High-performance nanogap electrode-based impedimetric sensor for direct DNA assays

Title
High-performance nanogap electrode-based impedimetric sensor for direct DNA assays
Authors
이동수전대영Hyunjung LeeJoo Oak KeemHyunmin ChoJong Min ChoiYong-Beom ShinWon Seok Chung
Keywords
Nanogap; Label-free; Impedimetric sensor; Direct DNA assay; MecA gene; Theoretical calculation
Issue Date
2018-10
Publisher
Biosensors and bioelectronics
Citation
VOL 118-159
Abstract
The rapid and sensitive detection of pathogen DNA (Deoxyribonucleic acid) would be essential for diagnosis and appropriate antibiotic treatment time. Herein, we report a novel direct DNA detectable impedimetric sensor. Direct assay of the amplified target DNA (mecA gene from methicillin-resistant Staphylococcus aureus (MRSA)) was performed using the PCR (polymerase chain reaction) product without any purification. Even though there are lots of PCR reagents and excess salts in sample PCR product, the nanogap electrode-based impedimetric sensor was able to detect DNA amplification fast in 5th PCR cycle which had 260 fM mecA gene in sample originally. The 70  nm gap electrode sensor yielded over 20% signal increase at the 5th PCR cycle and the impedance change grew up to about 60% at 25th in case of sample with 260 fM mecA gene template originally. The increased concentration of target DNA template led to the rise in impedance change such as 60% up at 5th and 120% up at 25th cycle with 260  pM, respectively. It is very outstanding result as compared with the traditional PCR agarose gel. Besides, it is 7-fold superior sensitivity to the microgap electrode. Furthermore, genomic DNA sample extracted from MRSA was detected rapidly. The nanogap electrode-based impedimetric sensor could be a good candidate for a rapid, sensitive, and low-cost electrical biosensor for DNA characterization in diagnostics and disease monitoring.
URI
http://pubs.kist.re.kr/handle/201004/67946
ISSN
0956-5663
Appears in Collections:
KIST Publication > Article
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