NEW JOURNAL OF CHEMISTRY
·
2014
·Vol. 38
·期 7
·3078-3083
·
IF 3.159
Dan Kong,Yanyan Liu,Juan Zhang,Hongbian Li,Xiangyu Wang,Guangyu Liu,Baojun Li,Zheng Xu
The research on the heterogeneous catalytic synthesis of tetrazoles has attracted great attention. In this paper, a tungsten atom-containing AlPO-5 microporous molecular sieve (termed as WAlPO-5) was designed and synthesized by the incorporation of tungsten atoms into the AlPO-5 skeleton with triethylamine as a structure template from pseudoboehmite, H3PO4 and tungstophosphoric acid. The incorporation of tungsten atoms into the AlPO-5 skeleton has been demonstrated by systematic characterizations. WAlPO-5 can be used as an efficient heterogeneous catalyst for the synthesis of 5-substituted 1H-tetrazoles by [3+2] cycloaddition from nitriles and sodium azide. As a novel heterogeneous catalyst, WAlPO-5 exhibits a high catalytic activity, a superior cycling stability and an excellent substrate applicability. The significant advantages of WAlPO-5, such as the simple procedure and the mild reaction conditions and as an alternative to those corrosive, hazardous and polluting homogeneous catalysts, warrant its potential application in industrial processes.
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AQUACULTURE
·
2013
·
IF 2.009
Cuiying Chen,Baoli Sun,Xiaoxia Li,Peiyu Li,Wutai Guan,Yingzuo Bi,Qing Pan
To quantify the optimum requirement of dietary linolenic acid (18:3n-3, LNA) for Nile tilapia ( Oreochromis niloticus ), purified ethyl linolenate was added to the basal diet to provide the dietary LNA level of 0.00, 0.10, 0.32, 0.63, 0.98, 1.56 and 2.04% of dry weight, respectively. All diets contained similar amounts of 18:2n-6 (0.61% of dry weight) and 18:1n-9 from purified ethyl linoleate and oleate , respectively. Basal diet without LNA was considered as a control. After 2-week acclimation with a lipid-free diet, 4 replicate groups of 120 juvenile fish with initial body weight of 2.10 g were fed with experimental diets in a recirculated fresh water rearing system for 10 weeks. Feeding rate was 10% of body weight in the first 2 weeks, 8% in the following 4 weeks, and then gradually reduced to 5% in the next 4 weeks. Fish were fed three times daily at 8:30, 12:00 and 17:00. The results showed that fish fed the diet with 0.63% of LNA had significantly higher weight gain (WG) and specific growth rate (SGR) than fish fed the control diet ( P < 0.05). Feed efficiency (FE) and protein deposition (PD) in fish fed diets with 0.63, 0.98, 1.56 and 2.04% of LNA were significantly higher than those of the control group ( P < 0.05). Fish muscle fatty acid composition reflected dietary fatty acids. Increasing dietary LNA levels resulted in increased contents of LNA and 22:6n-3, but decreased contents of 20:4n-6 and 20:5n-3. When WG and FE were subjected to broken-line regression analysis, the breakpoint was achieved at dietary LNA levels of 0.45 and 0.64% of dry weight, respectively. Based on those results, the recommended optimum requirement of dietary LNA for juvenile tilapia is 0.45–0.64% of dry weight.
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Analytical Methods
·
2013
·Vol. 5
·期 20
·5444-5449
·
IF 1.855
Xin Wang,Yunchun Liu,Lianbing Ren,Hengye Li,Zhen Liu
A new hydrophilic boronate affinity monolithic capillary was synthesized for the selective capture of cis-diol biomolecules including glycoproteins and nucleosides, using (3-acrylamidophenyl)boronic acid (APBA) and N,N-methylenebisacrylamide (MBAA) as the functional monomer and cross-linker, respectively. A comparison with other compositionally similar monolithic capillaries was carried out in terms of reversed-phase retention, selectivity, binding capacity and binding pH. The poly(APBA-co-MBAA) monolithic capillary exhibited notably different properties. As both the functional monomer and the cross-linker are hydrophilic, the monolith capillary showed suppressed reversed-phase retention and as a result excellent selectivity toward both nucleosides and glycoproteins was observed. It exhibited the highest binding capacity as compared with other compositionally similar monolithic capillaries. Besides, because of the lower pKa value of APBA, the monolithic capillary was able to selectively capture nucleosides at near-physiological pH.
