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Effect of oxygen on batch yogurt cultures

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Abstract

A yogurt culture (Streptococcus thermophilus 15HA + Lactobacillus delbrueckii subsp. bulgaricus 2-11) was studied in conditions of aerobic batch fermentation (10–40% dissolved oxygen in milk). The growth and acidification of S. thermophilus 15HA were stimulated at 20% oxygen concentration and the lactic acid process in a mixed culture was shortened by 1 h (2.5 h for the aerobic culture and 3.5 h for the anaerobic mixed culture). Streptococcus thermophilus 15HA oxygen tolerance was significantly impaired at oxygen concentrations in the milk above 30%. Though S. thermophilus 15HA was able to overcome to some extent the impact of high oxygen concentration (40%), the lactic acid produced was insufficient to coagulate the milk casein (4.0 g lactic acid l−1 in the mixed culture and 3.8 g lactic acid l−1 in the pure culture). A dramatic decrease in the viable cell count of L. delbrueckii subsp. bulgaricus 2-11 in the pure and mixed cultures was recorded at 30% dissolved oxygen.

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Beshkova, D., Simova, E., Frengova, G. et al. Effect of oxygen on batch yogurt cultures. World Journal of Microbiology and Biotechnology 18, 365–369 (2002). https://doi.org/10.1023/A:1015288705502

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  • DOI: https://doi.org/10.1023/A:1015288705502

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