Mucopolysaccharide having flocculating activity of protein and method for producing the same

A mucopolysaccharide having flocculating activity for protein which is inactivated by treatment with a protease or with periodic acid characterized by the following chemical and physical properties:

• 1. The ultraviolet spectrum of FIG. 1;
• 2. the infrared spectrum of FIG. 2;
• 3. containing carbon, hydrogen, oxygen and nitrogen;
• 4. Containing the following moieties:
• glutamic acid, tyrosine, valine, serine, leucine, aspartic acid, isoleucine, alanine, phenylalanine, proline, galactosamine, glucosamine, and 2-ketogluconic acid;
• 5. Having a molecular weight by the gel filtration method greater than 2 .times. 10.sup.5 ;
• 6. Exhibiting a positive Lowry reaction and a negative iodo starch reaction;
• 7. Being slightly soluble in water and soluble in dilute aqueous acid or alkali;
• and
• 8. Exhibiting a viscosity of 400 C.P. in 1.0% solution in ammonium chloride as measured with a B-type viscometer at 22.degree. C.