Ion Binding on Polyuronatf4s—-alginate and Pectin
نویسنده
چکیده
The influence of both the structure and the conformation of polyuronates and the linear charge density of these macromolecules upon the interaction of some divalent cations with their carboxyl groups is discussed. Several presumed mechanisms of cation binding to polyuronates have been mentioned and evaluated from our cited experimental data: determination of activity coefficients of Ca2 and Sr2 countenons in solutions of oligoand polyuronates, examination of circular dichroism of these substances and ultracentrifugation. In this way it is shown that, in addition to the linear charge density, the conformation of macromolecules and the intermolecular binding of divalent cations determine the bond strength of cations to polyuronates and the selectivity in ion exchange reactions on these natural ion exchangers. In addition, the ion exchange properties of crosslinked pectate, the affinity chromatography of pectolytic enzymes on this insoluble support and its biodegradability are presented.
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