JOURNAL OF CHROMATOGRAPHY A
·
2016
·
IF 3.926
Shanshan Wang,Chao Han,Sisi Wang,Lijuan Bai,Shanshan Li,Jianguang Luo,Lingyi Kong
Cu(II) complexed amino acid ionic liquid , Cu(II)-[1-butyl-3-methylimidazolium][L-Pro] (Cu(II)-[BMIm][L-Pro]), was successfully adopted as chiral ligand to improve the enantioseparation efficiency in high speed counter-current chromatography (HSCCC). For the enantioseparation of intractable naringenin (NRG) racemic mixtures, Cu(II)-[BMIm][L-Pro] coupled with hydroxypropyl-β-cyclodextrin (HP-β-CD) was successfully applied as dual chiral selectors in HSCCC. The influence of important parameters, including the concentration of the chiral selectors, the pH value, and the temperature were investigated. Under optimal conditions, 4.5 mg of (+)-NRG and 4.1 mg of (−)-NRG were successfully separated from 10 mg NRG racemic mixtures with the purity of 98%. The chiral recognition mechanism of dual chiral selectors was illuminated by the UV–vis and NMR spectra, suggesting that the enantioseparation was upon the difference of the thermodynamic stability of the quaternary complexes of Cu(II), [BMIm][L-Pro], HP-β-CD, and NRG. The results illustrated that the developed HSCCC system, based on the synergistic mechanism of Cu(II)-[BMIm][L-Pro] and HP-β-CD, exhibited better performance on enantioseparation and had great application potential in preparative chiral separation of natural products.
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FOOD CHEMISTRY
·
2018
·
IF 4.946
Li Yao,Haitao Liu,Xie Wang,Wenzhi Xu,Yongqun Zhu,Hong Wang,Liangyu Pang,Chaowen Lin
A novel ultrasound-assisted surfactant-enhanced emulsification microextraction (UASEME) using a magnetic ionic liquid (MIL) coupled with micro-solid phase extraction was developed for the preconcentration of cadmium and lead in edible vegetable oils prior to analysis by graphite furnace atomic absorption spectrometry. MIL [C 4 mim] [FeCl 4 ] was used as the extractant, non-ionic surfactant Triton X-100 as the emulsifier and Fe 3 O 4 nanoparticles as the sorbent, while ultrasound was applied to assist the dispersion of the extractant and accelerate the mass transfer process. By mixing Fe 3 O 4 nanoparticles with the MIL after UASEME, the phase separation time was shortened and the separation can be simplified by applying an external magnetic field. Under the optimized conditions, the proposed method was validated and the results demonstrated that the method can produce satisfactory linearity, sensitivity, reproducibility and recovery for the analytes. Finally, the method was successfully applied for the determination of Cd and Pb in edible vegetable oil samples.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xikun Zhang,He Zhang,Xue Lv,Ting Xie,Junzheng Chen,Di Fang,Shurui Yi
Dye wastewater poses a serious threat to the environment and human health, necessitating sustainable degradation methods. In this study, Na-based Montmorillonite (MMT) was exfoliated using different ionic liquids ([C16MIM][Cl], [C16MIM][BF 4 ], [C16MIM][PF 6 ]), and silver nanoparticles (Ag NPs) were green-synthesized using hydroxypropyl cellulose (HPC). The HPC significantly enhanced the dispersion of MMT in the hydrogel. By introducing lauryl methacrylate (LMA), a hydrophobic associative network was constructed in PAM/LMA/HPC/MMT@ILs&Ag NPs hydrogel. This hydrogel demonstrated outstanding mechanical properties, with a stress of 833.21 kPa, strain of 3300 %, and toughness of 14.36 MJ/m 3 . It also exhibited excellent catalytic activity, with a rate constant of 0.83 min −1 for 4-nitrophenol degradation at 28 °C. The effects of temperature and catalyst concentration on the catalytic reaction were systematically investigated. This study presents a simple green synthesis approach for Ag NPs using HPC, achieving superior mechanical performance and stable MMT dispersion in aqueous solutions.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-7
·
IF 5.479
Zhou Jianfeng,Sun Guohan,Pan Jianbin,Pan Yufang,Wang Sumei,Zhai Haiyun
An electrochemical sensor is described for the simultaneous determination of Cd 2+ , Cu 2+ , Hg 2+ and Pb 2+ using square wave anodic stripping voltammetry. A glassy carbon electrode (GCE) was modified with N,N-dimethyl-N-2-propenyl-2-propen-1-aminium chloride homopolymer ionic liquid doped into magnesium(II)-aluminium(III) layered double hydroxides. The morphology investigations suggest that the material possesses typical interconnected laminated micropores and a mesoporous architecture dispersed on the surface of the GCE. This accelerates mass diffusion and facilitates the deposition-stripping process of metal ions. Key operational parameters including pH, deposition potential, deposition time and the quantity of nanomaterial on the GCE were optimized. The following figures of merit for the ions Cd 2+ , Cu 2+ , Hg 2+ and Pb 2+ are obtained under optimum conditions: (a) detection limits of 250, 25, 250 and 16 ng L −1 ; (b) linear ranges from 0.5 to 20, 0.05 to 20, 0.5 to 20 and 0.05 to 20 μg L −1 , and (c) peak potentials of −768, +42, +302 and − 541 mV (vs. Ag/AgCl). The modified GCE was successfully applied to the determination of these ions in spiked black tea extract and in dried tangerine peel .
