Impedance sensing of allergen–antibody interaction on glassy carbon electrode modified by gold electrodeposition

Gold nanoparticle-based electrochemical biosensors

“…Impedance sensing was also used to detect allergen-antibody interaction on a GCE modified by gold electrodeposition [60]. In this application, allergen Der f2 was immobilized through gold nanocrystals deposited on the electrode surface, the chargetransfer kinetics of the [Fe(CN) 6 ] 3−/4− redox pair being monitored.…”

Ionic‐Liquid‐Doped Polyaniline Inverse Opals: Preparation, Characterization, and Application for the Electrochemical Impedance Immunoassay of Hepatitis B Surface Antigen

“…However, the increases of DR et were not obvious at higher antigen concentrations due to steric hindrance or saturation of coupled antigen molecules. [53] Since the isoelectric point (pI) of HBsAg is 4.6, it is negatively charged at pH 7.0, [54][55][56] and the electron transfer of the [Fe(CN) 6 ] 3À/4À redox couple can be blocked severely due to the negative charges carried by HBsAg molecules. In addition, the conductivity of HBsAg is poor, and small amounts of HBsAg on the electrode surface result in great changes in EIS responses.…”

A label-free electrochemiluminescence immunosensor based on KNbO3–Au nanoparticles@Bi2S3 for the detection of prostate specific antigen

“…The values of them were also fitted by using ZSimWin software and the relevant data were shown in Table 1. Ideally, Z W and R s represented the properties of the electrolyte solution and diffusion of the redox probe, thus they were not affected by modifications occurring on the electrode surface (Huang et al, 2007;Yang and Li, 2005). The modification processes of the electrode only changed R et , which was a suitable indicator for displaying the interfacial property of the modified glassy carbon electrode.…”