MOLECULES
·
2016
·Vol. 21
·期 5
·555
·
IF 2.465
Zhongxiu Zhang,Xiaohui Wang,Wanqing Yang,Juan Wang,Cong Su,Xiao Liu,Jun Li,Yunfang Zhao,Shepo Shi,Pengfei Tu
Five 2-(2-phenylethyl)chromones including a new one, (5S,6R,7S,8R)-5,8-dichloro-6,7-dihydroxy-2-phenylethyl-5,6,7,8-tetrahydro-4H-chromen-4-one (1), and four known ones (2–5), were isolated from 150 mM NaCl-elicitedAquilaria sinensiscell suspension cultures. In addition, three feruloyl amides (6–8), six nucleosides (9–14), (+)-syringaresinol (15), indole-3-carboxaldehyde (16), and two glycosides (17–18) were also obtained. The structures were unambiguously identified by analysis of their UV, IR, NMR, and HRESIMS data. The absolute configuration of the new 2-(2-phenylethyl)chromone (1) was established by a dimolybdenum tetraacetate-induced circular dichroism experiment. Compared to un-elicited cell lines, the appearance of 2-(2-phenylethyl)chromones in NaCl-treated cells occurred on the 3rd and 5th days of their treatment. 2-(2-Phenylethyl)chromones, feruloyl amides, nucleosides, and lignins have been reported to be closely related to plant defense; therefore, the identification of these compounds from NaCl-elicitedA. sinensiscell suspension cultures would be useful for further exploring the mechanism of agarwood formation.Keywords:2-(2-phenylethyl)chromone;induced circular dichroism;Aquilaria sinensis;agarwood;cell suspension cultures;sodium chloride elicitation
研究领域:
植物学
·
天然产物化学
·
药用植物研究
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DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2012
·
IF 1.693
Xiaojing Li,Jiangtao Wu,Zhigang Liu
The thermal conductivity of 2-methoxyethyl acetate, 2-ethylhexyl acetate, and diethyl succinate in liquid phase was reported. The measurements of 2-methoxyethyl acetate and 2-ethylhexyl acetate, covering a temperature range from (233 to 373) K and pressure up to 20 MPa, have been performed by a transient hot-wire technique with two anodized tantalum hot wires. The measurements of diethyl succinate ranged from (263 to 383) K and atmospheric pressure to 20 MPa. The experimental data were represented by polynomial functions of pressure and temperature for the purpose of interpolation. The relative uncertainty of the present thermal conductivity data was estimated to be ± 2.0 % with a coverage factor of k = 2.
研究领域:
化学工程
·
物理化学
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DOI
高影响因子
Journal of Materials Chemistry B
·
2014
·Vol. 2
·期 44
·7785-7794
·
IF 0
Longchao Bai,Lin Tan,Lijuan Chen,Songtao Liu,Yanmei Wang
Poly(2-methyl-2-oxazoline) (PMOXA) has been proved to be a kind of potential antifouling coating material. In this work, a series of comb copolymers, poly[(2-methyl-2-oxazoline)-random-glycidyl methacrylate] (PMOXA-r-GMA), with a variety of compositions were synthesized by free radical polymerization of the oligo(2-methyl-2-oxazoline) methacrylate macromonomer and glycidyl methacrylate, and then characterized and used to coat silicon/glass surfaces. A one-step coating procedure by a simple annealing protocol was used to yield covalent and cross-linked PMOXA-based antifouling coatings. The coatings were rigorously characterized in terms of the surface chemical composition, hydrophilicity, thickness and morphology using X-ray photoelectron spectroscopy (XPS), the water contact angle (WCA) test, ellipsometry and atomic force microscopy. The results demonstrated that the PMOXA-r-GMA brushes could successfully be bonded onto silicon/glass surfaces. Finally, the fouling resistance ability of the modified surface was evaluated by analyzing the adsorption of bovine serum albumin protein, bacterial cell attachment and platelet adhesion, which indicated that the modified silicon/glass surfaces had a superior resistance to protein, bacterial cell and platelet adsorption, and the performance of fouling resistance was enhanced with the content of PMOXA segments in the copolymers.
