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Fast Reactions01:27

Fast Reactions

Fast reactions occurring in times shorter than the time needed to mix reactants pose a unique challenge for investigation. In a liquid-phase continuous-flow system, reactants A and B are swiftly pushed into the mixing chamber, where mixing occurs within 1 ms. The reaction mixture then flows through an observation tube, and one measures light absorption to determine species concentrations at various points of the tube. This method is most appropriate when relatively large volumes of reactants...

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Fluorescence detection methods for microfluidic droplet platforms
14:16

Fluorescence detection methods for microfluidic droplet platforms

Published on: December 10, 2011

Fast quantitative single-molecule detection at ultralow concentrations.

Philippe Haas1, Patrick Then, Andreas Wild

  • 1National Center of Competence for Research in Nanoscale Science (NCCR), Institute of Physics, Klingelbergstrasse 82, CH-4056 Basel, Switzerland.

Analytical Chemistry
|June 24, 2010
PubMed
Summary
This summary is machine-generated.

We achieved ultrasensitive single-molecule detection at attomolar concentrations using optical fiber technology and turbulent flow. This breakthrough enables faster, more sensitive assays for diagnostics.

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Area of Science:

  • Analytical Chemistry
  • Biophysics
  • Optical Engineering

Background:

  • Single-molecule fluorescence assays are crucial for sensitive detection but limited by diffusion to low picomolar concentrations.
  • Current methods face challenges in achieving high sensitivity and rapid measurements simultaneously.

Purpose of the Study:

  • To overcome the diffusion limitations of traditional single-molecule assays.
  • To develop a method for quantitative single-molecule detection at attomolar concentrations.
  • To enable rapid and ultrasensitive fluorescence detection for various applications.

Main Methods:

  • Utilizing a single-mode optical fiber for simultaneous excitation and detection of fluorescence.
  • Implementing turbulent flow to enhance molecular transport to the detection zone.
  • Quantitative analysis of single-molecule signals at extremely low concentrations.

Main Results:

  • Demonstrated quantitative single-molecule detection at attomolar concentrations.
  • Achieved detection within a measurement time of 1 minute.
  • Significantly improved sensitivity compared to conventional methods.

Conclusions:

  • The developed method overcomes diffusion limitations for ultrasensitive single-molecule detection.
  • High detectability and short measurement times are achieved through optical fiber and turbulent flow.
  • This technique holds significant promise for ultrasensitive assays, sensors, and point-of-care medical diagnostics.