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Updated: Sep 30, 2026
Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
Published on: February 1, 2022
A robust and recyclable magnetic three-dimensional nitrogen-doped graphene aerogel for magnetic solid-phase
Shuting Zhao1, Jiajia He1, Xuechun Fu1
1Shandong Key Laboratory of Healthy Food Resources Exploration and Creation, School of Food Science and Engineering, State Key Laboratory of Green Papermaking and Resource Recycling, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China.
Abstract:
To suppress graphene restacking and enable diverse intermolecular interactions, a magnetic three-dimensional nitrogen-doped graphene aerogel was synthesized via a one-step hydrothermal approach and applied to magnetic solid-phase extraction (MSPE) of pyrethroids. The aerogel exhibited synergistic properties, including strong magnetic response, good adsorption capacity, and excellent recyclability over ten consecutive extraction-regeneration cycles. Integrated analysis of adsorption isotherm/kinetic data and spectroscopic evidence revealed that π-π stacking, hydrophobic interactions, and hydrogen bonding were the predominant mechanisms governing the adsorption process. Moreover, the MSPE method with HPLC was employed for the determination of pyrethroid residues in vegetables. Under optimal conditions, this method exhibited excellent linearity (3.3-330 μg kg-1, R2 ≥ 0.9981), a low limit of detection (1.0 μg kg-1), high matrix effect tolerance (|ME| ≤ 2.79%), and outstanding precision (RSD ≤ 7.72%). Furthermore, satisfactory spiked recoveries (78.52%-116.64%) were obtained in vegetable samples. This study establishes a robust and matrix-compatible analytical method for the determination of pyrethroid residues in vegetable samples.
