E-journal of Chemistry最新文献_第2页

Experiences during Synthesis of a Dinucleating Spacer Incorporating 2-Chloropyridine Units Through Sandmayer Reaction Sandmayer反应合成含2-氯吡啶双核间隔剂的经验

E-journal of Chemistry Pub Date : 2012-01-01 DOI: 10.1155/2012/646397

S. Shukla, P. Gaur, R. Mehrotra, R. Srivastava

引用次数: 0

Nano-Catalytic Ozonation of 4-Nitrochlorobenzene in Aqueous Solutions 水溶液中4-硝基氯苯的纳米催化臭氧化

E-journal of Chemistry Pub Date : 2012-01-01 DOI: 10.1155/2012/696418

S. Tabatabaei, A. Mehrizad, P. Gharbani

引用次数: 6

Spectroscopic and Electrochemical Studies on the Interaction of Epirubicin with Fish Sperm DNA 表柔比星与鱼精子DNA相互作用的光谱和电化学研究

E-journal of Chemistry Pub Date : 2012-01-01 DOI: 10.1155/2012/738678

R. Hajian, E. Ekhlasi, R. Daneshvar

{"title":"Spectroscopic and Electrochemical Studies on the Interaction of Epirubicin with Fish Sperm DNA","authors":"R. Hajian, E. Ekhlasi, R. Daneshvar","doi":"10.1155/2012/738678","DOIUrl":"https://doi.org/10.1155/2012/738678","url":null,"abstract":"The interactions between epirubicin (EPR) and double stranded DNA (ds-DNA) have been studied by UV-Vis spectrophotometry, cyclic voltammetry, fluorescence spectroscopy and viscometery. The apparent binding constant of epirubicin with DNA was found to be 3.8 × 105 mol-1 L and was studied at different temperatures. It indicated that the former method could be successfully applied to the determination of epirubicin. Also, the voltammetric behavior of EPR was investigated at glassy carbon electrode using cyclic voltammetry. Thermodynamic parameters including ∆H0, ∆G0 and ∆S0 were determined as -5.7×104, -3.13×104 J mol-1 and -87.96 J mol-1 K-1 respectively. One indication of the strong interaction between DNA and EP was increasing of viscosity. The diffusion coefficients of EP in the absence (D0)f and presence of ds-DNA (D0)b was calculated as 5.04×10-6 and 1.13×10-6 Cm2 s-1 respectively. According to the thermodynamic parameters, the main binding force could be judged. The experimental results revealed that EPR and ds-DNA had strong interactions. The mechanism of quenching belonged to static quenching and the main sort of binding force was intercalation.","PeriodicalId":11519,"journal":{"name":"E-journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2012/738678","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64348570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 28

Studies on Removal of Cr (VI) from Aqueous Solutions Using Powder of Mosambi Fruit Peelings (PMFP) As a Low Cost Sorbent 山楂果皮粉末(PMFP)作为低成本吸附剂去除水溶液中铬(VI)的研究

E-journal of Chemistry Pub Date : 2012-01-01 DOI: 10.1155/2012/769674

R. H. Krishna, A. Swamy

引用次数: 11

Synthesis of Substituted 3,4-Dialkyl-2,6-Diaryl- Piperidin-4-ol Derivatives and Their Conformational Study 取代3,4-二烷基-2,6-二芳基-胡椒碱-4-醇衍生物的合成及其构象研究

E-journal of Chemistry Pub Date : 2012-01-01 DOI: 10.1155/2012/783605

T. Maruthavanan, P. Venkatesan

引用次数: 0

Structural and Theoretical Studies of 2-amino-3-nitropyridine 2-氨基-3-硝基吡啶的结构与理论研究

E-journal of Chemistry Pub Date : 2012-01-01 DOI: 10.1155/2012/895240

A. Dahy, I. Kh, N. M. El-Salam, S. Arabia

{"title":"Structural and Theoretical Studies of 2-amino-3-nitropyridine","authors":"A. Dahy, I. Kh, N. M. El-Salam, S. Arabia","doi":"10.1155/2012/895240","DOIUrl":"https://doi.org/10.1155/2012/895240","url":null,"abstract":"Geometrical optimization, spectroscopic analysis, electronic structure and nuclear magnetic resonance of 2-amino-3-nitropyridine (ANP) were investigated by utilizing ab-initio (MP2) and DFT(B3LYP) using 6- 311++G(d,p) basis set. Geometrical parameters (bond lengths, bond angles and torsion angles) were computed and compared with the experimental values obtained using X-ray single crystal measurements of the title compound. IR spectra were obtained and assigned by vibrational analysis. Comparing the theoretically calculated values (bond lengths, bond and dihedral angles) using both B3LYP/6-311++G(d,p) and MP2/6-311++G(d,p) methods of calculations with the experimentally determined data by X-ray single crystal measurements, all the data obtained in this investigation were considered to be reliable. The theoretical infrared spectra have been successfully simulated by means of DFT and MP2 levels of calculations. The 1 H and 13 C nuclear magnetic resonance (NMR) chemical shifts of 2-amino-3-nitropyridine were calculated using the GIAO method in DMSO solution using IEF-PCM model and compared with the experimental data. Intramolecular hydrogen bonding interaction in this compound was investigated by means of the NBO analysis. The calculated HOMO and LUMO energies show that charge transfer occurs within the molecule.","PeriodicalId":11519,"journal":{"name":"E-journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2012/895240","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64365246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Design, Synthesis, Antibacterial and Antifungal Activity of Novel 2-((E)- 2-aryl-1-ethenyl)-3-(2- sulfanyl-1H-benzo(d)imidazole-5-yl)-3,4- dihydro-4- quinolinones 新型2-((E)- 2-芳基-1-乙烯基)-3-(2-磺胺基- 1h -苯并(d)咪唑-5-基)-3,4-二氢-4-喹啉酮的设计、合成及抑菌活性研究

