NEW PHOSPHORYLATED POLYSACCHARIDES, THEIR PRODUCTION AND USE THEREOF

PROBLEM TO BE SOLVED: To obtain the subject new polysaccharides, excellent in ionic interactions with a protein, useful as a stabilizer and deficient in galactose in the side chain by heating and hydrolyzing phosphorylated polysaccharides under acidic conditions. SOLUTION: The polysaccharides are represented by formula I [Glc is a glucose residue; Gal is a galactose residue; Rha is a rhamnose residue; numerals in the formula denote respective binding sites; (n) is the recurring unit]. Furthermore, the polysaccharides are obtained by heating, e.g. phosphorylated polysaccharides represented by formula II under acidic conditions, especially preferably heating the phosphorylated polysaccharides at 80-100 deg.C under acidic conditions in which an acid is added so as to provide about 0.5-2mM final concentration, liberating the galactose in the side chain, producing the objective polysaccharides and collecting the resultant polysaccharides.