发布求助
文献互助 智能选刊 最新文献

Ecletica Quimica最新文献

筛选
英文 中文
Synthesis of new disulfonamides from different substituted diamino pyridines 不同取代二氨基吡啶合成新的二磺酰胺
Ecletica Quimica Pub Date : 2018-01-29 DOI: 10.1590/S0100-46702009000300003
H. Behmadi, Seyed Mahdi Saadati, M. Roshani, M. Ghaemy
{"title":"Synthesis of new disulfonamides from different substituted diamino pyridines","authors":"H. Behmadi, Seyed Mahdi Saadati, M. Roshani, M. Ghaemy","doi":"10.1590/S0100-46702009000300003","DOIUrl":"https://doi.org/10.1590/S0100-46702009000300003","url":null,"abstract":"A series of novel disulfonamide derivatives were synthesized and characterized by FT-IR, 1H NMR and MS techniques. In order to prepare new disulfonamides, at first we synthesized new diamines containing a pyridine ring. Then, they have been reacted with sulfonyl chlorides to give corresponding disulfonamides.","PeriodicalId":35894,"journal":{"name":"Ecletica Quimica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1590/S0100-46702009000300003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45290366","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: 9
Potentiometric determination of Minoxidil in topical use pharmaceutical samples 外用药物样品中米诺地尔的电位测定
Ecletica Quimica Pub Date : 2018-01-24 DOI: 10.1590/S0100-46702009000200003
R. A. Sousa, É. Cavalheiro
{"title":"Potentiometric determination of Minoxidil in topical use pharmaceutical samples","authors":"R. A. Sousa, É. Cavalheiro","doi":"10.1590/S0100-46702009000200003","DOIUrl":"https://doi.org/10.1590/S0100-46702009000200003","url":null,"abstract":"A potentiometric titration method for the determination of minoxidil based on its re- dox reaction with K2Cr2O7 is described. The best results were observed using 1.00 x 10-3 mol L-1 K2Cr2O7 and 1.00 x 10-2 mol L-1 minoxidil solutions, and the minoxidil as titrant in 2.00 mol L-1 H2SO4 medium. The method was applied to commercial samples and compared with the results from a chromatographic procedure. Recoveries from 97.4 to 98.7 % were observed depending on the sample. Comparison with the chromatographic procedure reveled agreement within 90% confidence level.","PeriodicalId":35894,"journal":{"name":"Ecletica Quimica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1590/S0100-46702009000200003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45518114","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: 4
Flow-batch analyser for preparation of calibration standard mixtures in simultaneous multicomponent spectrometric analysis 用于同时多组分光谱分析中校准标准混合物制备的流动批式分析仪
Ecletica Quimica Pub Date : 2018-01-24 DOI: 10.1590/S0100-46702009000200005
V. Visani, Sara Regina Ribeiro Carneiro de Barros, Heronides Adonias Dantas Filho, L. F. Almeida, R. Lima, W. Fragoso, T. C. Saldanha, M. C. U. Araújo
{"title":"Flow-batch analyser for preparation of calibration standard mixtures in simultaneous multicomponent spectrometric analysis","authors":"V. Visani, Sara Regina Ribeiro Carneiro de Barros, Heronides Adonias Dantas Filho, L. F. Almeida, R. Lima, W. Fragoso, T. C. Saldanha, M. C. U. Araújo","doi":"10.1590/S0100-46702009000200005","DOIUrl":"https://doi.org/10.1590/S0100-46702009000200005","url":null,"abstract":"The application of multivariate calibration techniques to multicomponent analysis by UV-VIS molecular absorption spectrometry is a powerful tool for simul- taneous determination of several chemical species. However, when this methodol- ogy is accomplished manually, it is slow and laborious, consumes high amounts of reagents and samples, is susceptible to contaminations and presents a high opera- tional cost. To overcome these drawbacks, a flow-batch analyser is proposed in this work. This analyser was developed for automatic preparation of standard calibration and test (or validation) mixtures. It was applied to the simultaneous determination of Cu 2+ , Mn 2+ and Zn 2+ in polyvitaminic and polymineral pharmaceutical formula- tions, using 4-(2-piridilazo) resorcinol as reagent and a UV-VIS spectrophotometer with a photodiode array detector. The results obtained with the proposed system are in good agreement with those obtained by flame atomic absorption spectrometry, which was employed as reference method. With the proposed analyser, the prepara- tion of calibration and test mixtures can be accomplished about four hours, while the manual procedure requires at least two days. Moreover, it consumes smaller amounts of reagents and samples than the manual procedure. After the preparation of calibration and test mixtures, 60 samples h -1 can be carried out with the proposed flow-batch analyser.","PeriodicalId":35894,"journal":{"name":"Ecletica Quimica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45394713","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: 3
Spectrophotometric flow injection system for determination of Zn2+ in ophthalmic formulations using Alizarin red S 流动注射分光光度法测定茜素红S眼科制剂中Zn2+
Ecletica Quimica Pub Date : 2018-01-24 DOI: 10.1590/S0100-46702009000200008
O. Fatibello‐Filho, H. Vieira
{"title":"Spectrophotometric flow injection system for determination of Zn2+ in ophthalmic formulations using Alizarin red S","authors":"O. Fatibello‐Filho, H. Vieira","doi":"10.1590/S0100-46702009000200008","DOIUrl":"https://doi.org/10.1590/S0100-46702009000200008","url":null,"abstract":"A spectrophotometric flow injection method for the determination of Zn(II) in ophthalmic formulations was developed. In this work, Zn(II) ion was complexed with Alizarin red S in borate buffer solution (pH 9.0) and the chromophore produced was monitored at 520 nm. The analytical curve was linear in the Zn(II) concentration range from 6.05 x 10-6 to 1.50 x 10-4 mol L-1 with a detection limit of 3.60 x 10-6 mol L-1. Recoveries ranged from 96.3 to 105 % and a relative standard deviation of 1.2 % (n = 10) for 5.5x10-5 mol L-1 Zn(II) reference solution were obtained. The sampling rate was 60 h-1 and the results obtained of Zn(II) in ophthalmic products using this procedure are in close agreement with those obtained using a comparative spectrophotometric procedure at 95 % confidence level.","PeriodicalId":35894,"journal":{"name":"Ecletica Quimica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1590/S0100-46702009000200008","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45817810","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: 1
Flow injection visible diffuse reflectance quantitative analysis of total sulfur in biodiesel, in plant leaves and in natural waters 流动注射可见漫反射定量分析生物柴油、植物叶片和自然水体中总硫
Ecletica Quimica Pub Date : 2018-01-24 DOI: 10.1590/S0100-46702009000200004
M. Tubino, C. Queiroz
{"title":"Flow injection visible diffuse reflectance quantitative analysis of total sulfur in biodiesel, in plant leaves and in natural waters","authors":"M. Tubino, C. Queiroz","doi":"10.1590/S0100-46702009000200004","DOIUrl":"https://doi.org/10.1590/S0100-46702009000200004","url":null,"abstract":"Flow injection (FI) methodology, using diffuse reflectance in the visible region of the spectrum, for the analysis of total sulfur in the form of sulfate, precipitated in the form of barium sulfate, is presented. The method was applied to biodiesel, to plant leaves and to natural waters analysis. The analytical signal (S) correlates linearly with sulfate concentration (C) between 20 and 120 ppm, through the equation S= 1 .138+0.0934 C (r = 0.9993). The expe- rimentally observed limit of detection is about 10 ppm. The mean R.S.D. is about 3.0 %. Real samples containing sulfate were analyzed and the results obtained by the FI and by the referen- ce batch turbidimetric method using the statistical Student's t-test and F-test were compared.","PeriodicalId":35894,"journal":{"name":"Ecletica Quimica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47590828","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
