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Selective detection of antibodies in microstructured polymer optical fibers

Jesper B. Jensen, Poul E. Hoiby, Grigoriy Emiliyanov, Ole Bang, Lars H. Pedersen, and Anders Bjarklev

Open Access Open Access

Abstract

We demonstrate selective detection of fluorophore labeled antibodies from minute samples probed by a sensor layer of complementary biomolecules immobilized inside the air holes of microstructured Polymer Optical Fiber (mPOF). The fiber core is defined by a ring of 6 air holes and a simple procedure was applied to selectively capture either α-streptavidin or α-CRP antibodies inside these air holes. A sensitive and easy-to-use fluorescence method was used for the optical detection. Our results show that mPOF based biosensors can provide reliable and selective antibody detection in ultra small sample volumes.

©2005 Optical Society of America

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Figures (3)
Fig 1.
Fig 1. Micrograph showing the end-facet of the mPOF used in the biosensor experiments. The outer diameter is 300μm and the air hole diameter is 60μm. The bridges supporting the core broke during the cleaving of the fiber. The fracture only extends a few millimeters into the fiber.

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Fig 2.
Fig 2. Schematic presentation of the capture processes utilized in the selective detection of the antibodies. a:) α-streptavidin-Cy3 is captured by streptavidin molecules directly immobilized on the PMMA surface while the mis-matching α-CRP-Cy3 molecules are washed out, b:) α-CRP-Cy3 molecules are captured by the α-CRP/CRP sandwich, while the mis-matching α-streptavidin-Cy3 molecules do not bind and are washed out.

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Fig 3.
Fig 3. Fluorescence measurements demonstrating the excellent selectivity of the capture process in a fiber activated with a:) a streptavidin-layer, and b:) a α-CRP/CRP sandwich.

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