An in situ electrochemical surface plasmon resonance immunosensor with polypyrrole propylic acid film: comparison between SPR and electrochemical responses from polymer formation to protein immunosensing.
A novel in situ electrochemical surface plasmon resonance (EC-SPR) immunosensor is presented in this paper. The EC-SPR measurement can be used to in situ monitor the polymer formation, probe immobilization, antigen-antibody interaction and protein immunosensing process. A sandwich immunosensor based on permeable polypyrrole propylic acid (PPA) film is constructed using mouse IgG as a model analyte. The results show that the introduction of capture antibody conjugated enzyme not only enhances the current responses but also increases the SPR angle shift. The calibration curves of electrochemical (EC) and surface plasmon resonance (SPR) measurement exhibit a similar dependence on the bulk concentration of antigen. An approximate linear relationship can be obtained by plotting the data in semi-logarithmic reference frame. Compared with SPR, EC shows higher sensitivity with prolonged time. The in situ EC-SPR immunosensor described herein could have important potentials for diagnostics and medicine applications.
Dong
Hua
H
School of Chemical & Biomedical Engineering, Center for Advanced Bionanosystems, Nanyang Technological University, Singapore, Singapore.
Cao
Xiaodong
X
Li
Chang Ming
CM
Hu
Weihua
W
D000818:Animals; D015374:Biosensing Techniques / Q000295:instrumentation* / Q000379:methods; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007118:Immunoassay / Q000295:instrumentation* / Q000379:methods; D007074:Immunoglobulin G / Q000032:analysis*; D051379:Mice; D011422:Propionates / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D020349:Surface Plasmon Resonance / Q000295:instrumentation* / Q000379:methods
D007074:Immunoglobulin G; D011422:Propionates; D011758:Pyrroles; C518858:polypyrrolepropylic acid