Abstract

In the food industry, one of the most used preservatives in dairy producers is hydrogen peroxide. However, because high concentrations of hydrogen peroxide are harmful to health, many countries have limited or prohibited the use of this preservative. Due to those as mentioned above, this paper reports the development of a screen-printed carbon electrode (SPE) modified with copper (II) 1-(3-bromobenzyl)-5-methyl-1H-1,2,3-triazole-4-carboxylate [Cu(bmtc)2(H2O)] and was used as an electrochemical sensor of hydrogen peroxide in commercial milk. The material was characterised by crystal X-ray and cyclic voltammetry. On the other hand, analytical parameters such as reproducibility (2.7%), repeatability (2.6%), LOD (5.8×10−7mol L−1), selectivity (physiological substances) and stability were evaluated. The utility of the sensor [Cu(bmtc)2(H2O)]/SPE to analyse pasteurised milk contaminated with hydrogen peroxide, demonstrating a high level of recoveries (98.4 and 108.0%).