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  Subjects -> CHEMISTRY (Total: 841 journals)
    - ANALYTICAL CHEMISTRY (50 journals)
    - CHEMISTRY (593 journals)
    - CRYSTALLOGRAPHY (21 journals)
    - ELECTROCHEMISTRY (25 journals)
    - INORGANIC CHEMISTRY (41 journals)
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    - PHYSICAL CHEMISTRY (67 journals)

CHEMISTRY (593 journals)                  1 2 3 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 8)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26)
ACS Catalysis     Full-text available via subscription   (Followers: 34)
ACS Chemical Neuroscience     Full-text available via subscription   (Followers: 18)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 23)
ACS Macro Letters     Full-text available via subscription   (Followers: 23)
ACS Medicinal Chemistry Letters     Full-text available via subscription   (Followers: 39)
ACS Nano     Full-text available via subscription   (Followers: 236)
ACS Photonics     Full-text available via subscription   (Followers: 11)
ACS Synthetic Biology     Full-text available via subscription   (Followers: 21)
Acta Chemica Iasi     Open Access   (Followers: 2)
Acta Chimica Sinica     Full-text available via subscription   (Followers: 1)
Acta Chimica Slovaca     Open Access   (Followers: 1)
Acta Chromatographica     Full-text available via subscription   (Followers: 9)
Acta Facultatis Medicae Naissensis     Open Access  
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 7)
Adsorption Science & Technology     Full-text available via subscription   (Followers: 5)
Advanced Functional Materials     Hybrid Journal   (Followers: 50)
Advanced Science Focus     Free   (Followers: 3)
Advances in Chemical Engineering and Science     Open Access   (Followers: 55)
Advances in Chemical Science     Open Access   (Followers: 13)
Advances in Chemistry     Open Access   (Followers: 14)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 18)
Advances in Drug Research     Full-text available via subscription   (Followers: 22)
Advances in Enzyme Research     Open Access   (Followers: 9)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 19)
Advances in Nanoparticles     Open Access   (Followers: 15)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 15)
Advances in Polymer Science     Hybrid Journal   (Followers: 41)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 19)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 5)
Advances in Science and Technology     Full-text available via subscription   (Followers: 12)
African Journal of Bacteriology Research     Open Access  
African Journal of Chemical Education     Open Access   (Followers: 2)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 3)
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 68)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 14)
American Journal of Chemistry     Open Access   (Followers: 26)
American Journal of Plant Physiology     Open Access   (Followers: 14)
American Mineralogist     Hybrid Journal   (Followers: 14)
Analyst     Full-text available via subscription   (Followers: 40)
Angewandte Chemie     Hybrid Journal   (Followers: 224)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 213)
Annales UMCS, Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 3)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 3)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 4)
Annual Reports Section B (Organic Chemistry)     Full-text available via subscription   (Followers: 8)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 12)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 15)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
Antiviral Chemistry and Chemotherapy     Hybrid Journal  
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 7)
Applied Spectroscopy     Full-text available via subscription   (Followers: 23)
Applied Surface Science     Hybrid Journal   (Followers: 28)
Arabian Journal of Chemistry     Open Access   (Followers: 6)
ARKIVOC     Open Access   (Followers: 2)
Asian Journal of Biochemistry     Open Access   (Followers: 1)
Atomization and Sprays     Full-text available via subscription   (Followers: 4)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 2)
Avances en Quimica     Open Access   (Followers: 1)
Biochemical Pharmacology     Hybrid Journal   (Followers: 10)
Biochemistry     Full-text available via subscription   (Followers: 295)
Biochemistry Insights     Open Access   (Followers: 6)
Biochemistry Research International     Open Access   (Followers: 6)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 9)
Bioinspired Materials     Open Access   (Followers: 5)
Biointerface Research in Applied Chemistry     Open Access   (Followers: 2)
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 1)
Biomacromolecules     Full-text available via subscription   (Followers: 19)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Biomedical Chromatography     Hybrid Journal   (Followers: 6)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 3)
BioNanoScience     Partially Free   (Followers: 5)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 120)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 97)
Bioorganic Chemistry     Hybrid Journal   (Followers: 10)
Biopolymers     Hybrid Journal   (Followers: 18)
