Sorption of glucose by an anion-exchange membrane in the borate form. Stability of the complexes and the facilitated transport of glucose

摘要

The reaction of glucose with the borate ion has been studied in an anion exchange membrane. Two complexes, BL~- and BL_2~-, form in the membrane, and their corresponding stability coefficients β_1~* and β_2~* have been determined. The results have revealed that the BL~- complex is much more stable in the membrane than BL_2~-, and the stability coefficient β_1~* varies as a function of the relative proportions of the borate ion and the BL~- complex. The facilitated transport of glucose was performed through an anion exchange membrane by using the borate ion as carrier; the content of the latter was fixed by the concentration of boric acid in solution. The permeance of the membrane was measured in two cases. In the first case, the boric acid concentration was fixed and the concentration of glucose varied. In the second case, the glucose concentration was fixed and the influence of boric acid concentration was examined.