JBCS

8:09, Thu Apr 27

Open Access/APCs

vol. 24, No. 4, 2013, p. 527-706

 

Refreshing Guidelines for Peer Reviewers

Science grows based on previous achievements and new ideas. Scientific literature is an invaluable treasury of information, amusement and historical and contemporary developments. Publication in science is critically dependent on the role of acute protagonists and the main roles are played by authors, reviewers, readers and editors. All these protagonists confer to the science development its unique characteristics of self-control and self-correction.
Nowadays we live a fast transition from a printed world towards a virtual world dominated by digital communication. However, we must sticky to our standards and it is always important to rethink about them and to deepen their scope.

(Read more at Editorial)


Cover Article
J. Braz. Chem. Soc. 2013, 24(4), 601-608

Energy Transfer Processes in Tb(III)-Dibenzoylmethanate Complexes with Phosphine Oxide Ligands

Francisco A. Silva Jr.; Helenise A. Nascimento; Dariston K. S. Pereira; Ercules E. S. Teotonio; Hermi F. Brito; Maria Cláudia F. C. Felinto; José Geraldo P. Espínola; Gilberto F. Sá; Wagner M. Faustino

How to cite this article

A novel Tb(III)-diketonate complex, [Tb(DBM)(NO3)2(HMPA)2], that exhibits abnormally high green luminescence intensity in the crystalline form has been characterized. This complex presents considerably higher triplet state energy than its analogues [Tb(DBM)2(NO3)(HMPA)2] and [Tb(DBM)3(HMPA)] complexes, promoting a more operative antenna effect. This new complex presents potential for photonic applications based on Light Conversion Molecular Devices (LCMD).

http://dx.doi.org/10.5935/0103-5053.20130073

Published online: March 27, 2013

Editorial J. Braz. Chem. Soc. 2013, 24(4), 527-528

Refreshing Guidelines for Peer Reviewers

Joaquim A. Nóbrega; Watson Loh

How to cite this article

 

http://dx.doi.org/10.5935/0103-5053.20130097


Communication J. Braz. Chem. Soc. 2013, 24(4), 529-533

An Azafluorenone Alkaloid and a Megastigmane from Unonopsis lindmanii (Annonaceae)

Nídia C. Yoshida; João M. de Siqueira; Ricardo P. Rodrigues; Rodolfo P. Correia; Walmir S. Garcez

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The occurrence of azafluorenone alkaloids is rare and restricted to the Annonaceae family. In this study, the isolation of the alkaloid 5,8-dimethoxy-7-hydroxy-1-methyl-4-azafluoren-9-one and the megastigman (–)-(5R*, 6S*)-megastigman-3-one-10,7-olide from aerial parts of Unonopsis lindmanii (Annonaceae) is described.

http://dx.doi.org/10.5935/0103-5053.20130090

Published online: April 12, 2013


Articles J. Braz. Chem. Soc. 2013, 24(4), 534-540

Potential Diagnostic Assay for Cystinuria by Capillary Electrophoresis Coupled to Mass Spectrometry

Camila G. Barbosa; Norberto S. Gonçalves; Etelvino J. H. Bechara; Nilson A. Assunção

How to cite this article

 

This method can determine the profile of amino acids in human urine, in which alterations characterize cystinuria, an inborn error of metabolism. The earlier this alteration is detected in a newborn, the lower the chances of further health damage.

http://dx.doi.org/10.5935/0103-5053.20130085

Published online: April 5, 2013

J. Braz. Chem. Soc. 2013, 24(4), 541-549

Development of a Multicommuted Flow Analysis Procedure for Photometric Determination of Total N-ureide in Soybean Tissues

Carla C. Crispino; Boaventura F. Reis

How to cite this article

 

A low cost flow analysis setup employing multicommutation process for photometric determination of alantoin in soybean was developed employing a LED based photometer. Profitable features such as low reagent consumption and low volume of waste generation were achieved.

http://dx.doi.org/10.5935/0103-5053.20130065

Published online: March 19, 2013

J. Braz. Chem. Soc. 2013, 24(4), 550-557

Heterogeneous Catalysis Afford Biodiesel of Babassu, Castor oil and Blends

Lee M. G. de Carvalho; Wiury C. de Abreu; Maria das Graças de O. e Silva; José Renato de O. Lima; José Eduardo de Oliveira; José Milton E. de Matos; Carla V. R. de Moura; Edmilson M. de Moura

