Simultaneous effervescence-assisted microextraction and magnetic adsorbent generation for rapid and cost-effective organochlorine pesticides analysis

• Published in: Food chemistry Vol. 457; p. 140192
• Main Authors: Li, Wenxuan, Zhang, Qinfeng, Liu, Yuwei, Deng, Bowen, Zheng, Yuanyuan, Li, Jun, Chen, Di
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.11.2024
• Subjects: Adsorption; Cost-Benefit Analysis; Effervescence; Food Contamination - analysis; Fruit and Vegetable Juices - analysis; GC-ECD; Herbal extract; Hydrocarbons, Chlorinated - analysis; Hydrocarbons, Chlorinated - chemistry; Hydrocarbons, Chlorinated - isolation & purification; Juices; Limit of Detection; Liquid Phase Microextraction - instrumentation; Liquid Phase Microextraction - methods; Magnetic solid-phase extraction; Organochlorine pesticide; Pesticides - analysis; Pesticides - chemistry; Pesticides - isolation & purification; Solid Phase Microextraction - instrumentation; Solid Phase Microextraction - methods; GC-ECD; Magnetic solid-phase extraction; Juices; Herbal extract; Organochlorine pesticide; Effervescence
• ISSN: 0308-8146; 1873-7072; 1873-7072
• DOI: 10.1016/j.foodchem.2024.140192

This study introduced an innovative magnetic effervescence-assisted microextraction method, streamlining the preparation of effervescent tablets through a one-pot method that blends a CO2 donor (Na2CO3) and an H+ donor (NaH2PO4) with bare magnetic particles (Fe3O4) and an adsorbent (hydroxylated multi-walled carbon nanotubes), followed by pressing. During the extraction process, the bare magnetic particles and adsorbent undergo in-situ self-assembly to create a magnetic adsorbent. The effervescence generates bubbles that enhance effective extraction and magnetism facilitates the easy separation of the magnetic adsorbent from the sample solution, completing the process within 4 min. Applied to organochlorine pesticide analysis in fruit juices and herbal extracts, the method exhibits excellent linearity (R2 > 0.993), sensitivity (detection limits: 0.010–0.125 ng/mL), accuracy (recoveries: 85.8–99.9%), and precision (RSDs < 9.7%) with GC-ECD. Overall, this approach stands out for its simplicity, cost-effectiveness, and suitability for on-site analysis, owing to its operational ease and independence from specialized equipment. [Display omitted] •A new MEAM method was proposed that avoids pre-synthesized magnetic materials.•Magnetic adsorbent was in situ self-assembled during the extraction process.•Bubbles and magnetism expedite the extraction process, finishing in 4 min.•Satisfactory OCP detection limits in juices and herbal extracts (10–125 ng/L).•Three metrics of AES, GAPI, and AGREE illustrates method's excellent greenness.