Hyperbranched aromatic polyamide modified magnetic nanoparticles for the extraction of benzoylurea insecticides

Abstract

Herein, a novel hyperbranched aromatic polyamide-coated magnetic sorbent was prepared by in situ polymerization on the surface of amino-functionalized Fe 3 O 4 nanoparticles. The magnetic sorbent was characterized by transmission electron microscopy, Fourier transform infrared spectroscopy, elemental analysis, Brunauer-Emmett-Teller measurement, and X-ray photoelectron spectroscopy, etc. The new magnetic sorbent was used in the magnetic solid-phase extraction for the detection of seven benzoylurea insecticides. Under optimum conditions, low method detection limits (0.56-1.20 ng/mL), acceptable coefficient of determination (0.9967-0.9996), wide linear ranges (2.5-500.0 ng/mL), and good repeatability (intraday: 2.0-7.3%; interday: 1.9-9.2%) were achieved. The magnetic solid-phase extraction method based on the new magnetic sorbent showed good reliability in the analysis of seven benzoylurea insecticides in real water samples, as the relative recoveries were in the range from 80.1 to 116.3% with satisfactory RSDs (0.1-9.8%). By means of density functional theory and semiempirical quantum mechanical, the binding configuration and interaction energy of hyperbranched aromatic polyamide and benzoylurea insecticides were calculated. The result of theoretical calculation revealed that the adsorption of benzoylurea insecticides by hyperbranched aromatic polyamide was derived from hydrogen bonding and π-π stacking. The contribution of π-π stacking was greater than that of hydrogen bond, which was confirmed by energy decomposition analysis.

Fluorine-Functionalized Covalent-Organic-Framework-Coated Stir Bar for the Extraction of Benzoylurea Insecticides in Pear Juice and Beverage Followed by High-Performance Liquid Chromatography–Ultraviolet Detection

“…A summary of reported methods based on the SPE technique for BU determination is provided in Table . It can be seen that the LODs of the established method were superior to those of refs and , with superior reusability (over 65 times) of the coated stir bar. However, the LODs were higher than those of refs − , which may be due to the lower enrichment factor of the proposed method.…”

Effect of the Synthetic Approach on the Formation and Magnetic Properties of Iron-Based Nanophase in Branched Polyester Polyol Matrix

“…At the same time, most of the works are devoted to the use of dendrimers, namely polyamidomine (PAMAM) or propyleneimine for the synthesis of the magnetic NPs of iron compounds [ 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 ]. Among a small number of examples of the use of hyperbranched polymers to stabilize Fe 3 O 4 nanoparticles are branched polyamines HAPAM [ 70 ], HBPAMAM [ 71 ], PAMAM-b-PEG-FA [ 72 ], and PEI [ 73 ]. However, the presence of the NH fragment in the molecule leads to the high cytotoxicity of PAMAM and the hyperbranched polyamines [ 45 ].…”

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

“…The functional shell of MSPE adsorbents determines their selectivity and extraction efficiency and avoids the oxidation and aggregation of magnetic core [11]. At present, multifarious functional materials have been applied for the preparation of MSPE adsorbents including carbon-based materials (graphene oxide and carbon nanotubes), dendrimers, covalent organic frameworks, and metal-organic frameworks [12,13].…”