Hydrogen peroxide biosensor utilizing a hybrid nano-interface of iron oxide nanoparticles and carbon nanotubes to assess the quality of milk

A hybrid interface was developed using nano iron oxide and carbon nanotubes and this architecture offered an improved performance for the detection of hydrogen peroxide. Nano iron oxide was synthesized by a simple thermal co-precipitation technique and it was dispersed in nafionic solution. To this mixture added the catalase enzyme adsorbed multi-walled carbon nanotubes and this solution was used for the modification of the electrode. The morphology of the prepared nanocomposite was observed using FE-TEM and the electrochemical studies were carried out using cyclic voltammetry and amperometry. The linear range of the prepared amperometric sensor was found to be between 1.2 and 21.6 mu M with a quick response time of less than 1 s. The interference, reproducibility and stability studies were carried out with satisfactory results. The limit of detection and limit of quantification were found to be 3.7 nM and 12.2 nM respectively. With the convincing results obtained in terms of the performance of the biosensor, this platform was successfully upgraded for the determination of hydrogen peroxide in the presence of milk samples. (C) 2015 Elsevier B.V. All rights reserved.