Abstract
An ionic branched polysaccharide, isolated from the sap of the Chinese lac tree ( Rhus vernicifera), was separated into 10 fractions by isopropanol reprecipitation from an aqueous 0·1 m NaCl solution of 1 wt% polysaccharide. The molecular weights and solution properties were investigated by low angle laser light scattering, rapid static membrane osmometry and viscometry. The Mark-Houwink equations of the polysaccharide in aqueous 0·1 m NaCl at 30°C were established to be: { η} = 3·59 × 10 −2M 0·50 w and { η} = 2·15 × 10 −2M 0·59 n. The second virial coefficients A 2, unperturbed dimensions 〈h 2〉 0/M and expansion factors α η obtained suggested that the polysaccharide exists in aqueous solution as a dense random coil, in consequence of its highly branched structure. In addition, the differential molecular weight distribution curve of the polysaccharide obtained from the experimental data shows double peaks, which is in agreement with data in the literature.
Published Version
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