ENVIRONMENTAL POLLUTION
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2015
·
IF 4.143
Dong Zhou,Jie Yang,Hui Li,Qiang Lu,Yong-di Liu,Kuang-fei Lin
In order to understand how bisphenol A (BPA) exposure acts on the evolutionary dynamics of populations and changes of stress response across generations, the model animal Caenorhabditis elegans was used to conduct the multigenerational testing. Multiple endpoints at the physiological (growth, reproduction, and locomotion behaviors) and molecular (stress-related gene expressions) levels were examined by multigenerational exposure to low-concentration BPA (0.001–10 μM) across four generations. The results showed that changes of physiological-level effects across four generations varied in magnitude and direction, depending on the exposure concentrations. C. elegans individuals in the first generation grew smaller, moved slower, and produced less offsprings than the controls by BPA exposure. As for each trait tested, the first generation response could be commonly mirrored in the subsequent generations at the highest concentration of 10 μM. However, at lower concentrations, response of parental generation was a relatively poor predictor of the effects on progeny, as acclimation or cumulative damage could occur in the subsequent generations. The integrated gene expression profiles visually illustrated that the tested gene expressions at low concentrations (0.001–0.01 μM) were more obviously changed in both G 1 and G 4 generations, and the G 1 generation showed a much greater degree of increase in stress-related gene expressions than the G 4 generation. The multigenerational toxicity data emphasize the need of considering biological effects over multiple generations to conduct accurate assessment of environmental risks of toxicants on population dynamics.
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高影响因子
PROGRESS IN ORGANIC COATINGS
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2015
·
IF 2.358
Mehdi Derradji,Noureddine Ramdani,Tong Zhang,Jun Wang,Lin-dan Gong,Xiao-dong Xu,Zai-wen Lin,Abdelkhalek Henniche,H.K.S. Rahoma,Wen-bin Liu
A new type of nanocomposites was prepared by reinforcing a high performance bisphenol-A phthalonitrile resin with different amounts of silane surface modified titania nanoparticles. The effect of the nanofillers amount on the thermal, mechanical, and corrosion protective properties was investigated. Thermogravimetric analysis shows that the starting decomposition temperatures and the residual weight at 800 °C were highly improved upon adding the nanofillers. At 6% nanoloading, the glass transition temperature and the storage modulus were considerably enhanced reaching 364.4 °C and 3.2 GPa, respectively. The tensile strength and modulus as well as the microhardness values increased with the increasing of the nanoparticles amount. The tensile modulus calculations were investigated using Series, Halpin–Tsai, and Kerner models. Haplin–Tsai model was found to reproduce the experimental data with the best accuracy. Finally, results from electrochemical impedance spectroscopy revealed that the neat resin and its related nanocomposites offer excellent corrosion protective properties.
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高影响因子
POLYMER
·
2015
·
IF 3.562
Jiuduo Xu,Weihai Zhang,Qiyang Jiang,Jianxin Mu,Zhenhua Jiang
A series of novel copoly(aryl ether sulfone)s with polydimethyl (PDMS) and double-decker-shaped silsesquioxane (DDSQ) in the main chain were synthesized by nucleophilic substitution polymerization approach. Dihydroxy terminated eugenosiloxanes (2OH-PDMS-n) and 3,13-di(2-methoxy-4-propylphenol)octaphenyl DDSQ (2OH-DDSQ) were synthesized. These two difunctional oligomers were used to copolymerize with 4-fluorophenyl sulfone to obtain poly(aryl ether sulfone) containing cage and linear organosiloxane (Si-PES) through one-step high-temperature solution method. Si-PES with multiple PDMS and DDSQ contents in the main chains were obtained by adjusting the molecular weight of 2OH-PDMS-n and controlling the molar ratio of 2OH-DDSQ to 2OH-PDMS-n. The dielectric constants sharply decreased as organosiloxane was introduced compared with traditional PES which the lowest value was achieved at 5% DDSQSi–PES (2.36 at 1 MHz). In addition, enhanced hydrophobic capacity peaks were obtained at 50% DDSQSi-PES surface hydrophobicity (113°) as the synergies of both linear organosiloxane and DDSQ. Furthermore, thermal and crystallization behaviors , as well as surface properties, were investigated.
