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Published on: October 9, 2012
Novel Efficient Selenium-Based D-π-A NIR Polymer Dots Anodic Electrochemiluminescence Emitter and Its Application in
Ziwang Mao1, Chenji Dai1, Yaoyao Xu1
1School of Chemistry and Life Sciences, Jiangsu Key Laboratory for Environmental Functional Materials, Suzhou University of Science and Technology, Suzhou 215009, China.
Insights
A novel selenium-based polymer dot (Se-Pdots) biosensor offers a sensitive and reliable method for the simultaneous detection of Streptococcus pneumoniae and Mycoplasma pneumoniae, key pathogens in childhood pneumonia.
Area of Science:
- Materials Science: Development of novel selenium-based polymer dots (Se-Pdots) with efficient near-infrared electrochemiluminescence (NIR ECL).
- Analytical Chemistry: Construction of a potential-resolved ECL biosensor for simultaneous pathogen detection.
- Biotechnology: Application of ECL biosensor for sensitive detection of Community-Acquired Pneumonia (CAP) pathogens.
Background:
- Community-acquired pneumonia (CAP) is a leading cause of mortality in children under five globally.
- Streptococcus pneumoniae and Mycoplasma pneumoniae are primary bacterial and atypical pathogens causing severe CAP.
- Current diagnostic methods for CAP lack the desired speed, cost-efficiency, and accuracy for early detection.
Purpose of the Study:
- To synthesize novel D-π-A selenium-based polymer dots (Se-Pdots) with efficient NIR ECL.
- To construct a sensitive and reliable electrochemiluminescence (ECL) biosensor for simultaneous detection of S. pneumoniae and M. pneumoniae.
- To provide a straightforward and cost-efficient diagnostic tool for CAP.
Main Methods:
- Copolymerization of benzo[1,2-c;4,5-c']bis([1,2,5]thiadiazole) (BBT) with poly(9,9-dioctylfluorene) (PF) and dithienylbenzoselenadiazole (DBS) to create Se-Pdots.
- Fabrication of a dual-emitter ECL biosensor using Se-Pdots as the anodic emitter and CdS quantum dots (QDs) as the cathodic emitter.
- Optimization of ECL detection conditions for simultaneous quantification of S. pneumoniae and M. pneumoniae.
Main Results:
- Novel Se-Pdots exhibiting efficient anodic ECL in a TPrA/K2S2O8 coreaction system were successfully synthesized.
- The developed ECL biosensor demonstrated simultaneous detection capabilities for both S. pneumoniae and M. pneumoniae.
- The biosensor achieved a wide linear range (10^-15 to 10^-9 M) and ultra-low detection limits (0.56 fM for S. pneumoniae, 0.96 fM for M. pneumoniae).
Conclusions:
- The novel Se-based NIR Pdots are effective emitters for ECL applications.
- The proposed ECL biosensor offers a highly sensitive, specific, and reliable platform for simultaneous detection of CAP pathogens.
- This method holds significant potential for rapid and accurate clinical diagnosis of CAP in children.
Abstract:
Community-acquired pneumonia (CAP) is a major cause of death in children under 5 years old globally. With Streptococcus pneumoniae (S. pneumoniae) and Mycoplasma pneumoniae (M. pneumoniae) being the main pathogens linked to CAP that requires hospitalization, there is an urgent need for a straightforward, cost-efficient, and highly accurate diagnostic method for immediate and early detection of CAP. In this work, benzo[1,2-c;4,5-c']bis([1,2,5]thiadiazole) (BBT) as π-bridge spacer with the donor unit of poly(9,9-dioctylfluorene) (PF) and the acceptor unit of dithienylbenzoselenadiazole (DBS) has been successfully copolymerized to unprecedentedly prepare novel D-π-A selenium-based polymer dots with efficient NIR electrochemiluminescence (named as Se-Pdots in this work). Se-Pdots exclusively generated excellent anodic ECL in the two-component coreaction system comprising TPrA and K2S2O8. Moreover, a potential-resolved ECL biosensor to simultaneously detect S. pneumoniae and M. pneumoniae has also been successfully constructed based on this novel Se-based NIR Pdots as an anodic emitter with CdS QDs as a cathodic emitter. Under optimal conditions, the biosensor has a wide linear range for S. pneumoniae (10-15 to 10-9 M) and M. pneumoniae (10-15 to 10-9 M), with low detection limits for S. pneumoniae (0.56 fM) and M. pneumoniae (0.96 fM). The proposed ECL biosensor provides a simple, sensitive, and reliable method for the simultaneous detection of CAP pathogens in clinical applications.
