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Related Experiment Video

Updated: Dec 25, 2025

Author Spotlight: High-Quality Quantum Dot Nanobeads for Sensitive Fluorescent Lateral Flow Immunoassays
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Quantum Dots-Based Lateral Flow Test Strip for Glutathione Detection.

Zhaohui Li1, Juanzu Liu2, Lin Zhang2

  • 1College of Chemistry, Henan Joint International Research Laboratory of Green Construction of Functional Molecules and Their Bioanalytical Applications, Zhengzhou University, Zhengzhou, China. zhaohui.li@zzu.edu.cn.

Methods in Molecular Biology (Clifton, N.J.)
|April 5, 2020
PubMed
Summary
This summary is machine-generated.

This study presents a fast and sensitive lateral flow test strip (LFTS) for detecting glutathione (GSH) using fluorescent quantum dots. The developed assay offers a simple, portable solution for point-of-care testing within 10 minutes.

Keywords:
GlutathioneHeLa cell extractLateral flow test stripQuantum dots

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Area of Science:

  • Biomedical Engineering
  • Analytical Chemistry
  • Nanotechnology

Background:

  • Lateral flow test strips (LFTSs) offer rapid, portable, and user-friendly detection methods.
  • Fluorescent quantum dots (QDs) provide sensitive and stable signal generation for biosensing applications.
  • Glutathione (GSH) is a crucial biomarker for oxidative stress and cellular health.

Purpose of the Study:

  • To develop a rapid and sensitive "off-on" lateral flow test strip (LFTS) for point-of-care detection of glutathione (GSH).
  • To utilize fluorescent quantum dots as signaling probes for enhanced sensitivity and a straightforward readout.
  • To validate the performance of the developed LFTS for GSH detection in biological samples.

Main Methods:

  • Fabrication of a lateral flow test strip incorporating fluorescent quantum dots.
  • Optimization of assay conditions for glutathione detection.
  • Establishment of a linear relationship and determination of the limit of detection for GSH.
  • Application of the LFTS for detecting GSH in HeLa cell extracts.

Main Results:

  • The developed LFTS demonstrated a rapid detection capability, completing the assay within 10 minutes.
  • A good linear relationship was observed for GSH concentrations ranging from 0.1 to 15 μM.
  • A sensitive detection limit of 25 nM for GSH was achieved under optimal conditions.
  • The LFTS successfully detected GSH in complex biological matrices, specifically HeLa cell extracts.

Conclusions:

  • The proposed "off-on" fluorescent quantum dot-based LFTS provides a sensitive, rapid, and simple method for point-of-care glutathione detection.
  • This technology holds promise for applications in clinical diagnostics and biological research, particularly for assessing oxidative stress.
  • The successful detection in cell extracts highlights the potential of this LFTS for real-world biological sample analysis.