Characterization of different brands used in a typical argentinean beverage mate by means of an e-nose

A qualitative analysis of different kinds of green leaves brands employed
in a popular Argentinean beverage—mate—was performed with an electronic
nose (EN) based on quartz microbalance sensors. We employed a LibraNose
from Technobiochip, which contains eight sensors. Two types of ‘odours’ are
analysed for each sample corresponding to short- and long-term periods
after the opening of the package. Principal component analysis (PCA) is
applied to the sensor responses and it is possible to distinguish between
different brands through their locus in the plane defined by the first two
PCA components. Preliminary results confirm the usefulness of this EN for
classification and future quality control purposes.