Phenylboronic acid‐functionalized cross‐linked chitosan magnetic adsorbents for the magnetic solid‐phase extraction of benzoylurea pesticides

Abstract

In this study, a 4-formylphenylboronic acid-modified cross-linked chitosan magnetic nanoparticle (FPBA@CCHS@Fe 3 O 4 ) was fabricated. The synthesized material was utilized as the magnetic solid-phase extraction adsorbent for the enrichment of six benzoylurea pesticides. In addition to B-N coordination, FPBA@CCHS@Fe 3 O 4 interacts with benzoylureas through hydrogen bonds and π-π stacking interaction on account of rich active groups (amino and hydroxyl) and aromatic rings in structure. Compared to traditional extraction methods, less adsorbent (20 mg) and reduced extraction time (3 min) were achieved. The adsorbent also exhibited good reusability (no less than 10 times). Coupled with a highperformance liquid chromatography-diode array detector, satisfactory recoveries (89.1-103.9%) and an acceptable limit of detection (0.2-0.7 μg/L) were obtained.Under optimized conditions, the established method was successfully applied to the tea infusion samples from six major tea categories with acceptable recoveries ranging from 76.8 to 110%, indicating its application potential for the quantitative detection of pesticides in complex matrices.

Room temperature fabrication of magnetic covalent organic frameworks for analyzing sulfonamide residues in animal‐derived foods

“…According to recent reports, liquid-liquid extraction [8], microwave-assisted extraction [9], the QuEChERS method [10], and SPE [11] are commonly used for analyzing SAs. In contrast, magnetic SPE (MSPE), which combines the advantages of SPE and Fe 3 O 4 magnetic nanoparticles, has obvious advantages for analyzing SAs, including a simpler and shorter operational procedure, a more convenient liquid-solid separation, lower reagent consumption and economic costs [12], and easily recyclable magnetic adsorbents [13,14].…”

Integrated ultrasound‐assisted magnetic solid‐phase extraction for efficient determination and pre‐concentration of polycyclic aromatic hydrocarbons from high‐consumption soft drinks and non‐alcoholic beers in Iran

“…So far various materials have been employed to produce magnetic adsorbents [17,18], among them, carbon-based adsorbents have received increasing attention due to their outstanding performance, high extraction capacity, and good dispersion in the sample, affordable price, and availability. Graphene oxide seems to be a promising candidate for the MSPE process because of its high porosity, surface area and active site (functional groups), good dispersibility, simple preparation procedure, and high selectivity [19][20][21].…”