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Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System
Published on: June 13, 2010
Simultaneously fluorescence detecting thrombin and lysozyme based on magnetic nanoparticle condensation
Liqing Wang1, Lanying Li, Ying Xu
1Department of Chemistry, East China Normal University, Shanghai 200062, China.
Talanta
|July 7, 2009
Summary
This study introduces a novel fluorescent aptasensor for simultaneously detecting thrombin and lysozyme. The method utilizes magnetic separation and aptamers for sensitive and selective protein quantification in biological samples.
Area of Science:
- Biomedical Engineering
- Analytical Chemistry
- Biochemistry
Background:
- Accurate detection of biomarkers like thrombin and lysozyme is crucial for disease diagnosis.
- Existing methods for simultaneous protein detection can be complex and lack sensitivity.
Purpose of the Study:
- To develop a sensitive and selective fluorescent aptasensor for the simultaneous detection of thrombin and lysozyme.
- To validate the aptasensor's performance using real plasma samples.
Main Methods:
- Immobilization of anti-thrombin and anti-lysozyme aptamers onto magnetic nanoparticles for protein capture.
- Labeling of complementary aptamers with fluorescent dyes (rhodamine B and fluorescein) for signal reporting.
- Application of a sandwich assay strategy combined with magnetic separation for simultaneous detection.
Main Results:
- The aptasensor demonstrated high selectivity and sensitivity for both thrombin and lysozyme.
- Linear detection ranges were established: 0.13-4 nM for thrombin and 0.56-12.3 nM for lysozyme.
- Low detection limits were achieved: 0.06 nM for thrombin and 0.2 nM for lysozyme.
Conclusions:
- The proposed fluorescent aptasensor enables simultaneous, sensitive, and selective detection of thrombin and lysozyme.
- The method shows promise for analyzing multiple proteins in complex biological matrices like plasma.
