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A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis
Published on: September 10, 2014
Label free CMOS DNA image sensor based on the charge transfer technique
Y Maruyama1, S Terao, K Sawada
1Department of Electrical and Electronic Engineering, Toyohashi University of Technology, Japan. y.maruyama@tudelft.nl
Biosensors & Bioelectronics
|May 9, 2009
Summary
This study presents a novel CMOS DNA image sensor for label-free electronic detection of DNA. The sensor successfully quantifies DNA immobilization and hybridization, demonstrating its potential for integrated biosensing applications.
Area of Science:
- * Electronics and Electrical Engineering
- * Biotechnology and Biosensing
Background:
- * Label-free detection methods are crucial for efficient biosensing.
- * CMOS technology offers a platform for highly integrated and cost-effective sensor development.
Purpose of the Study:
- * To describe a novel 32x32 CMOS DNA image sensor for label-free electronic detection.
- * To demonstrate the sensor's capability in detecting DNA immobilization and hybridization.
- * To evaluate the sensor's performance metrics, including output voltage, DNA density, and detection limit.
Main Methods:
- * Fabrication of a 32x32 CMOS DNA image sensor using 1-poly 1-metal CMOS technology.
- * Utilizing a charge transfer technique for pixel operation.
- * Employing silane coating for DNA immobilization and hybridization detection.
Main Results:
- * Measured output voltages of 76.4+/-16.5 mV (immobilization) and 64.5+/-15.7 mV (hybridization).
- * Estimated immobilized DNA density at 6.3+/-1.4x10^8 cm^-2 and hybridized DNA density at 5.3+/-1.3x10^8 cm^-2.
- * Determined a DNA detection limit of approximately 2.7x10^7 cm^-2 molecules (22 bases).
Conclusions:
- * The developed CMOS DNA image sensor enables label-free, fully electronic detection of DNA.
- * Potentiometric detectability successfully verified DNA immobilization and hybridization processes.
- * The sensor is suitable for inexpensive, highly integrated biosensing applications.
