RSC Advances
·
2014
·Vol. 4
·期 63
·33466-33473
·
IF 3.708
Qing Wang,Zhi Min Wu,Yongfei Li,Ying Tan,Ning Liu,Yuejin Liu
The efficient hydroxyalkylation of phenol with formaldehyde to bisphenol F over a thermoregulated phase-separable reaction system containing a water-soluble Brønsted acidic ionic liquid was studied. The reaction system containing the water-soluble IL showed thermoregulated biphasic behavior with change of the alkyl chain length of IL, temperature and water amount. Four types of imidazolium-, ammonium-, phosphonium- and pyridinium-based water-soluble ionic liquids with different anions of dihydrogen phosphate [H2PO4]−, acetate [CH3COO]− and hydrogen sulfate [HSO4]− were used as both Brønsted acidic catalysts and thermoregulated solvents. Among them, [C6MIM][HSO4] gave a high yield of 80.5% and a selectivity of 96.9% for bisphenol F, and the optimal reaction conditions were stirring speed 450 rpm, phenol–formaldehyde ratio 6 : 1, IL catalyst molar concentration 12.5%, reaction temperature 90 °C and reaction time 1 h. [C6MIM][HSO4] could be recovered by simple decantation and could retain its original activity even after six recycling-uses [CnMIM][HSO4] with the alkyl chain length n = 6 found to be the most suitable for the synthesis of bisphenol F because of both the formation of a thermoregulated monophasic reaction system at 90 °C to enhance the reaction efficiency and as a thermoregulated phase-transition solvent to facilitate its recovery from the reaction system.
研究领域:
化学工程
·
催化反应
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Fen-Ying Kong,Sai-Xi Gu,Jing-Yi Wang,Hai-Lin Fang,Wei Wang
We demonstrate herein a newly developed electrochemical sensor base on the reduced graphene oxide–titanium nitride (RGO–TiN) nanohybrid . The nanohybrid was prepared by mixing the TiN nanoparticles and GO dispersion and then treating with glucose and Zn foils. The morphologies and microstructures of the as-prepared nanohybrid were characterized by UV–vis absorption spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy and Raman spectroscopy. The as-prepared RGO–TiN nanohybrid exhibited excellent electrocatalytic activity toward the simultaneous detection of acetaminophen (ACOP) and 4-aminophenol (4-AP). As a result, the linear detection ranges were 0.06–660 μM for ACOP and 0.05–520 μM for 4-AP, respectively, with the low detection limits of 0.02 μM for ACOP and 0.013 μM for 4-AP. Based on the excellent performance, it was demonstrated that the prepared RGO–TiN nanohybrid was a promising candidate for advanced electrode material in electrochemical sensing field and the as-prepared RGO–TiN nanohybrid may find more applications for the detection of various analytes.
研究领域:
材料科学
·
分析化学
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DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2017
·
IF 3.086
Xiaoqin Wang,Qiumei Zeng,María del Mar Contreras,Lijuan Wang
In Asia, tea seed oils (seed oils from Camellia oleifera , C. chekiangoleosa , and C. sinensis ) are used in edible, medicinal, and cosmetic applications. However, these oils differ in their fatty acid contents, and there is little known about their phenolic compounds . Here we analyzed the phenolic compounds of seed oils from three species gathered from 15 regions of China. Twenty-four phenolic compounds were characterized by HPLC-Q-TOF-MS, including benzoic acids (6), cinnamic acids (6), a hydroxyphenylacetic acid, flavanols (4), flavonols (3), flavones (2), and dihydroflavonoids (2). Some of these phenolic compounds had not previously been reported from C. sinensis (20), C. oleifera (15), and C. chekiangoleosa (24) seed oils. Quantification was done by HPLC-QqQ-MS using 24 chemical standards. The total concentrations in the studied samples ranged from 20.56 to 88.56 μg/g. Phenolic acids were the most abundant class, accounting for 76.2–90.4%, with benzoic acid, found at up to 18.87 μg/g. The concentration of catechins, typical of tea polyphenols, ranged between 2.1% and 9.7%, while the other flavonoids varied from 4.2% to 17.8%. Although the cultivation region affected the phenolic composition of the Camellia seed oils, in our hierarchical clustering analysis, the samples clustered according to species. The phenolic composition of the seed oils from C. oleifera and C. chekiangoelosa were similar. We found that the phenolic categories in Camellia seed oils were similar to tea polyphenols, thereby identifying a source of liposoluble tea polyphenols and potentially accounting for some of the reported activities of these oils. In addition, this work provides basic data that allows distinction of various Camellia seed oils, as well as improvements to be made in their quality standards.
