The counts of viable LAB at the end of the fermentation
are important for comsumers, so the counts of the viable
microorganisms including S. thermophilus and L. bulgaricus
detected immediately after fermentation for 4 h were
investigated (Fig. 1C). With increasing the amount of
ginger juice, the counts of viable LAB appeared a clear
downward trend and significant differences (p<0.05)
between various groups, indicating that some substances in
ginger juice samples could inhibit the growth of LAB to a
certain extent and that the inhibition of bacterial growth
was content dependent. According to previous studies
(8,9), the antibacterial substances may be inferred as
gingerols in the ginger juice. Food regulations in the most
countries require yogurt to contain viable LAB of starter
origin at concentrations of at least 107 CFU/mL at the time
of consumption (4), and the counts of LAB at the end of
the fermentation ranged between 2.97×108 and 1.285×109
CFU/mL in the present study, which even largely exceeded
107 CFU/mL. Of course, the counts of viable bacteria
during refrigerated storage need to be investigated further.
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