Structural characterization of a bioactive water-soluble heteropolysaccharide from Nostoc sphaeroids kütz.

A water soluble Nostoc sphaeroids kütz polysaccharide (NSKP) was extracted and purified by precipitating hot-water extract from Nostoc sphaeroids kütz with 40% (v/v) ethanol. The yield was 40.10% (w/w), and weight average molecular weight (M) was determined as 1.