The results above indicated that low pH negatively affected the
growth of bacteria. Many researchers also agree that pH influences
bacterial vitality. The acid tolerance of bacteria is attributed to the
presence of a constant gradient between extracellular and intracellular
pH. When the internal pH reaches a threshold value,
cellular functions are inhibited and the cells die. In simulated
gastric juice at pH 2.0, a strain of Lactobacillus rhamnosus, declined
in population by 6.6 log10 CFU/ml after 90 min. Under the same
conditions, almost 100% of another strain of L. paracasei was found
to be killed after only 30 min of exposure (Corcoran, Stanton,
Fitzgerald, & Ross, 2005).
In conclusion, control of pH might eliminate the growth inhibition
by acids which were produced during bacterial development.
The results above indicated that low pH negatively affected the
growth of bacteria. Many researchers also agree that pH influences
bacterial vitality. The acid tolerance of bacteria is attributed to the
presence of a constant gradient between extracellular and intracellular
pH. When the internal pH reaches a threshold value,
cellular functions are inhibited and the cells die. In simulated
gastric juice at pH 2.0, a strain of Lactobacillus rhamnosus, declined
in population by 6.6 log10 CFU/ml after 90 min. Under the same
conditions, almost 100% of another strain of L. paracasei was found
to be killed after only 30 min of exposure (Corcoran, Stanton,
Fitzgerald, & Ross, 2005).
In conclusion, control of pH might eliminate the growth inhibition
by acids which were produced during bacterial development.
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