FOOD CONTROL
·
2021
·
IF 5.548
Weiwei Cheng,Qiaoyun Zhang,Di Wu,Yuling Yang,Yan Zhang,Xiaozhi Tang
3-monochloropropane-1,2-diol (3-MCPD) is a well-known heat-produced food contaminant, which has been reported to be carcinogenic, nephrotoxic, and reproductively toxic. In this study, a facile electrochemical sensor based on nanoporous gold (NPG) capped with molecularly imprinted polymer (MIP) was constructed for the rapid and selective determination of 3-monochloropropane-1,2-diol (3-MCPD). Firstly, NPG was fabricated on the electrode through coating the glass carbon electrode (GCE) surface with NPG film to provide an ideal substrate for polymerization of the MIP membrane and improve the electrocatalysis activity of the sensor. Then, the MIP membrane was constructed on the NPG surface via self-assembly by electropolymerization to realize selective recognition of target 3-MCPD molecules. As a consequence of the combined effect of NPG and MIP, the optimized molecularly imprinted polymer/nanoporous gold/glassy carbon electrode (MIP/NPG/GCE) sensor exhibited outstanding analytical performance towards 3-MCPD with a much wider linear range from 10 −16 to 10 −7 mol/L and fairly low detection limit of 3.5 × 10 −17 mol/L (S/N = 3). Meanwhile, the constructed electrochemical sensor presented outstanding specificity, anti-interference capability, and reproducibility. In order to demonstrate practical applicability, the MIP/NPG/GCE was applied for the detection of 3-MCPD in real soy sauce and satisfactory results were obtained with recovery rates ranging from 105.90% to 107.52%.
研究领域:
食品科学
·
分析化学
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DOI
高影响因子
SOLVENT EXTRACTION AND ION EXCHANGE
·
2021
·
IF 2.513
Yifu Hu,Chuan Lu,Qi Chen,Yaoyang Liu,Yu Zhou,Caishan Jiao,Meng Zhang,Hongguo Hou,Yang Gao,Guoxin Tian
In this paper, pertraction of Nd(III) and U(VI) from nitric acid media through a flat-sheet supported liquid membrane (FSSLM) was studied by using a self-made liquid membrane device, respectively, with N, N’-dimethyl-N, N’-dioctyl-3-oxadiglcolamide (DMDODGA) diluted in 40/60 (V/V)% n-octanol/kerosene as the carrier. The effects of various factors, such as the acidity of the feed and stripping phases, neodymium concentration, uranium concentration, DMDODGA concentration are discussed. The optimized conditions for Nd(III) transport were found to be 3 M HNO3 in the feed phase, 0.5 M HNO3 in the stripping phase, 0.48 M DMDODGA in n-octanol/kerosene as the carrier. When the initial concentration of Nd(III) was 1 × 10−4 mol/L, the transport rate of Nd(III) was 86.4(±2.2)%. Compared with Nd(III), the liquid membrane was less effective in the transport of U(VI), the highest transport rate of U(VI) was 57.2 (±2.6)%.
研究领域:
化学工程
·
环境科学
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DOI
高影响因子
Inorganic Chemistry Frontiers
·
2024
·Vol. 12
·期 1
·217-230
·
IF 6.1
Jinggao Wu,Canyu Zhong,Xiaofan Chen,Jing Huang
Li3V2(PO4)3 (LVP) coated with N and S co-doped carbon (NSC) was investigated by DFT calculation, suggesting that NSC significantly enhances electronic conductivity and lowers the energy barrier to Li+ migration in comparison to LVP-embedded in pristine carbon. To experimentally confirm the theoretical prediction, three types of LVP particle embedded in N and S co-doped porous carbon (LVP@NSC) materials with various nitrogen and sulfur molar ratios (N : S = 1 : 1, 1 : 2 and 2 : 1) were prepared by a facile freeze-drying-assisted wet chemical route associated with a post-annealing process. When used as a cathode for a lithium-ion battery (LIB), the designed LVP@NSC with N : S = 1 : 2 exhibits outstanding high rate capacities of 124.4 and 107.85 mA h g−1, respectively, at 2 and 20 C in a voltage window of 3.0–4.3 V, and an ultralong cycling stability of 500 times at 20 C while retaining a reversible capacity of 100.22 mA h g−1, possibly due to its smallest charge transfer resistance and highest Li+ migration coefficient, which is in good agreement with the theoretical prediction. This work not only reveals the critical role of an interaction mechanism between NSC and LVP, but also offers great potential for high-energy density LIB applications.
