Abstract:
The invention provides Streptococcus thermophilus mutants, such as DSM22933, which have improved texturizing properties. The strains have: (i) a mutation in the branched chain amino acid transport ATP-binding protein LivG (TC 3.A.1.4.1) gene; (ii) a mutation in the ABC transporter permease protein gene; and/or (iii) a mutation in the peptide deformylase protein gene. The invention, furthermore, relates to compositions, such as a starter culture, comprising one or more of these mutants, to fermented products made using these mutants and to the use of the mutants and compositions of the invention.
Abstract:
Process for producing an ambient storage food product comprising providing a food product with a pH of between 3.4 and 4.4, subjecting the food product to a heat treatment to obtain a heat treated food product, adding aseptically to the heat treated food product one or more of ambient storage lactic acid bacteria strains to obtain an ambient storage food product, and storing the ambient storage food product at ambient temperature for a period of time, wherein the ambient storage lactic acid bacteria strain is selected from the group consisting of strains, (i) wherein the strain is capable of retaining viability at the end of 150 days at a temperature of 25#C, and (ii) wherein the pH at most decreases 0.8 units during the storage period, and (iii) wherein the strain is selected from the group consisting of Lactobacillus paracasei, Lactobacillus rhamnosus, Lactobacillus fermentum and Lactobacillus delbrueckii subsp. bulgaricus, and mutants and variants thereof.
Abstract:
The present invention relates to the field of dairy technology, in particular it relates to a method for assessing rheological properties of acidified milk gels (milk gels), including determination of shear stress, gel firmness and water-holding capacity. The method can be used to determine rheological properties of acidified milk, e.g. yoghurt and fresh cheese, in a fast and reliable way. The present invention also relates to a method of screening for microbial cultures resulting in fermented milk with desired rheological properties. By using an automated microtiter-plate pipetting station equipped with a pressure sensor inside the air displacement barrel of each pipette, it is possible to monitor real-time changes in pressure, when aspirating and dispensing milk gels, and then correlate the pressure versus time data obtained with milk gel rheological properties such as shear stress, gel firmness and water-holding capacity.