Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Electrochemical Immunosensing of GOx-labeled CRP Antigen on Capture Antibody Monolayer Immobilized on Calixcrown-5 SAMs

  • Published : 2007.10.20
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Abstract

Insulating effects on Au electrode according to the thickness and density of coated materials are well-known. To do electrochemical immunoassay reproducibly the glod electrode would be coated with self-assembled monolayers and antobodies. To get reproducibility, the antobody monolayer should be packed at highest density so that the amount of immobilized antibody at defined area should be the same. The calix[4]crown-5 SAMs could provide the basis for the antibodies to be immobilized reproducibly and at highest density. But the insulating effect would be highest too. We proved that the compactly packed protein monolayers on SAMs inhibited the electron transfer by block the free shuttling of redox molecules. The inhibition was minimized by inserting redox molecules in between the proteins during immobilization process. In this paper, we demonstrated that the calix[4]crown-5 SAMs would provide the protein monolayers with highest density and new method to minimize the insulating effect by inserted redox molecules in between the compactly packed protein monolayers.

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