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Related Experiment Video

Updated: Feb 1, 2026

Autofluorescence Imaging to Evaluate Cellular Metabolism
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Macroscale fluorescence imaging against autofluorescence under ambient light.

Ruikang Zhang1, Raja Chouket1, Marie-Aude Plamont1

  • 1PASTEUR, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 75005 Paris, France.

Light, Science & Applications
|December 5, 2018
PubMed
Summary

This study introduces a simple fluorescence macroscope using Speed OPIOM (Out of Phase Imaging after Optical Modulation) to overcome spectral interferences. The method significantly enhances fluorescence imaging sensitivity and signal-to-noise ratio for biological samples.

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Area of Science:

  • Biophotonics
  • Microscopy
  • Optical Imaging

Background:

  • Macroscale fluorescence imaging is vital for biological samples but faces challenges from spectral interferences like ambient light and autofluorescence.
  • Existing methods struggle to selectively image specific fluorophores against background noise.

Purpose of the Study:

  • To develop and evaluate a simple, inexpensive fluorescence macroscope system.
  • To assess the performance of Speed OPIOM (Out of Phase Imaging after Optical Modulation) for selective fluorescence imaging.
  • To improve signal-to-noise ratio and sensitivity in challenging imaging conditions.

Main Methods:

  • Construction of a simple and inexpensive fluorescence macroscope.
  • Application of Speed OPIOM, a reference-free dynamic contrast protocol.
  • Tuning illumination intensity and radial frequency to Speed OPIOM resonance.
  • Utilizing a phase-sensitive detection scheme for noise rejection.

Main Results:

  • Enhanced fluorescence detection sensitivity by 50x and signal-to-noise ratio by 10x in blot assays compared to constant illumination.
  • Successfully imaged spectrally similar fluorescent bacteria in autofluorescent growth media.
  • Discriminated fluorescent labels from background in plant leaves even under intense incident light.

Conclusions:

  • The developed fluorescence macroscope with Speed OPIOM effectively overcomes spectral interferences.
  • This approach significantly improves sensitivity and signal-to-noise ratio for various biological imaging applications.
  • The system shows promise for diverse applications from laboratory assays to outdoor observations.