Schematic representation of novel electrochemical sensor based on a glassy carbon electrode modified with IL-Mg/Al-LDHs composites for the simultaneous detection of Pb 2+ , Cd 2+ , Cu 2+ and Hg 2+ .
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2018
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IF 3.649
Tongtong Wang,Xuedan Song,Qunxing Luo,Xiaodong Yang,Siying Chong,Jie Zhang,Min Ji
In terms of ‘green chemistry’ and ‘atom economy’, the cycloaddition of CO 2 to yield cyclic carbonate without any additive is an eco-friendly way to utilize CO 2 . Unfortunately, the low CO 2 capture quantity of common catalysts limited its catalytic efficiency. Herein, a novel acid-base bifunctional catalyst was successfully prepared by immobilizing ionic liquid on MIL-101-NH 2 (IL/MIL-101-NH 2 ) and tested for propylene carbonate (PC) rapid and facile synthesis from CO 2 and propylene oxide (PO). The synergetic interaction between Lewis base with strong CO 2 chemical capture capacity and Brønsted acid with strong hydrogen bond donor leads to the high catalytic efficiency of IL/MIL-101-NH 2 for carbonate synthesis from CO 2 and PO without any additive. The immobilization mode between MIL-101-NH 2 and IL is energetically supported by the density functional theory (DFT) calculations. This design idea of specific catalyst and the acid-base synergetic strategy provides new insights into the design of powerful catalyst systems for the CO 2 conversion.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 3
·1-14
·
IF 5.3
Zhang Yiwen,Zhao Chenyang,Yan Wen,Tian Tian,Zhao Min,Zhao Longshan
Carbon quantum dots (CQDs) were synthesized from brominated 1-hexadecyl-3-vinylimidazolium and citric acid, and a mixed-mode chromatographic (MMC) stationary phase, which can be used in the RPLC/HILIC/IEC chromatographic modes with a good separation efficiency, was successfully synthesized by click-chemistry bonding to a sulfhydryl-modified silica surface. The successful synthesis of the chromatographic stationary phase was demonstrated by its characterization. The effects of organic phase ratio, column temperature and buffer salts on the column were investigated, established the van’t Hoff equation, and verified the ion-exchange effect of the column by separating benzoic acid and phenolic compounds under different pH conditions. The reversed-phase performance of the column was characterized by Tanaka test. Compounds such as alkylbenzenes, polycyclic aromatic hydrocarbons, and nucleosides can all be separated on the column in a short period of time. The reproducibility and stability of the columns were verified under the corresponding chromatographic conditions, and the results showed good reproducibility and stability of the columns. The chromatographic column was used to separate the base nucleosides in apples, and four base nucleosides were successfully isolated from apples. Graphical
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2014
·
IF 3.107
Shuai-Shuai Hu,Ling Yi,Xing-Ying Li,Jun Cao,Li-Hong Ye,Wan Cao,Jian-Hua Da,Han-Bin Dai,Xiao-Juan Liu
An ionic liquid (IL)-based one-step micellar extraction procedure was developed for the extraction of multiclass polar analytes (protocatechuic acid, chlorogenic acid, epicatechin, hyperoside, isoquercitrin, quercetin) from hawthorn fruits and their determination using ultrahigh-performance liquid chromatography coupled with quadrupole time-of-flight tandem mass spectrometry (UHPLC-Q-TOF/MS). Compared to conventional organic solvent extractions, this newly proposed method was much easier, more sensitive, environmentally friendly, and effective as well. Several important parameters influencing the micellar extraction efficiency are discussed, such as selection of ILs, surfactant concentration, and extraction time. Under the optimal conditions, good linearity was achieved for each analyte with correlation coefficients (r2) ranging from 0.9934 to 0.9999, and the recovery values ranged from 89.3 to 106% with relative standard deviations lower than 5.5%. Results suggest that the IL-based one-step micellar extraction could be an alternative and promising means in future food analysis.
