Preparation of a zirconium terephthalate metal‐organic framework coated magnetic nanoparticle for the extraction of berberine prior to high‐performance liquid chromatography analysis

Self Cite

MIL-101(Fe)) was synthesized for the magnetic solid-phase extraction of three anthraquinones, including aloe-emodin, emodin, and physcion, in rhubarb. The Fe 3 O 4 @NH 2 -MIL-101(Fe) exhibits a high specific surface area of 259.2 m 2 /g with an average pore size of 6.0 nm and high magnetic responsivity of 23.4 emu/g, which may be used as an adsorbent for rapid preconcentration and separation of target analytes. The main parameters for magnetic solid-phase extraction of anthraquinones, including the amount of adsorbent, extraction time, extraction temperature, extraction pH, elution solvent, and elution time, were systematically optimized. The whole extraction process requires a very low amount of adsorbent and a small volume of the sample. Besides, under the optimized conditions, the method shows satisfactory spiked recovery for anthraquinones in the range of 93.3-109.1% and the limits of detection are 1.7-3.4 ng/mL. The relative standard deviations for intra-and inter-day precision are 0.2-1.3% and 0.2-0.6%, respectively. The experimental results indicate that the developed method is feasible for the analysis of anthraquinones in rhubarb.

Section: Resultsmentioning

confidence: 99%

Preparation of magnetic metal‐organic framework MIL‐101(Fe) and its application in the extraction of anthraquinones in rhubarb

Zhou

Yin

Chen

et al. 2022

Self Cite

“…Among these sample pretreatment technologies, MSPE has drawn the attention of researchers due to its rapid solid-liquid separation, simple operation, and low consumption of organic solvents [10]. In MSPE, sorbents, including graphene oxide [11], carbon nanotubes [12], polymers [13], metal organic frameworks [14], and covalent organic frameworks [15], play a key role.…”

Section: Introductionmentioning

confidence: 99%

Perfluoro octanoic acid–modified magnetic hyperbranched polyamideamine as a sorbent for the extraction of fluorine‐containing pesticides from water samples

Meng

Liu

Fan

et al. 2021

Perfluoro octanoic acid was modified on the surface of magnetic hyperbranched polyamideamine by acid amine condensation. The morphology and chemical composition of perfluoro octanoic acid-modified magnetic hyperbranched polyamideamine was characterized by transmission electron microscopy, Fourier transform infrared spectroscopy, zeta potential, particle size analysis, Brunauer-Emmett-Teller measurement, and X-ray photoelectron spectroscopy. Perfluoro octanoic acid-modified magnetic hyperbranched polyamideamine was applied in magnetic solid phase extraction for the separation and enrichment of four fluorine-containing pesticides (indoxacarb, metaflumizone, cyflumetofen, and cyhalothrin). The magnetic solid phase extraction method based on perfluoro octanoic acid-modified magnetic hyperbranched polyamideamine has low method detection limits (0.30-0.49 μg/L), a satisfactory coefficient of determination (0.9995-0.9999), wide linear ranges (2.5-250 μg/L), and good repeatability (intraday: 2.6-4.7%; interday: 1.1-7.9%). The enrichment factors and extraction efficiences varied from 55 to 76 and 69 to 96%, respectively. The sorbent-to-sorbent reproducibility was in the range of 3.2-7.6%, indicating that the synthesis of the sorbent was reliable. For the detection of actual water samples, the relative recoveries were in the range from 80.1 to 114.4% with relative standard deviations less than 9.6%. The calculation results of quantum chemistry calculations showed that after the modification of perfluoro octanoic acid, the interaction between the sorbent and four fluorine-containing pesticides was stronger.

“…To extract target analytes from different samples, dispersive SPE [6], SPME [7, 8], spin‐column micro‐SPE [9], LPME [10, 11] and magnetic solid‐phase extraction (MSPE) [12–15] were adopted by researchers. Among these technologies, MSPE is worthy of attention due to its rapid solid‐liquid separation with the help of magnets, high enrichment factors, and low solvent consumption [16].…”

Section: Introductionmentioning

confidence: 99%

Use of 1‐octyl‐3‐methylimidazole hexafluorophosphate modified magnetic hyperbranched polyamideamine as sorbent for the extraction of pyrethroid insecticides from tea infusion

Liu

Meng

Fan

et al. 2021

Magnetic hyperbranched polyamideamine was carboxylated using succinic anhydride and modified further with 1‐octyl‐3‐methylimidazole hexafluorophosphate successively. The morphology and chemical composition of the prepared material was characterized by transmission electron microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, Brunauer–Emmett‐Teller measurement, X‐ray photoelectron spectroscopy, etc. 1‐Octyl‐3‐methylimidazole hexafluorophosphate modified magnetic hyperbranched polyamideamine was used as sorbent in the magnetic solid‐phase extraction for the separation and enrichment of five pyrethroid insecticides from tea infusion. The magnetic solid‐phase extraction method proposed in this article has low method detection limits (0.53–0.71 ng/mL), acceptable coefficient of determination (0.9992–0.9998), wide linear ranges (2.5–500.0 ng/mL), and good repeatability (intraday: 1.2–6.3%; interday: 1.6–5.4%). In the detection of five pyrethroid insecticides in tea infusion, relative recoveries were in the range from 87.7 to 114.7% with satisfactory relative standard deviations (0.2–7.4%). With the aid of quantum chemistry calculations, the interaction energy between the sorbent and five pyrethroid insecticides was calculated, which proved the necessity of the modification of 1‐octyl‐3‐methylimidazole hexafluorophosphate.