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Sensors 2010, 10(10), 9481-9492; doi:10.3390/s101009481
Article

Study on a Luminol-based Electrochemiluminescent Sensor for Label-Free DNA Sensing

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Received: 18 August 2010 / Revised: 25 September 2010 / Accepted: 8 October 2010 / Published: 21 October 2010
(This article belongs to the Section Physical Sensors)
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Abstract

Automatic, inexpensive, simple and sensitive methods for DNA sensing and quantification are highly desirable for biomedical research. The rapid development of both the fundamentals and applications of electrochemiluminescence (ECL) over the past years has demonstrated its potential for analytical and bio-analytical chemistry. This paper reports the quenching effect of DNA on the ECL of luminol and the further development of a DNA sensing device. With the pre-functionalization by a composite of carbon nano-tubes (CNTs) and Au nanoparticles (AuNPs), the sensor provides a novel and valuable label-free approach for DNA sensing. Here the ECL intensity was remarkably decreased when more than 1.0 × 10−12 molar of DNA were adsorbed on the sensor. Linearity of the DNA amount with the reciprocal of ECL intensity was observed. A saturated sensor caused a 92.8% quenching effect. The research also proposes the mechanism for the quenching effect which could be attributed to the interaction between luminol and DNA and the elimination of reactive oxygen species (ROSs) by DNA.
Keywords: DNA; label-free sensing; electrochemiluminescence; nano-prefunctional sensor; quenching effect DNA; label-free sensing; electrochemiluminescence; nano-prefunctional sensor; quenching effect
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Chu, H.-H.; Yan, J.-L.; Tu, Y.-F. Study on a Luminol-based Electrochemiluminescent Sensor for Label-Free DNA Sensing. Sensors 2010, 10, 9481-9492.

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