Molecular weight and intrinsic viscosity of konjac gluco-mannan.

For the purpose of making clear the macromolecular chemical properties of konjac gluco-mannan, the light scattering and viscosity measurements were carried out for the aqueous solutions of the partially methylated derivatives, and following results were obtained: 1) The weight-average molecular weight, Mw, and the root mean square of radius of gyration, 1/2 were 100×104_??_120×104 and 1100_??_1300 Å, respectively. 2) The versus Mw relationship was represented by the equation of =4.20×10-1•Mw1.08, and this fact suggested a random coil as a molecular form in the solution. 3) The intrinsic viscosity, [η], versus Mw relationship was represented by the equation of [η]=6.37×10-4•Mw0.74, which was considered to be useful for the purpose of estimating the molecular weight of konjac gluco-mannan by viscometric method.