E-journal of Chemistry Pub Date : 2012-01-01 DOI: 10.1155/2012/795698

Ravinder Nath ANISETTI, M. S. Reddy

引用次数: 2

Density Functional Theory (DFT) Study of O2, N2 Adsorptions on H-Capped (5, 0) Single–Walled Carbon Nanotube (CNT) h -帽(5,0)单壁碳纳米管(CNT)对O2、N2吸附的密度泛函理论(DFT)研究

E-journal of Chemistry Pub Date : 2012-01-01 DOI: 10.1155/2012/819490

F. Ashrafi, A. Ghasemi̇

{"title":"Density Functional Theory (DFT) Study of O2, N2 Adsorptions on H-Capped (5, 0) Single–Walled Carbon Nanotube (CNT)","authors":"F. Ashrafi, A. Ghasemi̇","doi":"10.1155/2012/819490","DOIUrl":"https://doi.org/10.1155/2012/819490","url":null,"abstract":"CNTs are one of the most significant achievements of nano-technology with important applications in the design of electronic nano-devices. Nano-tubes with small size, physical stability and sensitivity of their electric properties to adsorption of N2 and O2 make them ideal materials for use in gas sensors. In this investigation the (DFT) method is utilized to study the adsorption of oxygen, nitrogen molecules on the surface of (5,0) CNT. The electronic structure, NMR spectrum, dipole moment of nitrogen, oxygen and carbon nuclei's are thoroughly studied. The computational results indicate that rich adsorption patterns may result from the interaction of oxygen and nitrogen with the CNTs. Sometimes, C-O bounds are formed via breaking C-C bounds and sometimes a carbon atom in the nanotube is replaced with an oxygen atom. Sometimes oxygen and nitrogen molecular are attracted to a C-C bound. In summary, the optimized adsorption rates are calculated. The nitrogen molecules adsorb with a comparatively lower rate and almost never a chemical binding is formed with the CNT. Gaussian 98 software has been used to carry out quantum chemistry calculations.","PeriodicalId":11519,"journal":{"name":"E-journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2012/819490","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64356181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Microwave-Induced, Iodine-Alumina Catalyzed Transformations of 1-(2′-hydroxyaryl)-3-(2-chloroquinolin-3-yl)-prop-2-en-1-one 微波诱导，碘-氧化铝催化1-(2 ' -羟基)-3-(2-氯喹啉-3-基)-丙-2-烯-1- 1的转化

E-journal of Chemistry Pub Date : 2012-01-01 DOI: 10.1155/2012/354875

P. Venkatesan, K. Moorthi

引用次数: 3

Determination of Capsaicin and Dihydrocapsaicin in Some Chilli Varieties using Accelerated Solvent Extraction Associated with Solid-Phase Extraction Methods and RP-HPLC-Fluorescence 加速溶剂萃取-固相萃取-反相高效液相色谱-荧光法测定部分辣椒品种中的辣椒素和二氢辣椒素

E-journal of Chemistry Pub Date : 2012-01-01 DOI: 10.1155/2012/380574

S. Chanthai, S. Techawongstien

{"title":"Determination of Capsaicin and Dihydrocapsaicin in Some Chilli Varieties using Accelerated Solvent Extraction Associated with Solid-Phase Extraction Methods and RP-HPLC-Fluorescence","authors":"S. Chanthai, S. Techawongstien","doi":"10.1155/2012/380574","DOIUrl":"https://doi.org/10.1155/2012/380574","url":null,"abstract":"Reversed phase-HPLC with fluorescence detection of two major capsaicinoids was described. Isocratic elution using a ratio of methanol and de- ionized water (66:34, v/v) as mobile phase was used at a flow rate of 0.9 mL/min with well achieved separation within 6 min. Under optimum conditions, their analytical figures of merit for the HPLC method were validated. The linearity was in the range of 1.0-25.0 g/mL with multiple determination coefficients of higher than 0.995. The limit of detection was ranged of 0.008-0.01 g/mL. The repeatability and reproducibility of the retention time and peak area for these compounds were in good precision with their relative standard deviations (RSDs) lower than 1% and 5%, respectively. Both capsaicin and dihydrocapsaicin were extracted using an accelerated solvent extraction (ASE) of methanol as an extraction solvent for 5 min static time with 3 cycles. The methanolic extracts were subjected to clean up with C18 solid-phase extraction (SPE) with its recoveries ranking of 90.2-98.0%. The method recoveries of real samples were found to be 60.7-98.6%. The optimized extraction method were applied for the determination of the two capsaicinoids in ten vareities of hot chilli pepper samples. Total contents of capsaicinoids were found in the range of 2,307.0-9047.3 g/g DW with their corresponding Scoville heat unit (SHU) of 34,600-135,700. Additionally, the contents of capsaicinoids using external calibration method comparing with those of standard addition were not significantly different, indicating accuracy of the method. Mostly, the contents of capsaicin found in these real samples were rather higher than those of dihydrocapsaicin.","PeriodicalId":11519,"journal":{"name":"E-journal of Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/2012/380574","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"64317871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 29