Labeless immunosensor assay for the stroke marker protein neuron specific enolase based upon an alternating current...

Area of Science:

• Biosensors
• Electrochemistry
• Biomarker Detection

Background:

• Neuron-specific enolase (NSE) is a crucial biomarker.
• Existing detection methods can be complex or require labels.
• Development of sensitive, label-less detection systems is needed.

Purpose of the Study:

• To develop and characterize a label-less immunosensor for neuron-specific enolase (NSE).
• To utilize an AC impedance protocol for sensor interrogation.
• To establish a sensitive and specific method for NSE quantification.

Main Methods:

• Fabrication of a microarray immunosensor using screen-printed carbon electrodes.
• Modification with poly(1,2-diaminobenzene) and polyaniline for enhanced surface area.
• Immobilization of anti-NSE antibodies via avidin-biotin linkage.
• Interrogation using AC impedance spectroscopy.

Main Results:

• The immunosensor demonstrated a concentration-dependent impedimetric response to NSE.
• A linear relationship was observed between impedance and NSE concentration (0-50 pg/mL).
• Controls using non-specific IgG antibodies effectively eliminated non-specific adsorption effects.

Conclusions:

• A label-less immunosensor for NSE detection was successfully developed.
• The AC impedance protocol provides a sensitive and quantitative method for NSE measurement.
• This approach offers a promising tool for NSE biomarker analysis.