A nanoporous MgO based nonenzymatic electrochemical sensor for rapid screening of hydrogen peroxide in milk

Abstract

In this work, a nonenzymatic electrochemical sensor based on nanoporous magnesium oxide (MgO) was developed for the rapid screening of hydrogen peroxide (H₂O₂) in milk. The nanoporous MgO, which was synthesized by a novel one-pot reaction process at low temperature, showed a large specific surface area and was favorable for constructing biosensors. Based on the nanoporous MgO, a nano-sensor for H₂O₂ was developed. The sensor exhibited extremely high electrocatalytic activity toward the oxidation of H₂O₂ with a detection limit of 3.3 μM and a wide linear range from 0.05 to 0.2 and 0.2 to 10 mM. The averaged recovery was determined to be from 94.3% to 119% for spiked milk samples. The proposed method is ideally suited for the fast screening of H₂O₂ misuse in milk at low cost.