Titanium dioxide-based optical sensors for detecting milk adulteration

Авторы: Гриценко М.М.Назарова Е.А., Кривошапкин П.В., Кривошапкина Е.Ф.


Hydrogen peroxide (H2O2) and starch are common adulterants in milk. H2O2 is a powerful antimicrobial agent and starch is used to increase the viscosity and nutritional value of diluted milk. Adulterating milk with H2O2 and starch can cause serious health problems; therefore, it is important to detect them, even at very low concentrations. Titanium dioxide (TiO2) is a promising indicator and can be used to create sensors that can quantitatively identify these impurities. The principle of the sensor is based on the colour reaction between H2O2 and TiO2 nanoparticles to form peroxotitanic acid. Nanosized TiO2 was synthesized and investigated by various physicochemical methods, such as DLS, XRD, HRTEM, and N2 sorption analysis. The TiO2-based sensors presented in this work are easily scalable and can detect trace amounts of H2O2 (from 50 ppm) and starch (from 250 ppm) in milk. In addition, the selectivity to other common adulterants and reproducibility of the sensors (RSD = 5–7 %) were evaluated. The proposed sensor includes the development of an electronic device based on the Arduino hardware platform to take accurate automatic measurements.

DOI: 10.1016/j.jfca.2023.105335

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