TITLE:
Influence of Different Sterilization Conditions on the Growth and Exopolysaccharide of Streptococcus thermophilus and Co-Cultivation with Lactobacillus delbrueckii subsp. bulgaricus OLL1073R-1
AUTHORS:
Junko Nishimura, Seiya Makino, Katsunori Kimura, Emiko Isogai, Tadao Saito
KEYWORDS:
Streptococcus thermophilus, Lactobacillus delbrueckii subsp. bulgaricus, Sterilization, Formic Acid, Exopolysaccharide
JOURNAL NAME:
Advances in Microbiology,
Vol.5 No.11,
October
29,
2015
ABSTRACT: The sterilization conditions between experiment and dairy industrial
level are different and concern about influence on product’s qualities. In this
study, the fermentation properties of Streptococcus thermophilus, alone and in
combination with Lactobacillus delbrueckii subsp. bulgaricus, were evaluated in skim milk that had been subjected to
distinct sterilization conditions. Growth, organic acid generation, and EPS
production were determined using pasteurized or autoclaved milk. When S. thermophilus was cultivated in pasteurized skim milk, the growth was strain-dependent. On
the other hand, growth of S. thermophilus was accelerated in
autoclaved milk. Exocellular polysaccharide (EPS) production by L. bulgaricus was not affected by the combination of S. thermophilus strains. Thus, we
observed that yogurt fermented by L. bulgaricus was minimally affected by the
combination of S. thermophilus strains; growth of L. bulgaricus was maintained under the constant environment. These results should facilitate
the development of fermented milk produced from L. bulgaricus in the
dairy industry.