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ANALYTICA CHIMICA ACTA
·
2015
·
IF 4.513
Xiaoyun Lin,Yongnian Ni,Serge Kokot
An electrochemical biosensor capable of indirect detection of DNA damage induced by any one of the three endocrine-disrupting compounds (EDCs) – bisphenol A (BPA), 4-nonylphenol (NP) and 4- t -octylphenol (OP), has been researched and developed. The methylene blue (MB) dye was used as the redox indicator. The glassy carbon electrode (GCE) was modified by the assembled dsDNA/graphene oxide-chitosan/gold nano-particles to produce a dsDNA/GO-CS/AuNPs/GCE sensor. It was characterized with the use of electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and scanning electron microscopy (SEM) techniques. The loading/release of the MB dye by the dsDNA/GO-CS/AuNPs film was investigated, and the results showed that the process was reversible. Based on this, the sensor was used to measure the difference between the loading capabilities of intact and damaged dsDNA in the films. The sensor was then successfully applied to detect DNA damage electrochemically. The differential pulse voltammetry (DPV) peak current ratio for MB, observed before and after DNA damage, increased linearly in the presence the BPA, NP or OP compounds; the treatment range was 10–60 min, and the respective damage rates were 0.0069, 0.0044 and 0.0031 min −1 , respectively. These results were confirmed by the binding constants: 2.09 × 10 6 M −1 (BPA-DNA), 1.28 × 10 6 M −1 (NP-DNA) and 9.33 × 10 5 M −1 (OP-DNA), all of which were obtained with the use of differential pulse stripping voltammetry (DPSV).
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高影响因子
MICROCHIMICA ACTA
·
2015
·Vol. 183
·期 1
·431-439
·
IF 3.741
Deng Chun,Zhong Yaping,He Yu,Ge Yili,Song Gongwu
We describe a kind of molecularly imprinted polymer (MIP)-based fluorescent sensor. It was obtained by anchoring a surface-imprinted MIP layer for the model analyte bisphenol A (BPA) onto the surface of fluorescent silver nanoclusters (Ag-NCs). The MIP-coated Ag-NCs were synthesized by the sol-gel technique. The hyphenation of the fluorescence of Ag-NCs with MIP technology expands the use of fluorescent nanomaterials in sensing and recognition. BPA is capable of quenching the fluorescence of the Ag-NCs, and the reduction in fluorescence intensity is related to the concentration of BPA in the 0.2 μg mL −1 to 2 mg L −1 range. The detection limit for BPA is 0.02 μg mL −1 , and the recovery of BPA from spiked milk and juice samples ranged from 92.5 to 108.5 %. The MIP-coated Ag-NCs presented here are characterized by their ease of synthesis, selectivity and sensitivity. In our perception, this approach can be extended to numerous other analytes.
A molecularly imprinted polymer (MIP)-based fluorescence assay was developed by anchoring the MIP layer on the surface of silver nanoclusters via a surface molecular imprinting process, with bisphenol A as the model analyte.
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MATERIALS LETTERS
·
2015
·
IF 2.489
Mehdi Derradji,Noureddine Ramdani,Tong Zhang,Jun Wang,Zai-wen Lin,Ming Yang,Xiao-dong Xu,Wen-bin Liu
A new kind of nanocomposites based on phthalonitrile resin reinforced with silicon nitride (SiN) nanoparticles was prepared by a hot compression molding technique. For different weight ratios ranging between 0% and 15%, the effect of nano-SiN particles on the thermal and thermomechanical properties has been studied. Results from thermal analysis revealed that the starting decomposition temperature and the residual weight at 800 °C were highly improved upon adding the reinforcing phase. At the maximum nano-SiN loading, dynamic mechanical analysis showed an enhancement in both storage modulus and glass transition temperature , reaching 4 GPa and 360 °C respectively. Scanning electron microscope analysis confirmed that these improvements are essentially attributed to the good dispersion and adhesion between the particles and the resin thanks to the particles treatment with silane coupling agent.
