Impedimetric bio-electronic tongue based on silver nanoparticles for the analysis of milk

Abstract

The purpose of this work was to create an impedimetric electronic tongue with an array of interdigitated microelectrodes sensors for application in the dairy industry. In order to develop an array of sensors with greater sensitivity and selectivity, sensors were modified with silver nanoparticles and enzymes were linked to the sensor's surface. The responses of the sensors modified with silver nanoparticles and enzymes showed greater sensitivities toward compounds of interest in milk. The principal component analysis (PCA) showed that the bioelectronic tongue was able to discriminate between the standard solutions analysed (glucose, galactose, lactose, urea and triglycerides) with 79% variance in their first two components. In addition, the study of milk samples confirmed the high cross-selectivity of the system.