Sensing film selection of QCM odor sensor suitable for apple flavor discrimination

In the food, Leverage and cosmetic industry and so on, odor sensing systems instead of human sensory test are demanded. MB have developed odor sensing systems using QCM (quartz crystal microbalance) sensor array and pattern r ecognition method. Since the properties of the sensors depend on the gas so rption characteristics of the sensing films coated on them, the optimum fil ms according to target odors should Le selected. In this study, we tried to select sensing films appropriate for discrimination of slightly different apple flavors. The examples of typical apple flavors were prepared blending 9 compounds. The sensing films were extracted from various kinds of materi als such as lipid, stationary phase material of CC (gas chromatography) and cellulose. The selection method under the condition of tho small number of measurements was studied. We analyzed the data of steady-state sensor resp onses in terms of the Euclidean distance, and the: films appropriate for ap ple flavor discrimination were successfully selected.