TALANTA
·
2016
·
IF 4.035
Junwei Liu,Yong Wang,Weixia Li,Peimin Zhang,Nani Wang,Shuchao Wu,Yan Zhu
Poly (glycidylmethacrylate-divinylbenzene) (Poly (GMA-DVB)) microspheres were prepared by the two-staged swelling and polymerization method, and modified with octadecylamine (ODA) to obtain ODA-poly (GMA-DVB) stationary phase for HPLC. The new material was characterized by scanning electron microscope, nitrogen adsorption-desorption measurement, Fourier transform infrared spectrum , elemental analysis and thermogravimetric analysis . The results showed that poly (GMA-DVB) microspheres had good monodispersity, porosity and ball shapes. The diameters and specific surface area of the microspheres were about 6 µm and 396 m 2 g −1 , respectively. ODA-poly (GMA-DVB) stationary phase had good thermal stability. Furthermore, the chromatographic performance of the stationary phase was illustrated by separating n-alkylbenzenes, mono-substituted benzenes and N -nitrosamines. Auxiliary quantum chemistry calculation was also carried out to evaluate the interaction mechanism. According to the evaluation, ODA-poly (GMA-DVB) stationary phase exhibited good hydrophobicity and hydrophobic selectivity, strong stereo-selectivity, polar interaction and π-π interaction. The multi-interaction mechanisms could very likely guarantee its excellent chromatographic performance for the analysis of complex samples. Finally, the column was successfully applied in the determination of N -nitrosamines in pickles sample.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2016
·
IF 1.207
Yuqian Li,Liguo Wang,Peng He,Kelin Huang,Huiquan Li,Yan Cao
In this study, the quasi-static ebulliometric method was used to measure both of the vapor pressures of methyl N -phenyl carbamate (MPC), and the isobaric vapor–liquid equilibrium (VLE) data of the aniline and MPC binary system. The measured vapor pressure data of MPC, at different temperature ranging from 369.60 to 389.54 K, fitted well with the Antoine equation. The VLE data for the aniline and MPC system at (2.00, 4.00, 6.00, 7.00 and 8.00) kPa were correlated by both of nonrandom two-liquid (NRTL) and Wilson models. The parameters of the two models were obtained by regressing the experimental data, with the absolute temperature deviations of 0.54 K and 0.53 K, respectively. The relative volatility of the binary system calculated was all far more than 1, which gives the conclusion that the high purity MPC can be separated from aniline and MPC binary system by rectification or distillation technology.
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ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Min Jiang,Xueping Cao,Dandan Zhu,Yongxin Duan,Jianming Zhang
A core-shell structure composite, zeolitic imidazolate framework @ cetyltrimethylammonium bromide (ZIF-8@CTAB) was synthesized by CTAB micelle controlling the growth of ZIF-8 in aqueous systems. Direct carbonization of ZIF-8@CTAB at a high temperature produced the nitrogen-doped hierarchically porous carbon (named as PC1000@C). In comparison with the carbonization product of pure ZIF-8 (named as PC1000), PC1000@C possesses the higher specific surface area and two-times larger total pore volume. The results from elemental analysis shows the higher N content in PC1000 sample, while X-ray photoelectron spectroscopy curve-fitting shows the higher quaternary-N content in PC1000@C sample. The hierarchical microporous/mesoporous structure, high surface area and favorable N species in PC1000@C play an active role in catalyzing oxygen reduction reaction (ORR). The specific capacitance of porous carbon was calculated from the galvanostatic-discharge curve. PC1000@C exhibits a large specific capacitance of 225 F g −1 at a current density of 0.5 A g −1 and still retains 92% of initial capacitance after 1000 galvanostatic charge-discharge cycles.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2016
·Vol. 33
·期 5
·1692-1697
·
IF 1.408
Yue Hongya,Liu Zhigang
Density and surface tension have been measured for mixtures of biodiesel+ n -butanol, biodiesel+diesel, and diesel+ n -butanol over the entire concentration range at 283.15 K and 293.15 K and atmospheric pressure, with the combined expanded uncertainties of 1.32 kg·m −3 and 1%, receptively. Densities were determined by a single-sinker densimeter; surface tensions were measured using the surface laser light scattering method. The experimental data showed that densities and surface tensions decreased as temperature increased. The excess surface tensions and excess densities were all negative, and further fitted to the Redlich-Kister equation.
