The
addition of 1.5% bile to the culture medium was not able to inhibit
L. lactis. Although the sensitivity of lactococci strains to bile salts is
reported in literature, this characteristic is strain dependent
(Begley, Gahan, & Hill, 2005), which may explain the variability in
results using this culture medium for different microorganisms. In
contrast, the addition of bile in MRS agar was able to inhibit the
yoghurt starter culture, thus being considered selective for
enumeration of L. acidophilus from these products (Table 3).