ACS Applied Materials & Interfaces
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2016
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IF 7.145
Zhigang Liu,Yi Wang,Rong Deng,Liyuan Yang,Shihua Yu,Shuping Xu,Weiqing Xu
A multifunctional magnetic graphene surface-enhanced Raman scattering (SERS) substrate was fabricated successfully by the layer-by-layer assembly of silver and graphene oxide (GO) nanoparticles (NPs) on the magnetic ferroferric oxide particles (Fe3O4@GO@Ag). This ternary particle possesses magnetic properties, SERS activity, and adsorption ability simultaneously. Owing to the multifunction of this Fe3O4@GO@Ag ternary complex, we put forward a new method called a surface magnetic solid-phase extraction (SMSPE) technique, for the SERS detections of pesticide residues on the fruit peels. SMSPE integrates many sample pretreatment procedures, such as surface extraction, separation sample, and detection, all-in-one. So this method shows great superiority in simplicity, rapidity, and high efficiency above other standard methods. The whole detection process can be finished within 20 min including the sample pretreatment and SERS detection. Owing to the high density of Ag NPs, the detection sensitivity is high enough that the lowest detectable concentrations are 0.48 and 40 ng/cm2 for thiram and thiabendazole, which are much lower than the maximal residue limits in fruit prescribed by the U.S. Environmental Protection Agency. This multifunctional ternary particle and its corresponding analytical method have been proven to be applicable for practical samples and also valuable for other surface analysis.
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高影响因子
MICROCHIMICA ACTA
·
2017
·
IF 4.58
Song Han,Xue Guipeng,Zhang Junjie,Wang Gang,Ye Bang-Ce,Sun Shiguo,Tian Liping,Li Yingchun
The authors describe an electrochemical sensor for simultaneous determination of dopamine (DA) and uric acid (UA). The sensor is based on the use of composite materials of carbon-encapsulated hollow magnetite (Fe 3 O 4 ) nanoparticles and graphene oxide nanosheets, which were homogeneously deposited on a glassy carbon electrode. The morphology of the materials was characterized by transmission electron microscopy and scanning electron microscopy, and the properties of differently decorated electrodes were investigated via cyclic voltammetry and differential pulse voltammetry (DPV). Simultaneous detection of DA and UA was carried out via DPV, and the potentials of electrooxidation peaks are 0.14 V and 0.27 V (vs. SCE) for DA and UA, respectively. The calibration plot is linear from 0.1 to 150 μM for DA, and from 1.0 to 100 μM for UA, with detection limits of 0.053 μM and 0.41 μM at an S/N ratio of 3. The method was applied to the quantification of DA and UA in brain tissue, urine and whole blood.
Schematic of an electrochemical sensor for simultaneous voltammetric determination of dopamine (DA) and uric acid (UA) using 3D carbon-encapsulated hollow Fe 3 O 4 nanoparticles (H-Fe 3 O 4 @C) anchored on graphene nanosheet (GNS) modified glassy carbon electrode (GCE).
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Coatings
·
2024
·Vol. 14
·期 4
·439
·
IF 2.9
Xi Quan,Pengzhao Lv,Linlin Yin,Wei Zuo,Yu Tian,Jun Zhang
This study presents a detailed investigation into the use of β-cyclodextrin (β-CD) encapsulated iron oxide nanoparticle (β-CD@Fe3O4) composites, modified with different ligands, to activate peroxymonosulfate (PMS) for the degradation of pharmaceutical contaminants, namely, diclofenac, carbamazepine, and erythromycin. The focus is on understanding the ligand effect, particularly using citric acid (CIT), polyethyleneimine (PEI), and cetyl trimethyl ammonium bromide (CTAB), on the degradation performance of these composites. Employing density functional theory (DFT) calculations, this work examines the electronic structure and charge distributions of β-CD@Fe3O4composites, providing insights into their interaction with various pollutants. The study reveals that the β-CD@PEI@Fe3O4composite demonstrates superior degradation efficiency due to optimal electrostatic interactions, regardless of the pollutant’s hydrophobicity. On the other hand, β-CD@CIT@Fe3O4shows moderate efficiency, and β-CD@CTAB@Fe3O4exhibits selective efficiency, particularly for hydrophobic compounds. These findings underscore the significant role of surface chemistry in modulating the activation of PMS and the degradation of contaminants, opening avenues for designing tailored β-CD composites for environmental remediation.