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2015
·Vol. 26
·期 6
·581-588
·
IF 1.757
Tiantian Feng,Jun Wang,Hui Wang,Noureddine Ramdani,Liwu Zu,Wenbin Liu,Xiaodong Xu
A series of fluorene-based benzoxazine copolymers were synthesized from the mixture of 9,9-bis(4-hydroxyphenyl)fluorene and bisphenol A, and 4,4′-diaminodiphenyloxide and paraformaldehyde. And the cured polybenzoxazine films derived from these copolymers were also obtained. Fourier transform infrared spectroscopy (FTIR) and hydrogen nuclear magnetic resonances confirmed the structure of these benzoxazines. Their molecular weight was estimated by gel permeation chromatography. The curing behavior of the precursors was monitored by FTIR and differential scanning calorimetry. Dynamic mechanical analysis and thermogravimetric analysis were performed to study the thermal properties of the cured polymers. The cured polybenzoxazines exhibit excellent heat resistance with glass transition temperatures ( T g ) of 286–317°C, good thermal stability along with the values of 5% weight loss temperatures ( T 5 ) over 340°C, and high char yield over 50% at 800°C. The mechanical properties of the cured polymers were also measured by bending tests. Copyright © 2015 John Wiley & Sons, Ltd.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2015
·Vol. 19
·期 6
·1571-1578
·
IF 2.446
Zhao Jia,Ma Yanhui,Hou Xiaodong,Li Liqing,Zheng Peifeng,Li Chunya
A novel 1-[3-(tert-butoxycarbonylamino)propyl]-3-[3-(N-pyrrole)propyl]imidazolium tetrafluoroborate ionic liquid was successfully synthesized and was used as functional monomer to electrochemically fabricate a polymer film modified glassy carbon electrode (Poly-IL/GCE). Morphology and the interfacial property of Poly-IL/GCE were examined with scanning electron microscope and electrochemical impedance spectroscopy, respectively. Bisphenol A (BPA) was chosen as a model compound to investigate the sensing performance of Poly-IL/GCE using voltammetry. The oxidation peak currents of BPA at the Poly-IL/GCE exhibit a linear response to its concentration in the range of 1.0 × 10 –8 –1.0 × 10 –5 M. The detection limit is calculated to be 4.0 × 10 –9 M (S/N = 3). The Poly-IL/GCE was successfully applied to analysis BPA leaching from drinking water bottle. The results are consistent with that of high-performance liquid chromatography.
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高影响因子
MATERIALS & DESIGN
·
2015
·
IF 3.501
Mehdi Derradji,Noureddine Ramdani,Tong Zhang,Jun Wang,Tian-tian Feng,Hui Wang,Wen-bin Liu
A new type of composite based on phthalonitrile resin reinforced with silicon carbide (SiC) microparticles was prepared. For various weight ratios ranging between 0% and 20%, the effect of the micro-SiC particles on the mechanical and thermal properties has been studied. Results from thermal analysis revealed that the starting decomposition temperature and the residual weight were significantly improved upon adding the reinforcing phase. At the maximum micro-SiC loading, dynamic mechanical analysis (DMA) showed an important enhancement in both the storage modulus and glass transition temperature ( T g ), reaching 3.1 GPa and 338 °C, respectively. The flexural strength and modulus as well as the microhardness were significantly enhanced by adding the microfillers. Tensile test revealed enhancements in the composites toughness upon adding the microparticles. Polarization optical microscope (POM) and scanning electron microscope (SEM) analysis confirmed that mechanical and thermal properties improvements are essentially attributed to the good dispersion and adhesion between the particles and the resin.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2015
·
IF 4.513
Libo Li,Bin Yu,Xueping Zhang,Tianyan You
A novel Ru ( bpy ) 3 2 + -based electrochemiluminescence (ECL) sensing platform, using N-doped carbon nanodots (N–C dots) as co-reactant, was established for the sensitive and selective detection of bisphenol A (BPA). N–C dots not only could enhance the ECL signal, but also significantly improved the reproducibility and stability of Ru ( bpy ) 3 2 + ECL system. The developed ECL sensing system was sensitive to detect BPA based on its efficient quenching effect on Ru ( bpy ) 3 2 + / N − C dots. The N–C dots-enhanced ECL mechanism and BPA-quenched ECL mechanism were investigated. Under the optimum conditions, the inhibited ECL intensity was in good linear relationship versus the concentration of BPA in the range of 0.03–1.0 μM with the detection limit of 10 nM. The relative standard deviation (RSD) for 25 successive measurements with one sensor was 1.1% and for eight different sensors was 2.5%, respectively. The fabricated sensing platform was successfully applied for the detection of BPA in baby bottle and nipple, and relatively satisfactory recoveries were obtained.
