Adsorption and Electrooxidation of DNA at Glassy Carbon Paste Electrodes

Gr-Pt hybrid NP modified GCPE as label and indicator free electrochemical genosensor platform

Glassy carbon paste electrode (GCPE) was modified with graphene platinum hybrid nanoparticle (Gr-Pt hybrid NP) and used as a transducer for label and indicator free electrochemical genosensor. 22 mer oligonucleotides representing Escherichia coli bacteria were used as a model case. As far as it is known, this study is the first study where Gr-Pt hybrid NP was incorporated into GCPE and used for genosensor transducer. The extent of hybridization was determined by using differential pulse voltammetric signals of guanin oxidation. After the optimization of experimental parameters, analytical characteristics were investigated. The linear range was found between 1.5×10(-7) and 2.25×10(-6) M with the equation of y=1.6566x-2.6161 and R(2) of 0.9959. RSD and LOD were calculated as 4.2% (n=6) and 1.12×10(-9) M respectively.

Label and indicator free electrochemical nanobiosensing of DNA hybridization based on MnO2 nanomaterial modified GCPE

A label and indicator free electrochemical DNA hybridization detection method based on MnO₂-Nps/GCPE was developed. Compared to plain GCPE, a very robust and sensitive genosensor was obtained.