期刊
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
卷 401, 期 8, 页码 2631-2638出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-011-5336-1
关键词
Enzyme immobilization; His(6)-OPH; Sol-gel; Organophosphate detection; Bio-sensing layer
资金
- Slovenian Research Agency (ARRS) for Young researchers [1000-08-310045]
- international Slovenia-Russia Cooperation in Science [BI-RU/10-11-017]
In this work, we report on the development of a bio-sensing film for the detection of organophosphorous compounds using sol-gel technology. A novel sol-gel immobilization method employing tetraethoxysilane/3-glycidoxypropyltrimethoxysilane/water hybrid material was developed and used to immobilize the hexahistidine-tagged organophosphorous hydrolase enzyme (His(6)-OPH). Bio-sensing layers with encapsulated His(6)-OPH of various structures (water/silane, precursor ratios) have been prepared. The optimal (P = 5:1, R = 188) bio-sensing layers retained 90% of the initial enzyme activity. Furthermore, the bio-sensing layer prepared by this method was able to maintain its activity at or above 80% of its initial activity for 2 weeks. The bio-hybrid film also showed excellent reusability and improved activity at neutral pH in comparison to the same enzyme in solution.
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