Lee, Hyunjung Keem, Joo Oak Cho, Hyunmin Choi, Jong Min Chung, Won Seok Jeon, Dae-Young Lee, Dong Su Shin, Yong-Beom 2024-01-19T21:32:25Z 2024-01-19T21:32:25Z 2021-09-04 2018-10-30 0956-5663 https://pubs.kist.re.kr/handle/201004/120764 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. English ELSEVIER ADVANCED TECHNOLOGY ESCHERICHIA-COLI O157-H7 RESISTANT STAPHYLOCOCCUS-AUREUS RAPID DETECTION IMMUNOMAGNETIC SEPARATION PATHOGENIC BACTERIA FLOW-CYTOMETRY REAL-TIME PCR BIOSENSORS IDENTIFICATION High-performance nanogap electrode-based impedimetric sensor for direct DNA assays Article 10.1016/j.bios.2018.07.050 1 BIOSENSORS & BIOELECTRONICS, v.118, pp.153 - 159 BIOSENSORS & BIOELECTRONICS 118 153 159 scie scopus 000444358000020 2-s2.0-85050753330 Biophysics Biotechnology & Applied Microbiology Chemistry, Analytical Electrochemistry Nanoscience & Nanotechnology Biophysics Biotechnology & Applied Microbiology Chemistry Electrochemistry Science & Technology - Other Topics Article ESCHERICHIA-COLI O157-H7 RESISTANT STAPHYLOCOCCUS-AUREUS RAPID DETECTION IMMUNOMAGNETIC SEPARATION PATHOGENIC BACTERIA FLOW-CYTOMETRY REAL-TIME PCR BIOSENSORS IDENTIFICATION Nanogap Impedimetric sensor Direct DNA assay MecA gene Theoretical calculation Label-free