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EUROPEAN JOURNAL OF LIPID SCIENCE AND TECHNOLOGY
·
2017
·Vol. 119
·期 12
·1700300
·
IF 2.145
Long Xu,Li Zhang,Daoming Li,Pengzhan Liu,Chin-Ping Tan,Weifei Wang,Xiangqian Liu,Bo Yang,Dongming Lan,Yonghua Wang
Efficient synthesis of n-3 PUFA-enriched triacylglycerol (TAG) by the esterification of glycerol with n-3 PUFA in deep eutectic solvents (DES) is reported. There was a 1.2-fold increase of TAG yield in DES compared with that in the solvent-free system. Adsorption of the produced water by DES during esterification contributed to enhance the conversion efficiency by changing the reaction equilibrium. DES also served as an effective solvent for enriching the n-3 PUFA of TAG in the upper layer of reaction media. A TAG yield of 55% was achieved under the optimal condition. Practical Applications : Enzymatic synthesis of n - 3 PUFA-enriched triacylglycerol (TAG) is challenged by low yields. Here, deep eutectic solvents show great potential for enhancing the production of n-3 PUFA-enriched TAG. The production of n-3 PUFA-enriched triacylglycerol is greatly enhanced in deep eutectic solvents.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Jianguo Chang,Xiuyun Yang,Yuqin Ma,Jing Shao,Xiaoniu Yang,Zhaobin Chen
On the basis of the reaction of 5,5-dimethylhydantoin potassium salt with dibrominated alkane, a series of hydantoin derivatives in which two hydantoin rings are bridged by an alkyl chain with different length (C2, C6, C8, and C12) were synthesized. Upon chlorination, these compounds were transformed into hydantoin-based N-halamines. The structures of these samples were fully characterized with 1H NMR, FT-IR, UV/vis, thermal analyses, and iodometric titration. The antibacterial activity of these N-halamines was assessed with 4 × 109 CFU/mL of Gram-negative Escherichia coli under different chlorine concentrations and over different periods of contact time. It was found that the antibacterial properties and the releasing characteristics of the active chlorine of the hydantoin-based N-halamines changed obviously with increased alkyl chain length, and the factors influencing the antibacterial efficacy were discussed in terms of water solubility, steric effect, electron-donating effect, and action mechanism.
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ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Yijie Hu,Xing Tong,Hao Zhuo,Linxin Zhong,Xinwen Peng
Composites combining electrostatic charge accumulation and faradic reaction mechanisms are especially attractive high-performance supercapacitor electrodes for electrochemical energy storage. Up to now, it is difficult to prepare low-cost carbon composites from renewable resources. In this work, an outstanding and low-cost composite was fabricated by using sustainable N-self-doped carbon framework as a hierarchical porous carbon substrate from renewable resource. The N-self-doped carbon framework was fabricated from chitosan via a facile yet unique self-assembly and ice template method without any physical or chemical activation, and exhibited hierarchical porous structure. This texture not only allowed the efficient infiltration and uniform coating of polyaniline (PANI) in the inner network but also permitted a rapid penetration and desorption of electrolytes. Due to short diffusion pathway, uniformly coating of PANI, and high accessibility of PANI to electrolytes, the composite electrode had a very high supercapacitance of 373 F g–1 (1.0 A g–1) and excellent rate capability (275 F g–1, 10 A g–1) in a three-electrode system. The symmetric supercapacitor also showed a supercapacitance of high up to 285 F g–1 (0.5 A g–1), and a very high energy density of 22.2 Wh kg–1. Furthermore, the composite also presented a good cycling stability.
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JOURNAL OF BIOMATERIALS APPLICATIONS
·
2017
·
IF 2.31
Jianzhou Cai,Wu Zhang,Jiake Xu,Wei Xue,Zonghua Liu
Chitosan, as a potential vaccine delivery material, has obtained much attention for immunization prevention and therapy. However, its poor water solubility brings inconvenience for the practical applications. To address this issue, researchers have carried out many chemical modifications to prepare water-soluble chitosan derivatives for vaccine delivery. In this work, we prepared a chitosan derivative N-phosphonium chitosan with excellent water solubility and explored its potential as an intramuscular vaccine delivery system by using ovalbumin as a model antigen. Different vaccine formulations were intramuscularly injected into test mice. Through an immunohistochemistry assay, N-phosphonium chitosan-based antigen formulation could promote antigen arrival from injection site to the secondary lymph organ spleen. Further immunization results showed that 1 mg/ml N-phosphonium chitosan-based vaccine formulation could contribute to significantly higher level of antigen-specific immune responses, including higher antigen-specific IgG antibody titer, splenocyte proliferation, and cytokines secretion (interferon-γ, interleukin-10, and interleukin-4) by the splenocytes of the immunized mice. From the results, the water-soluble chitosan derivative N-phosphonium chitosan could be developed as a potential antigen carrier for immunization prevention and therapy.