研究领域:
植物化学
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食品科学
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分析化学
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DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2018
·
IF 2.732
YaoYao Qu,Guojuan Ren,Liying Yu,Baoya Zhu,Fang Chai,Lihua Chen
Herein, the fluorescent carbon dots (CDs) has been synthesized by hydrothermal method by using ethylene diamine tetraacetic acid (EDTA) as a raw materials. The prepared CDs exhibited bright blue fluorscence excited by 340 nm with the quantum yield as high as 52%. The CDs possess special fluorescence responses to 2-nitrophenol (2-NP) and 4-nitrophenol (4-NP), and the slump of fluorescence was demonstrated by CDs solution in the case of 2-nitrophenol and 4-nitrophenol existence. The detection limit of 2-NP and 4-NP was calculated at 77 nM and 60 nM, respectively. Meanwhile, the color response to 2-NP and 4-NP can be observed from achromatic solution to yellow by naked eye. All in all, the obtained CDs can be applied as fluorescence and colorimetric probe in environmental protection.
研究领域:
环境科学
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分析化学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Xiaoxue Liu,Jiao Yang,Jing Cheng,Yi Xu,Wen Chen,Yingchun Li
Development of nanomaterials with multienzyme-like activities (nanozymes) via a simple way has attracted paramounting attention. Generally, enzymatic activity is closely related to the size, surface state, material type, etc. Bimetallic oxides are very appealing owing to their mixed valence and structural advantages. Herein, we reported an eco-friendly strategy to synthesize Co 1.5 Mn 1.5 O 4 nanozyme via sol-gel method. This nanozyme functionally mimics four major enzymes, i.e. laccase, peroxidase (POD), oxidase (OXD), and catalase (CAT). Accordingly, a colorimetric sensing platform was designed to distinguish isomers of organic pollutants ‒catechol (CC) and hydroquinone (HQ) by using Co 1.5 Mn 1.5 O 4 as the sole catalyst. In particular, laccase-like activity of Co 1.5 Mn 1.5 O 4 enables it to directly oxidize CC into yellow o -benzoquinone with good linearity in the range of 1∼1000 μM and a detection limit of 0.35 μM. Meanwhile, HQ can discolor the oxidized substrate that was pre-oxidized with the aid of oxidase-like activity of the nanozyme (linear range: 0.05∼100 μM, detection limit: 0.04 μM). The established colorimetric method has been successfully utilized for selective sensing of CC, HQ in water samples with good selectivity and high sensitivity. Our study contributes to green synthesis of metal-based nanomaterials with multi-enzyme mimicking activities and uncovers new usage of nanozyme in discriminating of environmental pollutants.