Caracterização de cálculos renais por análise térmica 热分析肾结石的特征
Ecletica Quimica Pub Date : 2018-01-23 DOI: 10.1590/S0100-46702009000100008
C. Branco, A. L. Silva, J. Luiz, L. P. Mercuri, J. R. Matos
{"title":"Caracterização de cálculos renais por análise térmica","authors":"C. Branco, A. L. Silva, J. Luiz, L. P. Mercuri, J. R. Matos","doi":"10.1590/S0100-46702009000100008","DOIUrl":"https://doi.org/10.1590/S0100-46702009000100008","url":null,"abstract":"Ten samples of kidney stone had been studied through elemental analysis of CHN (EA), Infrared Absorption Spectroscopy and X-Ray Powder Diffraction (XRD). The thermal behavior of the samples is studied by Thermogravimetry/Derivative Thermogravimetry (TG/DTG) and Differential Scanning Calorimetry (DSC). The results of AE, IV absorption Spectroscopy and XRD showed the presence of struvite (NH4Mg [PO4].6H2O), apatite, monohydrated calcium oxalate and dihydrated calcium oxalate. The TG and DSC curves allowed to classify the samples in two different groups: Group I show typical thermal behavior of struvite and Group II present a profile thermal analytical characteristic of a mixture of calcium oxalate.","PeriodicalId":35894,"journal":{"name":"Ecletica Quimica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44260400","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: 0
Synthesis and magnetic studies of copper(II)-lanthanide(III) 5-bromosalicylideneglycylglycine 铜(II)-镧系元素(III) 5-溴水杨酸基甘氨酸的合成与磁性研究
Ecletica Quimica Pub Date : 2018-01-23 DOI: 10.1590/S0100-46702009000100004
B. Cristóvão, W. Ferenc, J. Sarzyński, H. Głuchowska
{"title":"Synthesis and magnetic studies of copper(II)-lanthanide(III) 5-bromosalicylideneglycylglycine","authors":"B. Cristóvão, W. Ferenc, J. Sarzyński, H. Głuchowska","doi":"10.1590/S0100-46702009000100004","DOIUrl":"https://doi.org/10.1590/S0100-46702009000100004","url":null,"abstract":"The physico-chemical properties of the new 3d-4f heteronuclear complexes with general formula LnCu3(C11H8N2 O4Br)3·13H2O (where Ln = Pr, Eu, Gd, Tb, Er, Yb  and H3(C11H8N2 O4Br) - 5-bromosalicylideneglycylglycine) were studied. The compounds were characterized by elemental, spectral and thermal analyses and magnetic measurements. The formation of Schiff base is evidenced by a strong band at ca. 1646-1650 cm-1 attributable to C=N stretching mode. The presence of water molecules is confirmed by broad absorptions with maximum at 3360 - 3368 cm-1. The Cu(II)-Ln(III) complexes are stable up to ca. 318 K. During dehydration process the water molecules are lost probably in two stages. The magnetic susceptibility data for these complexes change with temperature according to the Curie-Weiss law.","PeriodicalId":35894,"journal":{"name":"Ecletica Quimica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1590/S0100-46702009000100004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42731567","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: 0
Thermal and spectral properties of di-and trimethoxybenzoates of silver (I) 二和三甲氧基苯甲酸银的热性质和光谱性质（I）
Ecletica Quimica Pub Date : 2018-01-23 DOI: 10.1590/S0100-46702009000100010
A. Dziewulska-KuBaczkowska, W. Ferenc