Biosensors     Open Access   (Followers: 2)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 1)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 2)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 24)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 3)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 3)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 10)
Canadian Mineralogist     Full-text available via subscription   (Followers: 3)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 66)
Catalysis for Sustainable Energy     Open Access   (Followers: 7)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysts     Open Access   (Followers: 8)
Cellulose     Hybrid Journal   (Followers: 7)
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 1)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 13)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 70)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 23)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Full-text available via subscription   (Followers: 19)
Chemical Reviews     Full-text available via subscription   (Followers: 177)
Chemical Science     Open Access   (Followers: 22)
Chemical Technology     Open Access   (Followers: 16)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemical Week     Full-text available via subscription   (Followers: 8)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 57)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 26)
ChemInform     Hybrid Journal   (Followers: 8)
Chemistry & Biodiversity     Hybrid Journal   (Followers: 6)
Chemistry & Biology     Full-text available via subscription   (Followers: 30)
Chemistry & Industry     Hybrid Journal   (Followers: 5)
Chemistry - A European Journal     Hybrid Journal   (Followers: 142)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 15)
Chemistry and Materials Research     Open Access   (Followers: 18)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 5)
Chemistry in Education     Open Access   (Followers: 9)
Chemistry International     Hybrid Journal   (Followers: 2)
Chemistry Letters     Full-text available via subscription   (Followers: 44)
Chemistry of Materials     Full-text available via subscription   (Followers: 260)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 9)
Chemistry World     Full-text available via subscription   (Followers: 22)
Chemistry-Didactics-Ecology-Metrology     Open Access   (Followers: 1)
ChemistryOpen     Open Access   (Followers: 2)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 3)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 15)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 9)
ChemPlusChem     Hybrid Journal   (Followers: 2)
ChemTexts     Hybrid Journal  
CHIMIA International Journal for Chemistry     Full-text available via subscription   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 10)
Chromatographia     Hybrid Journal   (Followers: 24)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Cogent Chemistry     Open Access  
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 10)
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 7)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 4)
Combustion Science and Technology     Hybrid Journal   (Followers: 18)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Comprehensive Chemical Kinetics     Full-text available via subscription   (Followers: 2)
Comptes Rendus Chimie     Full-text available via subscription  
Comptes Rendus Physique     Full-text available via subscription   (Followers: 1)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 12)
Computational Chemistry     Open Access   (Followers: 2)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 9)
Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 2)
Copernican Letters     Open Access   (Followers: 1)
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 5)
Crystal Structure Theory and Applications     Open Access   (Followers: 3)
CrystEngComm     Full-text available via subscription   (Followers: 12)
Current Catalysis     Hybrid Journal   (Followers: 2)
Current Metabolomics     Hybrid Journal   (Followers: 5)
Current Opinion in Colloid & Interface Science     Hybrid Journal   (Followers: 9)
Current Research in Chemistry     Open Access   (Followers: 8)
Current Science     Open Access   (Followers: 58)
Dalton Transactions     Full-text available via subscription   (Followers: 22)
Detection     Open Access   (Followers: 2)
Developments in Geochemistry     Full-text available via subscription   (Followers: 2)
Diamond and Related Materials     Hybrid Journal   (Followers: 12)
Dislocations in Solids     Full-text available via subscription  
Doklady Chemistry     Hybrid Journal  
Drying Technology: An International Journal     Hybrid Journal   (Followers: 4)
Eclética Química     Open Access   (Followers: 1)
Ecological Chemistry and Engineering S     Open Access   (Followers: 4)
Ecotoxicology and Environmental Contamination     Open Access  
Educación Química     Open Access   (Followers: 1)
Education for Chemical Engineers     Hybrid Journal   (Followers: 5)
EJNMMI Radiopharmacy and Chemistry     Open Access  
Elements     Full-text available via subscription   (Followers: 2)
Environmental Chemistry     Hybrid Journal   (Followers: 8)
Environmental Chemistry Letters     Hybrid Journal   (Followers: 4)
Environmental Science & Technology Letters     Full-text available via subscription   (Followers: 5)
Environmental Science : Nano     Partially Free   (Followers: 1)
Environmental Toxicology & Chemistry     Hybrid Journal   (Followers: 17)

