【原著】 ホウ酸イオン担持型陰イオン交換膜における糖輸送の律速段階

抄録

Facilitated transport of sugar across an anion-exchange membrane fixed with borate ions was investigated, and it was found that the following three factors affected the flux of sugar: the glucose concentration in the source phase, borate ion concentration in the receiving phase, and linear velocity of the receiving phase of borate ion solution. In low glucose concentration regime, the flux of glucose was dependent on the concentration in the source phase. In high glucose concentration regime, the flux was dependent not on the glucose concentration but on the borate ion concentration in the receiving phase, which shows the rate-limiting step to be desorption from the membrane. When pure water was used as the receiving phase, the flux of glucose was independent on both the linear velocity of the source phase and the receiving phase, which shows the rate-limiting step to be diffusion. These findings indicate that the rate-limiting step of this system can be changed by the experimental conditions. The flux of glucose increased by about six times as the temperature was increased from 7 °C to 45 °C. Depending on temperature, the monosaccharides were separated from disaccharides and glycerol with high selectivity.