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  • 1
    Electronic Resource
    Electronic Resource
    Comparison of the thickening properties of four Lactobacillus delbrueckii subsp. bulgaricus strains and physicochemical characterization of their exopolysaccharides (2003)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 221 (2003), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: It is now well established that physicochemical properties of exopolysaccharides (EPS) can vary between strains of a given species and according to growth conditions. The EPS production of four strains of Lactobacillus bulgaricus was monitored during growth in milk and in a chemically defined media. All strains, including the non-ropy one, produced EPS. The monosaccharide composition, molar mass (Mw), and intrinsic viscosity of these EPS were determined and compared. Further characterization using high-performance size-exclusion chromatography revealed the presence of two fractions in all EPS: one fraction exhibited a high Mw and a high intrinsic viscosity while the other had a low Mw and a low intrinsic viscosity. Strikingly, the EPS synthesized by the non-ropy strain was mainly composed of the low-Mw fraction while for the ropy strains, the fraction of high Mw varied between 43 and 90%. According to our results, we propose that the ratio between the high-Mw and low-Mw fractions is critical for the texturing properties of L. bulgaricus EPS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0378-1097(03)00214-3
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Exocellular polysaccharides produced by lactic acid bacteria (1990)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 87 (1990), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The production of homopolysaccharides (dextrans, mutans) and heteropolysaccharides by lactic acid bacteria, their chemical composition, their structure and their synthesis are outlined. Mutans streptococci, which include Streptococcus mutans and S. sobrinus produce soluble and insoluble α-glucans. The latter may contain as much as 90%α-1–3 linkages and possess a marked ability to promote adherence to the smooth tooth surface causing dental plaque. Dextrans produced by Leuconostoc mesenteroides are high molecular weight α-glucans having 1–6, 1–4 and 1–3 linkages, varying from slightly to highly branched; 1–6 linkages are predominant. Emphasis is put on exopolysaccharide producing thermophilic and mesophilic lactic acid bacteria, which are important in the dairy industry. The produced polymers play a key role in the rheological behaviour and the texture of fermented milks. One of the main problems in this field is the transitory nature of the thickening trait. This instability is not yet completely understood. Controversial results exist on the sugar composition of the slime produced, but galactose and glucose have always been identified with galactose predominating in most cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1990.tb04883.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Isolation and characterization of exocellular polysaccharide produced byLactobacillus bulgaricus (1986)
    Springer
    Biotechnology letters 8 (1986), S. 625-628 
    Details
    ISSN: 1573-6776
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Lactobacillus bulgaricus strains grown on skim milk produce a viscosifying exocellular watersoluble heteropolysaccharide composed of galactose, glucose and rhamnose in an approximately molar ratio of 4:1:1. The molecular weight is approximately 500.000.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01025968
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Exocellular polysaccharide production byStreptococcus thermophilus (1988)
    Springer
    Biotechnology letters 10 (1988), S. 255-260 
    Details
    ISSN: 1573-6776
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Streptococcus thermophilus strains grown on skim milk produce exocellular polysaccharide, essentially composed of galactose and glucose. Small amounts of xylose, arabinose, rhamnose and mannose are identified also. A relationship exists between viscosity of the culture medium and the amount of polymer produced. However, the thickness producing trait in the strains studied is highly unstable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01024415
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    Paper (German National Licenses)
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