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A disposable electrochemical sensor based on protein G for High-Density Lipoprotein (HDL) detection
H Chammem1, I Hafaid1, N Bohli1
1Carthage University, National Institute of Applied Science and Technology, Physics Department and Instrumentation, Centre Urbain Nord, Bp676, 1080 Charguia Cedex, Tunisia.
Talanta
|October 11, 2015
Summary
Two novel biosensors detect High-Density Lipoprotein (HDL) particles, crucial biomarkers for cardiovascular risk and atherosclerosis. These devices utilize electrochemical impedance spectroscopy for sensitive detection and differentiation of HDL, aiding in risk assessment.
Area of Science:
- Biomedical Engineering
- Analytical Chemistry
- Cardiovascular Research
Background:
- High-Density Lipoproteins (HDL) are key biomarkers inversely correlated with cardiovascular disease risk.
- HDL particles are significant therapeutic targets for managing atherosclerosis.
- Accurate detection and characterization of HDL are essential for clinical diagnostics.
Purpose of the Study:
- To develop and validate two novel biosensors for the detection of High-Density Lipoprotein (HDL) particles.
- To investigate the electrochemical properties and performance of the biosensors for HDL quantification.
- To assess the biosensors' ability to differentiate HDL particles based on size and antibody interactions.
Main Methods:
- Development of biosensors using interdigitated gold electrodes functionalized with Anti-ApoA1 antibodies and Protein G.
- Electrochemical characterization employing Impedance Spectroscopy (IS).
- Analysis of surface properties using Dynamic Contact Angle and Atomic Force Microscopy (AFM).
Main Results:
- The biosensors achieved detection limits of 50 ng/mL for native plasma HDL and 1 ng/mL for reconstituted HDL (rHDL).
- Impedance Spectroscopy effectively measured the electrochemical properties of the grafted antibodies.
- The biosensors demonstrated the capability to distinguish between HDL particles of varying sizes and binding affinities.
Conclusions:
- The developed biosensors offer a sensitive and specific method for detecting and differentiating HDL particles.
- These biosensors hold potential for improved cardiovascular risk assessment and monitoring of atherosclerosis.
- The findings highlight the utility of electrochemical biosensing for analyzing complex lipoprotein structures.
