Abstract
Growth conditions that support bacteriocin (thermophilin T) production by Streptococcus thermophilus ACA-DC 0040 were identified. Synthesis of thermophilin T occurred during primary metabolic growth, while its specific rate of synthesis seemed to be optimal at T = 30°C. Thermophilin T activity rapidly decreased in the stationary phase, especially at high growth temperature (i.e. T = 42°C). In media with high content of complex nitrogen sources, high amounts of bacteriocin were detected in the growth environment, while about an 8-fold increase of thermophilin T titer and a 2-fold increase of specific synthesis rate was achieved when a fed-batch fermentation mode was applied.
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Abbreviations
- α :
-
Specific bacteriocin production (AU g−1)
- AU:
-
Arbitrary units
- B :
-
Bacteriocin activity (titer) per volume of growth medium (MAU l−1)
- B max :
-
Maximum bacteriocin activity (MAU l−1)
- CNS:
-
Complex nitrogen source concentration (g l−1)
- LAB:
-
Lactic acid bacteria
- q B :
-
Specific bacteriocin production rate (h−1)
- r :
-
Specific growth rate (h−1)
- r max :
-
Maximum specific growth rate (h−1)
- r D :
-
Specific bacteriocin inactivation rate (h−1)
- x :
-
Biomass (cell dry mass) concentration (g l−1)
- x max :
-
Maximum biomass concentration (g l−1)
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Aktypis, A., Tychowski, M., Kalantzopoulos, G. et al. Studies on bacteriocin (thermophilin T) production by Streptococcus thermophilus ACA-DC 0040 in batch and fed-batch fermentation modes. Antonie van Leeuwenhoek 92, 207–220 (2007). https://doi.org/10.1007/s10482-007-9148-4
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DOI: https://doi.org/10.1007/s10482-007-9148-4