Reduced Graphene Oxide Modified the Interdigitated Chain Electrode for an Insulin Sensor.

Area of Science:

• * Materials Science: Development of novel nanomaterials for biosensing applications.
• * Electrochemistry: Application of electrochemical techniques for sensor fabrication and characterization.
• * Biomedical Engineering: Design of biosensors for disease biomarker detection.

Background:

• * Insulin is a critical hormone regulating glucose homeostasis; its dysregulation leads to diabetic disorders.
• * Accurate and early detection of insulin levels is crucial for managing diabetes.
• * Existing methods for insulin detection can be complex, time-consuming, and require specialized equipment.

Purpose of the Study:

• * To develop a label-free, direct capacitive sensor for insulin detection.
• * To utilize reduced graphene oxide (rGO) modified interdigitated chain electrodes (ICE) for enhanced sensitivity.
• * To establish a real-time monitoring system for insulin concentration in human serum.

Main Methods:

• * Electrochemical deposition of reduced graphene oxide (rGO) onto an interdigitated chain electrode (ICE).
• * Modification of the rGO-ICE with self-assembled monolayers and insulin antibodies for specific binding.
• * Capacitive detection and impedance spectroscopy to quantify insulin concentration based on capacitance change (ΔC).

Main Results:

• * The rGO-modified ICE demonstrated effective immobilization of insulin antibodies.
• * A significant capacitance change (ΔC) was observed correlating with insulin concentrations from 1 ng/mL to 10 µg/mL.
• * The sensor provided sensitive and quantitative detection of insulin in human serum samples.

Conclusions:

• * The developed rGO-ICE sensor offers a sensitive and label-free approach for direct insulin detection.
• * This technology is suitable for real-time monitoring and point-of-care diagnosis of diabetic disorders.
• * The sensor shows promise for improving diabetes management through accessible and rapid biomarker quantification.