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Enzyme-linked immunosorbent assay by image analysis using a charge-coupled device array detector

F G Sánchez1, A N Díaz, J Lovillo

  • 1Departamento de Química Analítica, Universidad de Málaga, Málaga, 29071, Spain.

Analytical Biochemistry
|July 15, 1996
PubMed
Summary

This study introduces a new fluorescence ELISA method for quantifying dichlorprop methyl ester. The charge-coupled device camera offers comparable analysis time, sensitivity, and precision to traditional spectrofluorometers.

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Area of Science:

  • Agricultural Chemistry
  • Analytical Chemistry
  • Biochemistry

Background:

  • Dichlorprop methyl ester is a herbicide requiring accurate quantification.
  • Traditional methods for herbicide analysis can be time-consuming and complex.
  • Developing sensitive and precise analytical techniques is crucial for environmental monitoring and agricultural applications.

Purpose of the Study:

  • To develop and validate a fluorescence enzyme-linked immunosorbent assay (ELISA) for quantifying dichlorprop methyl ester.
  • To compare the performance of a charge-coupled device (CCD) camera-based fluorescence image analysis with a conventional spectrofluorometer for ELISA.
  • To assess the selectivity of the developed ELISA method for dichlorprop methyl ester against structurally similar compounds.

Main Methods:

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  • Production of antibodies against dichlorprop methyl ester via rabbit immunization with a conjugate.
  • Quantification using a fluorescence enzyme-linked immunosorbent assay (ELISA).
  • Data acquisition using both a spectrofluorometer and a charge-coupled device (CCD) camera for image analysis.

Main Results:

  • A strong correlation was observed between CCD camera-based image analysis data and spectrofluorometer data in ELISA.
  • The CCD detector-based fluorescence image analysis demonstrated applicability to ELISA, with comparable analysis time, sensitivity, and precision to spectrofluorometer-based methods.
  • The ELISA procedure exhibited high selectivity, with significant responses for dichlorprop (83.59 µg/ml) and 2,4,5-T (388.23 µg/ml), and no response for triclopyr, ioxynil, bentazone, and MCPA.

Conclusions:

  • Fluorescence image analysis using a CCD detector is a viable alternative for ELISA, offering efficient and precise quantification.
  • The developed ELISA method is selective and suitable for detecting dichlorprop methyl ester in the presence of related compounds.
  • This technique provides a valuable tool for the analysis of pesticides in agricultural and environmental contexts.