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Digital surface enhanced Raman spectroscopy for quantifiable single molecule detection in flow.

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|June 19, 2024
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Digitizing surface-enhanced Raman scattering (SERS) events by counting, rather than measuring intensity, significantly enhances molecular detection. This novel approach achieves single-molecule quantification and lowers the limit of detection by an order of magnitude.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Nanotechnology

Background:

  • Surface-enhanced Raman scattering (SERS) offers label-free molecular analysis with potential single-molecule sensitivity.
  • Signal variability from diverse plasmonic environments hinders accurate quantification, especially at low analyte concentrations.
  • Traditional intensity-based limit of detection (LOD) calculations can be limited by SERS signal noise.

Purpose of the Study:

  • To develop a novel method for improving the limit of detection (LOD) in SERS measurements.
  • To enable reliable quantification of single molecules in flowing solutions using SERS.
  • To overcome the limitations of traditional intensity-based LOD calculations in SERS.

Main Methods:

  • Digitizing SERS events by classifying spectra as containing an event or not using a score threshold.
  • Employing multivariate curve resolution for spectral analysis and event classification.
  • Quantifying the binary "yes/no" SERS event data to establish a linear detection region.

Main Results:

  • The digitizing method significantly decreased the limit of detection (LOD) for SERS analysis.
  • The new approach achieved quantification at the single-molecule level in flowing solutions.
  • An order of magnitude improvement in LOD was observed compared to traditional intensity-based methods.

Conclusions:

  • Digitizing SERS events provides a robust method for enhancing sensitivity and enabling single-molecule quantification.
  • This approach overcomes signal variability issues inherent in SERS, leading to more reliable low-concentration analysis.
  • The developed technique pushes the LOD towards the lowest physical limits achievable in SERS.