Electronic nose as flexible tools to assess food quality and safety: should we trust them?

This paper presents three different applications of an Electronic Nose (EN) based on a metal oxide sensor array, in order to illustrate the broad spectrum of potential uses of the technique in food quality control. The following scenarios are considered: a) the screening of a typical error that may occur during the processing of tomato pulp which leads to sensory damage of the product, b) the detection of microbial contamination by Alicyclobacillus spp. affecting soft drinks and c) the proof of evidence of extra virgin olive oil fraudulent adulteration with hazelnut oil. In each case, the EN was able to identify the spoiled product by means of the alterations in the pattern of volatile compounds, reconstructed by principal component analysis of the sensor responses.