Cited by 117Probiotics and Fermented FoodsPolysaccharides Composition and ApplicationsProteins in Food Systems

Exopolysaccharide Production and Texture-Promoting Abilities of Mixed-Strain Starter Cultures in Yogurt Production

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Bouzar, Fatouma, Cerning, Jutta, Desmazeaud, Michel·1997·Journal of Dairy Science

Abstract

An exopolysaccharide-producing strain of Lactobacillus delbrueckii ssp.bulgaricus (CNRZ 1187) and two colonial white and pink variants were grown in skim milk in association with a strain of Streptococcus thermophilus (CNRZ 389) that did not produce exopolysaccharide to assess the effects of associative growth on exopolysaccharide formation.After 10 h of fermentation, viscosity (380 mPa.s) was highest with the parental strain CNRZ 1187 in the mixed-strain starter, the lowest (220 mPa.s) with the mixed-strain starter containing the white variant and S. thermophilus CNRZ 389, and intermediate (290 mPa.s) with the mixed-strain starter containing the pink variant and S. thermophilus CNRZ 389.Viscosities of the milks with exopolysaccharide-producing strains decreased after mechanical stirring, but values remained higher (170 to 230 mPa.s) than those obtained with nonproducing strains (70 mPa.s).The mixed-strain starter composed of the white colonies of L. delbrueckii spp.bulgaricus and S. thermophilus produced the highest amount of exopolysaccharide (240 mg/L), and the mixed-strain starter containing the parental strain CNRZ 1187 produced the lowest amount (110 mg/L) of exopolysaccharide.The exopolysaccharide production from the mixed-strain starter containing the white and pink L. delbrueckii ssp.bulgaricus colonies began earlier and was higher after 3 h of fermentation than that from the starter containing the parental L. delbrueckii ssp.bulgaricus strain.Production of exopolysaccharide from the latter approached the maximum in the beginning of the stationary growth phase; production from the mixed-strain starter with the pink and white variants continued during the early stationary growth phase.The exopolysaccharide contained mainly galactose with small amounts of glucose and rhamnose.The monosaccharide composition of the exopolysaccharide changed during the exponen-tial growth phase ( 6 h ) and remained stable thereafter.

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  • In complex media with high protein content and at acidic pH, purification and quantification of EPS requires isolation of EPS from a protein network where EPS and bacterial cells are trapped or conjugated with protein.

    “In complex media with a high protein content (e.g., skim milk), and at acidic pH, purification and quantification of EPS requires the isolation of EPS from a protein network where EPS and bacterial cells are trapped or conjugated with the protein [53,96].”

    From Lactic Acid Bacteria Exopolysaccharides Producers: A Sustainable Tool for Functional Foods (2021) · cites this paper as [96]

    The EPS Isolation and Characterization section (page not provided) hydrolyzes caseins before isolating and quantifying EPS. The Introduction reports that EPS attaches to bacterial cells and interacts with caseins, while the Discussion describes acid-dependent milk-protein coagulation. The paper does not explicitly say that bacterial cells are trapped or conjugated with the protein network, or establish this isolation requirement for complex media generally. (LLM, conf=0.84)

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Research works printed but not linked: 2

  1. Cowie, O. N. 1993. Factors influencing texture modifying characteristics of selected strains of lactic acid bacteria. Ph.D. Diss., Oxford Brookes Univ., United Kingdom.
  2. Tamime, A. Y., and R. K. Robinson. 1985. Microbiology of yogurt starter cultures. Page 276 in Yogurt, Science and Tech- nology. Pergamon Press, Oxford, United Kingdom.

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Authors
Bouzar, F., Cerning, J., & Desmazeaud, M.
Affiliations
Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement (FR)
Venue
Journal of Dairy Science
Published
1997-10
Volume
80
Issue
10
Pages
2310-2317
ISSN
0022-0302 (ISSN-L)
OpenAlex
W2087856822
Cited by
117
References
33
Citations by year
2025: 3 · 2023: 1 · 2022: 7 · 2021: 7 · 2020: 6 · 2019: 4 · 2018: 4 · 2017: 3 · 2016: 3 · 2015: 5 · 2014: 4 · 2013: 4
FWCI
7.92
Type
journal article
Language
en
Open access
Locations
Journal of Dairy Science (publishedVersion)
Funders
  • Institut national de la recherche scientifique
  • Institut National de la Recherche Agronomique
Topics
  • Life Sciences › Agricultural and Biological Sciences › Food Science › Probiotics and Fermented Foods
  • Life Sciences › Agricultural and Biological Sciences › Food Science › Polysaccharides Composition and Applications
  • Life Sciences › Agricultural and Biological Sciences › Food Science › Proteins in Food Systems
Keywords
exopolysaccharide production, yogurt, Lactobacillus bulgaricus, Streptococcus thermophilus, viscosity, texture, monosaccharide composition, galactose, growth phase, skim milk fermentation

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