Electronic nose (E-nose) technology is frequently attempted
to
simulate the human olfactory system to recognize complex odors. Metal
oxide semiconductors (MOSs) are E-noses’ most popular sensor
materials. However, these sensor responses to different scents were
poorly understood. This study investigated the characteristic responses
of sensors to volatile compounds in a MOS-based E-nose platform, using
baijiu as an evaluation system. The results showed that the sensor
array had distinctive responses for different volatile compounds,
and the response intensities varied depending on the sensors and the
volatile compounds. Some sensors had dose–response relationships
in a specific concentration range. Among all the volatiles investigated
in this study, fatty acid esters had the greatest contribution to
the overall sensor response of baijiu. Different aroma types of Chinese
baijiu and different brands of strong aroma-type baijiu were successfully
classified using the E-nose. This study provided an understanding
of detailed MOS sensor response with volatile compounds, which could
be further applied to improve the E-nose technology and its practical
application in food and beverages.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.