Central European Journal of Chemistry最新文献_第8页

Solvent extraction with organophosphorus extractants in environmental samples: determination of cadmium(II) in natural water 环境样品中有机磷萃取剂溶剂萃取:天然水中镉(II)的测定

Central European Journal of Chemistry Pub Date : 2014-03-01 DOI: 10.2478/s11532-013-0379-0

V. Mánuel, J. Pinto, Carolina Mendiguchía, C. Moreno

引用次数: 3

Spectroscopic route to monitoring individual surfactant ions and micelles in aqueous solution: A case study 光谱方法监测水溶液中单个表面活性剂离子和胶束:一个案例研究

Central European Journal of Chemistry Pub Date : 2014-03-01 DOI: 10.2478/s11532-013-0384-3

J. Geng, B. Johnson, A. Wheatley, Jack Luo

引用次数: 6

Determination of vitamin B6 (pyridoxine hydrochloride) based on a novel BZ oscillating reaction system catalyzed by a macrocyclic complex 基于大环配合物催化BZ振荡反应体系测定维生素B6(盐酸吡哆醇)

Central European Journal of Chemistry Pub Date : 2014-03-01 DOI: 10.2478/s11532-013-0383-4

Qing-hai Zeng, Lu-Sheng Chen, Xian-Shuang Song, G. Hu, Lin-Yun Hu

{"title":"Determination of vitamin B6 (pyridoxine hydrochloride) based on a novel BZ oscillating reaction system catalyzed by a macrocyclic complex","authors":"Qing-hai Zeng, Lu-Sheng Chen, Xian-Shuang Song, G. Hu, Lin-Yun Hu","doi":"10.2478/s11532-013-0383-4","DOIUrl":"https://doi.org/10.2478/s11532-013-0383-4","url":null,"abstract":"AbstractThis paper reports a new method for determination of VB6 (pyridoxine hydrochloride) by its perturbation effects on a novel Belousov-Zhabotinskii (BZ) oscillating system. This novel BZ system, in which malic acid serves as the substrate, contains an enzyme-like complex, macrocyclic complex {[CuL](ClO4)2}, as catalyst. The ligand L in the complex is 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene. Results show that the addition of pyridoxine hydrochloride can perturb the oscillation amplitude and period, and the change of the oscillation amplitude is linearly proportional to the concentration of pyridoxine hydrochloride in the range of 5×10−7−2.5×10−4 M. The obtained RSD with seven samples is 3.073%. An assay of pharmaceutical tablets of vitamin B6 was evaluated. Some foreign ions were studied with respect to their possible influence on the determination of pyridoxine hydrochloride. The factors which influence this reaction include the concentration of reactant, the temperature of the reaction, property of catalyst, etc. Furthermore, the possible reaction mechanism has been proposed using the Field-Körös-Noyes (FKN) model.","PeriodicalId":9888,"journal":{"name":"Central European Journal of Chemistry","volume":"26 1","pages":"325-331"},"PeriodicalIF":0.0,"publicationDate":"2014-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85055013","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: 8

Numerical study of the laminar flame propagation in ethane-air mixtures 乙烷-空气混合物中层流火焰传播的数值研究

Central European Journal of Chemistry Pub Date : 2014-03-01 DOI: 10.2478/s11532-013-0387-0

V. Giurcan, D. Razus, M. Mitu, D. Oancea

引用次数: 14

Thermodynamic investigation of the binary and ternary complexes involving 1-aminocyclopropane carboxylic acid with reference to plant hormone 含1-氨基环丙烷羧酸的二元和三元配合物与植物激素的热力学研究

Central European Journal of Chemistry Pub Date : 2014-03-01 DOI: 10.2478/s11532-013-0374-5

M. Shoukry, Safaa S. Hassan

{"title":"Thermodynamic investigation of the binary and ternary complexes involving 1-aminocyclopropane carboxylic acid with reference to plant hormone","authors":"M. Shoukry, Safaa S. Hassan","doi":"10.2478/s11532-013-0374-5","DOIUrl":"https://doi.org/10.2478/s11532-013-0374-5","url":null,"abstract":"AbstractComplex formation equilibria of 1-aminocyclopropane carboxylic acid (ACC) and 3,3-bis(1-methylimidazol-2-yl) propionic acid (BIMP) with metal ions Cu2+, Ni2+, Co2+, Zn2+, Mn2+ and Fe2+ were investigated. ACC forms 1:1 and 1:2 complexes in addition to the hydrolysed form of the 1:1 complex, except in the case of Mn2+ and Fe2+, where the hydrolysed complex is not formed. BIMP forms 1:1 and 1:2 complexes in addition to the hydrolsed form of the 1:1 complex in the case of Mn2+ and Cu2+, however the hydrolysed complex is not detected for Ni2+, Co2+, Zn2+ and Fe2+. The concentration distribution diagrams of the complexes were determined. The Fe2+-complex with BIMP is exothermic and the thermodynamic parameters were calculated. The effect of organic solvent on the acid dissociation constants of 1-aminocyclopropane carboxylic acid (ACC) and 3,3-bis(1-methylimidazol-2-yl) propionic acid (BIMP) and the formation constants of Fe2+ complexes were investigated. Fe2+ forms a mixed-ligand complex with ACC and BIMP with stoichiometric coefficients 1:1:1. The formation constant was determined. The ternary complex is enhanced by back donation from the negatively charged 1-aminocyclopropane carboxylate to the π-system of BIMP. From the concentration distribution diagram, the ternary complex prevails in the physiological pH range.\u0000","PeriodicalId":9888,"journal":{"name":"Central European Journal of Chemistry","volume":"1 1","pages":"318-324"},"PeriodicalIF":0.0,"publicationDate":"2014-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82325917","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: 5

