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In this work, the performance of
dehydratation-desalcoholization system based on an electronic nose coupled to
gas chromatography was tested. The system was used for monitoring the volatile
compounds produced during a lactic fermentation with a heterofermentative
bacteria (Lactobacillus fermentum Ogi E1). The monitoring was carried out
with dehydratation and desalcoholization or dehydratation only, on the basis of
low ethanol concentration produced by this bacteria. In the first case,
fermentation head-space analyses showed low signals from each gas sensor, then
the principal components analyses (PCA) resulted confused. However with the
only dehydratation system, the electronic nose was able to detect some volatile
compounds during bioprocess. The PCA showed a single distribution, permitting
to conclude that principal component 1 represented the ethanol concentration.
The system is appropriate to monitor some parameters during the fermentations
process as ethanol, lactate and biomass concentration.