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Related Experiment Video

Updated: Mar 9, 2026

Simple Bulk Readout of Digital Nucleic Acid Quantification Assays

Simple Bulk Readout of Digital Nucleic Acid Quantification Assays

Published on: September 24, 2015

Combined microfluidic-optical DNA analysis with single-base-pair sizing capability.

Markus Pollnau¹, Manfred Hammer², Chaitanya Dongre³

¹Integrated Optical Microsystems Group, MESA + Institute for Nanotechnology, University of Twente, P. O. Box 217, 7500 AE Enschede, The Netherlands; Department of Materials and Nano Physics, School of Information and Communication Technology, KTH-Royal Institute of Technology, Electrum 229, Isafjordsgatan 22-24, 16440 Kista, Sweden.

Biomedical Optics Express

|December 27, 2016

Summary

This summary is machine-generated.

This study presents a novel optofluidic chip for DNA sequencing using capillary electrophoresis (CE). The developed system achieves high precision for detecting genetic variations, crucial for diagnosing inherited diseases.

Keywords:

(130.3120) Integrated optics devices (170.3890) Medical optics instrumentation

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Published on: September 10, 2014

Area of Science:

Optofluidics
Genomics
Analytical Chemistry

Background:

DNA sequencing is vital for identifying genetic disorders.
Capillary electrophoresis (CE) offers high-speed, low-volume DNA analysis.
Detecting single base-pair DNA variations requires high precision (variance < 10⁻³).

Purpose of the Study:

To develop an optofluidic chip for precise DNA fragment size analysis.
To achieve a variance below 10⁻³ for detecting single base-pair insertions/deletions.
To evaluate calibration strategies for optimizing CE performance.

Main Methods:

Microchip capillary electrophoresis (CE) integrated with a femtosecond-laser-written optical waveguide.
Separation of differently fluorescently labeled DNA fragments (blue and red).
Dual-laser excitation with frequency modulation and photomultiplier detection; Fourier analysis for signal discrimination.

Main Results:

Demonstrated CE separation of 12 blue-labeled and 23 red-labeled DNA fragments.
Achieved a variance of approximately 4 × 10⁻⁴, surpassing the required precision.
Identified that fluorescent label choice and fit function significantly impact variance.

Conclusions:

The developed optofluidic chip enables highly precise DNA fragment size analysis.
The achieved variance is sufficient for detecting single base-pair insertions or deletions.
This technology holds promise for advancing genetic diagnostics and personalized medicine.