The exploration of interaction studies of smaller size, mostly ignored yet intrinsically inestimable molecules towards BSA; An example of STD and DOSY NMR 探索小尺寸的相互作用研究，大多被忽视，但本质上不可估量的分子对BSA;STD和DOSY NMR的一个例子

Central European Journal of Chemistry Pub Date : 2014-03-01 DOI: 10.2478/s11532-013-0380-7

Sheraz A. K. Tanoli, Nazish U. Tanoli, Saman Usmani, Zaheer-ul-Haq, A. Ferreira

{"title":"The exploration of interaction studies of smaller size, mostly ignored yet intrinsically inestimable molecules towards BSA; An example of STD and DOSY NMR","authors":"Sheraz A. K. Tanoli, Nazish U. Tanoli, Saman Usmani, Zaheer-ul-Haq, A. Ferreira","doi":"10.2478/s11532-013-0380-7","DOIUrl":"https://doi.org/10.2478/s11532-013-0380-7","url":null,"abstract":"AbstractLarger size or novel structure molecules are always appreciated by all fields of experimental and computational science. Conversely, molecules with smaller size and simple structures are usually ignored with no explanation as to why. However, the vast majority of more diminutive molecules behave as a cornerstone in the synthesis of a bigger structural framework. Subsequently, we planned to uncover the interactions of small molecules towards macromolecules, and successfully presented the binding results of 2-aminopyridine and Isovanillin towards BSA through NMR techniques. STD epitope mapping and also the DOSY results provided evidence that Isovanillin remained closer to the binding cavity of protein. Titration experiments afforded 584 µM (0.584mM) and 487 µM (0.487 mM) dissociation constants for isovanillin and 2-aminopyridine respectively. Furthermore, changes in diffusion coefficient (with and without protein addition in DOSY spectra) were found to be 0.081 log (m2 s−1) and 0.096 log (m2 s−1) points for isovanillin and 2-aminopyridine respectively. Docking studies exhibit that these molecules can tie to site 1 (sub-area IIA) through the pi-pi interaction and hydrogen bonding with Trp213. Our results demonstrated that both compounds could be utilized as part of a transporter in the circulatory system and their extension-inspired compounds may be utilized in new drug design.\u0000","PeriodicalId":9888,"journal":{"name":"Central European Journal of Chemistry","volume":"38 1","pages":"332-340"},"PeriodicalIF":0.0,"publicationDate":"2014-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78047827","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: 15

Spectral properties and photophysical behaviour of water soluble cationic Mg(II) and Al(III) phthalocyanines 水溶性阳离子Mg(II)和Al(III)酞菁的光谱性质和光物理行为

Central European Journal of Chemistry Pub Date : 2014-03-01 DOI: 10.2478/s11532-013-0388-z

M. Idowu, Yasin Arslanoğlu, T. Nyokong

引用次数: 5

Supramolecular complexes of podand ligands with xenon 荚体配体与氙的超分子配合物

Central European Journal of Chemistry Pub Date : 2014-02-21 DOI: 10.2478/s11532-014-0525-3

B. Gierczyk, R. Pankiewicz

引用次数: 2

Development and validation of an intrinsic dissolution method for nimodipine polymorphs 尼莫地平多晶物内溶出度方法的建立与验证

Central European Journal of Chemistry Pub Date : 2014-02-21 DOI: 10.2478/s11532-014-0511-9

M. K. Riekes, G. Kuminek, G. S. Rauber, S. Cuffini, H. K. Stulzer

引用次数: 10

Surface tension study of cationic gemini surfactants binding to DNA 阳离子gemini表面活性剂与DNA结合的表面张力研究

Central European Journal of Chemistry Pub Date : 2014-02-21 DOI: 10.2478/s11532-014-0513-7

M. Pisarčik, F. Devínsky

引用次数: 14