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Related Concept Videos

Microbial Biosensors01:17

Microbial Biosensors

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Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...
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A Label-free Technique for the Spatio-temporal Imaging of Single Cell Secretions
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Sub-micrometric reflectometry for localized label-free biosensing.

R Casquel, J A Soler, M Holgado

    Optics Express
    |June 16, 2015
    PubMed
    Summary
    This summary is machine-generated.

    We developed a novel optical technique to analyze sub-micrometric areas using light reflectivity. This method enables high-resolution characterization of biosensing surfaces for immunoassays, achieving a comparable Limit of Detection to standard spectrometry.

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    Area of Science:

    • Optics and Photonics
    • Biotechnology
    • Materials Science

    Background:

    • Characterizing sub-micrometric areas is crucial for advanced applications like biosensing.
    • Existing techniques may lack the resolution or specificity for analyzing micro-scale interactions.
    • Developing novel optical methods is essential for improving sensitivity and spatial resolution in bio-assays.

    Purpose of the Study:

    • To present a new optical technique for characterizing sub-micrometric areas based on light reflectivity.
    • To fabricate and evaluate Bio Photonic Sensing Cells (BICELLs) for biosensing applications.
    • To compare the performance of the developed technique with existing methods like FT-VIS-NIR spectrometry.

    Main Methods:

    • Utilized an optical technique measuring light reflectivity as a function of angle of incidence for s and p polarizations.
    • Characterized circular areas with diameters around 600 nm with high angular resolution (0.1°).
    • Fabricated Bio Photonic Sensing Cells (BICELLs) using SU-8 polymer interferometers on silicon substrates and performed indirect immunoassays.

    Main Results:

    • Successfully characterized sub-micrometric areas with high resolution and obtained polarization-dependent spectra in a single measurement.
    • Demonstrated the efficacy of BICELLs for biosensing through indirect immunoassay.
    • Achieved a Limit of Detection (LoD) comparable to high-resolution spectrometry for immunoassays on sensing surfaces.

    Conclusions:

    • The presented optical technique offers a powerful tool for analyzing sub-micrometric domains with high resolution.
    • BICELLs integrated with this technique provide a sensitive platform for biosensing and immunoassays.
    • This approach enables localized analysis of bio-reactions on sensing surfaces, complementing traditional spectrometry.