MICROCHIMICA ACTA
·
2015
·Vol. 183
·期 1
·319-327
·
IF 3.741
Shi Dechao,Yan Fanyong,Zhou Xuguang,Zheng Tancheng,Shi Yangyang,Fu Weigui,Chen Li
We describe core-shell structured magnetic chitosan microspheres (Rho-MCS) that were modified with a rhodamine spirolactam fluorescent probe. They are shown to be a viable fluorescent probe for the determination of mercury ion, and for its removal and preconcentration. The microspheres were characterized by FTIR, thermogravimetric analysis and high-resolution digital images, and these confirmed the successful loading with rhodamine probe. The microspheres represent excellent bare-eye colorimetric and fluorescent turn on probes for Hg(II) via a mechanism based on chelation-enhanced fluorescence. Hg(II) can be quantified with a limit of detection of 15 nM. The effects of pH, temperature, contact time and initial concentration on adsorption were also investigated. The results indicate that Rho-MCS possess high adsorption capacity (337 mg g −1 ) and superb removal capability (up to 97 %). A kinetic study shows that the adsorption mechanism can be described by a pseudo second-order equation, while the adsorption isotherm can be fit to a Langmuir model. Hg(II)-loaded Rho-MCS can be recycled by addition of ethylenediaminetetraacetic acid (EDTA). The capability for removal of Hg(II) was maintained above 86 % after five consecutive adsorption-desorption cycles.
The Rho-MCS microspheres modified with rhodamine spirolactam are shown to be viable turn-on fluorescence probe for the determination of Hg(II) and excellent adsorbent for its removal. It still maintains highly adsorption capacity after several regeneration cycles.
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CATALYSIS LETTERS
·
2015
·Vol. 145
·期 10
·1913-1921
·
IF 2.307
Wu Jing,Zhi Yunfei,Shan Shaoyun,Su Hongying,Wu Shuisheng,Jia Qingming
Abstract Polypyrrole(PPy) supported Cr(III)(salen)Cl catalyst was prepared for alternating copolymerization of cyclohexene oxide and carbon dioxide. The supported catalyst and the copolymerization products were characterized by FTIR, XRD, XPS, ICP-MS, SEM, TEM, NMR, gel permeation chromatography, thermogravimetric analysis and differential scanning calorimetry. After the study, we concluded that the homogeneous Cr(III)(salen)Cl is successfully supported on the PPy, and its catalytic performance is much better than the homogeneous one. Moreover, the copolymerization product catalyzed by PPy-Cr(III)(salen)Cl exhibits higher molecular weight, narrower molecular weight distribution, superior thermal stability and selectivity. Graphical Abstract
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JOURNAL OF MATERIALS SCIENCE
·
2015
·Vol. 50
·期 16
·5466-5474
·
IF 2.371
Chen Jiucun,Liu Yinqin,Li Wenjun,Wu Chao,Xu Liqun,Yang Huan
In this work, nanostructured polystyrene/polyaniline/reduced graphene oxide (PS–PANI/rGO) hybrid materials based on in situ reduction of graphene oxide with ascorbic acid and self-assembly have been successfully prepared for electrochemical supercapacitor and Na-ion battery applications. The supercapacitor based on the PS–PANI/rGO as an electrode material exhibits a specific capacitance of 180 F g −1 at a current density of 0.5 A g −1 from −0.4 to 1.0 V and a high energy density of 49 W h kg −1 at the power density of 352.8 W kg −1 . Moreover, the nanostructured PS–PANI/rGO has a good cycle stability (74 % capacitance retention after 5000 cycles), indicating its future potential application in electrochemical energy storage. The material is further used as an anode in Na-ion batteries, and the results show that the porous nanostructured PS–PANI/rGO delivers a high capacity of 155 mA h g −1 and keeps over 150 charge–discharge cycles at a constant current of 100 mA g −1 (0.5 C).
