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Molecularly Imprinted Nanoparticles Based Sensor for Cocaine Detection.

Roberta D'Aurelio1, Iva Chianella1, Jack A Goode2

  • 1Advanced Diagnostics and Sensors Group, Cranfield University, Cranfield, Bedfordshire MK43 0AL, UK.

Biosensors
|March 8, 2020
PubMed
Summary
This summary is machine-generated.

This study presents a novel sensor using molecularly imprinted polymer nanoparticles (nanoMIPs) for sensitive electrochemical detection of cocaine. The developed nanoMIPs sensor offers a portable and cost-effective solution for trace cocaine analysis.

Keywords:
EIS sensorcocainedrugs of abuseelectrochemical impedance spectroscopymolecularly imprinted polymer nanoparticles

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Area of Science:

  • Electrochemistry
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Trace level detection of illicit substances like cocaine is crucial for forensic and security applications.
  • Existing detection methods can be complex, expensive, or lack portability.
  • Molecularly imprinted polymers (MIPs) offer high selectivity for target analyte recognition.

Purpose of the Study:

  • To develop and optimize a sensitive electrochemical sensor for cocaine detection.
  • To utilize molecularly imprinted polymer nanoparticles (nanoMIPs) as the recognition element.
  • To employ electrochemical impedance spectroscopy (EIS) for signal transduction.

Main Methods:

  • Synthesized cocaine-specific nanoMIPs via solid-phase extraction.
  • Characterized nanoMIPs size (~148 nm) using Transmission Electron Microscopy (TEM) and Dynamic Light Scattering.
  • Developed a direct binding assay by immobilizing nanoMIPs onto gold screen-printed electrodes and analyzing with EIS.

Main Results:

  • Achieved a linear detection range for cocaine from 100 pg mL⁻¹ to 50 ng mL⁻¹ (R² = 0.984).
  • Established a limit of detection of 0.24 ng mL⁻¹ (0.70 nM) for cocaine.
  • Demonstrated high specificity with no cross-reactivity to morphine and negligible response to levamisole.

Conclusions:

  • The developed nanoMIPs-based electrochemical sensor provides a highly sensitive and selective method for cocaine detection.
  • The sensor exhibits potential for portable, cost-effective, and on-site cocaine analysis.
  • This technology could significantly advance forensic and drug screening capabilities.