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Summary

This study introduces a novel single-component nanoprobe using multiplexing upconversion nanoparticles (UCNPs) for antioxidant pattern recognition. The UCNP sensor array distinguishes multiple antioxidants and cysteine enantiomers by analyzing fluorescence recovery patterns.

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Area of Science:

  • Nanotechnology
  • Analytical Chemistry
  • Biochemistry

Background:

  • Upconversion nanoparticles (UCNPs) exhibit unique photoluminescence properties.
  • Polydopamine (PDA) acts as a fluorescence quencher via fluorescence resonance energy transfer (FRET).
  • Antioxidants can inhibit PDA formation, preventing fluorescence quenching.

Purpose of the Study:

  • To develop a single-component nanoprobe for antioxidant pattern recognition.
  • To create a multiplexed UCNP sensor array for discriminating multiple analytes.
  • To demonstrate chiral discrimination capabilities for molecules like cysteine enantiomers.

Main Methods:

  • Preparation of multiplexing UCNPs with three distinct fluorescence emission peaks.
  • Coating UCNPs with a polydopamine (PDA) layer as a universal quencher.
  • Utilizing the differential inhibition of PDA formation by antioxidants to modulate UCNP fluorescence.
  • Employing the three emission peaks as a sensor array for pattern recognition.

Main Results:

  • The developed nanoprobe successfully recognized and discriminated between various antioxidants and their mixtures.
  • The sensor array demonstrated high sensitivity and selectivity in detecting antioxidants.
  • Excellent performance was achieved in the chiral discrimination of cysteine enantiomers.
  • The single-component system enabled a
  • turn-on
  • sensing mechanism.

Conclusions:

  • A novel single-component nanoprobe based on multiplexing UCNPs and PDA quenching was successfully developed.
  • The UCNP sensor array offers a powerful platform for pattern recognition of antioxidants and chiral molecules.
  • This innovative approach opens new avenues for widespread applications in sensing and diagnostics.