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MICROCHIMICA ACTA
·
2013
·Vol. 180
·期 11
·1051-1057
·
IF 3.434
Wang Ai-Jun,Guo Han,Zhang Ming,Zhou Dan-Ling,Wang Rui-Zhi,Feng Jiu-Ju
We have developed a simple, sensitive and selective colorimetric method for the detection of cadmium(II) (Cd 2+ ) using gold nanoparticles modified with 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole. Organic solvents or additives are not required. It is found that Cd 2+ induces the aggregation of the modified Au-NPs via chelation, leading to a color change from red to blue. This change can be seen with bare eyes, and monitored by UV–vis spectroscopy, transmission electron microscopy and dynamic light scattering. The detection limit is 30 nM (at a signal-to-noise ratio of 3). The new approach was successfully applied to the detection of Cd 2+ in spiked samples of tap water and lake water, and the results agree well with those obtained by flame atomic absorption spectroscopy.
A simple, sensitive and selective colorimetric method was developed for the detection of Cd 2+ , where 4-amino-3-hydrazino-5-mercapto-1,2,4-triazol (AHMT) modified gold nanoparticles (AuNPs) were used as optical probes. The presence of Cd 2+ induced the aggregation of the AHMT-AuNPs through the chelation process. This approach was successfully applied for the detection of Cd 2+ in spiked samples of tap water and lake water.
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COLLOID AND POLYMER SCIENCE
·
2013
·Vol. 291
·期 9
·2191-2202
·
IF 2.161
Zhao Yingyuan,Du Wei,Sun Limei,Yu Li,Jiao Jingjing,Wang Rui
Calcium carbonate (CaCO 3 ) nanocrystals with controllable polymorph and morphology have been successfully synthesized with the aid of an effective control agent, a halogen-free, low-cost ionic liquid surfactant, 1-butyl-3-methylimidazolium dodecylsulfate ([C 4 mim][C 12 SO 4 ]) in a supersaturated aqueous solution. For the first time, facile preparation of pure lens-like vaterite, sheet-like calcite, and peanut-like aragonite was all achieved in the [C 4 mim][C 12 SO 4 ] aqueous solution through changing the concentration, temperature, and initial pH value and adding magnesium ions. Washed by water and ethanol, all the aggregates were free of [C 4 mim][C 12 SO 4 ] and can be stable at least 1 month in air. The crystal form of the aggregates changed from pure calcite to pure vaterite at room temperature only through increasing [C 4 mim][C 12 SO 4 ] concentration. Formation of the ordered CaCO 3 structures is mainly ascribed to the aggregation of the primary nanoparticles whose formation mechanism is related to the change of supersaturation. This study can provide a facile and environment-friendly method to fabricate CaCO 3 crystal aggregates with various morphologies and polymorphs and can be used for large-scale industrial production and biomimetic synthesis.
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SEPARATION SCIENCE AND TECHNOLOGY
·
2015
·
IF 1.171
Xiaosheng Tang,Jun Yao,Ping Tang
In this study, 3-mercaptopropyltriethoxysilane (MPTS) modified mesoporous silica based on multiwalled carbon nanotubes (MWCNTs@mSiO2-MPTS) was successfully prepared. The adsorption material was characterized and used for adsorbing Hg(II) ions from aqueous solution. The equilibrium data conformed better to the Langmuir isotherm with maximum adsorption capacity calculated 349.65 mg/g at 40ºC. The kinetics analysis revealed the adsorption process fitted well with the pseudo-second-order kinetic model. The thermodynamic parameters indicated the adsorption process was spontaneous and endothermic. All results obtained suggested that MWCNTs@mSiO2-MPTS may be employed as an efficient material for the adsorption or preconcentration of Hg(II) ions from aqueous solution.
