Because of the stress conditions that occur during the sourdoughs fermentation (i.e. energy starvation and acidic
medium), a major problem for the deliberate use of microorganisms is their limited resistance to this harmful
environment [26]. De Angelis et al [27] and Rollán et al [28] demonstrated that arginine catabolism through the arginine
deiminase pathway (ADI) enhanced the cell growth (via the ATP production) and increase the tolerance to acid
environmental stress (through ammonium production).The triggering factor for the ADI pathway in Lact. reuteri CRL
1098 would be the depletion of energy source rather than the pH attained by cultures at the stationary phase, whereas in
Lact. sanfranciscis CB1, the presence of carbon source and low concentration of both arginine and oxygen are the
conditions that promote the arginine catabolism throughout this pathway.