研究领域:
环境科学
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生物化学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2023
·Vol. 170
·期 7
·077512
·
IF 3.9
Jinjin Zhang,Wenjing Liu,Qi Wang,Jianying Qu
In this paper, composites of Ti3C2/ZIF-8/ZIF-67 were obtained through in situ growing ZIF-8/ZIF-67 on Ti3C2 with two-dimensional structure prepared by etching MXene using HF. Furtherly, novel materials of Ti3C2 modified with hollow polyhedrons composed of Co nanoparticles and N-doped carbon nanotube (Ti3C2/CoNP-NCNTHP) was got through derivation with high temperature calcination. The materials were combinations of two-dimensional nanosheets and three-dimensional hollow polyhedras, which were characterized by SEM, TEM, XRD, XPS and EIS. Based on this, a new electrochemical sensor of Ti3C2/CoNP-NCNTHP/GCE was constructed to detect paracetamol (PA) and 4-aminophenol (4-AP) simultaneously. Under optimal conditions, the linear ranges for detection of PA and 4-AP were 0.50–350.00 μM and 0.50–200.00 μM with the limits of detection of 0.05 μM and 0.07 μM, respectively. This proposed sensor has lower detection limits and good linear ranges, which was successfully applied for river water and acetaminophen tablets with good accuracy and has potential prospects for practical applications.
研究领域:
材料科学
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分析化学
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产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 14
·B1293
·
IF 3.12
Yu Zhang,Qiang Xie,Zhi Xia,Guofeng Gui,Feng Deng
In this paper, a novel nanocomposite fulvic acid reduced graphene oxide (FA-rGO) and Co-phthalocyanine nanorods (CoPcNRs) was prepared and used to construct an electrochemical sensor for simultaneous detection of catechol (CC), hydroquinone (HQ), phenol (PN) and p-nitrophenol (p-NP). FA as reductant used to prepare FA-rGO nanocomposite, which fabricated by hydrothermal method and freeze-drying process. The method is environmentally friendly and realizes the gentle reduction of GO. CoPcNRs were synthesized by surfactant-assisted ultrasonic method. The microstructure and morphologies of the as-prepared materials were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and UV-Vis spectrophotometer. The electrochemical oxidation of CC, HQ, PN and p-NP was investigated using differential pulse voltammetry (DPV). The results show that the FA-rGO/CoPcNRs modified electrode exhibits excellent electrochemical activity toward the simultaneous redox of CC, HQ, PN and p-NP. Under optimal conditions, the linear ranges of CC, HQ, PN and p-NP were 1 μM–650 μM, 2 μM–450 μM, 2 μM–160 μM, 2 μM–140 μM, with 0.3 μM, 0.65 μM, 0.65 μM and 0.65 μM, respectively. In addition, the modified electrode showed good selectivity, sensitivity and stability. The application in real samples was also evaluated, and the recoveries suggesting that FA-rGO/CoPcNRs nanocomposites could be used as an excellent potential reaction platform for the simultaneous determination of CC, HQ, PN and p-NP in environmental samples.
研究领域:
环境科学
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材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
Environmental Science-Nano
·
2016
·Vol. 3
·期 4
·857-868
·
IF 5.896
Yunrong Dai,Jun Yao,Yonghui Song,Siyu Wang,Yu Yuan
Multi-walled carbon nanotube modified laccase-carrying electrospun fibrous membranes (MWCNTs-LCEFMs) were fabricated via co-electrospinning a poly(D,L-lactide) (PDLLA)/laccase/MWCNT mixed solution. A triblock copolymer PEO–PPO–PEO (F108) was added as an emulsifier to promote the dispersion of the laccase and acid-treated short MWCNTs in the electrospinning solution. The characterization results illustrated that the electrospun nanofibers possess a feature of being bead-free, porous and having a core–shell structure, with active laccase encapsulated inside the fibers and one end of some MWCNTs inserted into the edge of the pores. After being modified by a small amount (1.5 wt%, vs. PDLLA) of MWCNTs, the specific surface area and mechanical tensile strength of MWCNTs-LCEFMs were enhanced by about 2 and 3 times compared to those of LCEFMs, respectively. The MWCNTs-LCEFMs were applied to remove the widespread phenolic organics from water, including bisphenol A (BPA), triclosan (TCS) and 2,4-dichlorophenol (2,4-DCP). Benefiting from the improved