Electrochemical Impedance Spectroscopy Detection of Lysozyme Based on Electrodeposited Gold Nanoparticles

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Scientists have developed a highly sensitive and label-free electrochemical impedance spectroscopy (EIS) aptasensor for detecting lysozyme, a protein that plays a crucial role in the immune system. The aptasensor, developed by researchers at Beijing University of Aeronautics and Astronautics, utilizes gold nanoparticles (AuNPs) electrodeposited onto a gold electrode as a platform for immobilization of an anti-lysozyme aptamer. This innovative approach enables the detection of lysozyme with a detection limit of 0.01 pM and a linear range from 0.1 pM to 500 pM.

Key Takeaways:

  • The researchers developed a simple and highly sensitive EIS aptasensor for lysozyme detection using an anti-lysozyme aptamer as a molecular recognition element.
  • Gold nanoparticles (AuNPs) were electrodeposited onto a gold electrode to improve sensitivity and immobilize the aptamer.
  • The aptasensor demonstrated a detection limit of 0.01 pM and a linear range from 0.1 pM to 500 pM with changes in interfacial electron transfer resistance (R(et)).
  • The sensor showed good selectivity for lysozyme without being affected by other proteins.
  • The researchers utilized the redox couple of [Fe(CN)(6)](3-/4-) as a probe to monitor changes in R(et) for lysozyme detection.
  • The study demonstrates the potential of EIS-based aptasensors for molecular recognition and detection of biomolecules.

Statistics:

  • Detection limit: 0.01 pM
  • Linear range: 0.1 pM to 500 pM
  • Changes in R(et) increased with lysozyme concentration
  • The sensor showed good selectivity for lysozyme without being affected by other proteins

Sources:

  • Z. Chen et al., "Electrochemical impedance spectroscopy detection of lysozyme based on electrodeposited gold nanoparticles," Talanta, vol. 83, no. 5, pp. 1501-1506, 2011.