        1 2 3 | Last

Journal Cover Chemical Research in Chinese Universities
  [SJR: 0.255]   [H-I: 17]   [3 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1005-9040 - ISSN (Online) 2210-3171
   Published by Springer-Verlag Homepage  [2353 journals]
  • Molar surface Gibbs energy of the aqueous solution of ionic liquid [C 4
           mim][OAc]
    • Authors: Jing Tong; Xu Zheng; Jian Tong; Ye Qu; Lu Liu; Hui Li
      Abstract: Abstract The values of density and surface tension for aqueous solution of ionic liquid(IL) 1-butyl-3-methylimidazolium acetate([C4mim][OAc]) with various molalities were measured in the range of 288.15—318.15 K at intervals of 5 K. On the basis of thermodynamics, a semi-empirical model-molar surface Gibbs energy model of the ionic liquid solution that could be used to predict the surface tension or molar volume of solutions was put forward. The predicted values of the surface tension for aqueous [C4mim][OAc] and the corresponding experimental ones were highly correlated and extremely similar. In terms of the concept of the molar Gibbs energy, a new Eötvös equation was obtained and each parameter of the new equation has a clear physical meaning.
      PubDate: 2017-09-16
      DOI: 10.1007/s40242-017-6386-5
       
  • Preparation and biocompatibility of polyester films grafted with
           functional mPEG copolymers
    • Authors: Yanhong Ma; Yan Jiang; Yuan Liang; Weiwei Zhang; Hongwen Zhang; Rong Zhang
      Abstract: Abstract The surface of poly(ethylene terephthalate)(PET) films is inert, hydrophobic, and incompatible with blood, which has limited its practical bioapplication. In this case, better biocompatibility could be achieved by surface modification. In this study, the grafted copolymer of functional methoxypolyethylene glycol(mPEG) derivatives and styrene from the PET surfaces was prepared via surface-initiated atom transfer radical polymerization(SI-ATRP). The structures, composition, properties and surface morphology of the grafted PET films were characterized by Fourier transform infrared spectroscopy(FTIR), X-ray photoelectron spectroscopy(XPS), contact angle measurements and scanning electronic microscopy(SEM). The results indicate that the surface of the PET films has been covered by a thick targeted copolymer layer that converted the hydrophobic surface of PET to an amphiphilic surface. The bacterial adhesion and cell culture results indicate the copolymer-grafted PET film may possess good biocompatibility.
      PubDate: 2017-09-16
      DOI: 10.1007/s40242-017-7032-y
       
  • Comparison of the catalytic performances of different commercial cobalt
           oxides for peroxymonosulfate activation during dye degradation
    • Authors: Botao Zhang; Yang Zhang; Weixu Xiang; Yanguo Teng; Ying Wang
      Abstract: Abstract The catalytic performances of different commercial cobalt oxides(Co x O y , i.e., Co2O3, Co3O4, and CoO) for peroxymonosulfate(PMS) activation in dye degradation were compared in this study. The CoO/PMS system exhibited the highest catalytic oxidation performances with more than 96% methylene blue(MB) removal at 90 min. The concentration of dissolved cobalt ions from CoO was 1.474 mg/L at neutral pH and 5.231 mg/L at acidic pH at 90 min which accounted for the high MB removal and CoO activated PMS homogeneously compared to the associated CoSO4/PMS. Co3O4 and Co2O3 exhibited similar catalytic performances and characteristics. The MB removal in Co3O4/PMS and Co2O3/PMS system were more than 88% at neutral pH and over 64% at acidic pH, respectively, in 90 min. The concentration of dissolved cobalt ions from Co3O4 and Co2O3 was less than 0.018 mg/L at neutral pH and 0.036 mg/L at acidic pH at 90 min. The MB removal achieved by Co3O4/PMS and Co2O3/PMS were approximately three times higher than that achieved by their associated CoSO4/PMS systems and the heterogeneous catalysis played a principal role in the processes. According to scavenger experiments, the contributions of the hydroxyl radicals in the MB degradation were negligible compared to sulfate radicals in the CoO/PMS system. Hydroxyl radicals contributed one-third or more and sulfate radicals were the dominant oxidizing species in the Co3O4/PMS and Co2O3/PMS systems. Co x O y could also effectively activate PMS to generate free radicals for degradation of other dyes. The dyedegradation processes in Co3O4/PMS, Co2O3/PMS and CoSO4/PMS systems followed pseudo-first-order kinetic model and dye degradation rates in different systems were also compared.
      PubDate: 2017-09-16
      DOI: 10.1007/s40242-017-6413-6
       