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BIOELECTROCHEMISTRY
·
2024
·
IF 4.8
Zhihao Xu,Zhixiang Lv,Huijiao Yang,Jiashuo Zhang,Zijie Sun,Dawei He,Ruijiang Liu
A label-free electrochemical DNA detection strategy based on self-assembled α-Fe 2 O 3 /Fe 3 O 4 nanosheets with PNA-DNA hybridization process was developed for ultrasensitive detection of APOE ε4 gene, one of the most robust genetic risks for Alzheimer’s Disease (AD). In this work, magnetic α-Fe 2 O 3 /Fe 3 O 4 heterogeneous nanosheets were prepared by hydrothermal-calcined reduction method and loaded with Au nanoparticles (AuNPs) on their surfaces. The magnetic α-Fe 2 O 3 /Fe 3 O 4 @Au nanocomposites significantly enhanced the electrochemical response as a signal amplification matrix and were able to bind to the magnetic glassy carbon electrode (MGCE) surface by magnetic self-assembly. Moreover, owing to the high specificity and stable binding capacity of PNA with respect to the target DNA, the biosensor not only enabled accurate (the limit of detection was estimated to be 0.147 pM) and rapid detection of the APOE ε4 gene, but also exhibited excellent specificity, stability and regeneration capability. Additional, the satisfactory recoveries were also obtained in real samples of human serum, ranging from 92.83 % to 106.22 % with relative standard deviation (RSD) between 0.25 % and 1.85 %. The results possessed important reference value for exploring the application of DNA biosensor technology in the diagnosis of APOE gene mutation.
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PROGRESS IN ORGANIC COATINGS
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2024
·
IF 6.5
Wenli Bao,Yuanjun Liu,Xiaoming Zhao
To solve the problem of electromagnetic radiation pollution, it is especially important to develop electromagnetic wave-absorbing materials with excellent performance. The preparation of composite multifunctional textile materials with excellent wave-absorbing properties is one of the research hotspots for practical personal protection applications. In this work, PPy/Fe 3 O 4 /rGO polyester/cotton composite fabrics were prepared by impregnation, chemical reduction, chemical co-precipitation and in situ polymerization. When the thickness is 0.97 mm, the minimum reflection loss ( RL min ) of PPy/Fe 3 O 4 /rGO polyester/cotton composite fabric is −12.12 dB, and the effective absorption bandwidth (EAB) is 4.7 GHz, which is excellent in wave absorption. Meanwhile, the PPy/Fe 3 O 4 /rGO polyester/cotton composite fabrics have excellent UV resistance (UV transmittance ratio of UVA and UVB bands as low as 0.02 %, UPF value of 100+), antistatic properties (static voltage half-life of 0.2 s), and excellent thermal management properties (thermal conductivity as low as 0.05796 W/(m·K)), and so on. The PPy/Fe 3 O 4 /rGO polyester/cotton composite fabrics prepared in this study are suitable for a variety of application scenarios, such as individual electromagnetic protection, individual protection in extremely cold environments, and individual heating physiotherapy, which is of great reference significance for the research of wearable individual protective textile materials.
