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Dispersive magnetic immunoaffinity extraction. Anatoxin-a determination.

Tinh Le¹, Francesc A Esteve-Turrillas¹, Sergio Armenta¹

¹Department of Analytical Chemistry, University of Valencia, 50th Dr. Moliner St., 46100 Burjassot, Spain.

Journal of Chromatography. A

|November 12, 2017

Summary

A new method using magnetic beads and immunoaffinity extraction (d-MagIA) efficiently detects anatoxin-a in water. This approach offers high sensitivity and avoids interferences, improving water safety analysis.

Keywords:

Anatoxin-a Antibody Cyanobacteria Immunoaffinity Ion mobility spectrometry Magnetic

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Area of Science:

Environmental Chemistry
Analytical Chemistry
Biotechnology

Background:

Accurate detection of toxins like anatoxin-a is crucial for water safety.
Existing methods may face challenges with sensitivity or interferences.

Purpose of the Study:

To develop and validate a novel method for preconcentration and determination of anatoxin-a in water.
To assess the efficiency and reliability of the new dispersive magnetic immunoaffinity (d-MagIA) extraction technique.

Main Methods:

Coupling specific monoclonal antibodies with magnetic Sepharose-based beads.
Utilizing dispersive magnetic immunoaffinity (d-MagIA) extraction for sample preconcentration.
Determining anatoxin-a using ion mobility spectrometry (IMS).

Main Results:

Achieved a limit of detection of 0.02 μg/L for anatoxin-a.
Demonstrated satisfactory precision with relative standard deviation < 15%.
Obtained high quantitative recoveries ranging from 91% to 115%.

Conclusions:

The d-MagIA extraction coupled with IMS is a highly effective method for anatoxin-a detection.
This technique offers improved sensitivity and specificity, successfully avoiding isobaric interferences.
The developed methodology represents a significant advancement in water toxin analysis.