  • Synthesis and biological activity of imidazo[4,5-c]quinoline derivatives
           as PI3K/mTOR inhibitors
    • Authors: Yanjie Li; Xingmin Zhang; Shengxiu Niu; Yanping Zhao; Lijuan Yang; Xiaowei Shao; Ensi Wang
      Abstract: Abstract A series of imidazo[4,5-c]quinoline derivatives(12a—12m) was synthesized with 2-amino-5-bromobenzoic acid and 4-nitrophenylacetonitrile as starting materials, 6-bromo-4-chloro-3-nitroquinoline as intermediate and Suzuki reaction and closure of the imidazolinone ring with triphosgene as key steps. The structures of the key intermediate and target compounds were confirmed by means of 1H NMR, 13C NMR and HRMS. These compounds show an interesting kinase profile as dual PI3K/mTOR tool compounds.
      PubDate: 2017-09-16
      DOI: 10.1007/s40242-017-7074-1
       
  • Swelling process of thin polymer film studied via in situ spectroscopic
           ellipsometry
    • Authors: Lin Xu; Zhiming Zou; Huanhuan Zhang; Tongfei Shi
      Abstract: Abstract The swelling process of thin polystyrene films in quantity was studied in this paper using the in situ spectroscopic ellipsometry. We systematically investigated the influence of film thickness on the swelling process of thin polystyrene films. The results show that in the case of high M w polystyrene(M w=400000), the curve of the swelling degree as a function of time discloses that the relaxation of the long polymer chains accompanies the diffusion of acetone molecules. The swelling process is via the Fickian relaxation mechanism. Both the values of the equilibrium swelling degree and the diffusion coefficient of acetone molecules in the polystyrene film decrease as the film thickness reduces under confinement. However, in the case of low M w PS(M w=4100), the dewetting process is so fast before the equilibrium of swelling that the whole swelling process cannot be observed.
      PubDate: 2017-09-16
      DOI: 10.1007/s40242-017-7075-0
       
  • Effect of synthetic method and reductant on the morphology and
           photocatalytic hydrogen evolution performance of Ru nanoparticles
    • Authors: Chao Kong; Yanxia Han; Lijie Hou; Dongping Chen; Bowan Wu
      Abstract: Abstract Ru nanoparticles were synthesized using the photoreduction and chemical reduction methods. Ru nanoparticles were used as a cocatalyst to develop a photocatalytic hydrogen evolution system sensitized by Eosin Y(EY), and the effects of the synthetic method and reductant on the morphology and photocatalytic hydrogen evolution per-formance of Ru nanoparticles were studied. The results indicated that Ru nanoparticles prepared by photoreduction and thermochemical reduction by ethanediol had a relatively uniform size, and the photoreduced Ru showed higher photocatalytic performance than Ru reduced by ethanediol and methanal. The amount of H2 evolution in 60 min over Ru(photoreduction)-EY was 1247.7 μmol, which was 13.6 and 14.3 times that over Ru prepared by chemical reduction methods under the same photoreaction conditions. The calculation of binding energies showed that a higher binding energy of Ru nanoparticles and glycol was one of the main reasons for the uniform size and low photocatalytic performance of Ru reduced by glycol. The results indicated that different preparation methods and reductants had a significant influence on the catalytic activity of Ru catalyst.
      PubDate: 2017-09-16
      DOI: 10.1007/s40242-017-6452-z
       
  • Heterogeneous h -BN@Cyclodextrin@Pd(II) nanomaterial: Fabrication,
           characterization and application as a highly efficient and recyclable
           catalyst for C—C coupling reactions
    • Authors: Rui Sang; Xu Cheng; Weijian Li; Pengfei Luo; Yong Zhang; Ruifang Nie; Li Hai; Yong Wu
      Abstract: Abstract An efficient and ligand-free method for the Suzuki and Heck cross-coupling reactions has been success-fully developed using h-BN-supported palladium as the catalyst. This green methodology represents a cost-effective and operationally convenient process for the synthesis of biaryls, stilbenes and acrylates. Wide scope of substrates, good to excellent yields, low reaction time, water as solvent, ligand-free, non-toxicity and recyclability of the catalyst are the main merits of these protocols. In addition, the h-BN@γ-CD@Pd(II) nanomaterial has been fully characte-rized by TG, SEM, IR, XRD, XPS and ICP-AES analysis. And it could be easily recovered and reused for at least nine times without any considerable loss of catalytic activity. Above all, this work demonstrates the possibility of using cyclodextrin-modified h-BN as an efficient support for the hydrophilic heterogeneous catalysts.
      PubDate: 2017-09-16
      DOI: 10.1007/s40242-017-6455-9
       