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ARCHIVES OF PHARMACAL RESEARCH
·
2015
·
IF 2.046
Zhang Fengsu,Cai Hao,Liu Xunhong,Chen Fei,Yang Nianyun,Hou Ya,Ma Yang,Luo Yiyuan,Liu Juanxiu
To analyze the components of the fatty oil extracted from Antrodia camphorata fungus powder and to evaluate the antioxidant activity of A. camphorata crude oil. A derivatized gas chromatography mass spectrometry (GC–MS) was developed for the quantification of 19 fatty acids in extracts of A. camphorata obtained by supercritical carbon dioxide (SC-CO 2 ). Good separation was obtained under the optimized chromatographic conditions and 19 target compounds after methyl-esterification were identified by GC–MS on a HP-VOC capillary column (60 m × 320 μm × 1.8 μm) with an initial temperature set at 80 °C. The validity of the established method was examined experimentally with good linearity, intra-assay precisions, repeatability, stability and recovery. The antioxidant activity of A. camphorata crude oil was evaluated by 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical-scavenging assay. Nineteen fatty acids showed good linearity over the tested ranges (r > 0.9956) and the recovery ranged from 93.47 to 104.89 %. The crude oil extracted from A. camphorata fungus powder also revealed its antioxidant activity. It was the report about simultaneous determination of 19 fatty acids in A. camphorata and antioxidant activity of its crude oil for the first time. The established method might also be utilized for the investigation of edible plant materials and agricultural products containing fatty acids.
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PubMed
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2014
·Vol. 18
·期 12
·3463-3469
·
IF 2.234
Chen Ya,Huang Yihan,Guo Dongmei,Chen Cui,Wang Qinghong,Fu Yingzi
A sensitive electrochemical method was explored for chiral recognition of 3,4-dihydroxyphenylalanine (DOPA) enantiomers based on immobilization of β -cyclodextrin ( β -CD) onto the nanocomposite comprising multiwalled carbon nanotubes (MWCNTs) and ionic liquid (IL) 1-butyl-3-methylimidazolium hexafluorophosphate (BIMIMPF 6 ) modified glassy carbon electrode ( β -CD/MWCNTs-IL/GCE). The combination of ionic liquid and carbon nanotubes could create unique nanomaterials which facilitated the electron transfer. In addition, β -CD was brought in to act as the chiral selector for DOPA enantiomers recognition. The immobilization process of β -CD/MWCNTs-IL/GCE was monitored by cyclic voltammetry, electrochemical impedance spectroscopy, and scanning electron microscopy. The chiral interface ( β -CD/MWCNTs-IL/GCE) was employed to discriminate DOPA enantiomers via differential pulse voltammetry. The results indicated that the proposed sensor exhibited a stronger electrochemical response toward D-DOPA over the linear range from 4.0 × 10 −3 to 4.0 × 10 −9 mol L −1 and the detection limit was 1.2 × 10 −9 mol L −1 (S/N = 3). This work provided an available platform for enantioselective recognition of DOPA enantiomers based on the nanocomposite.
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MICROCHIMICA ACTA
·
2014
·Vol. 181
·期 11
·1361-1367
·
IF 3.719
Luo Xubiao,Wu Wenbin,Deng Fang,Chen Dezhi,Luo Shenglian,Au Chaktong
Silica-coated, thiol-enriched and zinc-doped CdS quantum dots (SiO 2 -S-Zn-CdS QDs) were fabricated by a sol–gel process and used as fluorescent probe for imaging and monitoring of intracellular Cd(II) and Zn(II) in endophytes in the “turn-on” mode. There is a linear relationship between fluorescence intensity and the concentration of Zn(II) in the 3.5 – 23.2 μM concentration range and with a detection limit of 2.0 μM. The probe also responds well to Cd(II) in the 0.3 – 26 μM concentration range and the detection limit is 0.1 μM. Due to its negligible cytotoxicity, fair sensitivity and good photostability, the quantum dot probe presented here is a promising tool for fluorescent imaging of intracellular Zn(II) or Cd(II).
