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Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation

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Peroxidase driven micromotors for dynamic bioremediation.

Melis Bayraktaroğlu¹, Beatriz Jurado-Sánchez², Murat Uygun³

¹Adnan Menderes University, Faculty of Science and Arts, Department of Chemistry, Aydın, Turkey.

Journal of Hazardous Materials

|June 7, 2021

Summary

New micromotors using poly(3,4-ethylenedioxythiophene) (PEDOT)-Au/peroxidase efficiently remove phenolic compounds from wastewater. This dynamic biocatalytic platform offers enhanced stability and activity for environmental bioremediation.

Keywords:

Bioremediation Enzyme immobilization Micromotors Phenolic compounds

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Area of Science:

Environmental Science
Materials Science
Biotechnology

Background:

Phenolic compounds are environmental pollutants found in industrial wastewater.
Efficient removal strategies are needed to mitigate adverse health effects.
Poly(3,4-ethylenedioxythiophene) (PEDOT)-Au/peroxidase micromotors offer a novel approach.

Purpose of the Study:

To develop and evaluate dynamic biocatalytic platforms for phenolic compound removal.
To investigate the performance of PEDOT-Au/peroxidase micromotors in wastewater treatment.
To assess the stability and reusability of the enzyme-immobilized micromotors.

Main Methods:

Synthesis of PEDOT-Au/peroxidase micromotors via template electrodeposition.
Covalent immobilization of peroxidase within the micromotor's inner gold layer.
Evaluation of kinetic parameters, operational stability, and propulsion speed.
Assessment of phenolic compound removal efficiency compared to free enzymes.

Main Results:

Enzyme immobilization increased enzymatic activity over 2-fold and enhanced operational stability.
Micromotors achieved propulsion speeds up to 60 µm/s with enhanced fluid mixing.
Removal efficiencies reached up to 60% for model phenolics, significantly higher than free peroxidase (27%).
Micromotors demonstrated excellent reusability with nearly 100% activity over ten cycles.

Conclusions:

PEDOT-Au/peroxidase micromotors represent an effective bioremediation strategy for phenolic compounds.
The dynamic biocatalytic platforms show promise for large-scale water treatment.
Enhanced enzyme activity, stability, and efficient removal highlight the potential of this technology.