On-Chip Electronic Nose For Wine Tasting: A Digital Microfluidic Approach

This paper presents the integration of a metal oxide gas sensor into an open digital microfluidic (DMF) system for rapid identification of different types of wines. The effect of water-cross sensitivity of a gas sensor was eliminated using a hydrophobic porous micro-channel, which provides selective detection of the aromas of a wine droplet manipulated on a DMF platform. Seven different kinds of wines are tested and successfully recognized. The temporal responses of the sensor to a droplet of each of these wines are reported. Two features are extracted from the transient response and mapped into a 2-D plot to show the segregation of different wines.