  • Thermodynamic Description of the MCl 2 -ThCl 4 (M: Mg, Ca, Sr, Ba) Systems
    • Authors: Mengya Xie; Xiang Li; Yaping Ding; Guoxin Zhang
      Abstract: Abstract The phase equilibria for the MCl2-ThCl4(M: Mg, Ca, Sr, Ba) binary systems were critically evaluated and optimized based upon the CALPHAD approach. The substitutional solution model(SSM) was used to describe the liquid phase. All the intermediate compounds were treated as stoichiometric compounds of which Gibbs energies comply with the Neumann-Kopp rule. Thermodynamic model parameters optimization for respective phases was conducted by the least squares minimization procedure with required input data available from experimental mea-surements. Satisfactory agreements between all calculated results and experimental data were achieved which demonstrates that thermodynamic databases for the MCl2-ThCl4(M: Mg, Ca, Sr, Ba) binary systems were ultimately derived in the present work allowing safe extrapolation into multi-component system for guiding relative industrial applications.
      PubDate: 2017-09-13
      DOI: 10.1007/s40242-017-7033-x
       
  • A New and Facile Strategy for Determination of Lead and Cadmium Using
           Silver Electrodes Manufactured from Digital Versatile Discs
    • Authors: Wenyu Cui; Lishuang Fan; Lin Geng; Maozhong An; Fujun Zhang
      Abstract: Abstract The use of a digital versatile disc(DVD)-based Ag electrode for the square-wave anodic stripping voltammetric determination of Pb2+ and Cd2+ was described. The effect of I– on the stripping analysis of Pb2+ and Cd2+ at Ag electrodes was first studied. I– significantly improved the stripping peaks of both Pb2+ and Cd2+. The square-wave voltammetric stripping response was linear over 5―50 μg/L for Pb2+ and Cd2+ with a deposition time of 118 s. The detection limits were 0.2 and 2.6 μg/L for Pb2+ and Cd2+, respectively. The high sensitivity, selectivity, and stability of this DVD-based Ag electrode enabled its practical application for simple, rapid and economical determination of trace levels of Cd2+ and Pb2+ in tap water samples. In addition, detection can be achieved without sample deoxygenation and the electrode can be easily manufactured.
      PubDate: 2017-09-13
      DOI: 10.1007/s40242-017-7010-4
       
  • Density Functional Theoretical Studies on Effect of Intramolecular
           Hydrogen Bonds on Reduction of Nitrophenols
    • Authors: Hongmei Zhang; Yan Liu; Fangping Ma; Wei Qiu; Bo Lei; Jinyou Shen; Xiuyun Sun; Weiqing Han; Jiansheng Li; Lianjun Wang
      Abstract: Abstract Intramolecular hydrogen bonds(IMHBs) can lead to different physicochemical characteristics of nitro-phenols(NPs) that determine their environmental behavior. In the present work, to reveal the relationship between IMHB and nitrophenol reduction, the effects of IMHB on the molecular geometries and properties of a series of ni-trophenols were investigated with density functional theory(DFT) calculations. The results of the geometry optimiza-tion and atoms-in-molecules(AIM) analysis indicate relatively strong IMHBs in ortho-substituted nitrophenols, whose stability could be significantly improved. In comparing the E LUMO and adiabatic electron affinities(AEA) of the nitrophenol isomers, the presence of IMHBs benefited the reductive degradation of NPs, consistent with a previous study. To gain an insight into the effect mechanism of IMHBs on the reductive degradation behavior of these mole-cules, the condensed electrophilicity Fukui index(f –), natural charges and Wiberg bond orders of these nitrophenol isomers were calculated. The calculations indicate that the electrophilic reactivity activity of the O atom on the nitro group could be significantly improved due to the formation of IMHBs, which results in the enhanced reductive degradation of ortho-substituted NPs.
      PubDate: 2017-09-13
      DOI: 10.1007/s40242-017-7066-1
       
