Ammonium addition inhibits arginine and alanine uptake, and
therefore, they inhibit its degradation to form urea (Henschke &
Ough, 1991). Changes in the nitrogen uptake pattern influence
the production of urea, which is the major precursor of the
carcinogen EC (Adams & van Vuuren, 2010). It is generally known
that ammonia addition to the fermenting juice would reduce potential
EC formation. However, Ough, Crowell, and Mooney (1988)
reported that excessive nitrogen additions may lead to the presence
of non-assimilated residual nitrogen at the end of fermentation,
therefore leading to EC accumulation in wine. Banana addition
could change the likelihood of EC formation due to excessive nitrogen
addition. In this study, the addition of DAP and banana to the
must increased EC formation. Therefore, it is important to know the
nitrogen content of musts and the nitrogen requirement for the
completion of fermentation in order to avoid excessive
supplementation.