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Can Direct-Immersion Aqueous-Aqueous Microextraction Be Achieved When Using a Single-Drop System?

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  • 1School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu Province, PR China.

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|September 1, 2022
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Summary
This summary is machine-generated.

This study introduces a novel pH-dependent magnetic microextraction system for rapid, direct fluorescence detection of glutathione S-transferase (GST) in biological samples. The method efficiently extracts and enriches GST, overcoming matrix interferences for accurate analysis.

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Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Nanotechnology

Background:

  • Direct analysis of biological analytes like glutathione S-transferase (GST) in complex matrices is challenging due to difficulties in extraction and enrichment.
  • Existing aqueous-aqueous single-drop microextraction systems face limitations in achieving efficient analyte recovery and reducing matrix effects.

Purpose of the Study:

  • To develop a pH-dependent polydopamine (PDA)-coated vesicle/Fe3O4 magnetic aqueous-aqueous system for rapid, direct fluorescence detection of GST.
  • To enable sensitive and selective quantification of GST in biological samples like blood and urine without pretreatment.

Main Methods:

  • Utilized Fe3O4@PDA@GST-Aptamer nanospheres for initial GST extraction from sample solutions.
  • Employed a pH-change-induced release and capture mechanism using polydiacetylene vesicles for signal amplification.
  • Integrated the process within a single-drop microreactor (SDMR) for rapid (6s) extraction and enrichment.

Main Results:

  • Achieved direct fluorescence detection of GST with a linear range of 0.005 to 0.5 μg/mL and a limit of detection of 0.834 ng/mL.
  • Demonstrated high recoveries for GST in genuine blood (90.8–108.0%) and urine (91.6–102.8%) samples.
  • Successfully reduced matrix effects, enabling direct analysis without sample pretreatment.

Conclusions:

  • The developed pH-dependent magnetic aqueous-aqueous SDMR system offers a rapid and efficient method for direct GST detection in complex biological samples.
  • This approach enhances fluorescence signals through target enrichment and reduced matrix interference, paving the way for point-of-care diagnostics.