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JOURNAL OF SEPARATION SCIENCE
·
2017
·Vol. 41
·期 7
·1539-1547
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IF 2.557
Xinyu Liang,Ruiyang Ma,Lin Hao,Chun Wang,Qiuhua Wu,Zhi Wang
In this work, a magnetic β-cyclodextrin polymer was successfully prepared and used as an adsorbent for the magnetic solid-phase extraction of six benzoylurea insecticides (diflubenzuron, triflumuron, hexaflumuron, teflubenzuron, flufenoxuron, and chlorfluazuron) from honey, tomato, and environmental water samples. The influence of the main experimental conditions on the extraction was studied. Under the optimized conditions, the β-cyclodextrin polymer@Fe 3 O 4 showed an excellent extraction performance for the benzoylurea insecticides. A good linearity was obtained for the analytes in the range of 3.0–800 ng/g for honey samples, 0.3–160 ng/g for tomato samples, and 0.1–80.0 ng/mL for water samples, with the correlation coefficients above 0.9998. Satisfactory repeatabilities were achieved, with the relative standard deviations less than 5.7%. The limits of detection (S/N = 3) of the method for the benzoylurea insecticides were 0.2–0.8 ng/g for honey samples, 0.04–0.10 ng/g for tomato samples, and 0.02–0.05 ng /mL for water samples. The method was successfully used for the determination of the six benzoylurea insecticides residues in honey, tomato, and environmental water samples with a satisfactory result.
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JOURNAL OF FOOD SCIENCE
·
2024
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IF 3.2
Juan Du,Zongshuang Li,Jiangli Guo,Kaidong Du,Zhijian Chen,Yanhong Bai
In this study, a pretreatment method based on a magnetic capture probe for the rapid isolation and enrichment of bacteria from raw pork was developed. The chitosan immobilized Fe 3 O 4 @MIL-100(Fe) was prepared as a capture probe for total bacterial counts through the electrostatic interaction of positively charged chitosan and the negatively charged substances on the surface of bacteria. The interference of matrix in pork samples on this method was studied and removed by differential centrifugation. The results showed the capture probe had a great selectivity binding and magnetic separation properties for the tested six common bacteria in pork. Under the optimal conditions, the capture efficiency of the bacteria (10 5 CFU mL −1 ) from pork surface samples was all above 90%. The capture efficiency of the bacteria in a homogenate system was greatly decreased due to the interference of sarcoplasmic protein and myofibrillar protein in pork. The matrix effect was mitigated by a differential centrifugation method, and the capture efficiency of all six bacteria was >80%. The developed magnetic separation method took 40 min and showed good isolation and enrichment properties of bacteria. Thus, the proposed method is expected to provide a simple, convenient, and time-saving pretreatment method for the detection of total bacterial counts in pork.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Huanan Guan,Yanyu Chen,Yue Xue
The self-assembly approach has successfully been used to generate Fe 3 O 4 @Pt, a material that can mimic peroxidase . The material was created by modifying the surface of Fe 3 O 4 nanoparticles (Fe 3 O 4 NPs) with -NH 2 functional groups using 3-Aminopropyltriethoxysilane (APTES), and then using the coordination between platinum ions and -NH 2 on the surface of magnetic particles to reduce platinum ions to the surface of magnetic particles under ultrasonic conditions to produce Fe 3 O 4 @Pt composite nanoparticles . The Fe 3 O 4 @Pt core-shell composite material not only has the inert metal Pt to protect Fe 3 O 4 to improve the stability of Fe 3 O 4 in the biological matrix, but also has the high catalytic activity of Fe 3 O 4 and Pt. The catalysts were characterized, and the findings revealed that they were non-homogeneous Fenton catalysts with high dispersion, uniform particle size, and a large specific surface area . Since a large number of free radicals generated during the catalysis of Fe 3 O 4 @Pt mimic enzyme can trigger the Fenton reaction, tetracycline (TC) and oxytetracycline (OTC) were chosen as target substances, and a system for the combined degradation of tetracyclines pollutants by mimic enzyme and Fenton reaction was established, and the catalytic mechanism of this system has been investigated. The findings indicate that by using a concentration of 0.25 mol/L of H 2 O 2 , a catalyst amount of 1.5 g/L, a reaction time of 50 min, and a reaction temperature of 50°C, the degradation rate of TC and OTC can exceed 97 %, following first-order degradation kinetics. Under ideal conditions, over 95 % of each tetracyclines was degraded in the simulated food processing wastewater, effectively achieving tetracyclines degradation in the actual wastewater. In addition, the reusability of the recovered Fe 3 O 4 @Pt mimetic enzyme was investigated. The findings indicated that the Fe 3 O 4 @Pt mimetic enzyme has exceptional activity, stability, and reproducibility. The combination of the Fenton reaction with the Fe 3 O 4 @Pt mimetic enzyme can expedite the degradation of tetracyclines, offering a novel approach for eliminating recalcitrant contaminants in wastewater.
