Modelling the survival of starter lactic acid bacteria and Bifidobacterium bifidum in single and simultaneous cultures |
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Authors: | Altieri Clelia Bevilacqua Antonio D'Amato Daniela Nobile Matteo Alessandro Del Sinigaglia Milena |
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Affiliation: | Department of Food Science, Faculty of Agricultural Science, Foggia University, Via Napoli 25, 71100 Foggia, Italy. |
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Abstract: | The inactivation kinetics at 4 degrees C of Bifidobacterium bifidum, Lactobacillus delbrueckii subsp. bulgaricus and Streptococcus thermophilus, cultured alone or consociated in a laboratory medium (modified MRS broth), were modelled through the Weibull model and a second-order polynomial equation. The initial cell number of S. thermophilus and L. delbrueckii subsp. bulgaricus was approximately 6-7log (CFU/ml); the viability loss after 30 days of storage was 2.87 and 1.99log (CFU/l) for L. delbruckii subsp. bulgaricus and S. thermophilus, cultured alone, respectively; whereas the consociation of lactobacilli and streptococci with bifidobacteria reduced viability loss during storage (0.28 and 0.54log CFU/l for lactobacilli and streptococci, respectively). Finally, the consociation of lactobacilli and streptococci with B. bifidum improved their oxygen uptake. |
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Keywords: | Modelling Lactic acid bacteria Bifidobacterium bifidum Probiotic survival |
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