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Related Concept Videos

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A fluorescence microscope uses fluorescent chromophores called fluorochromes, which can absorb energy from a light source and then emit this energy as visible light. Fluorochromes include naturally fluorescent substances (such as chlorophylls) and fluorescent stains that are added to the specimen to create contrast. Dyes such as Texas red and FITC are examples of fluorochromes. Other examples include the nucleic acid dyes 4’,6’-diamidino-2-phenylindole (DAPI), and acridine orange.
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Related Experiment Video

Updated: Aug 25, 2025

Multiplexed Fluorescent Microarray for Human Salivary Protein Analysis Using Polymer Microspheres and Fiber-optic Bundles
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Microsphere amplified fluorescence and its application in sensing.

Shuhui Si1, Tsuguhiro Kaneko2, Lingrui Xu1

  • 1Key Laboratory of Smart Drug Delivery, Ministry of Education, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai, 201203, China.

Biosensors & Bioelectronics
|October 15, 2022
PubMed
Summary

This study introduces a novel microsphere method for significantly enhancing fluorescence detection sensitivity. This technique achieves over 2600x improvement, enabling highly sensitive detection of biomolecules like human IgA.

Keywords:
Asymmetrical transmissionFluorescence enhancementFluoroimmunoassayMicrosphere amplified fluorescenceSensitive biosensing

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Area of Science:

  • Optics and Photonics
  • Biotechnology
  • Analytical Chemistry

Background:

  • Far-field fluorescence amplification is crucial for sensitive detection of large biomolecules but has been largely overlooked.
  • Existing methods, like electromagnetic field (EM) induced amplification on metallic surfaces, have limitations.
  • A new approach is needed to effectively amplify weak fluorescence signals.

Purpose of the Study:

  • To develop a novel microsphere-based strategy for efficient fluorescence amplification.
  • To enhance the sensitivity of fluorescence detection for biomolecules.
  • To demonstrate the practical application of this method in sensitive assays.

Main Methods:

  • Utilized a microsphere (hundreds of micrometers) to create a local dielectric environment for fluorophores.
  • Engineered the microsphere to confine fluorescence emission by controlling reflection and refraction.
  • Employed laser-induced fluorescence (LIF) for detection and fluoroimmunoassay for biomolecule analysis.

Main Results:

  • Achieved approximately 2600 times improved sensitivity in detecting fluorescent resorufin compared to standard solutions.
  • Demonstrated a limit of detection (LOD) of 3.25 fM for human IgA using the microsphere method.
  • Successfully confined and amplified fluorescence emission within the microsphere.

Conclusions:

  • The proposed microsphere-amplified fluorescence offers a powerful strategy for sensitive fluorescence sensing.
  • This method significantly boosts detection sensitivity, overcoming limitations of previous techniques.
  • Microsphere-amplified fluorescence holds great potential for advanced diagnostic and analytical applications.