Titre :
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Shape, molecular weight distribution and viscosity of amylopectin in dilute solution
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Auteurs :
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C. Durrani ;
A. Donald
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Type de document :
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article/chapitre/communication
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Année de publication :
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2000
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Format :
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p. 207-217
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Langues:
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= Anglais
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Catégories :
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PHYSIQUE ETAT DE LA MATIERE
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Mots-clés:
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VISCOSITE
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Résumé :
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This paper presents results on the properties of amylopectin in solution using a variety of physical techniques. High-pressure liquid chromatography-multiple angle laser light scattering was used as a direct means to determine not only the number-average and weight-average molecular weights of a series of five amylopectin samples, but also their molecular weight distributions. Small angle X-ray scattering using synchrotron radiation revealed strong evidence to suggest that amylopectin is a manifestly non-spherical macromolecule in aqueous solution or dimethyl sulphoxide. Shear rate-dependent viscosity measurements showed that aqueous amylopectin solutions behave as Newtonian liquids up to a high concentration, with very Little evidence for shear thinning at high shear rates. Viscosity data for different concentrations and two different molecular weights were successfully plotted in a reduced form to obtain a master plot, from which estimates for the polymer overlap concentration, c*, were obtained.
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Source :
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Carbohydrate Polymers, vol.41
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