Carbohydrate utilization profiles were the most differentiative
phenotypic information for the isolates. In total, 22 different profiles
were obtained in our study (Table 1). Several studies documented
that S. thermophilus strains can yield varying carbohydrateutilization profiles (Gobbetti & Corsetti, 1999; Robinson, 2002;
Zirnstein & Hutkins, 1999). Utilization of glucose, lactose and
fructose by S. thermophilus isolates were found to be a common
characteristic in all studies, while mannose, galactose, sucrose,
maltose, melibiose, and raffinose utilizations were giving variable
profiles. Therefore, the isolates that utilize glucose, lactose and
fructose, but variable for the rest of the carbohydrates indicated
above were phenotypically identified as S. thermophilus. According
to this reference criterion, 7 of the 66 isolates were assigned as
S. thermophilus. The remaining isolates were assigned as atypical
(Table 1), and the species name could not be assigned based on
phenotypes.
Carbohydrate utilization profiles were the most differentiativephenotypic information for the isolates. In total, 22 different profileswere obtained in our study (Table 1). Several studies documentedthat S. thermophilus strains can yield varying carbohydrateutilization profiles (Gobbetti & Corsetti, 1999; Robinson, 2002;Zirnstein & Hutkins, 1999). Utilization of glucose, lactose andfructose by S. thermophilus isolates were found to be a commoncharacteristic in all studies, while mannose, galactose, sucrose,maltose, melibiose, and raffinose utilizations were giving variableprofiles. Therefore, the isolates that utilize glucose, lactose andfructose, but variable for the rest of the carbohydrates indicatedabove were phenotypically identified as S. thermophilus. Accordingto this reference criterion, 7 of the 66 isolates were assigned asS. thermophilus. The remaining isolates were assigned as atypical(Table 1), and the species name could not be assigned based onphenotypes.
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