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Simple Bulk Readout of Digital Nucleic Acid Quantification Assays

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Published on: September 24, 2015

Amperometric quantification based on serial dilution microfluidic systems.

Khaled Stephan¹, Patrick Pittet, Monique Sigaud

¹Institut des Nanotechnologies de Lyon, INL, CNRS UMR5270, Université de Lyon, Lyon, F-69003, France.

|February 25, 2009

Summary

This summary is machine-generated.

This study presents a microfluidic device for rapid amperometric quantification. It uses on-chip calibration and standard addition methods for accurate, time-efficient analysis of electroactive molecules.

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Area of Science:

Analytical Chemistry
Microfluidics
Electrochemistry

Background:

Microfluidic devices offer advantages in reduced sample consumption and analysis time.
Accurate quantification often relies on reliable calibration methods, which can be affected by sensor drift.
Standard addition and calibration curves are common quantification techniques.

Purpose of the Study:

To develop and evaluate a novel microfluidic device for amperometric quantification.
To integrate on-chip calibration and standard addition methods for improved accuracy and efficiency.
To compare the performance of on-chip standard addition versus calibration curves in a microfluidic system.

Main Methods:

Fabrication of a poly(dimethylsiloxane) microfluidic device with an integrated network of gold (Au) electrodes.
Characterization using fluorescence microscopy.
Evaluation with a model electroactive molecule, ferro/ferricyanide (Fe(CN)6(4-/3-)).
Implementation of automated solution preparation for linearly decreasing concentrations.

Main Results:

The microfluidic device enabled amperometric quantification with concentration estimations better than 5% accuracy.
On-chip calibration and standard addition methods were successfully integrated.
The standard addition method proved less complex to operate than the calibration curve approach, mitigating flow rate discrepancy issues.
Reduced analysis time was achieved compared to traditional batch processing.

Conclusions:

The developed microfluidic device provides a robust platform for accurate and efficient amperometric quantification.
On-chip standard addition offers a simpler and more reliable quantification strategy within the microfluidic system.
This approach enhances analytical throughput and addresses sensor response variability over time.