  • Fluorine-free Ionic Liquid Based on Thiocyanate Anion with Propylene
           Carbonate as Electrolytes for Supercapacitors: Effects of Concentration
           and Temperature
    • Authors: Lifeng Zhang; Suqing Du; Qiaolan Song; Yi Liu; Shouwu Guo
      Abstract: Abstract High performance supercapacitors were constructed using ionic liquid 1-ethyl-3-methylimidazolium thi-ocyanate(EmimSCN)-based electrolyte with chemically reduced graphene oxide(CRGO) as electrodes. Propylene carbonate(PC) was selected as the solvent due to its stable physical and electrochemical properties. Then, in-depth study of the concentration and temperature effects on the electrochemical properties of the EmimSCN/PC electrolyte was carried out. Electrochemical measurements revealed that 2.0 mol/L EmimSCN/PC electrolyte delivered good electrochemical performance(131 F/g of the specific capacity after 3000 cycles at room temperature). Moreover, the assembled supercapacitors exhibited good capacitive behavior at an extending temperature(397 F/g of the specific capacity after 3000 cycles at 50 °C), demonstrating that the EmimSCN/PC electrolyte is a promising candidate for safe high-power supercapacitors.
      PubDate: 2017-09-13
      DOI: 10.1007/s40242-017-7100-3
       
  • High Selectivity to Diphenyl Carbonate Synthesized via Transesterification
           Between Dimethyl Carbonate and Phenol with C 60 -doped TiO 2
    • Authors: Yingmin Qu; Hao Yang; Songlin Wang; Tong Chen; Gongying Wang
      Abstract: Abstract An environmentally friendly heterogeneous catalyst, C60-doped TiO2(denoted as C60-TiO2), was prepared and firstly used to catalyze the synthesis of diphenyl carbonate(DPC) via the transesterification of phenol and dime-thyl carbonate(DMC). The characterization results of FTIR, XRD, XPS, SEM, TEM and digital optical micro-scope(MIC) show that C60 promotes the dispersion of TiO2 and the prepared conditions affect the dispersion and the electron density of Ti species. The C60-TiO2-8[n(Ti):n(C60)=8:1] prepared with toluene and calcined at 200 °C exhi-bits the best catalytic performance. The DPC selectivity of 86.5% attained over C60-TiO2-8 was much higher than that(about 50%) attained over Ti-based catalysts reported, which was originated from the electronic effect of C60 and the efficient dispersion of Ti species by C60. The phenol conversion slowly decreased from 34.4% to 26.7% after four consecutive runs due to the leach of Ti species. It also suggested that the C60 could relieve the leach of Ti species compared with other Ti-based catalysts reported. Moreover, C60-TiO2-8 exhibited excellent catalytic behavior for disproportionation of methyl phenyl carbonate(MPC) with high DPC selectivity.
      PubDate: 2017-09-13
      DOI: 10.1007/s40242-017-6500-8
       
  • Two new baccharane glycosides from seeds of Impatientis balsamina L. with
           In vitro growth inhibitory activity in human cancer A375 cells
    • Authors: Qian Wu; Yongri Jin; Hua Yao; Ying Liu; Peng Li; Xuwen Li
      Abstract: Abstract Two new baccharane-type glycosides (1 and 2), together with seven known baccharane-type glycosides (3―9) hosenkoside A, hosenkoside B, hosenkoside C, hosenkoside F, hosenkoside M, hosenkoside K and hosenko-side G were isolated from the dried seeds of Impatientis balsamina L. The new baccharane-type glycosides were identified as honsenkol A-3-O-β-D-glucopyranosyl-26-O-β-D-glucopyranosyl-28-O-β-D-glucopyranosyl-O-β-D-glucopyranosyl(1) and (3S,4R,17R,20S)-17-hydroxy-3-O-β-D-xylopyranose(12)-β-D-glucopyranosyl-26-O-β-D-glucopyranosyl-28-O-β-D-glucopyranosyl-21,24-epoxybaccharane(2), respectively, by spectroscopic methods, in-cluding NMR(1D and 2D), IR and HR-ESI-MS. Compounds 1 and 2 were evaluated for in vitro inhibitory activity against the cell lines. Compound 2 with a new baccharane skeleton had anti-hepatic fibrosis activity against A375 cells in bioassay results, which means the new compounds have potential value in antitumor applications.
      PubDate: 2017-09-12
      DOI: 10.1007/s40242-017-7061-6
       
