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Novel SERS-based process analysis for label-free segmented flow screenings.

Alexander Mendl1, J Michael Köhler, Dušan Bošković

  • 1Fraunhofer Institute for Chemical Technology, Pfinztal 76327, Germany. alexander.mendl@ict.fraunhofer.de.

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Summary
This summary is machine-generated.

A novel surface-enhanced Raman spectroscopy (SERS) system integrates with microfluidic segmented flow, enabling label-free chemical analysis of individual droplets. This miniaturized SERS approach demonstrates high sensitivity and stability for real-time process monitoring.

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Area of Science:

  • Analytical Chemistry
  • Microfluidics
  • Spectroscopy

Background:

  • Label-free analytical techniques are crucial for analyzing chemical compositions in microfluidic segmented flow.
  • Existing methods often lack simple integration and miniaturization for real-time droplet analysis.

Purpose of the Study:

  • To develop a miniaturized surface-enhanced Raman spectroscopy (SERS) system for seamless integration with microfluidic segmented flow.
  • To demonstrate the capability of the novel SERS system for label-free chemical analysis of individual droplet contents.

Main Methods:

  • Development of a SERS system utilizing parallelized silver/polyacrylamide composite spots on a carrier plate for segment deposition.
  • Optimization of SERS polymer composite preparation for high signal-to-noise ratio.
  • Case study involving the deamination of adenine to hypoxanthine using a nitrite concentration gradient and multivariate calibration.

Main Results:

  • Successful demonstration of the SERS system's performance and long-term stability.
  • Quantification of adenine and hypoxanthine concentrations despite overlapping Raman spectra using multivariate calibration.
  • Increased adenine conversion with higher nitrite concentration and temperature (35% at 50°C, 60% at 80°C).

Conclusions:

  • The developed miniaturized SERS system offers a simple and effective connection to microfluidic segmented flow processes.
  • This SERS approach enables sensitive, label-free, real-time analysis of chemical reactions within droplets.
  • The system shows significant potential for process analysis and optimization in microfluidic applications.