An impedimetric label-free genosensor for high sensitive DNA detection is developed. This system is based on a screen-printed carbon electrode modified with the thionine layer and iridium oxide nanoparticles (IrO 2 NP). An aminated oligonucleotide probe is immobilized on the IrO 2 NP/polythionine modified electrode and ethanolamine was used as a blocking agent. Different diluted PCR amplified DNA samples have been detected. The selectivity and reproducibility of this system are studied and the system was highly reproducible with RSD E 15% and sensitive enough while using 2% of ethanolamine during the blocking step employed for genosensor preparation.Scheme 1 Schematic representation of the procedure for the impedimetric label-free genosenor fabrication. Thionine electropolymerization (a), deposition of IrO 2 NPs (b), immobilization of ss-DNA (c), blocking step with etanolamine (d) and hybridization with a complementary target (e).
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