The Transnational Practice of Chemistry: Key Competencies and Effects on Career and Scientific Productivity
Claudio J. A. Mota; Nilton Rosenbach Jr.How to cite this article
The image shows the calculated structure of the bicyclobutonium cation on the zeolite Y structure, highlighting the hydrogen bond interactions with the framework oxygen atoms.
Roger Fréty; Maria da Graça C. da Rocha; Soraia T. Brandão; Luiz A. M. Pontes; Jose F. Padilha; Luiz E. P. Borges; Wilma A. GonzalezHow to cite this article
Liquid products from hydrocracking of babassu oil with NiMo/alumina catalyst, as analyzed by gas chromatography, showed a highly selective transformation of fatty acid moieties present in the original oil to a mixture of saturated linear hydrocarbons. The presence of both even and uneven C number in the products implies that two reaction mechanisms occurred: deoxygenation without C-C bond breaking and decarboxylation/decarbonylation.
Jordana S. Bueno; Bruno J. G. Silva; Maria Eugênia C. QueirozHow to cite this article
Chromatogram of blank plasma sample spiked with fluoxetine (FLX) and norfluoxetine (NFLX), resulting in 500 ng mL-1, after protein precipitation step and liquid chromatography-fluorescence detection analysis.
Itânia P. Soares; Thais F. Rezende; Rita de Cássia. C. Pereira; Cláudio G. dos Santos; Isabel C. P. FortesHow to cite this article
A three-dimensional plot of the first three principal components from biodiesel data. It is possible to distinguish, in each model, three different groups of samples: cotton, castor and palm biodiesel.
Jiangli Zhang; Wei Lin Li; Li Qiang WuHow to cite this article
A one-pot three-component condensation of 3,4-methylenedioxyphenol, aromatic aldehydes and
1,3-dimethylbarbituric acid, efficiently promoted in the presence of Zr(HSO4)4 under solvent-free conditions, produced 10-aryl-6,8-dimethyl-6,10-dihydro-5-oxa-6,8-diazaanthra[2,3-d][1,3]dioxole-7,9-diones.
Gustavo S. Garbellini; Carolina V. Uliana; Hideko YamanakaHow to cite this article
The article presents the individual and equimolar mixture of DNA nucleotide detection using square wave voltammetry on boron doped diamond electrodes cathodically and anodically pre-treated.
Xiaojuan Chang; Zhengping YuHow to cite this article
The reaction of amines with FMOC-Cl. Etimicin uses precolumn derivatization (PCD) with 9-fluor-enylmethyl chloroformate (FMOCCl) by a reversed phase separation and subsequent fluorescence detection.
Vedavati M. Panditrao; Aniket P. Sarkate; Jaiprakash N. Sangshetti; Pravin S. Wakte; Devanand B. ShindeHow to cite this article
The reversed phase HPLC method was developed and validated for Pramipexole dihydrochloride in bulk drugs and in pharmaceutical dosage form in the presence of degradation products. The detection was carried out at a wavelength of 260 nm. The Pramipexole was subjected to stress conditions of hydrolysis, oxidation, photolysis and thermal degradation
Brahim Boualy; Larbi El Firdoussi; Mustapha Ait Ali; Abdellah KarimHow to cite this article
Various natural terpenes are converted to the corresponding allylic chlorides in good to excellent yield, using MoCl5 /NaOCl system under mild conditions.
Hudson C. Polonini; Marcone A. L. de Oliveira; Anderson O. Ferreira; Nádia R. B. Raposo; Lívia N. Grossi; Marcos A. F. BrandãoHow to cite this article
The dissolution of the oxcarbazepine was carried out utilizing a dissolutor and different parameters in 18 experiments which lead to the plotting of a surface response graph. This allowed establishing the best conditions for the test.
Paola Jara-Ulloa; Paulina Cañete-Rosales; Luis J. Núñez-Vergara; Juan A. SquellaHow to cite this article
4-NimMeBr was adsorbed on the MWCNT modified electrode thus permitting the implementation of an adsorptive stripping voltammetric (ASV) method.
Dafne B. Domínguez-Carmona; Fabiola Escalante-Erosa; Karlina García-Sosa; Grace Ruiz-Pinell; David Gutierrez-Yapu; Manuel J. Chan-Bacab; Rosa E. Moo-Puc; Nigel C. Veitch; Alberto Giménez-Turba; Luis M. Peña-RodríguezHow to cite this article
3-O-acetylceanothic acid, a new natural ceanothane triterpene together with the known metabolites ceanothic acid, ceanothenic acid, betulinic acid, discarine B and chrysophanein, were isolated from the root extract of C. greggii var. yucatanensis and evaluated for their antiprotozoan, cytotoxic and anti-proliferative activities.