The SiO 2 -S-Zn-CdS QDs “turn-on” fluorescent probe shows superior selectivity for Zn 2+ and Cd 2+
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POLYMER BULLETIN
·
2014
·Vol. 71
·期 7
·1857-1873
·
IF 1.491
Shi Jin,Shi Jun,Feng Desheng,Yue Pei,Cao Shaokui
CaCO 3 /aliphatic poly(urethane-amine) (PUA)/sodium polystyrene sulfonate (PSS) hybrid composites with dual-responsive controlled drug delivery property had been prepared via electrostatic interaction. Aliphatic PUA and PSS were employed as smart polyelectrolytes. PSS was also served as crystal growth additive to control the morphology of CaCO 3 microparticles. The electrostatic interaction between PSS and aliphatic PUA under weak-acid condition improved the bonding force between PSS-doped CaCO 3 microparticles and polyelectrolytes. pH-/thermo-responsive drug delivery property and the high drug loading capacity (around 90 %) could be achieved from the prepared hybrid composites. More importantly, the relative content of CaCO 3 microparticles and polyelectrolytes had a significant effect on the morphology and controllable release properties of the hybrid composites. The smart drug release mechanism of the hybrid composites was also analyzed by fitting the cumulative release data to Retger–Peppas equation.
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CELLULOSE
·
2013
·Vol. 21
·期 1
·383-394
·
IF 3.476
Liu Chun-Yan,Zhong Gan-Ji,Huang Hua-Dong,Li Zhong-Ming
Ultralight and highly porous cellulose was fabricated via cellulose/sodium hydroxide/urea aqueous solution followed by gelation, coagulation and freeze-drying in the current work. The water content and freeze rate of cellulose coagulated sample are two crucial factors controlling the morphology, density and porosity of porous cellulose, which led to an interesting morphological transition from three dimensional nanofibrillar network to sheet network in porous cellulose. It was proposed that the aggregation and assembly of cellulose-rich phase and crystallization of water-rich phase were closely related to this transition. Based on this concept, a series of cellulose materials with densities varied from 0.129 to 0.330 g cm −3 and corresponding porosities ranged from 91.4 to 78.0 %, were obtained. The porous celluloses showed a good ductility (strain to fracture is more than 30 %) and high modulus, which also could be tuned by porous morphology. The new understanding on the morphological transition in porous cellulose could be beneficial for the development of “green” porous materials.
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高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2013
·Vol. 24
·期 2
·283-290
·
IF 1.174
Han J. G.,Xiang Y. Q.,Zhu Y.
Gold nanoparticles (Au NPs) have a good reputation in antibacterial property, but bad in stability. In order to get the materials which have the continuous antibacterial performance, we firstly try composites which combine waterborne polyurethane (WPU) with Au NPs. The WPU was previously synthesized by the method of self-emulsifying polymerization. Au NPs were added to the emulsion comprising the WPU previously synthesized to yield the composite WPU/Au NPs. On one hand, the obtained composites were characterized by UV–Vis, Fourier transform infrared, transmission electron microscopy and X-ray photoelectron spectroscopy, to demonstrate the formation of the WPU/Au NPs hybrids and improvement in stability of Au NPs. The results indicate that the size level of the Au NPs which exist in composite present nanometer and spherical structure; the existence of the WPU in composite has certain stabilizing effect to the Au NPs, it also has improved the dispersion. On the other hand, bacteriostatic test has been taken on the composite by using Escherichia coli (E) and Staphylococcus aureus (S), we come a conclusion that WPU/Au NPs composites can be used as antibacterial material.
