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The Use of a β-lactamase-based Conductimetric Biosensor Assay to Detect Biomolecular Interactions

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A sepiolite modified conducting polymer based biosensor.

Saniye Soylemez¹, Fulya Ekiz Kanik², Simge Tarkuc³

¹Department of Chemistry, Middle East Technical University, Ankara 06800, Turkey.

Colloids and Surfaces. B, Biointerfaces

|July 30, 2013

Summary

This summary is machine-generated.

A novel amperometric cholesterol biosensor was developed using a conducting polymer modified with sepiolite. This highly sensitive and fast biosensor accurately determines total cholesterol in food samples.

Keywords:

Amperometric biosensor Cholesterol biosensor Cholesterol oxidase Clay Conducting polymer Sepiolite

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Area of Science:

Electrochemistry
Biosensor Technology
Polymer Science

Background:

Cholesterol detection is crucial for food safety and health monitoring.
Existing biosensors often face challenges with sensitivity, speed, and cost-effectiveness.

Purpose of the Study:

To develop a novel, highly sensitive, and fast amperometric cholesterol biosensor.
To utilize a conducting polymer modified with sepiolite for enhanced enzyme immobilization.

Main Methods:

Synthesis of a novel monomer (PHED) and its electropolymerization on a graphite electrode.
Immobilization of cholesterol oxidase onto the polymer matrix using sepiolite.
Characterization of the biosensor's performance, including kinetic parameters, LOD, and sensitivity.

Main Results:

The developed biosensor demonstrated high sensitivity (1.64 mA/mMcm²) and a low limit of detection (0.036 μM).
Michaelis-Menten kinetics yielded apparent Michaelis constant (KM(app)) of 0.031 mM and maximum current (Imax) of 6.06 μA.
The biosensor showed stability and effectiveness in determining total cholesterol in food samples.

Conclusions:

A cost-effective and accurate cholesterol biosensor was successfully developed.
The combination of PHED polymer and sepiolite offers a promising matrix for enzyme immobilization.
This biosensor holds potential for practical applications in food analysis.