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Related Experiment Video

Updated: Mar 26, 2026

Laser-Induced Fluorescence Emission L.I.F.E. as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats
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A handheld laser-induced fluorescence detector for multiple applications.

Xiao-Xia Fang1, Han-Yang Li1, Pan Fang1

  • 1Institute of Microanalytical Systems, Department of Chemistry, Zhejiang University, Hangzhou 310058, China.

Talanta
|February 4, 2016
PubMed
Summary
This summary is machine-generated.

We developed a compact, handheld laser-induced fluorescence (LIF) detector using a 450 nm laser diode. This portable, low-cost instrument demonstrates high sensitivity and broad applicability for various analytical applications.

Keywords:
Capillary electrophoresisChip scannerFlow cytometryHandheld instrumentLaser induced fluorescence detection

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Area of Science:

  • Analytical Chemistry
  • Biophotonics
  • Instrumentation

Background:

  • Miniaturization of analytical instruments is crucial for portable and field applications.
  • Laser-induced fluorescence (LIF) detection offers high sensitivity but often requires bulky equipment.
  • The use of 450 nm laser diodes in miniaturized LIF detectors is underexplored.

Purpose of the Study:

  • To develop a compact, handheld LIF detector utilizing a 450 nm laser diode.
  • To investigate optimal optical configurations for miniaturization and performance with a 450 nm laser.
  • To evaluate the detector's performance and applicability in various analytical scenarios.

Main Methods:

  • Designed and integrated a quasi-confocal optical system with a 450 nm laser diode and photomultiplier tube.
  • Systematically investigated lens, filter, and pinhole configurations, considering water's Raman effect at 450 nm.
  • Developed integrated electronic modules for signal processing and display.

Main Results:

  • A compact (9.1 × 6.2 × 4.1 cm³) handheld LIF detector was successfully constructed for approximately $2000.
  • Achieved a detection limit of 0.42 nM for sodium fluorescein (S/N=3).
  • Demonstrated applicability in capillary electrophoresis, flow cytometry, and droplet array chip analysis.

Conclusions:

  • The developed compact LIF detector is a cost-effective and versatile tool for on-line and portable analysis.
  • Its performance suggests suitability for integration into flow analysis, field testing, and biosensor applications.
  • This work highlights the potential of 450 nm laser diodes in miniaturized LIF detection systems.