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A Surface Plasmon Resonance Probe Without Optical Fibers as a Portable Sensing Device by Takuo Akimoto; Syunsuke Wada; Isao Karube is a Chemistry article available to read on EtoBox.

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A surface plasmon resonance (SPR) sensor integrating a small sensor probe, a laser emission diode, a photo detector, and a polarizer was developed as a portable sensing device. The sensor probe was made with a glass cylinder, 50mm long and 1.5mm in diameter, that was connected directly to a beam splitter without optical fibers. The SPR spectrum obtained with this probe system showed a 10% reflectivity minimum at 690 nm. Shifts of the SPR spectrum induced by refractive index (RI) changes in the sample were measured by detecting the reflection light intensity at 670 nm. When the sensitivity was compared using a BIAcore SPR instrument, the lowest sensor response of 1mV observed with the SPR probe system coincided with 1.4x10(-6) of the RI changes. The RI resolution of the SPR probe was estimated with experimentally evaluated noise on the signal, and, consequently, it was concluded that the RI resolution was 1.2x10(-5). Moreover, immunoreaction was demonstrated with adsorbed bovine serum albumin (BSA) and anti-BSA antibody as an analyte. As a result, 50 ng mL(-1) of the lower detection limit was estimated.

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Author

Takuo Akimoto; Syunsuke Wada; Isao Karube

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0003-2670)

Published

2008

Language

EN

Field

Chemistry (Physical Sciences)