adsorption property for substrates and the promoted electron transfer in the laccase-catalytic reaction, the MWCNTs-LCEFMs showed higher activity recovery (88.9% vs. free laccase), and better storage and operational stability than LCEFMs. In addition, the adsorption efficiencies of MWCNTs-LCEFMs for BPA and 2,4-DCP were enhanced by more than 50%. The removal efficiencies of MWCNTs-LCEFMs for 2,4-DCP, BPA and TCS reached 92.6 ± 0.74%, 95.5 ± 0.46% and 99.7 ± 0.02%, respectively, with the degradation efficiencies reaching 81.7 ± 1.9%, 90.5 ± 1.1% and 85.6 ± 1.5%, respectively. Meanwhile, the removal half-life (t1/2) of 2,4-DCP, BPA and TCS by the MWCNTs-LCEFMs was shortened to 7.9 ± 0.07, 4.7 ± 0.04 and 0.76 ± 0.01 min, respectively. The removal mechanism of these phenolic pollutants by MWCNTs-LCEFMs was considered as a synergistic effect of membrane adsorption and laccase degradation, where the catalytic degradation of laccase was obviously strengthened by the improved adsorption (pre-concentration) process of the fibers and MWCNTs, and the enhanced electron transfer process of MWCNTs.
研究领域:
环境科学
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材料科学
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生物技术
·
水处理
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产品关联
DOI
高影响因子
Food Additives and Contaminants Part A-Chemistry Analysis Control Exposure & Risk Assessment
·
2022
·
IF 3.549
Jiaze Yan,Shaomin Ma,Mingrui Feng,Jiqi Zheng,Ming Guo
The use of deep eutectic solvents (DESs) has great prospects because of the green and efficient characteristics, which can be used for developing analytical methods for foods. In this research, assisted by ultrasonic waves, a liquid-liquid microextraction detection method combined with gas chromatography was established for three anaesthetics (eugenol, isoeugenol, and methyl isoeugenol) in aquatic food. The processing conditions including the components, ratio of hydrogen bond acceptor and hydrogen bond donor, DES volume, ultrasonic time, and pH were evaluated and optimised to improve the extraction efficiency, which was based on the DES structures and properties. In-house method validation was carried out by applying to real samples. A Thymol: levulinic acid DES (with a molar ratio of 1:2) was used as the extractant and the recoveries were as high as 93–101% for eugenol, 90–100% for methyl isoeugenol, and 86–94% for isoeugenol with RSDs <5% under optimum conditions. The limit of detection and quantification of the eugenol compounds were 0.08–0.10 μg/mL and 0.26–0.33 μg/mL, respectively. The method has green credentials and comparable LOD to homologous apparatus, which can be used for the determination of eugenol components in aquatic food.
研究领域:
食品科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 16
·48248-48259
·
IF 5.8
Pan Zewen,Tang Changyuan,Cao Yingjie,Xuan Yingxue,Zhou Qianyi
The sources and distribution characteristics of three phenolic endocrine-disrupting compounds (EDCs), e.g., alkylphenols (APs) (including nonylphenols (NPs) and 4-t-octylphenol (OP)) and Bisphenol A (BPA), were investigated in the rivers of the Pearl River Delta Region (PRDR) with complex land-use types. The mean concentrations of NPs, OP, and BPA in river water including wet and dry seasons were 87, 6, and 74 ng/L in the agricultural regions ( n = 10), 135, 7, and 61 ng/L in the transitional regions ( n = 8), and 249, 15, and 152 ng/L in the urban regions ( n = 28). Contents of NPs and BPA were high in the river sediments (ranged from 7 to 3048 ng/g and 2 to 271 ng/g, respectively). Equilibrium analysis results suggested that sediment release was not the main source of the river EDCs. Principal component analysis (PCA) showed that sewage was the major source of EDCs in the dry season, while the leaching effect of rainfall on the agricultural soils, urban roads, and commercial products was an important source in the wet season. Furthermore, the ratio of APs and total concentration of phenolic EDCs (ΣEDCs) was used to characterize the agricultural regions and urban regions in the PRDR. The ratio was less than 0.6 in the agricultural regions while the ratio was large than 0.6 in the dry season and less than 0.6 in the wet season in urban regions. BPA and NPs in transitional region and urban region had small/medium potential risk to aquatic organisms.