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FOOD CHEMISTRY
·
2025
·
IF 9.8
Xiaoqi Jiang,Jingcheng Huang,Mengting Li,Linjin Li,Yinuo Chen,Jiangfei Chen,Junlun Zhu,Xuedong Wang,He Mei
Detecting tetracyclines' (TC) residues is of great significance for evaluating the food and environmental safety. Herein, we pioneered a reversible-responsive ratiometric fluorometry by integrating the red fluorescence of Eu 3+ /GMP lanthanide coordination polymers (Eu 3+ /GMP LCPs) with the blue fluorescence of an anthracene-based imidazolium ionic liquid (ABIIL). In the presence of TC, the fluorescence of ABIIL was quenched by TC via the inner-filter effect and photoinduced electron-transfer process, but that of Eu 3+ /GMP LCPs was enhanced owing to the antenna effect between Eu 3+ and TC. Based on the reversible variations of the fluorescence signals, a fluorescent assay based on ABIIL-Eu 3+ /GMP LCPs was engineered to detect TC with satisfactory sensitivity and selectivity. A good linearity for TC was acquired from 0 to 50 μM with the detection limit of 3.0 nM and the significant color changes. Therefore, the assay was a promising approach for the visual detection of TC in complex media
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RSC Advances
·
2017
·Vol. 7
·期 71
·45022-45028
·
IF 3.108
Xiao-hui Liu,Qian Zhu,Yan-guang Zhang,Qiu-yan Zhang,Chen Ding,Jun Li
Ligands play a vital role in atom transfer radical polymerization (ATRP) in solubilizing the transition-metal salt and adjusting the redox potential of the metal center. In general, nitrogen ligands work particularly well for copper-mediated ATRP, while phosphorus-based ligands are rarely used due to less effectiveness. Therefore, this work aims to explore for the first time a facile, simple, and inexpensive ionic liquid (IL), 1-phenyl-3-methylimidazole diphenyl phosphate ([Phmim][Ph2PO4]), as an efficient phosphorus ligand for CuBr2-mediated reverse ATRP. The key to success is ascribed to stronger complexation of the IL ligand with the catalyst and higher solubility of the resulting complex. The polymerizations proceeded in a controlled/“living” fashion, as evidenced by first-order kinetics, linear evolution of molecular weights with monomer conversion, and narrow molecular weight distributions. Effects of various experimental parameters—solvent, reaction temperature, IL, and molar ratio of CuBr2/[Phmim][Ph2PO4]—on the polymerization were investigated in detail. Furthermore, 1H NMR analysis confirmed the halogen-containing chain-end functionality of the resultant polymer.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Jiawei Gu,Hongfei Wang,Sha Li,Muhammad Sohail Riaz,Jiqiang Ning,Xiong Pu,Yong Hu
Doping engineering in nanostructured carbon materials is an effective approach to modify heteroatom species and surface electronic structures. Herein, an advanced electrode material based on a honeycomb-like porous carbon matrix with tunable N-doped configurations is prepared via 4,4′-bipyridine (4,4′-bpy)-assisted pyrolysis of SiO 2 @ZIF-8 templates and subsequent etching treatment. Interestingly, the amounts of pyridinic-N and graphitic-N can be controlled by rationally varying the content of 4,4 ′ -bpy which acts as the N source in the pyrolysis process. Both experimental results and density functional theory calculations have revealed that synergistically with 3D interconnected porous architecture, pyridinic-N and graphitic-N have different effects on the electrochemical performances in aqueous and ionic liquid gel electrolytes for symmetric supercapacitors. Highly exposed pyridinic-N endows the carbon electrode with a strengthened pseudocapacitance contribution manifested as a high specific capacitance of 436.1 F g −1 and exceptional