Seham Y. HassanHow to cite this article
New series of anthracenylpyrazolines and anthracenylpyrimidines were synthesized from 3-(anthracen-9-yl)-1-aryl-prop-2-en-1-one derivatives and spectroscopically characterized. The compounds were evaluated for their antibacterial and antifungal activities.
Luciano Gomes; Douglas W. Miwa; Geoffroy R. P. Malpass; Artur J. MotheoHow to cite this article
Electrochemical filter-press-type reactor used for dye removal.
Jeancarlo P. dos Anjos; Maria das Graças Cardoso; Adelir A. Saczk; Haroldo S. Dórea; Wilder D. Santiago; Ana Maria R. Machado; Lidiany M. Zacaroni; David Lee NelsonHow to cite this article
Evolution of the phenolic content of the cachaça during aging in oak barrel, where the phenolic compounds were analised by HPLC and spectrophotometric analysis.
Ali A. Ensafi; B. Rezaei; Zohre Mirahmadi-Zare; H. Karimi-MalehHow to cite this article
A modified electrode (by incorporation of carbon nanotubes with p-aminophenol as a mediator) was used as voltammetric sensor for the determination of captopril. The modified electrode has high electrocatalytic activity for captopril oxidation at pH 6.0. The voltammetric sensor was successfully applied for the determination of captopril in drug and urine samples.
Saeid Farhadi; Reza Zareisahamieh; Masoumeh ZaidiHow to cite this article
H6GeMo10V2O40•16H2O nanoparticles, as a new heteropoly acid, have been prepared through hydrothermal method and have been used as an efficient heterogeneous catalyst for rapid and selective acetylation of alcohols and phenols with acetic anhydride under solvent-free conditions at room temperature.
Marivaldo J. C. Corrêa; Fátima M. Nunes; Heriberto R. Bitencourt; Fábio C. Borges; Giselle M. S. P. Guilhon; Mara S. P. Arruda; Andrey M. R. Marinho; Alberdan S. Santos; Cláudio N. Alves; Davi S. B. Brasil; Lourivaldo S. SantosHow to cite this article
The chalcones were incubated in culture medium to produce the corresponding dihydrochalcones. The bioreduction was regioselective, occurring only in the carbon-carbon double bond of the α, β-insaturated ketone system.
Denise Osiro; Roberto W. Assis Franco; Luiz Alberto ColnagoHow to cite this article
FTIR spectra of Xac cells cultivated with (red) and without CuSO4 (black). The strong peak (red) at 1650 cm-1 in related to the production of pyruvated exopolysaccharides, by the cells, to bind and reduces the copper toxicity.
Lisandra V. Rosas; Thiago André M. Veiga; João B. Fernandes; Paulo C. Vieira; M. Fátima das G. F. da SilvaHow to cite this article
The occurrence of prenylindole alkaloids in Raputia species provides a better understanding of the chemotaxonomic relationships between Raputia and Neoraputia genera.
Mônica C. R. Camargo; Paula R. Antoniolli; Eduardo VicenteHow to cite this article
Polycyclic aromatic hydrocarbons (PAHs) are organic contaminants, which occur in air, soil and food, from incomplete combustion or pyrolysis of organic matter. In edible oils, the presence of PAHs is mainly attributed to the smoke drying of the oil seeds, during oil production.
J. F. Rios; J. A. Calderón; R. P. NogueiraHow to cite this article
The copper surface immersed in near-neutral aerated tap water shows an increasing film thickness with time that hinders the diffusion of copper species across the oxide layer, which is larger in stagnating condition.
Clóvis F. Silva Filho; Elissandro S. Emídio; Haroldo S. DóreaHow to cite this article
Pyrimethanil, pirimicarb and buprofezin are pesticides used in a variety of cultures and this work showed which one can be determinated in surface waters from irrigated area. The samples were collected from the irrigated regions of Sergipe and Pernambuco States, Brazil, and were prepared by solid-phase microextraction (SPME).
Rômulo F. S. Canto; Andressa Bernardi; Ana Maria O. Battastini; Dennis Russowsky; Vera Lucia Eifler-LimaHow to cite this article
A series of dihydropyrimidin-2-ones/thiones synthesized by a new environmentally-friend method showed, for the first time, antiproliferative activity against human U118-MG and rat C6 glioma cell lines. Some compounds were more cytotoxic than monastrol.
Jones Limberger; Silvia Poersch; Adriano L. MonteiroHow to cite this article
The Heck reaction of trans-stilbene derivatives with aryl halides in order to obtain substituted triarylethenes is described. Findings concerning the influence of halide or olefin electro-donating and withdrawing groups on activity, regio- and stereoselectivity of the Heck reaction are also reported.
Online version ISSN 1678-4790 Printed version ISSN 0103-5053
Journal of the Brazilian Chemical Society
JBCS Editorial and Publishing Office
University of Campinas - UNICAMP
13083-970 Campinas-SP, Brazil