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Fabrication of Electrochemical-DNA Biosensors for the Reagentless Detection of Nucleic Acids, Proteins and Small Molecules

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A label-free method for detecting biothiols based on poly(thymine)-templated copper nanoparticles.

Lin Zhang¹, Qi-Yong Cai¹, Jie Li¹

¹College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, PR China.

Biosensors & Bioelectronics

|February 24, 2015

Summary

A new nanosensor detects cysteine, glutathione, and homocysteine using fluorescent copper nanoparticles. This simple, cost-effective assay offers high sensitivity for biothiol detection in biological samples.

Keywords:

Copper nanoparticles Cysteine Glutathione Homocysteine Label-free Thymine-Hg(II)-thymine

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A Polyaniline-based Sensor of Nucleic Acids

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Published on: November 1, 2016

Area of Science:

Biochemistry
Nanotechnology
Analytical Chemistry

Background:

Biothiols like cysteine, glutathione, and homocysteine are crucial biomarkers.
Accurate detection of biothiols is vital for diagnosing various diseases.
Existing detection methods can be complex or lack sensitivity.

Purpose of the Study:

To develop a novel, label-free nanosensor for sensitive biothiol detection.
To utilize poly(thymine)-templated fluorescent copper nanoparticles (CuNPs) for this purpose.
To establish a cost-effective and simple platform for biothiol analysis.

Main Methods:

Fabrication of fluorescent copper nanoparticles (CuNPs) templated by poly(thymine).
Control of CuNP fluorescence via thymine-Hg(II)-thymine coordination.
Development of a turn-on sensing mechanism for biothiol detection.

Main Results:

The nanosensor successfully detected cysteine, glutathione, and homocysteine.
Achieved low detection limits: 12.5 nM for cysteine, 15 nM for glutathione, and 20 nM for homocysteine.
Demonstrated high selectivity against other amino acids and validated in biological fluids.

Conclusions:

The developed poly(thymine)-templated CuNP nanosensor is a sensitive and selective platform for biothiol detection.
The label-free, turn-on assay is simple, cost-effective, and suitable for real-world applications.
This method shows promise for the clinical diagnosis and monitoring of conditions related to biothiol levels.