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 10
·4133-4140
·
IF 4.58
Xu Kaijia,Wang Yuzhi,Zhang Hongmei,Yang Qin,Wei Xiaoxiao,Xu Panli,Zhou Yigang
A magnetically responsive composite was prepared for improved solid-phase extraction of salmon sperm DNA sodium salt. It consists of chitosan-modified Fe 3 O 4 -magnetized multi-walled carbon nanotubes coated with a poly(ethylene glycol) based deep eutectic solvent. The sorbent was characterized by X-ray diffraction, vibrating sample magnetometry, Fourier transform infrared spectrometry, thermogravimetric analysis and transmission electron microscopy. The effects of the concentration of DNA, ionic strength, pH value, temperature and extraction time on extraction performance were optimized. Compared to plain Fe 3 O 4 , the new sorbent displays a superior DNA extraction capacity of 178 mg·g −1 . It also displays favorable selectivity for DNA over bovine hemoglobin. Regeneration studies show that (a) 79% of DNA can be eluted from loaded sorbent by using 1 M NaCl, and that (b) the conformation of DNA remains unchanged as evidenced by CD spectra. The sorbent can be recycled six times without significant loss of extraction capacity. It was applied to the extraction of DNA from bovine whole blood prior to DNA quantitation by agarose gel electrophoresis. The results show this new sorbent to be a viable material for separation of DNA that excels by its low cost, high loading capacity and ease of regeneration.
Chitosan (CS)-modified magnetic multi-walled carbon nanotubes were coated with a poly(ethylene glycol)-based deep eutectic solvent (DES) to obtain a new material (referred to as DES-mCS/MWCNTs) for solid-phase extraction of DNA. It exhibits excellent magnetic response, high loading capacity and good reusability.
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ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Nan Zhang,Shuangming Guo,Yaxiling Wang,Chunyuan Zhu,Peiwen Hu,Hong Yang
Background Presently, glyphosate (Gly) is the most extensively used herbicide globally, Nevertheless, its excessive usage has increased its accumulation in off-target locations, and aroused concerns for food and environmental safety. Commonly used detection methods, such as high-performance liquid chromatography and gas chromatography , have limitations due to expensive instruments, complex pre-processing steps, and inadequate sensitivity. Therefore, a facile, sensitive, and reliable Gly detection method should be developed. Results A photoelectrochemical (PEC) sensor consisting of a three-dimensional polymer phenylethnylcopper/nitrogen-doped graphene aerogel (PPhECu/3DNGA) electrode coupled with Fe 3 O 4 NPs nanozyme was constructed for sensitive detection of Gly. The microscopic 3D network of electrodes offered fast transfer routes for photo-generated electrons and a large surface area for nanozyme loading, allowing high signal output and analytical sensitivity. Furthermore, the use of peroxidase-mimicking Fe 3 O 4 NPs instead of natural enzyme improved the stability of the sensor against ambient temperature changes. Based on the inhibitory effect of Gly on the catalytic activity Fe 3 O 4 NPs, the protocol achieved Gly detection in the range of 5 × 10 −10 to 1 × 10 −4 mol L −1 . Additionally, feasibility of the detection was confirmed in real agricultural matrix including tea, maize seedlings, maize seeds and soil. Significance This work achieved facile, sensitive and reliable analysis towards Gly, and it was expected to inspire the design and utilization of 3D architectures in monitoring agricultural chemicals in food and environmental matrix.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Caiyu Ge,Yuefan Wang,Yilin Wang,Zhifang Liu,Chao Chen,Yixi Xie,Pengcheng Zhao,Junjie Fei