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RSC Advances
·
2017
·Vol. 7
·期 36
·22256-22262
·
IF 3.108
Xiafei Guo,Aiziguli mulati,Mian Wu,Jie Zhang,Liu Yang,Faqiong Zhao,Baizhao Zeng
A novel poly(indole-co-3-methylthiophene)–ionic liquid (i.e., 1-allyl-3-vinylimidazolium bis((trifluoromethyl)sulfonyl)imide) (P(In–3-MeT)/IL) composite film was electrodeposited on a stainless steel wire for headspace solid phase microextraction. The obtained P(In–3-MeT)/IL coating was rough and showed a cauliflower-shape. It had high thermal stability (up to 450 °C) and mechanical stability and could be used for at least 180 times in solid phase microextraction (SPME) without a decrease in extraction performance. The coating exhibited high extraction capacity for some polycyclic aromatic hydrocarbons (e.g. naphthalene, 1-methylnaphthalene, acenaphthene, biphenyl, fluorene and phenanthrene) due to the strong hydrophobic and π–π interactions between the analytes and P(In–3-MeT)/IL. Through coupling with GC, good linearity (correlation coefficients higher than 0.9994), wide linear ranges (0.05–50 μg L−1) and low limits of detection (6.25–25.2 ng L−1) were achieved for these analytes. The reproducibility (defined as RSD) was 3.5–5.5% and 4.5–7.2% for single fiber (n = 5) and fiber-to-fiber (n = 5), respectively. The SPME-GC method was successfully applied for the determination of three real samples, and the recoveries for standards added were 86.8–105% for mosquito-repellent incense, 89.9–110% for cigarettes and 82.3–103% for industrial lubricant.
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APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2016
·Vol. 180
·期 6
·1196-1212
·
IF 1.606
Wang Yilong,Zhang Yun,Hu Yunfeng
One novel microbial esterase PHE21 was cloned from the genome of Pseudomonas oryzihabitans HUP022 identified from the deep sea of the Western Pacific. PHE21 was heterologously expressed and functionally characterized to be a robust esterase which behaved high resistance to various metal ions, organic solvents, surfactants, and NaCl. Despite the fact that the two enantiomers of ethyl 3-hydroxybutyrate were hard to be enzymatically resolved before, we successfully resolved racemic ethyl 3-hydroxybutyrate through direct hydrolysis reactions and generated chiral ethyl ( S )-3-hydroxybutyrate using esterase PHE21. After process optimization, the enantiomeric excess, the conversion rate, and the yield of desired product ethyl ( S )-3-hydroxybutyrate could reach 99, 65, and 87 %, respectively. PHE21 is a novel marine microbial esterase with great potential in asymmetric synthesis as well as in other industries.
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PubMed
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-15
·
IF 4.259
Zeng Liang,Yan Jingna,Luo Liyong,Ma Mengjun,Zhu Huiqun
We were employing nanotechnology to improve the targeting ability of (−)-Epigallocatechin-3-gallate (EGCG) towards MCF-7 cells, and two kinds of EGCG nanoparticles (FA-NPS-PEG and FA-PEG-NPS) were obtained, besides, their characteristics and effects on MCF-7 cells were studied. The results indicated that (i) both FA-NPS-PEG and FA-PEG-NPS have high stabilities; (ii) their particles sizes were 185.0 ± 13.5 nm and 142.7 ± 7.2 nm, respectively; (iii) their encapsulation efficiencies of EGCG were 90.36 ± 2.20% and 39.79 ± 7.54%, respectively. (iv) there was no cytotoxicity observed in EGCG, FA-NPS-PEG and FA-PEG-NPS toward MCF-7 cells over all concentrations (0~400 μg/mL) tested; (v) EGCG, FA-NPS-PEG and FA-PEG-NPS inhibited MCF-7 cells proliferation in dose-dependent manners, with the average IC 50 of 470.5 ± 33.0, 65.9 ± 0.4 and 66.6 ± 0.6 μg/mL; (vi) EGCG, FA-NPS-PEG and FA-PEG-NPS could modulated the expressions of several key regulatory proteins in PI3K-Akt pathway such as up-regulation of PTEN, p21 and Bax, and down-regulation of p -PDK1, p -AKT, CyclinD1 and Bcl-2, which gave an illustration about the mechanism by which EGCG nanoparticles inhibited MCF-7 cells proliferation. In this study, EGCG nanoparticles can significantly enhance the targeting ability and efficacy of EGCG, which is considered to an experimental foundation for further research on its activity, targeting ability and metabolism in vivo .
