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Phthalic Acid Ester-Binding DNA Aptamer Selection, Characterization, and Application to an Electrochemical Aptasensor

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Magnetite azolla impedimetric nanobiosensor for phthalic acid esters quantification.

Maryam Darvishi¹, Shahab Shariati¹, Fariba Safa¹

¹Department of Chemistry, Rasht Branch, Islamic Azad University, Rasht, Iran. shariaty@iaurasht.ac.ir.

Analytical Methods : Advancing Methods and Applications

|April 5, 2023

Summary

Two novel impedimetric biosensors (IBs) using azolla fern and magnetite-modified azolla nanocomposites were developed for detecting phthalic acid esters (PAEs). These sensitive biosensors demonstrate high performance in determining trace PAEs in aqueous samples.

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Area of Science:

Environmental Science
Analytical Chemistry
Materials Science

Background:

Phthalic acid esters (PAEs) are endocrine-disrupting compounds with adverse effects on human development.
Accurate detection of PAEs in aqueous environments is crucial for public health and environmental monitoring.

Purpose of the Study:

To develop and characterize two sensitive impedimetric biosensors (IBs) for the detection of four common PAEs: DBP, DMP, DEHP, and DCHP.
To investigate the interaction of PAEs with the developed biosensors using electrochemical impedance spectroscopy (EIS).

Main Methods:

Fabrication of an azolla-based impedimetric biosensor (AZIB) and a magnetite azolla nanocomposite-based impedimetric nanobiosensor (MAZIB) by modifying a copper electrode.
Utilizing EIS to measure the blocking effect of PAEs on ferrous ion oxidation at the biosensor surface.
Analyzing Nyquist plots to determine changes in charge-transfer resistance (RCT) upon PAE interaction.

Main Results:

Both AZIB and MAZIB showed significant shifts in RCT values upon exposure to PAEs, indicating successful detection.
Smaller PAE molecules resulted in greater RCT shifts due to better surface coverage.
Linear detection ranges from 0.1-1000 μg L⁻¹ were established with low limits of detection (LOD) and quantification (LOQ).
The biosensors exhibited high sensitivity and accuracy in real aqueous samples, with relative recoveries ranging from 93.0-99.3%.

Conclusions:

The developed AZIB and MAZIB are highly sensitive and efficient tools for the trace determination of PAEs in aqueous samples.
The biosensors offer a promising approach for environmental monitoring and public health protection against PAE contamination.