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Updated: Jan 15, 2026
High-Throughput Measurement and Classification of Organic P in Environmental Samples
Published on: June 8, 2011
Bioplatform for Detecting Organophosphorus Compound Exposure
Tobias Ramiro Filippini1, Andres Hunt1, M Gabriela Lagorio1
1Tobias Ramiro Filippini is an Undergraduate Student; and M. Gabriela Lagorio, PhD, Virginia Diz, PhD, and Graciela A. González, PhD, are Professors/Researchers; all in the Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales. Andres Hunt is a Research Support Specialist; and M. Gabriela Lagorio and Graciela A. González, PhD, are Professors/Researchers; all in CONICET, Facultad de Ciencias Exactas y Naturales, Instituto de Química Física de los Materiales, Medio Ambiente y Energía (INQUIMAE). Gabriela Cordon, PhD, is a Professor/Researcher, in the Área de Educación Agropecuaria y Ambiental, Facultad de Agronomía, and the Facultad de Agronomía, Instituto de Investigaciones Fisiológicas y Ecológicas vinculadas a la Agricultura (IFEVA). All of the authors are located at the Universidad de Buenos Aires, Buenos Aires, Argentina.
This study introduces a plant-based method to detect organophosphorus pesticides like chlorpyrifos. Chicory plants and electrochemical analysis can identify pesticide exposure, serving as a crucial environmental monitoring tool.
Area of Science:
- Environmental Science
- Biotechnology
- Analytical Chemistry
Background:
- Organophosphorus compounds, including pesticides and chemical warfare agents, pose significant environmental and health risks.
- Acetylcholinesterase (AChE) is a key enzyme affected by these compounds, making it a potential target for detection.
- The Plant Biomarker Challenge aimed to develop a system for detecting exposure to such hazardous substances.
Purpose of the Study:
- To develop and validate a plant-based platform for distinguishing between unexposed and pesticide-exposed plants.
- To assess the efficacy of using plant acetylcholinesterase activity as a biomarker for organophosphate exposure.
- To establish a reliable method for environmental monitoring of chemical agents.
Main Methods:
- An electrochemical method was developed to measure alterations in acetylcholinesterase activity.
- Infrared spectrometry was used for initial validation in aqueous phase assays.
- Chicory plant extracts were analyzed using electrochemical impedance spectroscopy after exposure to varying chlorpyrifos concentrations.
Main Results:
- The proposed platform successfully differentiated between unexposed chicory plants and those exposed to chlorpyrifos.
- Detection was possible for chlorpyrifos doses exceeding one-tenth of the manufacturer's recommended mean dose.
- Electrochemical impedance spectroscopy indirectly evaluated AChE activity through its reaction with acetylthiocholine chloride and silver nanoparticles.
Conclusions:
- A plant species (chicory) and measurement methodology can serve as a biomarker for organophosphate pesticide exposure.
- The developed electrochemical system provides a sensitive and specific method for detecting environmental contamination.
- This approach offers a novel strategy for monitoring accidental or deliberate releases of harmful organophosphorus compounds.
