A simple and highly sensitive electrochemical platform for detection of microRNAs

Pawan Jolly, Lai Chun Caleb Wong, Anna Miodek, Mark Lindsay, Pedro Estrela

Research output: Chapter or section in a book/report/conference proceedingChapter in a published conference proceeding

6 Citations (SciVal)
272 Downloads (Pure)


MicroRNAs (miRNAs) in blood can act as fingerprints to many diseases including cancer. However, detection of low levels of these miRNAs in blood demands for
very sensitive techniques. Despite many reports available for miRNA detection, the available methodologies have drawbacks such as complexity, use of expensive enzymes, etc. We here report a new and simple electrochemical method to detect miRNAs by exploiting the intrinsic charges of the oligonucleotides and a simple amplification method with positively charged gold nanoparticles (AuNPs). Electrochemical impedance spectroscopy (EIS) was used to monitor the changes in capacitance upon miRNA binding without the need for redox markers. miRNA detection was also obtained through measurements of open circuit potential (OCP) variations. We demonstrate a promising cost effective biosensor using both EIS and OCP with a detection limit of 1 fM, which can easily be expanded into miRNA/DNA microarray platforms.
Original languageEnglish
Title of host publicationProceedings of IEEE Sensors 2015
Number of pages4
ISBN (Print)9781479982035
Publication statusPublished - 2015
Event2015 IEEE Sensors - Busan, Korea, Republic of
Duration: 1 Nov 20154 Nov 2015


Conference2015 IEEE Sensors
Country/TerritoryKorea, Republic of


Dive into the research topics of 'A simple and highly sensitive electrochemical platform for detection of microRNAs'. Together they form a unique fingerprint.

Cite this