stability of almost 100% capacitance retention after 5000 cycles at 10 A g −1 in the KOH/polyvinyl alcohol (PVA) electrolyte. By contrast, graphitic-N is propitious for reinforced electrical double-layer capacitance contribution, reflected by a maximum energy density of 125.4 Wh kg −1 in the 1-ethyl-3-methylimidazolium tetrafluoroborate/poly(vinylidene fluoride- co -hexafluoropropylene) (EMIMBF 4 /PVDF-HFP) electrolyte. This work offers an in-depth insight into the understanding of the energy storage mechanism of N-rich carbon electrodes in different electrolyte media.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Yong Man,Zhen Yang,Yaming Sun,Wenjie Zhao,Guoqiang Xiang,Lijun He
Extraction of trace contaminants from fatty food matrices is challenging in food analysis. Herein, a new ionic liquid-based one-, two-, three-phase transition microextraction (IL-OTTPTME) was proposed to efficiently extract trace targets while simultaneously eliminating lipid co-extractives. The method performance was illustrated through the determination of chrysoidine in fatty soybean products using high-performance liquid chromatography-ultraviolet/visible detection. The strong interactions and infinite contact between IL and chrysoidine in the one-phase system ensured ultra-high extraction efficiency (∼100 %). Density functional theoretical calculations confirmed the presence of strong hydrogen bonding and π-π interactions. The formation of the three-phase system during extraction could completely eliminate lipid co-extractives. The IL-OTTPTME integrated extraction, enrichment and cleanup steps into one step, making it rapid and extremely easy to operate. The method had a wide linear range of 0.5–5000 μg/kg and low limit of detection (0.15 μg/kg). It also had satisfactory relative recoveries (95.1 %-104.0 %) and low RSDs (≤5.0 %, n = 5).
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TALANTA
·
2019
·
IF 4.916
Chenlu Wang,Wei Zhou,Xiaoyan Liao,Wenqing Li,Zilin Chen
The application of stir bar sorptive extraction (SBSE) for polar compounds has been restricted because of less choice of suitable sorbents . In this study, an ionic liquid-based organic polymer with desired anionic exchange ability and porous structure was used for extraction of polar analytes with high extraction efficiency and capacity. For improving the workability of stir bar, the polymer was immobilized onto chemically resistant poly(ether ether ketone) (PEEK) tube by covalent modification method which including a skillful functionalization process. Afterwards, a facile detachable dumbbell-shaped structure with modified PEEK tube as jacket was constructed. Due to the excellent chemical and physical strength of PEEK material and dumbbell-shaped structure, the stir bar performed remarkable stability in the SBSE process. In addition, the detachable structure allowed the elution can be accomplished directly in the insert tube of autosampler vial with small amounts of solution, which significantly enhanced the enrichment factor and simplified the operation. After coupling with HPLC-MS/MS, the prepared organic polymer modified stir bar was applied for the analysis of three chlorophenoxy acid herbicides and showed favorable extraction efficiency with enrichment factors between 198 and 206 folds. For quantitative analysis of three chlorophenoxy acid herbicides, the method has wide linear range (0.003–10 ng/mL), good linearity (R 2 ≥ 0.9958) and good reproducibility (intra-day relative standard deviation ≤ 6.16%). Furthermore, the proposed method was applied to determine chlorophenoxy acid herbicides in soil samples, the recoveries ranged from 79.4% to 97.4%, with relative standard deviation ≤ 9.3%.
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