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  • Title: Solution conformation and properties of the galactoglucan from Rhizobium meliloti strain YE-2(S1).
    Author: Cesàro A, Tomasi G, Gamini A, Vidotto S, Navarini L.
    Journal: Carbohydr Res; 1992 Jul 02; 231():117-35. PubMed ID: 1394308.
    Abstract:
    The physicochemical solution properties of the galactoglucan excreted by Rhizobium meliloti strain YE-2(S1) have been investigated by capillary viscometry, potentiometric titration, isothermal mixing microcalorimetry, and circular dichroism. Potentiometric and chiro-optical data, as a function of the degree of ionisation, indicate the absence of a co-operative conformational transition. Solution properties, as a function of ionic strength and temperature, suggest that the galactoglucan adopts a disordered conformation characterised by moderate flexibility. Polyelectrolyte theory is used to fit the enthalpy of dilution data with a suitable linear charge-density parameter. Conformational calculations and chain modelling, using molecular mechanics, give an unperturbed characteristic ratio, (C infinity) of 20, which was smaller than that estimated from intrinsic-viscosity and molecular-weight data for an expanded-coil chain model.
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