The number average molecular weight Mn

second virial coefficient A2 and intrinsic viscosity [η] were measured for unfractionated and fractionated samples of a lacquer polysaccharide from Vietnam by dynamic membrane osmometry and vlscosimetry. The aqueous 0.5MKCl/10% cadoxen was chosen as a solvent

which not only rapidly dissolved the polysaccharide to form a particularly stable solution

but also did not destroy the regenerated cellulose membrane used for osmometry. The Mark-Houwink equation and A2~ Mn relationship for the polysaccharide in aqueous 0.5M KCl/10% cadoxen at 30℃ were found respectively to be [n]=1.44×10-2M0.56n and A2=0.142Mn-0.48.This implies that branched polysaccharide in the aqueous solution takes a fairly compact coil conformation.