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Compact surface plasmon resonance imaging sensing system based on general optoelectronic components.

Wei Peng, Yun Liu, Peng Fang

    Optics Express
    |March 26, 2014
    PubMed
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    This study introduces a compact surface plasmon resonance imaging (SPRi) sensor using common optoelectronics. The system accurately measures refractive index changes and demonstrates potential for selective biomedical and biochemical monitoring.

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    Area of Science:

    • Optoelectronics
    • Biomedical Sensing
    • Surface Plasmon Resonance Imaging (SPRi)

    Background:

    • Surface plasmon resonance (SPR) is a powerful label-free technique for detecting molecular interactions.
    • Traditional SPR systems can be bulky and expensive, limiting their widespread application.
    • There is a need for compact, cost-effective SPR sensing platforms for various applications.

    Purpose of the Study:

    • To develop a simple, compact, and cost-effective surface plasmon resonance imaging (SPRi) sensing system.
    • To demonstrate the system's capability for refractive index (RI) measurement and selective biomolecular detection.
    • To explore its potential for multi-channel biochemical analysis.

    Main Methods:

    • Utilized an optical fiber-based SPR sensor as the core sensing element.
    • Employed a universal light-emitting diode (LED) as the light source.
    • Captured SPRi data using a standard web camera and processed images with custom Windows software.

    Main Results:

    • Established a linear relationship between relative light intensity and refractive index (RI) within the range of 1.3396 to 1.3645.
    • Successfully measured the specific binding between Concanavalin A (Con A) and Ribonuclease B (RNase B).
    • Demonstrated the SPRi system's potential for selective affinity monitoring in biomedical applications.

    Conclusions:

    • The developed SPRi system is compact and utilizes readily available optoelectronic components.
    • The system exhibits reliable performance for RI sensing and specific biomolecular interaction detection.
    • Further investigation could enable multi-channel biochemical measurements, expanding its utility.