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Hydrogel-based microbeads for Raman-encoded suspension array using the reversed-phase suspension polymerization

Xuejing Chen1,2, Xuesi Zhou1, Qinghua He1

  • 1Shenzhen Key Laboratory for Minimal Invasive Medical Technologies, Institute of Optical Imaging and Sensing, Graduate School at Shenzhen, Tsinghua University, Shenzhen, 518055, Guangdong, China.

Analytical and Bioanalytical Chemistry
|March 12, 2020
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Summary

Researchers developed a simple, cost-effective method for creating Raman-encoded suspension arrays (SA) for multiplexed biomolecule detection. This technique offers high accuracy and sensitivity, with a low limit of detection, expanding material options for Raman encoding.

Keywords:
Encoding methodHydrogel-based microbeadsOne-step synthesisRaman spectrumSuspension array

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Biotechnology

Background:

  • Multiplexed detection assays are crucial for high-throughput biological analysis.
  • Existing encoding methods for microcarriers face limitations in scalability, cost, and material compatibility.
  • Raman spectroscopy offers unique advantages for multiplexing due to its narrow spectral bandwidth.

Purpose of the Study:

  • To develop a novel, efficient, and cost-effective method for synthesizing Raman-encoded suspension arrays (SA).
  • To demonstrate the capability of the synthesized SA for sensitive and accurate multiplexed biomolecule detection.
  • To expand the applicability of Raman encoding by overcoming limitations in molecular assembly and material choice.

Main Methods:

  • A one-step reversed-phase suspension polymerization method combined with UV light curing was employed.
  • Raman reporter molecules were doped into an aqueous phase, dispersed in an oil phase, and then cured.
  • The synthesized microcarriers were utilized for multiplexed biomolecule detection and concentration-dependent analysis.

Main Results:

  • The Raman-encoded SA demonstrated excellent qualitative and quantitative analysis capabilities with a limit of detection as low as 52.68 pM.
  • The method allows for a large number of unique codes within the available spectral range, ensuring high encoding accuracy.
  • The synthesis method is simple, efficient, low-cost, and yields hydrogel-based microbeads with good biocompatibility.
  • Increased signal intensity was achieved by concentrating Raman reporter molecules, expanding material compatibility for encoding.
  • Signal intensity-based encoding was verified, further enhancing detection throughput.

Conclusions:

  • The proposed synthesis method provides a robust platform for generating high-performance Raman-encoded SA.
  • The developed SA enables sensitive, accurate, and high-throughput multiplexed detection of biomolecules.
  • This approach significantly advances the field of microparticle-based assays, offering broader material choices and improved analytical performance.