Sol-gel derived ceramic-carbon enzyme electrodes: Glucose oxidase as a test case

被引:19
作者
Sampath, S
Pankratov, I
Gun, J
Lev, O
机构
[1] Division of Environmental Sciences, School of Applied Science, Hebrew University of Jerusalem, Jerusalem
关键词
sol-gel; biosensor; electrode; glucose oxidase;
D O I
10.1007/BF00401892
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Several types of amperometric biosensors comprised of immobilized glucose oxidase in chemically-modified ceramic-carbon matrices are compared. The electrodes are comprised of several building blocks each performing a specific function. Glucose oxidase is used to catalyze the bio-oxidation of glucose; carbon powder imparts conductivity and favorable electrochemical characteristics; the Ormosil network provides rigidity and porosity; and the organic modification of the Ormosil imparts controlled surface polarity. Additionally, hydrophilic chemical modifiers are incorporated in order to control the size of the wetted, electroactive layer; high dispersion of inert metal catalysts is used to enhance hydrogen peroxide oxidation and redox mediators may be co-immobilized when oxygen independent response is desirable. The electrodes can be prepared either in the form of thick supported film, useful for disposable electrodes or as bulk-modified, disk shape electrodes, which can be used as renewable surface electrodes.
引用
收藏
页码:123 / 128
页数:6
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