研究领域:
材料科学
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生物医学工程
·
表面化学
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DOI
PubMed
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Xiaoqin Shi,Shufeng Shen
Nonaqueous secondary alkanolamine-based systems, replacing conventional water with 2-alkoxyethanols as cosolvents, have recently attracted much attention for an energy-efficient CO 2 capture process. In this work, physical solubility of N 2 O and CO 2 in 2-(methylamino)ethanol (MAE), 2-methoxyethanol (2-ME) and their blends was measured and correlated at temperatures ranging from (283.2 to 333.2) K. Vapor-liquid equilibrium (VLE) data for the CO 2 + MAE + 2-ME system at 7.8, 19.4 and 39.1 mass% MAE were also measured in a stirred equilibrium cell at temperatures of (313.2–393.2) K and CO 2 partial pressures up to 270 kPa. VLE data were represented by a modified Kent-Eisenberg model with an AARD of 12.6%. The apparent equilibrium constants considering the liquid nonideality were well correlated as a function of temperature, concentration of carbamate product and CO 2 loading.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2020
·Vol. 36
·期 5
·816-820
·
IF 1.063
Chu Ning,Xu Shuping,Xu Weiqing
Two different kinds of configurations of 1,4-bis[2-(4-pyridyl)ethenyl]-benzene( trans -bpeb and cis -bpeb) were achieved, and a bpeb dimer was synthesized in dimethyl sulfoxide(DMSO). Compared with the previous work that synthesized the bpeb dimer or polymer in crystal with a template agent needed, the reaction occurred in a solution phase in the present method. A hand-held ultraviolet lamp(365 nm) with the power of 12 W and the Watt density of 0.35 mW/cm 2 can realize the photodimerization of bpeb, instead of the high-power mercury lamp in most previous studies. Unlike other 2+2 cycloaddition in liquid state using catalysts even noble metals, no catalysts were required here, which is cost-saving. Only the trans -pbeb can start the cycloaddition and the formation of the close J-aggregations of trans -pbeb in DMSO is a precondition for explaining the 2+2 photodimerization. The productivity for the 2+2 cycloaddition product was achieved as 55.6%.
研究领域:
有机化学
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光化学
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超分子化学
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材料化学
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合成方法学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 22
·19931-19942
·
IF 2.22
Chen Qi-Wen,Zhou Jian-Ping,Zhu Pan-Pan
Mg 7 V 4 O 16 (OH) 2 ·H 2 O was prepared by improving the hydrothermal conditions and Mg 3 (VO 4 ) 2 was obtained by heat treatment of Mg 7 V 4 O 16 (OH) 2 ·H 2 O at 700 °C. XRD shows a phase transition from a hexagonal structure to an orthogonal structure, which is confirmed by the HRTEM results. Mg 3 (VO 4 ) 2 keeps overall pencil-shaped SEM morphology with Mg 7 V 4 O 16 (OH) 2 ·H 2 O but shows a lot of spaces due to the loss of hydroxyl groups and crystal water in the structure during heat treatment. Mg 3 (VO 4 ) 2 enjoys a narrower band gap in comparison with Mg 7 V 4 O 16 (OH) 2 ·H 2 O. The space in Mg 3 (VO 4 ) 2 microstructure and its narrower band gap improve the transmission efficiency of Li + , reaching a stabile capacity of 151 mAh/g after cycling 100 times at a current density of 100 mA/g.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2015
·Vol. 30
·期 5
·1098-1102
·
IF 0.399
Zhou Yong,Liu Fude,Wu Haiyan,Duan Lijie,Qu Boyang
One conjugated polymer consisting of carbazole and 3-hexylthiophene moiety, poly (N-Hexyl-2,7-di(2-(4-hexylthiophene)carbazole) (PNDC), has been synthesized by ferric chloride oxidative polymerization. The monomer N-Hexyl-2,7-di(2-(4-hexylthiophene)carbazole was synthesized and characterized by IR, 1 H-NMR, 13 C-NMR and MS. UV-vis absorption spectrum, fluorescence spectrum, photoluminescence spectrum and electrochemical properties of the polymer were investigated. Polymer PNDC shows maximum peak appearing at 394 nm in UV-vis absorption spectrum, strongest fluorescence-emission at 482 nm in fluorescence spectrum and maximum emission peak at 492 nm in photoluminescence spectrum. The band-gap ( E
g ), HOMO energy ( E
HOMO ), and LUMO energy ( E
LUMO ) of the polymer were obtained as 2.58, -5.32, and -2.74 eV, respectively.
研究领域:
材料科学
·
有机化学
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DOI
高影响因子
Russian Journal of Physical Chemistry A
·
2025
·Vol. 98
·期 13
·3009-3016
·
IF 0.8
Zhe Wang,Li Junzhi,Zhao Wei,Li Xiao Liang
The isobaric vapor-liquid equilibrium data for the four systems consisting of 1-octene + 2-methyl-thiophene, cyclohexene + 2-methylthiophene, 2,3-dimethyl-1-butene + 2-methylthiophene, and 2,3-dimethyl-2-butene + 2-methylthiophene were determined by using a modified Rose-Williams equilibrium still at 90.00 kPa. All the vapor-liquid equilibrium data measurements passed the thermodynamic consistent test by employing the Herington method. The azeotropic behavior was observed in the 1-octene + 2-methyl-thiophene system. Additionally, the experimental data were correlated by the Wilson model, and they were also compared with the original UNIFAC and UNIFAC Dortmund predictive models. All the results indicated that the measured data were in good agreement with the calculated values obtained from the Wilson. Meanwhile, the UNIFAC Dortmund model can provide better prediction result than the original UNIFAC model.
研究领域:
化学工程
·
热力学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Tiantian Ping,Qinghai Long,Shufeng Shen
Solubility of N2O and CO2 in pure 2-butoxyethanol (2-BE) was determined in a stirred equilibrium cell at temperatures ranging from 283.2 to 333.2 K and correlated as an exponential function of temperature. Ratios of solubility of CO2 to N2O in several reported solvents were found to be strongly dependent on the order of solvent dielectric constants. Solubility of N2O in 2-(butylamino)ethanol (BAE) and the binary blends of 2-BE and BAE was measured over the temperature range from 283.2 to 333.2 K and with BAE concentration from 6.5 to 65.4 mass%. N2O solubility data were well represented by correlation models with AARDs within 0.8%. Physical solubility of CO2 in a nonaqueous 2-BE/BAE system can be estimated using the N2O analogy method.
