Viscoelastic properties of an exocellular polysaccharide produced by a Lactococcus lactis

R. Tuinier, C.J. Oomen, P. Zoon, M.A. Cohen Stuart, C.G. de Kruijf

Research output: Contribution to journalArticleAcademicpeer-review

18 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)219-223
JournalBiomacromolecules
Volume1
DOIs
Publication statusPublished - 2000

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