Rheological properties of mesquite seed gum in steady and dynamic shear

B. Yoo, A. A. Figueiredo, M. A. Rao

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

The steady and dynamic shear rheological properties of mesquite seed gum (MSG) solutions were measured at various concentrations (0.4-2.0 g/100 mL). The intrinsic viscosity was 240.5 mL/g. The Cross flow model provided a better fit on the shear rateapparent viscosity data than the Carreau flow model. The coil overlap parameter, C[η], correlated well with the zero-shear rate specific viscosities (ηspo) The transition at the critical concentration (C*) occurred at a value of the coil overlap parameter C[η] = 2.7 close to that observed for other galactomannan gums. Storage (G′) and loss (G″) moduli increased with increase in frequency ω), while dynamic shear viscosity η*) decreased. G″ values showed elastic plateaus at high frequencies. The dynamic and steady-shear viscosities at several concentrations followed the empirical Cox-Merz rule.

Original languageEnglish
Pages (from-to)151-157
Number of pages7
JournalLWT
Volume27
Issue number2
DOIs
StatePublished - Apr 1994

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