研究领域:
材料科学
·
电化学
·
计算化学
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DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2013
·Vol. 20
·期 7
·1-9
·
IF 2.019
Xu Jingmei,Ren Chunli,Cheng Hailong,Ma Li,Wang Zhe
Double fluoride 2,5-bis(4-fluorophenyl)-1,3,4-oxadiazole (BFO) monomer was synthesized. Copolymerization of BFO, 2,2-bis(4-hydroxypheny)propane (bisphenol A) and 3′3-disulfonate-4′4-dichloro dipheny sulfone (SDCDPS) at different molar ratio resulted in a new poly (aryl ether sulfone) containing 1, 3, 4-oxadiazole polymers (SPAESO). The structures of monomer BFO and copolymer were confirmed by FT-IR and 1 H NMR. The TEM pictures showed that the ion clusters were formed and distributed evenly in SPAESO copolymer matrix. The sulfonated polyoxadiazole membranes exhibited excellent thermal, dimensional and oxidative stability and lower methanol diffusion coefficient. The proton conductivity of SPAESO-3 was 7.5 × 10 −2 Scm −1 at 120 °C while the methanol permeability coefficient of SPAESO-3 was only 2.23 × 10 −7 cm 2 S −1 at 25 °C. According to the comprehensive performance, the sulfonated polyoxadiazole membranes may be the alternative materials as proton exchange membrane for PEMFC at medium-high temperature operation.
研究领域:
高分子化学
·
燃料电池技术
·
功能材料科学
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DOI
高影响因子
Small
·
2023
·Vol. 19
·期 25
·2300938
·
IF 13.3
Jian Chen,Xin Pan,Xuanyu Zhang,Chen Sun,Congcong Chen,Xiaoqin Ji,Rui Chen,Lingling Mao
Chiral organic−inorganic hybrid metal halide materials have shown great potential for circularly polarized luminescence (CPL) related applications for their tunable structures and efficient emissions. Here, this work combines the highly emissive Cu 4 I 4 cubane cluster with chiral organic ligand R / S -3-quinuclidinol, to construct a new type of 1D Cu-I chains, namely Cu 4 I 4 ( R / S -3-quinuclidinol) 3 , crystallizing in noncentrosymmetric monoclinic P 2 1 space group. These enantiomorphic hybrids exhibit long-term stability and show bright yellow emission with a photoluminescence quantum yield (PLQY) close to 100%. Due to the successful chirality transfer from the chiral ligands to the inorganic backbone, the enantiomers show intriguing chiroptical properties, such as circular dichroism (CD) and CPL. The CPL dissymmetry factor ( g lum ) is measured to be ≈4 × 10 −3 . Time-resolved photoluminescence (PL) measurements show long averaged decay lifetime up to 10 µs. The structural details within the Cu 4 I 4 reveal the chiral nature of these basic building units, which are significantly different than in the achiral case. This discovery provides new structural insights for the design of high performance CPL materials and their applications in light emitting devices.
