A sensor for the detection and measurement of an analyte in a biofluid. The sensor includes two enzymes. One type of sensor measures the concentration of hydrogen peroxide using a thermostable peroxidase enzyme that is immobilized in a redox hydrogel to form a sensing layer on a working electrode. This sensor also includes a hydrogen peroxide-generating second enzyme which is insulated from the redox hydrogel and electrode. This second enzyme generates hydrogen peroxide in response to the presence of an analyte or analyte-generated compound. The second enzyme may be insulated from the electrode by placement of an electrically insulating layer between the sensing layer and the second enzyme layer.
Alternatively, the second enzyme is immobilized in an inorganic polymeric matrix, preferably made using a sol-gel polymerization process. Such matrices include those made of silica. Often, the second enzyme is stabilized by immobilization in a sol-gel. Further stabilization of polyelectrolytic enzymes can be obtained by immobilizing the enzyme with a polyelectrolytic polymer in the sol-gel matrix.
一种用于检测和测量
生物流体中分析物的传感器。传感器包括两种酶。一种传感器使用固定在氧化还原
水凝胶中的可恒温
过氧化物酶来测量
过氧化氢的浓度,从而在工作电极上形成感应层。这种传感器还包括一种产生
过氧化氢的第二种酶,它与氧化还原
水凝胶和电极绝缘。第二种酶会根据分析物或分析物产生的化合物的存在生成
过氧化氢。第二种酶可以通过在传感层和第二种酶层之间放置电绝缘层而与电极绝缘。
或者,将第二种酶固定在无机聚合物基质中,最好采用溶胶-凝胶聚合工艺。这类基质包括由
二氧化硅制成的基质。通常,第二种酶是通过固定在溶胶-凝胶中来稳定的。通过在溶胶-凝胶基质中用聚电解聚合物固定酶,可以进一步稳定聚电解酶。