Effect of different carbon sources on production of EPS
There was a statistically significant (P < 0.05) difference in EPS
production among the different carbon sources after 30 h fermentation.
The EPS production reached up to 108 mg/L when sucrose
was used as the carbon source (Fig. 1). In order to evaluate the
effect of sucrose concentration on EPS production, a number of fermentation
experiments at 37 C for 30 h with various amount of
sucrose were carried out. The results showed that the amount of
EPS reached up to 120 mg/L when the concentration of sucrose
was 80 g/L (Fig. 2). However, EPS yield was decreased, when the
concentration of sucrose was higher than 80 g/L. Generally,
S. thermophilus lacks the ability to ferment a large number of