  • Studies on the activities of electrophilic sites on benzene ring of
           4-substituted anilines and their acyl compounds with multiphilicity
           descriptor
    • Authors: Xizhou Shen; Huajun He; Bowen Yang; Zhigang Zhao; Kaiyuan Shao; Wenxiang Hu
      Abstract: Abstract In this paper, the activities of electrophilic sites on benzene ring of 4-substituted anilines and their acyl compounds were studied with the quantitative indicator of multiphilicity descriptor. Four substituents were synthe-sized with microwave irradiation in good yields to verify the quantitative analysis data. Friedel-Crafts acylation was carried out by the microwave method for the first time.
      PubDate: 2017-09-12
      DOI: 10.1007/s40242-017-7112-z
       
  • Phytochemical analysis of Ziziphus jujuba leaves in six cultivars at the
           whole life stage by high performance liquid chromatography
    • Authors: Xueqin Cui; Zhongxiao Ma; Lu Bai; Yong Wu; Sen Guo; Qingchao Liu; Li Zhang; Chi-Tang Ho; Naisheng Bai
      Abstract: Abstract Leaves of Ziziphus jujuba Mill.(Z. jujuba) were used as a folk medicine to treat children suffering from typhoid fever, furuncle and ecthyma in China. The present study was to establish a high performance liquid chroma-tography-diode array detector(HPLC-DAD) method for quality control of Z. jujuba leaves. The validated method was applied to the simultaneous characterization and quantification of sixteen main constituents in thirty samples, which comprised the whole life stage of Z. jujuba leaves from six cultivars in Yulin, Shannxi Province, China. HPLC fin-gerprint file of Z. jujuba leaves was set up and the results indicate that the major constituents of Z. jujuba leaves are (‒)-catechin(1), quercetin-3-O-robinobioside(3), rutin(4) and quercetin-3-O-α-L-arabinosyl-(1→2)-α-L-rhamnoside(6) with the total contents of the nine flavonoids in respective batch ranging from 18.52 mg/g to 39.51 mg/g. In addition, the contents of compounds depend on both the season and the cultivar. During ripening of Z. jujuba leaves, flavo- noids of all the cultivars present a similar trend: initially decrease from 25th, Jun. to 5th, Aug., 2015, and then in-crease for a period of time, finally slightly fluctuate on 5th Oct. The highest contents of total flavonoids were regis-tered on 25th Jun., 2015. Different cultivars have 50%―90% variation on the content for the three classes of com-pounds. Taken together, the results demonstrate that Z. jujuba leaves have great potential to be a new health-promoting resource based on flavonoids and the best sampling time of them is in June.
      PubDate: 2017-09-12
      DOI: 10.1007/s40242-017-7076-z
       
  • Development of a novel kilowatt microwave plasma torch source for atomic
           emission spectrometry
    • Authors: Dan Zhu; Wei Jin; Bingwen Yu; Yangwei Ying; Haixiang Yu; Jin Shan; Yuwei Yan; Chen Xu; Baolai Wang; Qinhan Jin
      Abstract: Abstract Traditional low power-microwave plasma torch(MPT) excitation source of atomic emission spectrometry was shown to be good for the introduction of dry aerosols, but poor for wet sample aerosols. In this work, some significant modifications have been made to traditional MPT. A new MPT excitation source working at kilowatt microwave power has been developed. The kilowatt MPT source can sustain stable plasmas with double or even more filaments, presenting a “bell” form, where the region around the converging point is the optimum region for analysis. The tolerance to aqueous aerosol of the torch is enhanced significantly compared to the traditional one. Therefore, the desolvation system that the low power MPT source has to be relied on can be gotten rid of. A set of favorable detection results have been obtained with direct wet sample aerosol introduction. The kilowatt MPT source is expected to become a practical excitation source for atomic emission spectrometry that will be widely used.
      PubDate: 2017-09-11
      DOI: 10.1007/s40242-017-7072-3
       
  • FeCl 3 6H 2 O-catalyzed synthesis of β -ketothioesters from chain α -oxo
           ketene dithioactals
    • Authors: Hui Zhao; Quanping Diao; Haifeng Yu; Tiechun Li; Peiqiu Liao; Dongyan Hou
      Abstract: Abstract A FeCl3 6H2O-catalyzed synthesis of β-ketothioesters from the hydrolysis reaction of chain α-oxoketene dithioacetals was carried out. Subsequently, we explored the FeCl3 6H2O-catalyzed Friedel-Crafts alkylation of the synthesized β-ketothioesters with alcohols in CH3CN at 25 °C, affording the desired α-alkylated β-ketothioesters in excellent yields. Wide scope of the substrates, use of inexpensive reagents, high yields under mild reaction conditions are notable features of these reactions.
      PubDate: 2017-09-11
      DOI: 10.1007/s40242-017-7082-1
       
