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Related Experiment Video

Updated: Jun 1, 2026

Fluorescence detection methods for microfluidic droplet platforms
14:16

Fluorescence detection methods for microfluidic droplet platforms

Published on: December 10, 2011

High-efficiency molecular counting in solution:  single-molecule detection in electrodynamically focused microdroplet

N Lermer1, M D Barnes, C Y Kung

  • 1Chemical and Analytical Sciences Division, Oak Ridge National Laboratory, Mail Stop 6142, P.O. Box 2008, Oak Ridge, Tennessee 37831.

Analytical Chemistry
|June 7, 2011
PubMed
Summary

This study demonstrates sensitive, real-time detection of single rhodamine 6G molecules in microdroplets. The method offers high throughput and tunable interaction times for enhanced molecular analysis.

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Last Updated: Jun 1, 2026

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Use of Dual Optical Tweezers and Microfluidics for Single-Molecule Studies

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Area of Science:

  • Analytical Chemistry
  • Physical Chemistry
  • Spectroscopy

Background:

  • Single-molecule detection is crucial for sensitive chemical analysis.
  • Existing methods often face limitations in throughput or sensitivity.
  • Controlling droplet-laser interaction time is key for optimizing detection.

Purpose of the Study:

  • To develop a novel method for high-throughput, single-molecule fluorescence detection.
  • To enable tunable interaction times for microdroplets passing through a laser beam.
  • To achieve sensitive detection of rhodamine 6G molecules.

Main Methods:

  • Utilizing a linear quadrupole to focus microdroplet streams through a laser beam waist.
  • Adjusting droplet-laser interaction time by varying glycerol concentration in water droplets.
  • Employing fluorescence burst detection for real-time single-molecule identification.

Main Results:

  • Achieved real-time fluorescence detection of single rhodamine 6G molecules with a signal-to-noise ratio of ~10.
  • Demonstrated tunable droplet-laser interaction times from 5 to 200 ms.
  • Obtained high volume throughput rates (~10 pL/s), significantly exceeding particle levitation techniques.
  • Reached total molecular detection efficiencies of ~80% for low-concentration solutions (15-100 fM).

Conclusions:

  • The developed microdroplet-based method provides a sensitive and high-throughput approach for single-molecule detection.
  • Tunable interaction times enhance the flexibility and applicability of the technique.
  • This method shows great promise for various applications in chemical and biological analysis.