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, <S2>1/2, were l00-× 104-120×104and 1100- 1300 Å, respectively. 2) The <*S2> versus Mw relationship was represented by the equation of <S2>=4.20×10-1-Mw1.08, and this fact suggested a random coil as a molecular form in the solution. 3) The intrinsic viscosity,[ᵑ], versus Mw relationship was represented by the equation of [ᵑ]=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. © 1978 Taylor & Francis Group, LLC.