研究领域:
材料科学
·
光电
·
光子学
·
无机化学
·
有机-无机杂化材料
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DOI
高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 150
·期 5
·1230-1237
·
IF 2.372
Zeng Rong,Liu Jiachen,Ding Shunmin,Sun Ling,Wu Ling,Cao Lvxin,Qiu Jiaxiang
Abstract Designing catalysts that achieve the rates and selectivities of natural enzymes is a long-standing goal in synthetic chemistry. Herein, the carboxyl-controlled-graphene oxide supported 3-aminopropyl-triethoxysilane (GO n -APTS) heterogeneous catalyts like the class I aldolases with –NH 2 and phenolic –OH groups were developed and applied in aldol reaction. The results demonstrate that the amount of –NH 2 groups and phenolic –OH groups play important roles of activity and selectivity, respectively. The most efficiency catalyst GO 8 -APTS shows an excellent conversion of over 90% with a high aldol product selectivity of about 89%. Furthermore, the catalyst can be easily recovered and reused at least 5 times without significant loss of the reactivity. Graphic Abstract
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产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 35
·24385-24392
·
IF 3.9
Shiyu Cao,Yanhong Xiang,Qiuling Zou,Youliang Jiang,Hanzhang Zeng,Jian Li,Jianhua Wu,Xiangsi Wu,Xianwen Wu,Lizhi Xiong
To alleviate the depletion of lithium resources and improve battery capacity and rate capacity, the development of aqueous zinc-ion batteries (AZIBs) is crucial. The open channels monoclinic structure Li3V2(PO4)3 is conducive to the transfer and diffusion of guest ions, making it a promising cathode material for AZIBs. Therefore, in this study, nanoneedles and particles Li3V2(PO4)3 cathode materials for AZIBs were prepared by a hydrothermal assisted sol–gel method, and the effect of synthesized pH values was studied. XRD results show that all samples had the monoclinic structure, and the Li3V2(PO4)3 sample prepared at pH = 7 exhibits (LVP-pH7) the highest peak tips and narrowest peak widths. SEM images demonstrate that all samples have the morphology character of randomly oriented needles and irregular particles, with the LVP-pH7 sample having more needle-like particles that contribute to ion diffusion. EDS results show uniform distribution of P, V, and O elements in the LVP-pH7 sample, and no obvious aggregation phenomenon is observed. Electrochemical tests have shown that the LVP-pH7 sample exhibits excellent cycling performance (97.37% after 50 cycles at 200 mA g−1) and rate ability compared to other samples. The CV test results showed that compared with other samples, the LVP-pH7 sample had the most excellent ionic diffusion coefficient (2.44 × 10−12 cm2 s−1). Additionally, the Rct of LVP-pH7 is the lowest (319.83 Ω) according to the findings of EIS and Nyquist plot fitting, showing a decreased charge transfer resistance and raising the kinetics of the reaction.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Shijie Gu,Yingyue Cui,Kaihua Wen,Shimou Chen,Jianling Zhao
Layered lithium/manganese-rich oxides (LMR) receive much attention due to its high specific capacity (∼300 mAh g -1 ). However, the serious capacity degradation during cycling hinders the commercial application of the LMR. Herein, 3-cyano-5-fluorophenylboronic acid (CFBA) was applied as an electrolyte additive for enhancing the cycling stability of LMR at high voltage. Linear sweep voltammetry (LSV), density function theory (DFT) calculations and the initial charge d Q /d V profiles indicate that the preferential oxidation of CFBA can improve the oxidative stability of electrolyte. By adding 0.7 wt% CFBA into standard (STD) electrolyte (1 M LiPF 6 in EC :EMC:DMC = 1:1:1, by weight), the LMR/Li half-cell delivered a discharge capacity of 245 mAh g -1 with a capacity retention of 88.4% after 200 cycles at 0.5C, while only 68 mAh g -1 with 25.2% retention in STD electrolyte. Further characterizations and theoretical calculation illustrate that CFBA can effectively eliminate the harmful HF, which improve the electrochemical performance . More importantly, the CFBA participates in the formation of a thin and uniform protective cathode-electrolyte interface (CEI) film on the surface of LMR, which effectively suppresses electrolyte decomposition and protects the structural integrity of LMR.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Shuang Zhao,Lulu Lou,Shuwen Yuan,Daoyun Zhu,Fugen Wu,Zhongfei Mu
The near-infrared phosphor converted light-emitting diodes (NIR pc-LEDs) have been broadly used in the fields of night vision, biomedicine, nondestructive testing and food analysis. Over the past few years, many Cr 3+ doped NIR phosphorus has been reported. However, the realization of ultra-broad band NIR emission with high quantum efficiency remains a great challenge. Here, we report an ultra-broadband NIR emitting phosphor Li 3 Sc 1.92 (PO 4 ) 3 :0.08Cr 3+ with a full width at half maximum (FWHM) of 240 nm. The reason for the ultra-broad emission band is that the host Li 3 Sc 2 (PO 4 ) 3 provides two different kinds of ScO6 octahedral sites for Cr 3+ ions to occupy. This FWHM is better than most NIR emitting phosphors reported so far. Our research indicates that Li 3 Sc 2 (PO 4 ) 3 :Cr 3+ phosphors have great potential in night vision and NIR spectroscopy .
