Abstract
Nucleic acid sensor has been fabricated via immobilization of single standard
calf thymus deoxyribose nucleic acid (ssCT-DNA) onto chitosan (CH)-iron oxide (Fe
3O
4) nanoparticles based hybrid nanobiocomposite film deposited onto indium-tin-oxide (ITO) coated glass for pyrethroids [cypermehtirn (CM) and permethrin (PM)] detection. The ssCT-DNA immobilized onto CH-Fe
3O
4 nanocomposite/ITO electrode has been characterized using scanning electron microscopy (SEM), UV–visible, Fourier transform infrared (FTIR) spectroscopy, electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV) techniques. This disposable ssCT-DNA/CH-Fe
3O
4 nanobiocomposite/ITO bioelectrode is stable for about two months under refrigerated conditions and can detect CM (0.0025–2
ppm) and PM (1–300
ppm) using DPV technique within 25
s and 40
s, respectively.