Role of Swelling Pressure on the Distribution Coefficient of Maltooligosaccharide in a Cation-exchange Resin

Abstract

The distribution coefficients of maltooligosaccharides with a degree of polymerization of 1 to 7 in cation-exchange resins (Amberlites HFS-471X and CG-60) with various crosslinkages and of counterion forms were used to estimate the swelling pressure of the resins. The distribution coefficient of glucose in the resin with 6% divinylbenzene of various ionic forms was measured by varying the ionic strength of the eluent. Although the resins shrank with increasing ionic strength, the distribution coefficient became larger. These results suggest that the swelling pressure of an ion-exchange resin plays an important role in the distribution of a non-electrolyte such as maltooligosaccharide to the resin. A simple method to estimate the swelling pressure is also described.