Direct electrochemical immunoassay based on a silica nanoparticles/sol-gel composite architecture for encapsulation of immunoconjugate.

Abstract:

:A highly hydrophobic and non-toxic colloidal silica nanoparticle/polyvinyl butyral sol-gel composite membrane was prepared on a platinum wire electrode. With diphtheria-toxoid (D-Ag) as a model antigen and encapsulation of diphtheria antibody (D-Ab) in the composite architecture, this membrane could be used for reagentless electrochemical immunoassay. It displayed a porous and homogeneous composite architecture without the aggregation of the immobilized protein molecules. The formation of immunoconjugate by a simple one-step immunoreaction between D-Ag in sample solution and the immobilized D-Ab introduced the change in the potential. Under optimal conditions, the D-Ag analyte could be determined in the linear ranges from 10 to 800 ng ml(-1) with a relatively low detection limit of 2.3 ng ml(-1) at 3delta. The D-Ag immunosensor exhibited good precision, high sensitivity, acceptable stability, accuracy, and reproducibility. This composite membrane could be used efficiently for the entrapment of different biomarkers and clinical applications.

authors

Wang FC,Yuan R,Chai YQ

doi

10.1007/s00253-006-0353-2

subject

Has Abstract

pub_date

2006-10-01 00:00:00

pages

671-5

issue

4

eissn

0175-7598

issn

1432-0614

journal_volume

72

pub_type

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