Electrochemical Biosensing Platform Using Carbon Nanotube Activated Glassy Carbon Electrode

Carbon nanotube enhanced electrochemically activated glassy carbon electrode (GCE) has been prepared and applied for sensitive electrochemical determination of DNA and DNA bases. The results indicate that the relative activation could efficiently enhance electron transfer at the pretreated GCE so that this carbon nanotube activated glassy carbon electrode could provide relatively low detection limit with good reproducibility for the respective biomolecular determination. Besides, greatly enhanced sensitivity could be obtained for the relevant electrochemical detection of the bio‐recognition process including DNA biosensing by using the carbon nanotube activated GCE. This approach provided a detection limit of 7.5 nM for guanine and 150 ng/mL for acid denatured DNA. These observations suggest that the carbon nanotube activated glassy carbon electrode could be utilized as a very sensitive and stable biosensor for some specific biological process.