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Strains were incubated at 37°C in 10% skim milk supplemented with 0.1% yeast extract.

The purified strains were stored at -20°C in sterile reconstituted skim milk (12.5% W/V) supplemented with 15% glycerol. Customer Service, © 2020  Merck KGaA, Darmstadt, Germany and/or its affiliates. Yoghurt

Lactose and sucrose utilization by Streptoccus thermophilus. The aim of this study was to characterize isolates of thermophilic lactic acid bacteria from traditional fermented milk and to study some of their important technological properties. Z. It remains unclear at this moment how L. bulgaricus and S. thermophilus grow and survive on plants, and if these bacteria are transferred from other materials by insects such as ants (Markoff, 1925). Strains 2FM, 20FM and 285N presented interesting biotechnological profiles and may influence the quality of fermented milk if they are used in association as starters in yoghurt manufacture. Control and Enhancement of Flavor in Cheese. Lait, 75: 463-742.CrossRefDirect LinkCourtin, P. and F. Rul, 2004. thermophilus/Lb. for their fermentative ability as their heath and nutritional benefits (Schmidt Beuchat The relevance of exopolysaccharides to the rheological properties in milk fermented with ropy strains of lactic acid bacteria. Food Microbiol., 110: 52-61.Direct LinkHarigon, W.F. F.C. This mixture was stored in ice at 4°C overnight. We also thank all the members of the research team of the Laboratory of Microbial Biochemistry, Alexandria University (Egypt) for their excellent helpful technical assistance. Textural properties of yogurt made with encapsulated non-ropy lactic cultures. In fact, the positive and negative areas beneath the curve measure the resistance encountered by the plunger withdrawal, which indicates the flowing characteristic of the fermented milk influenced by its consistency or viscosity. For cocci strains¸ growth on SF broth medium and in the presence of 6.5% NaCl were also considered (Harigon and Mac Cane, 1976; Holt et al., 1994). In the present investigation, thermophilic lactic acid bacteria strains isolated from traditional fermented milk were identified and some of their biotechnological relevant properties were examined in order to be selected as starters in the manufacture of yoghurt.

In this study, we report the first evidence that the urease activity of S. thermophilus increases the intracellular pH of L. delbrueckii in the absence of carbon source.

All these strains were described as highly acidifying since the variation of pH of 0.4 units were achieved after within 4 h. As shown in Fig. 2). In: Identification Methods for Microbiologists, Skinner, F.A. 4, for microbiology, NutriSelect, Peptone Water, phosphate-buffered for microbiology, NutriSelect, Peptone Water for microbiology, NutriSelect, Plate Count Agar, Vegitone for microbiology, NutriSelect, Plate Count Agar for microbiology, NutriSelect, Plate Count Skim Milk Agar for microbiology, Plate-Count-Agar (Agar 15 g/L) for microbiology, NutriSelect, Thioglycolate Broth with Resazurine for microbiology, NutriSelect, Thioglycollate Medium with K Agar for microbiology, Thiol broth for microbiology, NutriSelect, Todd Hewitt broth for microbiology, NutriSelect, Tryptic Soy Agar, Vegitone for microbiology, NutriSelect, Tryptic Soy Agar for microbiology, NutriSelect, Tryptic Soy Broth No.

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