix interference. This work highlighted the innovative application of bacterial metal ions biosorption and label-free sensing platform for foodborne pathogen detection.