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Updated: Jul 23, 2026

OLIgo Mass Profiling (OLIMP) of Extracellular Polysaccharides
Published on: June 20, 2010
Viscoelastic properties of an exocellular polysaccharide produced by a Lactococcus lactis
1NIZO Food Research, P.O. Box 20, 6710 BA Ede, The Netherlands. tuinier@nizo.nl or r.tuinier@chem.uu.nl
Abstract:
The viscoelastic properties of a well-characterized exocellular polysaccharide (EPS) produced by the lactic acid bacterium Lactococcus lactis subsp. cremoris strain B40 were investigated. Dynamic rheological measurements were made as a function of frequency and EPS concentration. The bead-spring model of Rouse could reasonably describe the dynamic properties. Concentrated EPS solutions have a significant elasticity (G' > G") at high frequencies. The relatively high G' values at high concentrations and high frequencies are indicative of significant normal stress differences, and we put forward a hypothesis that suggests that these normal stresses may explain the contribution of EPSs to the ropy behavior of yogurts.
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