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Attogram "Meth" Detection Enabled by Selective Organic Crystal Disaggregation via Directed Crystal Level

Wei Xu1,2, Yanyan Fu1, Huan Liu1

  • 1State Key Lab of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences , Changning Road 865, Shanghai, 200050, China.

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This study introduces a novel crystal disaggregation strategy for ultrasensitive molecule detection. This method achieves attogram-level detection limits for methamphetamine, significantly outperforming traditional probes.

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Area of Science:

  • Crystal Engineering
  • Supramolecular Chemistry
  • Analytical Chemistry

Background:

  • Traditional molecular probes often rely on host-guest interactions, limiting sensitivity.
  • Developing ultrasensitive detection methods is crucial for identifying trace amounts of analytes.

Purpose of the Study:

  • To propose and validate a crystal-level interaction strategy for ultrasensitive molecule detection.
  • To demonstrate the selective and efficient detection of methamphetamine hydrochloride (MA).

Main Methods:

  • Self-assembly of highly ordered pyrene methanol (PM) crystals using hydrogen bonding and π-π stacking.
  • Investigating the destabilization of the PM crystal {011} surface by MA.
  • Quantifying detection limits using the crystal disaggregation response.

Main Results:

  • The proposed crystal-guest interaction strategy enables rapid crystal disaggregation and significant signal change.
  • Selective and efficient destabilization of PM crystals by MA was achieved.
  • An attogram-level detection limit (5.4 ag/mL, 29.1 fM) for MA was obtained, surpassing existing methods by nine orders of magnitude.

Conclusions:

  • Crystal-level interaction offers a highly efficient and ultrasensitive approach for molecule detection.
  • This strategy provides a significant advancement over traditional host-guest molecular probes.
  • The developed method shows great promise for the trace detection of illicit drugs and other analytes.