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Total Internal Reflection Fluorescence Microscopy01:05

Total Internal Reflection Fluorescence Microscopy

Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
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Biomolecular Detection employing the Interferometric Reflectance Imaging Sensor (IRIS)
11:04

Biomolecular Detection employing the Interferometric Reflectance Imaging Sensor (IRIS)

Published on: May 3, 2011

Biomolecular detection employing the Interferometric Reflectance Imaging Sensor (IRIS).

Carlos A Lopez1, George G Daaboul, Sunmin Ahn

  • 1Department of Electrical and Computer Engineering, Boston University, USA.

Journal of Visualized Experiments : Jove
|May 19, 2011
PubMed
Summary

This study introduces the Interferometric Reflectance Imaging Sensor (IRIS), a label-free optical biosensor for sensitive biomolecular interaction detection. IRIS offers high throughput and real-time capabilities, overcoming limitations of traditional labeled assays.

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Area of Science:

  • Biotechnology and Biomedical Engineering
  • Analytical Chemistry
  • Molecular Diagnostics

Background:

  • Label-based assays (e.g., ELISA, PCR) are common for biomolecular interaction measurement but have drawbacks.
  • Labeling processes increase cost, reduce reagent usability, and can affect molecular functionality and real-time analysis.
  • There is a need for sensitive, label-free methods for detecting biomolecular interactions in various applications.

Purpose of the Study:

  • To present the application of a novel label-free optical biosensor, the Interferometric Reflectance Imaging Sensor (IRIS).
  • To demonstrate IRIS's utility for detecting various biological materials including proteins, DNA, and pathogens.
  • To showcase the IRIS system's performance from array preparation to endpoint analysis using a model system.

Main Methods:

  • Utilized the Interferometric Reflectance Imaging Sensor (IRIS), a label-free optical biosensor.
  • Employed microarray studies for high-throughput detection of biomolecular interactions.
  • Demonstrated the system using the capture of anti-human serum albumin (HSA) antibodies on HSA-spotted substrates.

Main Results:

  • The IRIS system exhibited high sensitivity, precision, and reproducibility in detecting biomolecular interactions.
  • IRIS offers multiplex imaging, real-time and endpoint measurement capabilities, and high-throughput attributes.
  • The platform is user-friendly, cost-effective, and compatible with standard surface chemistry techniques.

Conclusions:

  • The Interferometric Reflectance Imaging Sensor (IRIS) provides a powerful label-free alternative for sensitive biomolecular detection.
  • IRIS overcomes key limitations of traditional labeled assays, enabling efficient and accurate analysis.
  • The system is suitable for diverse applications in basic research, diagnostics, and monitoring.