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Analytical Methods
·
2015
·Vol. 7
·期 12
·5186-5192
·
IF 1.821
Nuo Duan,Hui Zhang,Yu Nie,Shijia Wu,Tingting Miao,Jie Chen,Zhouping Wang
We report a method for trace detection of bisphenol A (BPA) based on fluorescence resonance energy transfer (FRET) between lanthanide-doped KGdF4 nanoparticles (KGdF4:Tb3+ NPs) as a donor, and gold nanoparticles (AuNPs) that act as an acceptor. The KGdF4:Tb3+ NPs were modified with an aptamer recognizing BPA, and AuNPs were modified with the complementary DNA (cDNA) of the aptamer. The donor–acceptor pair was fabricated by hybridizing the aptamers and their cDNA. Thus, fluorescence of the KGdF4:Tb3+ NPs could be quenched due to the good overlap between the KGdF4:Tb3+ NP fluorescence emission and the AuNP absorption spectrum. However, on addition of BPA, the aptamers preferentially bound to BPA, forming KGdF4:Tb3+ NP–aptamer–BPA complexes. As a result, the FRET was disrupted, and the fluorescence was restored. The recovered fluorescence of the KGdF4:Tb3+ NPs was linearly proportional to the concentration of BPA in the range of 0.5 to 100 ng mL−1, with detection limits as low as 0.16 ng mL−1. The assay was applied to real samples, and the results were consistent with the results obtained using high performance liquid chromatography (HPLC) methods. We presume that this strategy can be extended to the detection of other contaminants by simply substituting the aptamer.
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RSC Advances
·
2015
·Vol. 5
·期 25
·19048-19057
·
IF 3.84
JiaQin Sun,Wei Wei,YaZhen Xu,JieHao Qu,XiangDong Liu,Takeshi Endo
Five commercially available amines: m-phenylenediamine (A1), m-xylylenediamine (A2), isophorone diamine (A3), trimethylhexamethylenediamine (A4), and 4,4′-diaminodiphenyl sulfone (A5), were examined as nucleophilic hardeners for bis-benzoxazine monomers based on aniline paired with bisphenol-A (BA-a) or bisphenol-F (BF-a). The reactivities and reaction mechanisms of their mixtures with BA-a were investigated using FTIR and NMR spectroscopy, DSC, and HPLC techniques. It was found that BA-a rapidly cured with the amines upon heating at 120 °C or 150 °C. The cure rate was similar to the amine/epoxy curing process in practical uses, and significantly faster than the ring-opening polymerization of bulk BA-a. The possible reaction mechanism was supported by the experimental results and includes three successive steps: (i) nucleophilic substitution at the carbon atom (O–C–N) in the oxazine ring by the amine, (ii) thermal decomposition of the resulting aminomethanaminium structure, and (iii) electrophilic addition of the newly formed iminium ion with the aromatic ring to form stable aminomethylphenol structures. These findings are helpful to improve the thermosetting resins in terms of their chemical structure, material properties, and processability.
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