  • Insights into the interactions between corrinoid iron-sulfur protein and
           methyl transferase from human pathogen Clostridium difficile
    • Authors: Yaozhu Wei; Xiangshi Tan
      Abstract: Abstract The human pathogen Clostridium difficile infection(CDI) is one of the most important healthcare-associated infections. Methyltransferase(MeTrCd) and corrinoid iron-sulfur protein(CoFeSPCd) are two key proteins in the acetyl-coenzyme A synthesis pathway of Clostridium difficile, which is essential for the survival of the pathogen and is absent in humans. Hence, the interaction between MeTrCd and CoFeSPCd can become innovative targets for the treatment of human CDI. In this study, the interaction between MeTrCd and CoFeSPCd was verified by fluorescence resonance energy transfer measurements. The influence of the interaction on the tertiary structure of MeTrCd and CoFeSPCd was studied by ANS-labeled fluorescence measurements. Molecular docking was also performed to understand the mechanism of the protein interactions. These results provide a molecular basis for innovative drug design and development to treat human CDI.
      PubDate: 2017-09-11
      DOI: 10.1007/s40242-017-7142-6
       
  • A new biphenylcarbonitrile based fluorescent sensor for Zn 2+ ions and
           application in living cells
    • Authors: Jia Feng; Xiuqing Shao; Zhuobin Shang; Jianbin Chao; Yu Wang; Weijun Jin
      Abstract: Abstract A new and efficient fluorescent sensor 4′-hydroxy-3′-[(4-antipyrineimino)methyl]-4-biphenylcarboni- trile(L) was prepared for the selective detection of Zn2+ in aqueous ethanol medium. When excited at 419 nm, the fluorescent intensity of sensor L at 507 nm was remarkably increased more than 54-fold after adding Zn2+ ions. The strong green emission of the solution can be easily identified by naked eye under UV light. Thus, sensor L behaves as a naked eye fluorescent “turn on” detector for Zn2+ ions. The fluorescence enhancement might be attributed to the in-hibition of excited state intramolecular proton transfer(ESIPT) and C=N isomerization as well as the chelation en-hanced fluorescence(CHEF) effect. The complex solution of sensor L with Zn2+ ions exhibited reversibility with ethylene diamine tetraacetic acid(EDTA) and the probe could be recycled for further use. Notably, sensor L could clearly distinguish Zn2+ from Cd2+. The interaction of sensor L with zinc ions was investigated by means of FTIR, 1H NMR and HRMS spectroscopy. Furthermore, sensor L has been applied for cell imaging studies.
      PubDate: 2017-09-11
      DOI: 10.1007/s40242-017-7084-z
       
  • An aptamer-based colorimetric sensor for streptomycin and its application
           in food inspection
    • Authors: Zhongcheng Liu; Yanfen Zhang; Yao Xie; Ying Sun; Kewei Bi; Zhe Cui; Lijian Zhao; Wufang Fan
      Abstract: Abstract An aptamer-based colorimetric biosensor was developed, which could be used to detect residual strepto-mycin from food quickly and cost-effectively. The ssDNA aptamer target for streptomycin was obtained using sys-temic evolution of ligands by exponential enrichment through affinity chromatography. A total of 19 candidates were obtained after 10 rounds of selection and were grouped into 3 families according to their similarity of sequence and structure. Among them, aptamer A15 showed the highest affinity for streptomycin tested by fluorescence intensity analysis with a dissociation constant of 6.07 nmol/L. Aptamer A15 also exhibited a higher streptomycin specificity with the lowest detectable limit of 25 nmol/L according to the value of A 620/A 520 ratio with AuNP-based colorimetric assay. The method was specific and sensitive for the detection of streptomycin from simply-treated milk and honey at 100 and 125 nmol/L, respectively, and is a promising approach to monitor antibiotics or other small molecules ana-logues in food inspection.
      PubDate: 2017-09-11
      DOI: 10.1007/s40242-017-7029-6
       
 
 
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