抄録
In order to make an effective use of closed-loop artificial pancreas, it is necessary to monitor the glucose content in blood continuously. Mostly an enzyme electrode has been used for measuring the glucose content in blood because of its high selectivity and sensitivity. The glucose is diffused within the immobilized enzyme accompanied with chemical reaction and the process of glucose transport in detail in the immobilized enzyme has not been revealed yet. Particularly the optimal design of enzyme electrode requires the quantitative information of permeability of glucose and H2O2 in the enzyme membrane. In this study the effective diffusivities of glucose and H2O2 in the immobilized enzyme membrane were measured to find the design feature of implanted glucose electrode for long term use. Albumin-linked glucose oxidase sandwiched by two sheets of Polyacrylonitrile (PAN) membrane was attached to the tip of the platinum anode. The transfer rate of glucose transformed into H2O2 in the membrane was determined by the amount of H2O2 detected in the electrode. Thereby the effective diffusivity of glucose and H2O2 in the immobilized membrane was determined. Based on the feature of mass transport process obtained in this study, the design of various type of electrode such as an implantable one becomes feasible.
