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Amperometry: Overview01:10

Amperometry: Overview

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Amperometry is a technique commonly used to measure the concentration of specific analytes in a solution by monitoring the electric current generated during an electrochemical reaction. It involves applying a constant potential between a working electrode and a reference electrode to measure the resulting current, which is proportional to the concentration of the analyte. The Clark oxygen electrode operates based on this principle of amperometry. It consists of a cathode and an anode enclosed...
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  5. Engineering
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  9. Air Pollution Modelling And Control
  11. Portable Label-free Electrochemical Aptasensor For Sensitive Detection Of Paraquat Herbicide Mediated By Oxygen Reduction Reaction

Portable label-free electrochemical aptasensor for sensitive detection of paraquat herbicide mediated by oxygen reduction reaction

Kamonrat Phopin1, Waralee Ruankham2, Jaydeep Dave2

  • 1Center for Research Innovation and Biomedical Informatics, Faculty of Medical Technology, Mahidol University, Nakhon Pathom, 73170, Thailand; Department of Clinical Microbiology and Applied Technology, Faculty of Medical Technology, Bangkok, 10700, Thailand.

Talanta
|September 14, 2024

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View abstract on PubMed

Summary
This summary is machine-generated.

A new portable electrochemical aptasensor was developed for detecting the toxic herbicide Paraquat (PQ). This simple, label-free device offers rapid and sensitive on-site monitoring for enhanced safety and regulatory enforcement.

Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Biosensor Technology

Background:

  • Paraquat (PQ) is a highly toxic herbicide, banned in many countries but still in global use.
  • Effective on-site monitoring is crucial for enforcing regulations and ensuring public safety.
  • Existing detection methods may lack the portability or simplicity required for routine field use.

Purpose of the Study:

  • To develop a label-free, portable electrochemical aptasensor for sensitive and specific detection of Paraquat (PQ).
  • To create a device suitable for on-site monitoring and regulatory enforcement.

Main Methods:

  • Utilized an aptamer specifically designed to recognize and bind Paraquat (PQ).
  • Employed square-wave voltammetry (SWV) to quantify PQ binding by monitoring the oxygen reduction reaction on an aptamer-functionalized electrode.
Keywords:
AptamerBiosensorsElectrochemistryHuman health

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  • Validated the aptasensor using spiked real-world samples including tap water, pomegranate juice, and orange juice.

    • Main Results:

    • Achieved a broad detection range for PQ from 0.01 to 100.0 μg mL⁻¹.
    • Established a low limit of detection (LOD) of 8.9 ng mL⁻¹.
    • Demonstrated high recovery rates (75%-130%) in spiked food and water samples.
    • Confirmed operational simplicity, portability, and the ability to function without additional redox agents.

    Conclusions:

    • The developed aptasensor shows significant promise for practical, on-site Paraquat (PQ) detection.
    • Its portability, operational simplicity, and sensitivity make it a valuable tool for environmental monitoring and regulatory compliance.
    • The label-free electrochemical approach offers an efficient alternative for routine PQ analysis.
    Paraquat
    Pesticide