Polymerizable silicon-containing compounds are polymerized or further polymerized in dispersed form to form membranes when cured or polymerized in a dispersed layer upon removal of the continuous phase during curing to provide a membrane having unexpectedly good oxygen and glucose-permeability without allowing the passage of electrode-sensitive interferants therethrough.
The membranes also are permeable to cholesterol, uric acid, and lower alcohols, such as ethanol. The polymerizable silicon-containing compounds, after dispersion in a continuous phase, such as by including an emulsifier, can be cured in any known manner during removal of the continuous phase, such as by evaporation of water from a water-continuous phase silicon emulsion or dispersion. A glucose catalyst layer, such as glycose oxidase, can be bonded directly to an electrical signal-receiving surface, such as an electrode, and the membrane applied over the catalyst to form an electrochemical sensor having new and unexpected accuracy. Whole blood is applied directly onto the membrane, allowing passage of glucose and oxygen to the glucose oxidase layer while preventing passage of substantially all other electrode interferants present in whole blood. Since the membrane is whole blood compatible, at the conclusion of the measurement, the whole blood on the surface of the membrane may be rinsed or wiped off and the sensor is ready for measurement of another specimen.
将可聚合的含
硅化合物聚合或以分散形式进一步聚合,在固化时形成膜,或在固化过程中移除连续相时聚合成分散层,从而提供一种具有出乎意料的良好
氧气和
葡萄糖渗透性的膜,同时不允许电敏感干扰物通过。
这种膜还能透过
胆固醇、
尿酸和低级醇(如
乙醇)。可聚合的含
硅化合物在连续相中分散(如加入
乳化剂)后,可以在去除连续相时以任何已知的方式固化,如从
水-连续相
硅乳液或分散液中蒸发
水分。
葡萄糖催化剂层(如
葡萄糖氧化酶)可直接粘合到电信号接收表面(如电极)上,然后将膜覆盖在催化剂上,以形成一种电
化学传感器,其精度之高出乎意料。将全血直接涂在膜上,允许
葡萄糖和
氧气通过
葡萄糖氧化酶层,同时防止全血中存在的几乎所有其他电极干扰物通过。由于膜与全血兼容,测量结束后,可以冲洗或擦掉膜表面上的全血,传感器就可以进行另一种样本的测量了。