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Issue 16, 2014
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Disposable surface plasmon resonance aptasensor with membrane-based sample handling design for quantitative interferon-gamma detection

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Abstract

ELISA and ELISPOT methods are utilized for interferon-gamma (IFN-γ) release assays (IGRAs) to detect the IFN-γ secreted by T lymphocytes. However, the multi-step protocols of the assays are still performed with laboratory instruments and operated by well-trained people. Here, we report a membrane-based microfluidic device integrated with a surface plasmon resonance (SPR) sensor to realize an easy-to-use and cost effective multi-step quantitative analysis. To conduct the SPR measurements, we utilized a membrane-based SPR sensing device in which a rayon membrane was located 300 μm under the absorbent pad. The basic equation covering this type of transport is based on Darcy's law. Furthermore, the concentration of streptavidin delivered from a sucrose-treated glass pad placed alongside the rayon membrane was controlled in a narrow range (0.81 μM ± 6%). Finally, the unbound molecules were removed by a washing buffer that was pre-packed in the reservoir of the chip. Using a bi-functional, hairpin-shaped aptamer as the sensing probe, we specifically detected the IFN-γ and amplified the signal by binding the streptavidin. A high correlation coefficient (R2 = 0.995) was obtained, in the range from 0.01 to 100 nM. A detection limit of 10 pM was achieved within 30 min. Thus, the SPR assay protocols for IFN-γ detection could be performed using this simple device without an additional pumping system.

Graphical abstract: Disposable surface plasmon resonance aptasensor with membrane-based sample handling design for quantitative interferon-gamma detection

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Supplementary files

Article information


Submitted
27 Feb 2014
Accepted
29 Apr 2014
First published
16 Jun 2014

Lab Chip, 2014,14, 2968-2977
Article type
Paper
Author version available

Disposable surface plasmon resonance aptasensor with membrane-based sample handling design for quantitative interferon-gamma detection

T. Chuang, C. Chang, Y. Chu-Su, S. Wei, X. Zhao, P. Hsueh and C. Lin, Lab Chip, 2014, 14, 2968
DOI: 10.1039/C4LC00249K

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