As a natural flavonoid compound found in fruits, vegetables and herbs, luteolin (LU) has potent pharmacological activities and beneficial biological properties. Here, a Fe/Zn bimetallic ZIF pyrolysis-derived Fe-Fe 3 O 4 N-doped mesoporous carbon was in-situ grown on carbon nanofibers (Fe-Fe 3 O 4 -NPC@CNFs), and it was used as an ultrasensitive electrochemical sensing platform for the efficient detection of LU in natural samples. Multiple characterization results show that Fe-Fe 3 O 4 -NPC@CNFs is a dodecahedral particle uniformly grown on CNFs with good crystal structure and uniform elemental distribution. Its rough surface with good mesoporous structure and high specific surface area of 823.19 m 2 /g is beneficial for LU adsorption. The density of states (DOS) and adsorption energies of NPC and Fe-Fe 3 O 4 -NPC further demonstrate that Fe-Fe 3 O 4 -NPC has better electrochemical performance and adsorption effect on LU. Under optimized conditions (carbonization: 800℃, pH: 5.0, enrichment: −0.2 V for 400 s), the Fe-Fe 3 O 4 -NPC@CNFs/GCE sensor showed satisfactory detection performance for LU in the range of 0.001–1.5 μM with the limit of detection (LOD) of 0.47 nM. Furthermore, this sensor exhibits excellent anti-interference capability, reproducibility, and stability, and it was also possible to effectively detect LU in food samples. This work provides a new strategy for the quantitative analysis of LU in food.
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Food Science & Nutrition
·
2022
·Vol. 10
·期 7
·2224-2235
·
IF 3.553
Zhentao Tang,Qingrong Han,Gang Yu,Fei Liu,Yuzhu Tan,Cheng Peng
Magnetic solid-phase extraction (MSPE) strategy based on the Fe 3 O 4 @PDA/MIL-101(Cr) has been proposed to separate and purify five common mycotoxins in licorice, including aflatoxin B 1 , aflatoxin G 1 , sterigmatocystin, zearalenone, and ochratoxin A. Integrating the MSPE and solid–liquid extraction/partitioning, a modified QuEChERS was established to adapt to the complex licorice samples. The Fe 3 O 4 @PDA/MIL-101(Cr) was successfully synthesized and characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and nitrogen adsorption–desorption isotherms. Sorbents with superior advantages for exclusion of matrix interference and extraction of target analytes in a short time were obtained, according to their ability of magnetic separation, high surface area (287.75 m 2 /g), large pore volume (0.61 cm 3 /g), and nanosized structure with mesopores. Prior to analysis with ultrahigh-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS), several key parameters that would affect the sorbents’ extraction efficiency were extensively investigated. Under the optimized conditions, the practicality of the developed method for analysis of mycotoxins in licorice samples was confirmed by adequate linearity ( R 2 ≥ 0.9967), high sensitivity (LODs and LOQs, respectively, in the ranges 0.01–0.09 and 0.02–0.30 μg/kg), acceptable recovery (78.53%–116.28%), satisfactory reusability, and good interbatch precision of the sorbents (RSDs in the ranges 6.70%–11.20% and 6.02%–10.35%, respectively). The results indicated that the established method was feasible and reliable for the environment-friendly and rapid screening of mycotoxins in complex licorice samples.
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危险品化学品经营许可证（带存储）