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Sacrificial-Site Engineering Enables Enhanced Ion-Interference Resistance in Magnetic Solid-Phase Extraction.

Jing Zhou1, Hui Chen1, Qidong Yu2

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|January 30, 2026
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Summary
This summary is machine-generated.

A novel magnetic solid-phase extraction method overcomes salt interference in complex samples. This ion-interference-resistant strategy enhances trace analysis of contaminants like aflatoxin B1 in high-salinity foods.

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Environmental Science

Background:

  • Magnetic solid-phase extraction (MSPE) faces efficiency challenges in high-ionic-strength environments due to salt ion interference.
  • Salt ions compress the electrical double layer and compete for adsorption sites, destabilizing extraction performance.

Purpose of the Study:

  • To develop an ion-interference-resistant MSPE strategy for robust trace analysis in high-salinity matrices.
  • To engineer a carbon-based sorbent with enhanced salt tolerance and selective analyte adsorption.

Main Methods:

  • Developed a carbon-based sorbent with nitrogen dopants and oxygen vacancies for ion-buffering.
  • Incorporated a hydroxyl-enriched surface for hydrogen bonding and π-π interactions.
  • Implemented an ionic regulation concept to stabilize the interfacial electrostatic environment.

Main Results:

  • The engineered sorbent demonstrated over 90% efficiency retention at 0.1 mol/L NaCl, a 4-fold improvement in salt tolerance.
  • Achieved high recoveries (99.7%-108.2%) and a low detection limit (16.0 pg/g) for aflatoxin B1 in real food samples.
  • Outperformed commercial HPLC sorbents in trace analysis of complex, high-salinity food matrices.

Conclusions:

  • Established a general methodological framework for ionic regulation in MSPE.
  • Provided a robust and practical solution for trace analysis in challenging high-salinity samples.
  • The developed MSPE strategy offers significant advantages for food safety and environmental monitoring.