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Related Concept Videos

Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.
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Total Internal Reflection Fluorescence Microscopy

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Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.
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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...

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Automated System for Single Molecule Fluorescence Measurements of Surface-immobilized Biomolecules
10:57

Automated System for Single Molecule Fluorescence Measurements of Surface-immobilized Biomolecules

Published on: November 2, 2009

Highly efficient optical detection of surface-generated fluorescence.

J Enderlein1, T Ruckstuhl, S Seeger

  • 1Institute of Analytical Chemistry, Chemo- und Biosensors, University of Regensburg, PF 10 10 42, D-93040 Regensburg, Germany.

Applied Optics
|February 29, 2008
PubMed
Summary
This summary is machine-generated.

This study introduces a novel optical system for highly efficient fluorescence detection of surface molecules. It collects light above and below the critical angle, improving sensitivity for ultrasensitive applications.

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Area of Science:

  • Optical Physics
  • Biophotonics
  • Analytical Chemistry

Background:

  • Ultrasensitive detection of surface-bound molecules is crucial for various scientific fields.
  • Conventional optical systems face limitations in collecting fluorescence, especially light emitted above the critical angle.
  • Surface-bound molecules present unique challenges for fluorescence detection due to limited emission angles.

Purpose of the Study:

  • To present a theoretical study of a new, highly efficient optical light collection system.
  • To design a system for ultrasensitive fluorescence detection of surface-bound molecules.
  • To overcome limitations of conventional systems in collecting fluorescence, particularly light above the critical angle.

Main Methods:

  • Theoretical modeling and simulation of a novel optical light collection system.
  • Utilizing a paraboloid glass segment as a fluorescence collection mirror.
  • Analyzing the system's ability to capture fluorescence emitted both below and above the critical angle.

Main Results:

  • The proposed system demonstrates highly efficient optical light collection for fluorescence detection.
  • It effectively collects fluorescence emitted above the critical angle, which is advantageous for surface-bound molecules.
  • The system enables confocal imaging, crucial for rejecting scattered light and enhancing detection specificity.

Conclusions:

  • The developed optical system offers superior performance for ultrasensitive fluorescence detection of surface-bound molecules.
  • Its ability to capture light above the critical angle significantly enhances collection efficiency.
  • The confocal imaging capability makes it suitable for detecting single or few molecules by minimizing background noise.