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CHROMATOGRAPHIA
·
2013
·Vol. 76
·期 23
·1641-1647
·
IF 1.437
Yang Qing,Chen Xiaoqing,Jiang Xinyu
A novel, efficient, and environmentally friendly method—supramolecular solvent liquid–liquid microextraction (SMS-LLME) combined with high-performance liquid chromatography (HPLC)—was first established for the determination of p -nitrophenol and o -nitrophenol in water samples. Several important parameters influencing extraction efficiency, such as the type and volume of extraction solvent, pH of sample, temperature, salt effect, extraction time, and stirring rate, were optimized in detail. Under the optimal conditions, the enrichment factor was 166 for p -nitrophenol and 160 for o -nitrophenol, and the limits of detection by HPLC were 0.26 and 0.58 μg L −1 , respectively. Excellent linearity with coefficients of correlation from 0.9996 to 0.9997 was observed in the concentration range of 2–1,000 μg L −1 . The ranges of intra- and interday precision ( n = 5) at 100 μg L −1 of nitrophenols were 5.85–7.76 and 10.2–11.9 %, respectively. The SMS-LLME method was successfully applied for preconcentration of nitrophenols in environmental water samples.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2013
·Vol. 21
·期 3
·2122-2131
·
IF 2.618
Ou Hua-Se,Wei Chao-Hai,Deng Yang,Gao Nai-Yun,Ren Yuan,Hu Yun
A novel dual coagulant system of polyaluminum chloride sulfate (PACS) and polydiallyldimethylammonium chloride (PDADMAC) was used to treat natural algae-laden water from Meiliang Gulf, Lake Taihu. PACS (Al n (OH) m Cl 3n-m-2k (SO 4 ) k ) has a mass ratio of 10 %, a SO 4
2− /Al 3
+ mole ratio of 0.0664, and an OH/Al mole ratio of 2. The PDADMAC ([C 8 H 16 NCl] m ) has a MW which ranges from 5 × 10 5 to 20 × 10 5 Da. The variations of contaminants in water samples during treatments were estimated in the form of principal component analysis (PCA) factor scores and conventional variables (turbidity, DOC, etc.). Parallel factor analysis determined four chromophoric dissolved organic matters (CDOM) components, and PCA identified four integrated principle factors. PCA factor 1 had significant correlations with chlorophyll-a ( r = 0.718), protein-like CDOM C1 (0.689), and C2 (0.756). Factor 2 correlated with UV 254 (0.672), humic-like CDOM component C3 (0.716), and C4 (0.758). Factors 3 and 4 had correlations with NH 3 -N (0.748) and T-P (0.769), respectively. The variations of PCA factors scores revealed that PACS contributed less aluminum dissolution than PAC to obtain equivalent removal efficiency of contaminants. This might be due to the high cationic charge and pre-hydrolyzation of PACS. Compared with PACS coagulation (20 mg L −1 ), the removal of PCA factors 1, 2, and 4 increased 45, 33, and 12 %, respectively, in combined PACS–PDADMAC treatment (0.8 mg L −1 + 20 mg L −1 ). Since PAC contained more Al (0.053 g/1 g) than PACS (0.028 g/1 g), the results indicated that PACS contributed less Al dissolution into the water to obtain equivalent removal efficiency.
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PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2013
·Vol. 15
·期 10
·1-10
·
IF 2.175
Li Jia,An Yan-Li,Zang Feng-Chao,Zong Shen-Fei,Cui Yi-Ping,Teng Gao-Jun
We report a composite nanoprobe based on silica-coated magnetic nanoparticles (NPs) for distinguishing breast cancers at different HER2 statuses. The nanoprobe has a core–shell structure, with Fe 3 O 4 NPs as the magnetic core and dye-embedded silica as the fluorescent shell, whose average size is about 150 nm. Besides, the outmost surfaces of the probes were modified with specific antibodies to endow the probe with a targeting ability. With such a structure, the nanoprobe can accomplish dual mode targeting of human breast cancer cells based on fluorescence and magnetic resonance imaging (MRI). In the experiments, three human breast cancer cell lines were used to test the targeting ability of the nanoprobe. Specifically, SKBR3 cells with a high HER2 expression level were used as the model target cells, while MCF7 cells with a lower HER2 expression levels and HER2-negative MDA-MB-231 cells were used as the controls. Both the fluorescence and MRI imaging results confirmed that the nanoprobe can distinguish three cancer cell lines with different HER2 expression levels. With the dual mode imaging and specific targeting properties, we anticipate that the presented nanoprobe may have a great potential in the diagnosis and treatment of cancerous diseases.
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