ChitosanCellulose Sulfate Acetate Complexation
in Acetic Acid Solutions

T. N. Shybaila^a, T. A. Savitskaya^a, T. A. Kislyakova^a, A. I. Albulov^b, and D. D. Grinshpan^c

^a Department of Chemistry, Belarussian State University, ul. Leningradskaya 14, Minsk, 220030 Belarus

^b ZAO Bioprogress, Shchelkovo, Moscow oblast, 141142 Russia

^c Research Institute of Physicochemical Problems, ul. Leningradskaya 14, Minsk, 220030 Belarus

Received August 8, 2007

Abstract—Colloidal and optical properties of dispersions of chitosan–cellulose sulfate acetate interpolyelec-
trolyte complexes resultant from mixing dilute solutions of the polymers in acetic acid and in acetic acid–based
buffer mixtures are investigated. It is established that, in acetic acid, an insoluble complex is formed whose
composition corresponds to the unit ratio [chitosan] : [cellulose sulfate acetate] = 1 : 1.5, mol/mol. Particle size
and concentration are independent of the order of mixing of the solutions of the polymers. In buffer solvents,
the particle size is larger and the particle concentration is lower than those in acetic acid. Excess chitosan causes
the dissolution of the complex. The addition of low-molecular-weight electrolytes to ionic strengths of 0.2–0.3
also promotes the dissolution of the interpolyelectrolyte complex. The complex becomes completely soluble at
ionic strengths of 1.5–2.0.

DOI: 10.1134/S1061933X08050165

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