研究领域:
环境科学
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化学工程
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水资源管理
·
生态毒理学
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产品关联
DOI
PubMed
高影响因子
Journal of Food Measurement and Characterization
·
2020
·Vol. 15
·期 1
·247-255
·
IF 1.648
Ouyang Mengyun,Cao Sheng,Huang Yiqun,Wang Yan
This study was aimed to investigate the effects of hot air drying (60–100 ℃, 1.5 m/s, 6–17 h; final products contained 10.50 ± 0.29% moisture) on the levels of total phenolic compounds (TPC) including both soluble phenolic compounds (SPC) and insoluble phenolic compounds (IPC) as well as ascorbic acid in pumpkin slices. IPC accounted for an average of 74.9% of the TPC in fresh pumpkin flesh, but only accounted for 49.4% (100 ℃ drying) to 59.7% (60 ℃ drying) of the TPC in the final dried pumpkin slices. As the drying temperature increased, the retention of IPC (22.8–42.7%), TPC (41.6–50.9%), and ascorbic acid (22.2–51.0%) in the dried products significantly decreased ( p < 0.05), but the retention of SPC (74.5–92.7%) significantly increased which may be due to more conversion of IPC to SPC at a higher temperature. The degradation of ascorbic acid during hot air drying fitted well to the first-order kinetic function (R 2 = 0.985–0.999), and that of IPC, SPC and TPC fitted well to zero-order reactions (R 2 = 0.887–0.997). Unlike the other three compounds, the reduced level of SPC decreased as the temperature increased ( k = 0.008–0.029/h, Ea = 33.7 kJ/mol), corresponding to the increased retention of SPC in the final dried pumpkin slices.
研究领域:
食品科学
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植物化学
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产品关联
DOI
高影响因子
PLoS One
·
2021
·Vol. 16
·期 9
·e0255504
·
IF 3.24
Jing Zhang,Zhou-Tao Pei,Ya-Ni Zhao,Meng Zhang,Li-Ling Zhang,Wen-Qiang Wang,Jing-Ya Wu,Ran Yu,Li-Wei Sun
Benzophenone (BPs) and 4-Methylbenzylidene Camphor are used as ultraviolet (UV) filters to protect the skin and hair in personal care products. The discharging of the three chemicals may endanger the receiving water ecosystem. In the present study, the mutagenicity of BP-6, BP-8, and 4-Methylbenzylidene Camphor was tested using the Salmonella typhimurium reverse mutation test (Ames test) in the system with and without rat liver microsomal preparations (S9). Four S . typhimurium strains, TA97, TA98, TA100, and TA102 were employed in the Ames tests. The mutagenicity was detected from all three chemicals. The addition of S9 increased the mutation ratios of three chemicals to four strains, except BP-6 to TA100 strain and 4-MBC to TA97 and TA98 strain. In the mixed experiment, all positive effects were detected in the absence of S9. However, the results all became negative in the presence of S9. For the mixture of BP-6 and 4-MBC, positive results were detected on four tester strains except for the TA100 strain. For the mixture of BP-6, BP-8, and 4-MBC, positive results were detected on four strains. The mixture test results showed antagonism in mutagenicity for the mixture of BP-6 and 4-MBC to TA98 and TA100 strains and the mixture of BP-6, BP-8, and 4-MBC to TA100 and TA102 strains.
研究领域:
环境科学
·
毒理学
·
生物学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）