{"title":"Thermal and spectral properties of di-and trimethoxybenzoates of silver (I)","authors":"A. Dziewulska-KuBaczkowska, W. Ferenc","doi":"10.1590/S0100-46702009000100010","DOIUrl":"https://doi.org/10.1590/S0100-46702009000100010","url":null,"abstract":"The complexes of silver(I) with 2,3-, 2,4-, 2,6-, 3,4-, 3,5-dimethoxy-, and 2,3,4- and 3,4,5-trimethoxybenzoic acid anions have been synthesized and characterized by elemental analysis, IR spectroscopy, thermogravimetric and X-ray studies. Their solubility in water has been also determined at 293K. All analysed complexes were found to be crystalline, anhydrous compounds with low symmetry. The carboxylate groups act as bidentate or monodentate ligands. The thermal stability of compounds has been examined in air in temperature range of 293-1173K. The analysed complexes were found to be stable at room temperature and their solubilities in water at 293K to be in the order of 10-4 mol.dm-3.","PeriodicalId":35894,"journal":{"name":"Ecletica Quimica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42061256","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: 0
Aplicação de material zeolítico sintetizado de cinzas de carvão como adsorvente de poluentes em água 粉煤灰合成沸石材料作为水中污染物吸附剂的应用
Ecletica Quimica Pub Date : 2018-01-23 DOI: 10.1590/S0100-46702009000100007
D. A. Fungaro, J. C. Izidoro, M. Bruno
{"title":"Aplicação de material zeolítico sintetizado de cinzas de carvão como adsorvente de poluentes em água","authors":"D. A. Fungaro, J. C. Izidoro, M. Bruno","doi":"10.1590/S0100-46702009000100007","DOIUrl":"https://doi.org/10.1590/S0100-46702009000100007","url":null,"abstract":"Coal fly ashes treated by hydrothermal method were used as low-cost adsorbent for the removal of metals ions and dye from aqueous solution. The adsorption isotherms of the treated fly ashes were studied and results were fitted using Langmuir and Freundlich models. It shows that the Freundlich isotherm is better in describing the adsorption process for methylene blue. The equilibrium data for zinc and cadmium ions adsorption well fitted to the Langmuir equation. The maximum adsorption capacity value obtained was 0.78 (mg g-1)(L mg)1/n for methylene blue, 38.05 mg g-1 for Zn2+ and 67.48 mg g-1 for Cd2+. The synthesized materials exhibit much higher adsorption capacities than raw fly ashes. The study showed that the zeolitic material can effectively adsorb methylene blue and metals ions with removal efficiencies ranging from 82-99%.","PeriodicalId":35894,"journal":{"name":"Ecletica Quimica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49174717","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: 16
Potentiometric quantification and speciation of oxygenated groups in humic substances using BEST7 software 利用BEST7软件对腐殖物质中含氧基团的电位定量和物种形成
Ecletica Quimica Pub Date : 2018-01-22 DOI: 10.1590/S0100-46702010000400019
D. Vaz, A. Fernandes, B. Szpoganicz, M. M. D. Sierra
{"title":"Potentiometric quantification and speciation of oxygenated groups in humic substances using BEST7 software","authors":"D. Vaz, A. Fernandes, B. Szpoganicz, M. M. D. Sierra","doi":"10.1590/S0100-46702010000400019","DOIUrl":"https://doi.org/10.1590/S0100-46702010000400019","url":null,"abstract":"In this study the BEST7 software was employed to quantify different classes of functional groups and to model the proton titration behavior of humic substances. To illustrate the process, the Suwannee River fulvic acid of the IHSS (International Humic Substances Society) was used. Five categories - two classes of phenolic groups (phenol and cathecol), two classes of carboxylic groups (benzoic and phtalic) and the combination between them (salicylic) - of oxygenated groups were considered as being responsible for the potentiometric behavior of the sample and were quantitatively determined. The most and the least abundant groups were cathecol (3.300 ± 0.010 mmol g-1) and phenol (1.225 ± 0.070 mmol g-1), respectively. The estimated equilibrium constants were also determined and were in good agreement with the literature values for phenol and cathecol groups and for benzoic, phtalic and salicylic acids. Distribution diagrams of the species were generated with the software SPE and SPEPLOT.","PeriodicalId":35894,"journal":{"name":"Ecletica Quimica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41635654","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信