Steady shear flow behavior of sage seed gum affected by various salts and sugars: Time-independent properties.
The rheological properties of food hydrocolloids are remarkably influenced by the quality of solvent/cosolutes in a food system. In this work, the steady shear flow behavior of sage seed gum (SSG, 0.5% w/w) at the presence of different levels of salts (KCl & MgCl2, 0-100mM) and sugars (sucrose, lactose & glucose, 0-6% w/w) was studied. It was found that the rheological properties of SSG were affected by the type of sugars and salts and their concentrations as well. Synergistic interaction was observed between SSG and sugars which enhanced the viscosity of gum solutions, while salts addition diminished the viscosity. SSG solutions exhibited a shear thinning behavior at all conditions tested. Various time-independent rheological models were used to fit the shear stress-shear rate data, although the Herschel-Bulkley (R(2)=0.994-0.999) and Sisko (R(2)=0.995-0.999) models showed the best results to describe the flow behavior of SSG. In the presence of salts, the yield stress (τ0), consistency coefficient (k), and flow behavior index (n) values decreased. The k and τ0 values enhanced and the n value lowered in the presence of sugars. Divalent cations of Mg(2+) and sucrose roughly showed more effect on rheological parameters than others.
Department of Chemical Engineering, University of Bonab, PO Box 55517-61167, Bonab, Iran. Electronic address: a_yousefi@bonabu.ac.ir.
Ali R
AR
Yousefi
Department of Food Science and Technology, Maragheh Branch, Islamic Azad University, Maragheh, Iran.
Razieh
R
Eivazlou
Food Hydrocolloids Research Center, Department of Food Science and Technology, Ferdowsi University of Mashhad (FUM), PO Box 91775-1163, Mashhad, Iran.
Seyed M A
SM
Razavi
D002241:Carbohydrates / Q000494:pharmacology*; D053149:Plant Gums / Q000737:chemistry*; D012212:Rheology / Q000187:drug effects*; D012492:Salts / Q000494:pharmacology*; D027543:Salvia officinalis / Q000737:chemistry*; D012639:Seeds / Q000737:chemistry*; D033081:Shear Strength / Q000187:drug effects*; D012996:Solutions; D013997:Time Factors; D014783:Viscosity / Q000187:drug effects
D002241:Carbohydrates; D053149:Plant Gums; D012492:Salts; D012996:Solutions
Cosolute; Rheology; Sage seed gum