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ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Tongkun Zhao,Jiakui Zhang,Zheng Du,Yahua Liu,Guoli Zhou,Jingtao Wang
Two-dimensional transition metal carbides, MXenes, with large surface area, excellent electrical conductivity and chemical stability, have proved promising for energy storage. However, the irreversible re-stacking and low capacity of MXenes restrict their development and practical applications. Here, the N-doped carbon decorated MXene (Ti 3 C 2 T x @NC) composites were synthesized via an in-situ self-polymerization of dopamine on the surface of Ti 3 C 2 T x followed by a carbonization process. The Ti 3 C 2 T x and Ti 3 C 2 T x @NC were systematically characterized, which have been manifested that NC were equably decorated on the surface and interlayer of Ti 3 C 2 T x sheets and a unique three-dimensional composited nanostructure was fabricated. Such nanostructure can confer both high surface area of NC layer and effective avoidance of the restacking of Ti 3 C 2 T x sheets, whilst, importantly, rendering the composites good conductivity and additional pseudocapacitance. As a result, the optimized Ti 3 C 2 T x @NC-2 composite exhibited a high specific capacitance of 442.2 F g −1 under a current density of 1 A g −1 , which is 281% higher than that of Ti 3 C 2 T x . As a further description, Ti 3 C 2 T x @NC achieved an excellent cycling stability with capacitance retaining 91.9% after 5000 cycles and a high rate capability of 92.5% at 10 A g −1 . Besides, the Ti 3 C 2 T x @NC-2-based symmetric supercapacitor presents a delighted energy density and power density. Therefore, the elaborately designed Ti 3 C 2 T x @NC composites provided a pregnant exploration for energy-related applications.
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ANALYST
·
2017
·Vol. 142
·期 17
·3212-3218
·
IF 3.885
Yu-Fang Ma,Fang Yuan,Xiao-Hui Zhang,Ying-Lin Zhou,Xin-Xiang Zhang
The enrichment of glycopeptides plays an important role in glycoproteomics. In this paper, a covalent-organic framework called TpPa-1, synthesized by the Schiff base reaction of 1,3,5-triformylphloroglucinol and paraphenylenediamine, was first successfully utilized as a hydrophilic porous material for N-linked glycopeptide enrichment. Using this material, interference from non-glycopeptides could be efficiently eliminated, which facilitated the mass spectrometry detection of glycopeptides. By capturing N-linked glycopeptides from tryptic digests of human IgG, our method was proved to have high sensitivity at the femtomole level. And it showed superior selectivity for glycopeptides even when non-glycopeptides were 1000 times more concentrated. Due to the strong covalent bonds, this material possessed good stability and could be repeatedly used for at least 10 times. The ultra-low mass density and abundant binding sites also provided it with high binding capacity (178 mg g−1, IgG/TpPa-1). Moreover, N-linked glycopeptides were easily enriched by this material from only 10 μL human serum, which demonstrated its potential in pretreatment of complex biological samples.
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MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Honghong Liu,Hong Gong,Mingming Zou,Heng Jiang,Rasaki Sefiu Abolaji,Ayesha Khan Tareen,Branislav Viliam Hakala,Minghui Yang
Mo-N-co-doped mesoporous TiO 2 microspheres were synthesized via a solvothermal method, followed by nitriding treatment under ammonia gas flow. The efficiency of the samples was investigated by monitoring the degradation of Rhodamine-B under visible light irradiation. The experimental results revealed that Mo-N-co-doped mesoporous TiO 2 microspheres showed better performances than Mo-TiO 2 microspheres. It was observed that; 0.1% molar quantity of Mo doped on TiO 2 at 500 °C for 2 h under nitriding conditions gave highest photocatalytic activities. The nitridation under ammonia gas of Mo-TiO 2 samples created oxygen vacant sites and led to incorporation of substitutional and interstitial Nitrogen. The enhanced visible light photocatalytic activities of Mo-N-co-doped TiO 2 photocatalyst was attributed to the large surface areas, narrow band gap and intense light absorbance in visible region. This study may create a promising and eco-friendly method towards synthesis of metal and non-metals co-doped on semiconductor materials to improve their photocatalytic activities and applications.
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CARBOHYDRATE POLYMERS
·
2013
·
IF 3.479
Jing Wang,Xuesong Zhou,Huining Xiao
Semi-interpenetrating polymer network (SIPN) strategy was employed to fabricate a kind of novel hydrogels composed of cellulose and poly( N -isopropylacrylamide) (PNIPAAm) in the presence of N , N ′-methylenebisacrylamide (MBAAm) as the crosslinker and benzoyl peroxide (BPO) as the initiator. The results from FTIR and TGA indicated that the network indeed existed in the SIPN hydrogels. The data from experiments, those related to the swelling behavior of the hydrogels at different temperatures in particular, demonstrated the thermal sensitivity of these hydrogels. The impact of crosslinker content on the hydrogel properties was discussed as well. The swelling ratio of hydrogels decreased with increasing the content of MBAAm. Besides, the loading and releasing behavior of the hydrogels were examined using dimethyl methylene blue as a model drug. These novel hydrogels combining the advantages of natural polymer with thermal responsive behavior are of great potential to be applied to drug delivery and control release systems.
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