Quantum dots based platform for application to fish freshness biosensor

Laser ablated tin oxide quantum dots (SnO2 QDs ∼1–5 nm) uniformly dispersed in a colloidal solution have been electrophoretically deposited onto indium–tin-oxide (ITO) glass for immobilization of xanthine oxidase (XOx) for fabrication of fish freshness biosensor. The results of electrochemical response studies conducted on XOx/SnO2 QDs/ITO bio-electrode reveal higher sensitivity (0.5148 μA/μM cm2), lower Km value (0.022 μM), faster response time (10 s), and wide linear range of 1–400 μM with regression co-efficient as 0.999, higher charge transfer rate constant 1.63 s−1.