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J Mol Recognit. 1996 Sep-Dec;9(5-6):485-7.

Immobilization of streptavidin for immunosensors on nanostructured surfaces.

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Paul Scherrer Institut, Villigen, Switzerland.


A modular immunosensor device based on silicon technology with electrochemical detection is presented. The sensor surface is functionalized with the antigen estradiol using the streptavidin-biotin system. The immobilized antigen is recognized by ferrocene-labeled antibody molecules in a competitive assay format. The ferrocene redox centers can be detected electrochemically. In order to facilitate the electron transfer, a gold layer structured in nanometer dimensions is used as an electrode. The functionalized silicon chip will be integrated into a micromachined fluid transport system. The resulting immunosensor device for estradiol represents a prototype allowing easy adaptation to other biotinylated analytes since the immobilized streptavidin serves as a universal anchor.

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