DWS microrheology of a linear polysaccharide.
Diffusing wave spectroscopy has been used to measure the rheological behavior of pullulan (M(w) = 1 x 10(5)) aqueous solutions up to concentration of 40 g/dL. It was found that these solutions were mainly viscous, with the loss modulus G'' higher than the elastic modulus G'. The plot of the specific viscosity eta(sp) as a function of pullulan concentration showed two critical concentrations c = 4 g/dL and c = 15 g/dL. For c < c, eta( sp) approximately c(1.25+/-0.05); for c < c < c, eta( sp) approximately c(2+/-0.05); and for c > c, eta( sp) approximately c(4.5+/-0.5). These results are in very good agreement with those reported in the literature.
Hemar
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Institute of Food, Nutrition and Human Health, Massey University, Private Bag 11 222, Palmerston North, New Zealand. yacine.hemar@fonterra.com
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D001704:Biopolymers / Q000737:chemistry; D004058:Diffusion; D004548:Elasticity; D005936:Glucans / Q000737:chemistry; D046911:Macromolecular Substances / Q000737:chemistry; D008970:Molecular Weight; D011134:Polysaccharides / Q000737:chemistry*; D012212:Rheology / Q000379:methods*; D013053:Spectrophotometry / Q000379:methods; D013816:Thermodynamics; D013997:Time Factors; D014783:Viscosity
D001704:Biopolymers; D005936:Glucans; D046911:Macromolecular Substances; D011134:Polysaccharides; C009109:pullulan