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Updated: Feb 16, 2026
Design and Development of Aptamer–Gold Nanoparticle Based Colorimetric Assays for In-the-field Applications
Published on: June 23, 2016
A highly sensitive gold nanoparticle-based electrochemical aptasensor for theophylline detection.
Xifeng Chen1, Zhenzhen Guo2, Yuguo Tang2
1CAS Key Lab of Bio-Medical Diagnostics, Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou, 215163, PR China; Tianjin Guoke Jiaye Medical Technology Development Co., LTD, Tianjin, 300399, PR China.
This study presents a novel electrochemical biosensor for detecting theophylline, a common asthma medication. The aptasensor utilizes RNA aptamers and gold nanoparticles for sensitive and selective theophylline quantification in serum samples.
Area of Science:
- Biomedical Engineering
- Analytical Chemistry
- Nanotechnology
Background:
- Theophylline is a crucial bronchodilator for respiratory conditions like asthma, bronchitis, and emphysema.
- Therapeutic theophylline use requires strict monitoring due to its narrow therapeutic index and potential toxicity at elevated concentrations.
- Existing detection methods may lack the sensitivity or specificity required for precise therapeutic drug monitoring.
Purpose of the Study:
- To develop a highly sensitive and selective electrochemical biosensor for theophylline detection.
- To leverage RNA aptamer recognition and gold nanoparticle (AuNP)-based signal amplification for enhanced detection.
- To validate the biosensor's capability for quantitative theophylline analysis in biological matrices, such as serum samples.
Main Methods:
- Design of an electrochemical aptasensor involving two RNA probes and a DNA tetrahedron nanostructure immobilized on a gold electrode.
- Modification of gold nanoparticles (AuNPs) with one RNA probe and methylene blue (MB) as an electrochemical label.
- Utilizing theophylline-induced proximity of AuNPs and the electrode surface to generate an amplified electrochemical signal.
Main Results:
- The aptasensor demonstrated significant electrochemical signal generation upon theophylline binding, directly correlating with its concentration.
- The proposed method exhibited excellent sensitivity and selectivity for theophylline detection.
- Successful quantitative detection of theophylline in serum samples was achieved, indicating clinical applicability.
Conclusions:
- The developed RNA aptamer-based electrochemical biosensor offers a promising platform for sensitive and selective theophylline detection.
- The AuNP-based amplification strategy significantly enhances the detection performance.
- This aptasensor has the potential for routine therapeutic drug monitoring of theophylline in clinical settings.
