Article ID Journal Published Year Pages File Type
869629 Biosensors and Bioelectronics 2007 7 Pages PDF
Abstract

A label free optical biosensor based on a free-space Young interferometer configuration is presented. Commercial planar Ta2 O5 waveguides are used as sensing elements and allow the investigation of surface bound bioreactions like immunoreactions or biological affinity systems. Design criteria are discussed and a detailed characterization of the sensor performance is presented. The developed interferometer yields an effective refractive index resolution of 9×10−99×10−9, corresponding to a surface coverage of ≈≈ 13 fg/mm2. The performance of the system is characterized by two different affinity systems: the antibody–antigen complex protein G–immunoglobulin G is used as a model system for monitoring reaction kinetics. Further measurements on a silanized surface show the formation of a streptavidin monolayer on a biotinylated surface.

Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
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