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Miniaturized lead sensor based on lead-specific DNAzyme in a nanocapillary interconnected microfluidic device
In-Hyoung Chang1, Joseph J Tulock, Juewen Liu
1Department of Chemistry and the Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, Illinois 61801, USA.
Environmental Science & Technology
|June 15, 2005
Summary
This study introduces a miniaturized sensor using a DNAzyme and microfluidics for sensitive lead (Pb2+) detection. The novel device achieves a low detection limit, showing promise for environmental lead analysis in water.
Area of Science:
- Analytical Chemistry
- Nanotechnology
- Biotechnology
Background:
- Lead (Pb2+) contamination poses significant environmental and health risks.
- Accurate and sensitive detection methods are crucial for monitoring lead levels.
Purpose of the Study:
- To develop a miniaturized sensor for selective and sensitive lead (Pb2+) detection.
- To integrate a DNAzyme recognition element with a microfluidic-nanofluidic device.
Main Methods:
- A lead-specific DNAzyme molecular beacon was employed as the recognition element.
- A microfluidic device with nanocapillary array interconnects was used for sample delivery and fluid manipulation.
- Laser-induced fluorescence detection was utilized for signal interrogation.
Main Results:
- The sensor demonstrated a linear response over a Pb2+ concentration range of 0.1 - 100 microM (r2 = 0.982).
- A low detection limit of 11 nM for Pb2+ was achieved.
- Accurate Pb2+ determination in an electroplating sludge reference material was performed, with results within 4.9% of the certified value.
Conclusions:
- The developed sensor shows high selectivity and sensitivity for lead (Pb2+) detection.
- This hybrid microfluidic-nanofluidic technology is suitable for analyzing complex environmental samples.
- The platform offers flexibility for detecting other analytes and creating multi-analyte sensing devices for field applications.