Development of an electronic nose for determining the freshness of fish by the desorption constants of sensors

Abstract

An electronic nose (NE) reduced in size, based on commercial sensors array with a particular thermally stabilized chamber and an advanced processing algorithm was developed. In this work using a heater system that controls the temperature of the sensors chamber, it was possible to study the desorption process on SnO2 sensor array. Data signal of sensors applying a two exponential decay functions were analyzed in order to determine the desorption constants. These constants were used to measure the fish freshness using the PCA algorithm. This is a first approach using this method that shows the ability of the EN to detect interruptions during the cold storage.