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  • Title: Polyelectrolyte and rheological studies on the polysaccharide welan.
    Author: Campana S, Andrade C, Milas M, Rinaudo M.
    Journal: Int J Biol Macromol; 1990 Dec; 12(6):379-84. PubMed ID: 2088496.
    Abstract:
    This paper investigates the polyelectrolyte behaviour of welan in aqueous solution. From conductivity and activity measurements it is demonstrated that a double-helical conformation is adopted irrespective of pH and ionic strength. The intrinsic pK of its carboxylic groups is found to be abnormally low (pKO = 2.2) and no conformational transition was observed during neutralization. The viscometric behaviour was studied as a function of degree of neutralization, polymer concentration, shear rate and ionic strength. The linear relation [eta] = f(Cs-1/2) allows the determination of B, the stiffness parameter from Smidsrød, whose value characterizes a very stiff molecule.
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