研究领域:
材料科学
·
光电技术
·
光子学
·
光谱学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 5
·1-9
·
IF 5.479
Chen Dan,Xu Hui
The exploration of monohydroxy polycyclic aromatic hydrocarbons and 8-hydroxy-2′-deoxyguanosine (8-OHdG) produced by oxidative stress and DNA damage is a powerful and non-invasive tool to study the health risk of exposure to polycyclic aromatic hydrocarbons (PAHs). A nanocomposite prepared from graphene oxide, poly(3,4-ethylenedioxythiophene) and polypyrrole was electrodeposited on the internal surface of a stainless-steel tube for online in-tube solid phase microextraction (IT-SPME) of 8-OHdG, 3-hydroxyphenanthrene and 1-hydroxypyrene from urine. The coating possesses excellent chemical and mechanical stability, high extraction efficiency, good resistance to matrix interference, and a long lifespan. An online IT-SPME-high performance liquid chromatography-mass spectrometry method was developed for the determination of these three metabolite biomarkers in human urine. Figures of merit include (a) enrichment factors of 30–48; (b) low limits of detection (4–41 pg·mL −1 at S/ N = 3); (c) wide linear ranges (0.05–50 ng·mL −1 ); (d) good recoveries from spiked samples (71.6–109.5%); and (e) acceptable repeatability (2.3–14.6%). The method offers the advantages of low cost, simplicity, sensitivity, rapidity and automation.
Schematic illustration of online in-tube solid phase microextraction using graphene oxide/poly(3,4-ethylenedioxythiophene)/polypyrrole composites as adsorbent in a stainless-steel (SS) tube for the enrichment and simultaneous determination of 8-hydroxy-2′-deoxyguanosine, 3-hydroxyphenanthrene and 1-hydroxypyrene prior to HPLC-MS analysis.
研究领域:
分析化学
·
环境健康
·
毒理学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ENZYME INHIBITION AND MEDICINAL CHEMISTRY
·
2019
·
IF 4.027
Yu-Heng Hu,Jie Yang,Yun Zhang,Ke-Chun Liu,Teng Liu,Jie Sun,Xiao-Jing Wang
The work is focused on the design of drugs that prevent and treat Alzheimer’s disease (AD) and its complications. A series of 3–(4-aminophenyl)-coumarin derivatives designed, synthesised, fully characterised and evaluated in vitro/vivo. The biological assay experiments showed that some compounds displayed a clearly selective inhibition for acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE). Among all compounds, compound 4m exhibited the highest AChE inhibition with an IC50 value of 0.091 ± 0.011 µM and compound 4k exhibited the highest BuChE inhibition with an IC50 value of 0.559 ± 0.017 µM. A zebrafish behaviour analyser (Zebrobox) was used to determine the behavioural effects of the active compound on the movement distance of the aluminium chloride-induced zebrafish. Compound 4m offered a potential drug design concept for the development of therapeutic or preventive agents for AD and its complications.
研究领域:
药理学
·
神经科学
·
药物设计
✓ 已验证
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Dongmei Wu,Jiaqi Zheng,Weiwei Hu,Xiaoliang Zheng,Qiaojun He,Robert J. Linhardt,Xingqian Ye,Shiguo Chen
Rhamnogalacturonan I (RG-I) pectin are regarded as strong galectin-3 (Gal-3) antagonist because of galactan sidechains. The present study focused on discussing the effects of more structural regions in pectin on the anti-Gal-3 activity. The water-soluble pectin (WSP) recovered from citrus canning processing water was categorized as RG-I pectin. The controlled enzymatic hydrolysis was employed to sequentially remove the α-1,5-arabinan, homogalaturonan and β-1,4-galactan in WSP. The Gal-3-binding affinity KD (kd/ka) of WSP and debranched pectins were calculated to be 0.32 μM, 0.48 μM, 0.56 μM and 1.93 μM. Moreover, based on the more sensitive cell line (MCF-7) model, the IC 30 value of WSP was lower than these of modified pectins, indicating decreased anti-Gal-3 activity. Our results suggested that the total amount of neutral sugar sidechains, the length of arabinan and cooperation between HG and RG-I played important roles in the anti-Gal-3 activity of WSP, not the Gal/Ara ratio or RG-I/HG ratio. These results provided a new insight into structure-activity relationship of citrus segment membrane RG-I as a galectin-3 antagonist and a new functional food.
研究领域:
食品科学
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）