The pH of the medium remained constant during the
experiments, varying from 6.0 at the beginning to 5.6, on
average n (Fig. 2). The pH has also been described as a factor
that strongly interferes in the fermentative processes.
However, according to Diez and Yokoya (1996b) molasses
exhibits a buffering effect. This regulatory action depends
of molasses chemical composition. The main stabilizer
compounds of the pH are weak acids and amino acids that
act in the acid range, mainly between pH 3.0 and 5.0, or
phosphates, whose buffering effects occur in the range of
6.0 and 7.0. Falca˜o de Moraes et al. (1981) noted that
Z. mobilis possesses hugh tolerance at pH variations from
3.5 to 7.5, and its optimum at a range of 5.0–7.0. Buzato
(1984), observed no substantial oscillations on the alco-
The pH of the medium remained constant during theexperiments, varying from 6.0 at the beginning to 5.6, onaverage n (Fig. 2). The pH has also been described as a factorthat strongly interferes in the fermentative processes.However, according to Diez and Yokoya (1996b) molassesexhibits a buffering effect. This regulatory action dependsof molasses chemical composition. The main stabilizercompounds of the pH are weak acids and amino acids thatact in the acid range, mainly between pH 3.0 and 5.0, orphosphates, whose buffering effects occur in the range of6.0 and 7.0. Falca˜o de Moraes et al. (1981) noted thatZ. mobilis possesses hugh tolerance at pH variations from3.5 to 7.5, and its optimum at a range of 5.0–7.0. Buzato(1984), observed no substantial oscillations on the alco-
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