研究领域:
化学工程
·
环境科学
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产品关联
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2012
·Vol. 291
·期 4
·919-925
·
IF 2.331
Ambreen Jaweria,Yang Jinxian,Ye Xiaodong,Siddiq Mohammad
The temperature-induced phase transition of poly(2-ethyl-2-oxazoline) (PEtOx) aqueous solution under mixing with a series of small carboxylic acids has been studied by turbidity measurements and laser light scattering. It has been found that cloud point temperature ( T
cp ) of the PEtOx was changed to varying degrees depending upon the pH, ionic strength, molar ratio of acids to 2-ethyl-2-oxazoline unit, and carbon chain length of small carboxylic acids. Significant change in T
cp was observed in the case of hexanoic acid. At acidic pH, an increase in the molar ratio of hexanoic acid to the 2-ethyl-2-oxazoline unit gradually decreased the phase transition temperature of the polymer as compared to the T
cp of pure PEtOx. At original pH 6 (pH > p K
a ), T
cp shifts to higher value than that of pure PEtOx for lower molar ratios and decreased later on with increasing the molar ratio. The shift in the T
cp is described based on the differences in the driving force of phase transition, including hydrogen bonding between small carboxylic acids and PEtOx polymer and hydrophobic interaction.
研究领域:
高分子化学
·
物理化学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Mengyu Zhu,Jun Lu,Linchang Dong,Shuheng Hu,Shuchuan Peng,Chengzhu Zhu
The possible photochemical transformation pathways of chlorophenols (2, 6-dichlorophenol and 2-chlorophenol) with superoxide anion radical (O 2 ·− ) were studied by steady-state irradiation and 355 nm laser flash photolysis technique. O 2 ·− was generated by irradiating riboflavin O 2 -saturated solution with an UVA light (maximum at 365 nm). The steady-state experimental results suggested that the transformation efficiency of chlorophenols improved with the increase of the initial riboflavin concentration and solution initial pH value, while the increase of chlorophenols concentration would inhibit the photochemical reaction. The second-order rate constant of the reaction of O 2 ·− with 2, 6-DCP phenoxyl radical (2, 6-DCP · ) and 2-CP phenoxyl radical (2-CP · ) were determined as (8.39 ± 0.99) × 10 9 L mol −1 s −1 and (5.17 ± 0.68) × 10 9 L mol −1 s −1 by laser flash photolysis techniques, respectively. The transformation of chlorophenols was accompanied by the formation of Cl − induced by superoxide radicals after the mixed riboflavin and chlorophenols solution with UVA irradiation. The main conversion products of the reaction between 2, 6-DCP and O 2 ·− were identified by GC-MS, as 2-chlorophenol, 2, 6-dichloro-1, 4-benzoquinone, 2, 6-dichloro-hydroquinone and 3-chlorocatechol, while 2-CP with O 2 ·− was 2-chloro-1, 4-benzoquinone, 2-chlorohydroquinone and phenol, respectively. The transformation pathways of 2, 6-DCP and 2-CP with O 2 ·− were also proposed.
研究领域:
环境科学
·
化学
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DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2023
·
IF 4.3
Dou Xuechen,Zhang Zhiwei,Liu Bo,Li Chao,Du Yaohua,Tian Feng
Nucleocapsid protein (NP) is one of the structural proteins of SARS-CoV-2 which is stable, well-conserved, highly immunogenic, and abundantly expressed due to the host’s adaptive immune response, making it a promising antigenic biomarker for the early and rapid identification and diagnosis of SARS-CoV-2. Traditional antigen analytical methods with NP as the detection marker often have insufficient sensitivity. To achieve rapid and highly sensitive detection of NP, we constructed a novel single-molecule (digital) fluorescence-linked immunosorbent assay (FLISA) based on streptavidin-modified transparent 96-well microplates. Streptavidin was immobilized on the microplate under optimized conditions with a 15 mM carbonate buffer solution (pH 9.6) as the coating solution, biotinylated antibodies conjugated with streptavidin as capture probes, and carboxylated fluorescent microsphere-conjugated monoclonal antibodies (FMs-mAbs) as fluorescent probes. Individual sandwich immunolabeled complexes of the SARS-CoV-2 diagnostic marker NP were detected and counted though wide-field inverted fluorescence microscopy (1.1 × 1.4 mm 2 ). FLISA had a linear detection range of 0.2 pg/mL to 200 ng/mL and a limit of detection (LOD) of 0.73 fg/mL and 8 fg/mL for NP in phosphate buffer saline and spiked nasal swab samples, respectively. The sensitivity was much higher than commercial antigen detection kits, providing wide detection prospects in future clinical diagnosis, environmental monitoring, and other fields.
研究领域:
病毒学
·
免疫学
·
分析化学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）