Flexible and highly ordered nanopillar electrochemical sensor for sensitive insulin evaluation
Yoo Min Park1, Young Sun Choi1, Hye-Rim Lee1
1Nano-bio Application Team, National NanoFab Center (NNFC), Daejeon, 34141, Republic of Korea.
Biosensors & Bioelectronics
|May 23, 2020
Summary
Researchers developed a novel nanopillar electrode for highly sensitive detection of insulin, a key biomarker for obesity and insulin resistance. This flexible electrode offers a 10x improvement in sensitivity over commercial options, aiding in early disease detection.
Area of Science:
- Biomaterials Science
- Electrochemical Sensors
- Nanotechnology
Background:
- Obesity management research is driving demand for sensitive biomarker analysis.
- Existing methods for detecting low-level biomarkers like insulin often lack sufficient sensitivity and reproducibility.
- Highly ordered nanostructures offer potential for enhanced electrochemical sensing capabilities.
Purpose of the Study:
- To develop a highly sensitive and reproducible nanopillar electrode for detecting insulin, a biomarker for obesity and insulin resistance.
- To fabricate a flexible electrode using electron beam lithography and gold evaporation on polyurethane.
- To establish an enzyme catalysis-based electrochemical immunoassay for insulin quantification.
Main Methods:
- Fabrication of a highly ordered nanopillar electrode (500 nm diameter, 1500 nm height) using electron beam lithography and gold evaporation on a flexible polyurethane substrate.
- Development of a self-assembled monolayer for enzyme immobilization and an electrochemical immunoassay.
- Quantification of insulin using square wave voltammetry to measure horseradish peroxidase (HRP)-based electrochemical signals.
- Analysis of insulin in real plasma samples.
Main Results:
- The nanopillar electrode demonstrated high sensitivity with a limit of detection (LOD) of 0.1 ng/mL for insulin.
- Excellent reproducibility was achieved, with variations below 10%.
- The sensitivity of the nanopillar electrode was approximately 10 times (1020%) higher than that of commercial electrodes.
- Successful detection of insulin in human plasma samples within the 0.1 to 1.0 ng/mL range.
Conclusions:
- The developed highly ordered nanopillar electrode provides a precise and sensitive platform for analyzing low-level biomolecules.
- This technology shows significant promise for applications in medical diagnostics and commercial fields, particularly for obesity-related biomarker monitoring.
- The enhanced electron transfer and high surface area of the nanopillar structure contribute to its superior sensing performance.