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ChemNanoMat
·
2017
·Vol. 4
·期 2
·165-169
·
IF 2.937
Dandan Men,Lifeng Hang,Honghua Zhang,Xiaomin Zhang,Xianjun Lyu,Weiping Cai,Yue Li
Graphical A HF acid sensor with good recyclability and selectivity was fabricated by embedding a 2D Au nanosphere array in a 3-acrylamidophenylboronic acid-functionalized hydrogel film. The volume of hydrogel film swelled with increasing concentration of HF acid, resulting in a red shift of the diffraction wavelength. The concentration of HF acid could be detected by monitoring the wavelength of the diffraction spectra. A novel hydrofluoric acid sensor was prepared by attaching a two-dimensional (2D) gold nanosphere array onto the surface of a poly(acrylamide-co-3-acrylamidophenylboronic acid) P(AAm-co-APBA) hydrogel film. The volume of the hydrogel film swelled with increasing concentration of hydrofluoric acid due to the formation of borofluoride anions between hydrofluoric acid and phenylboronic acid group, resulting in a red shift of diffraction wavelength. The concentration of hydrofluoric acid was determined through monitoring the wavelength of the diffraction spectra. Additionally, this hydrofluoric acid sensor exhibited good sensitivity, selectivity and recyclability. Moreover, this method may be applied to detect various substances and could be widely used in diverse areas such as biochemical sensors, environmental monitoring, and food analysis by selecting an appropriate recognition agent attached to the hydrogel carrier.
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JOURNAL OF MOLECULAR RECOGNITION
·
2017
·Vol. 30
·期 6
·e2606
·
IF 2.175
Lijiao Zhang,Ting Ren,Zechun Wang,Ruiyong Wang,Junbiao Chang
This study aims to investigate the interaction between 3 flavonoids (quercetin, apigenin, and naringenin) and fat mass and obesity-associated protein by fluorescence, ultraviolet-visible absorption spectroscopy, and molecular modeling. Results indicate that the intrinsic fluorescence of fat mass and obesity-associated protein can be quenched by the 3 flavonoids through a static quenching procedure. Thermodynamic analysis and molecular modeling results suggest that hydrophobic interaction and hydrogen bond forces play the major roles in the binding process. Moreover, results also show that the rank order of quenching constant and binding constant is quercetin > apigenin > naringenin.
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TALANTA
·
2017
·
IF 4.162
Jie Zhang,Liu Yang,Mian Wu,Xiafei Guo,Baizhao Zeng,Faqiong Zhao
A poly(3-methylthiophene-carbazole)/graphene oxide composite coating was prepared on a stainless steel wire through electrochemical method. It showed high extraction efficiency, thermal stability and durability than those of corresponding single-component coatings due to the synergistic effect of different components. The resulting fiber was used for the headspace solid phase microextraction of octanal , nonanal , decanal , undecanol and dodecanol , followed by gas chromatography detection. The results showed that their GC peak areas were linear to their concentrations in the ranges of about 0.05–100 μg L −1 , the detection limits were 22.6–40.5 ng L −1 (S/N=3). The run-to-run RSD was smaller than 4.5% (n=4), and the fiber-to-fiber RSD was 4.0–9.3% (n=4). The method was successfully applied to the determination of the five analytes in candy, orange fruit and flower.
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