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Fabrication of Zero Mode Waveguides for High Concentration Single Molecule Microscopy
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Single Effective Complex Loading into Zero-Mode Waveguides Optimized with Fluorescence Evaluation at Quenching and

Lu Wang1,2, Peilin Zang1,2, Jinze Li1,2

  • 1School of Biomedical Engineering (Suzhou), Division of Life Sciences and Medicine, University of Science and Technology of China, 230026 Hefei, China.

ACS Applied Materials & Interfaces
|May 14, 2024
PubMed
Summary

Researchers developed a fluorescence assay to optimize single complex loading in zero-mode waveguides (ZMWs). This method enhances single-molecule detection efficiency for biomedical applications by improving sample loading.

Keywords:
effective loadingfluorescence accumulationfluorescence quenchingternary complexzero-mode waveguides

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Area of Science:

  • Biomedical diagnostics and screening
  • Single-molecule detection technologies
  • Nanophotonics and optical biosensing

Background:

  • Single-molecule detection is crucial for accurate biomedical diagnosis.
  • Zero-mode waveguides (ZMWs) facilitate real-time single biological molecule detection.
  • Lack of reliable assessment for effective complex loading limits ZMW applications in complex interactions.

Purpose of the Study:

  • To establish a fluorescence evaluation method for assessing and optimizing single effective complex loading into ZMWs.
  • To improve the efficiency of single-molecule assays by validating complex loading in ZMWs.

Main Methods:

  • Developed a fluorescence evaluation at quenching and accumulation checkpoints.
  • Designed a primer-template-enzyme ternary complex for assessment.
  • Validated complex loading using quantity statistics (quenching) and functional activity (accumulation).

Main Results:

  • Optimized loading parameters (time, procedures, enzyme amount) to increase single-molecule effective occupancy to 25.48%.
  • Achieved 68.86% of the theoretical maximum value (37%) based on Poisson statistics.
  • Demonstrated a reliable method for validating effective complex loading in ZMWs.

Conclusions:

  • The fluorescence evaluation provides effective complex-loading validation for ZMWs.
  • This approach significantly improves sample-loading efficiency for single-molecule assays and future sequencing applications.
  • Enhances the utility of ZMWs in complex biological interaction studies.