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Compounds of strontium (SrO + SrCO3 + Sr(OH)2) can efficiently catalyze the transesterification reaction of babassu and castor oils as well as a mixture of these oils. This method can greatly contribute to the settling of the transesterification process since it is more industrially satisfactory.

http://dx.doi.org/10.5935/0103-5053.20130064

Published online: March 19, 2013


J. Braz. Chem. Soc. 2013, 24(4), 558-572

DDT and Derivatives May Target Insulin Pathway Proteins

Diana Montes-Grajales; Jesus Olivero-Verbel; Maria Cabarcas-Montalvo

How to cite this article

 

DDT (1,1,1-trichloro-2,2-bis(4-chlorophenyl)ethane) and its derivatives showed good AutoDock Vina affinity values with several proteins involved in the insulin signaling pathway, suggesting this pesticide may modulate biochemical mechanisms, eventually explaining the reported relationship between exposure to this chemical and diabetes prevalence.

http://dx.doi.org/10.5935/0103-5053.20130072

Published online: March 22, 2013


J. Braz. Chem. Soc. 2013, 24(4), 573-579

Chemical Interactions Study of Antiretroviral Drugs Efavirenz and Lamivudine Concerning the Development of Stable Fixed-Dose Combination Formulations for AIDS Treatment

Elionai C. de L. Gomes; Wagner N. Mussel; Jarbas M. Resende; Silvia L. Fialho; Jamile Barbosa; Maria I. Yoshida

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Thermo-óptical analysis (TOA) images at 100× magnification of (a) efavirenz, (b) lamivudine and (c) mixture. Three images in different temperatures were shown for each pure drug and six for the mixture.

http://dx.doi.org/10.5935/0103-5053.20130071

Published online: March 22, 2013

J. Braz. Chem. Soc. 2013, 24(4), 580-584

A Straightforward and Efficient Synthesis of 3-(Pyrimidinyl)propanoates from Levulinic Acid

Alex F. C. Flores; Juliana L. Malavolta; Alynne A. Souto; Rayane B. Goularte; Darlene C. Flores; Luciana A. Piovesan

How to cite this article

 

This work describes the synthesis of a novel 3-(pyrimidinyl)propanoate series from versatile precursors 7,7,7-trihalo-4-methoxy-6-oxo-4-heptenoates obtained from renewable levulinic acid. These new derivatives are promising candidates for the treatment of different nervous system diseases.

http://dx.doi.org/10.5935/0103-5053.20130070

Published online: March 22, 2013


J. Braz. Chem. Soc. 2013, 24(4), 585-594

Plastic Membrane, Carbon Paste and Multiwalled Carbon Nanotube Composite Coated Copper Wire Sensors for Determination of Oxeladin Citrate Using Batch and Flow Injection Techniques

Sayed I. M. Zayed; Yousry M. Issac

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The fabrication and performance characteristics of three novel potentiometric sensors for the determination of oxeladin citrate are described. The sensors are based on the oxeladin-phosphotungstate ion associate as the electroactive material and dibutyl phthalate as solvent mediator.

http://dx.doi.org/10.5935/0103-5053.20130069

Published online: March 22, 2013

J. Braz. Chem. Soc. 2013, 24(4), 595-600

Curing, Monomer Leaching and Water Sorption of TEGDMA/BisGMA Photopolymerized Copolymers

Leticia F. A. Pinto; Isabel C. Rigoli; Miguel G. Neumann; Carla C. S. Cavalheiro

How to cite this article

 

Monomer elution and water absorption from, or into, copolymers show the same dependence with the degree of conversion of the photopolymerization processes.

http://dx.doi.org/10.5935/0103-5053.20130068

Published online: March 22, 2013

J. Braz. Chem. Soc. 2013, 24(4), 601-608

Energy Transfer Processes in Tb(III)-Dibenzoylmethanate Complexes with Phosphine Oxide Ligands

Francisco A. Silva Jr.; Helenise A. Nascimento; Dariston K. S. Pereira; Ercules E. S. Teotonio; Hermi F. Brito; Maria Cláudia F. C. Felinto; José Geraldo P. Espínola; Gilberto F. Sá; Wagner M. Faustino

How to cite this article

 

A series of lanthanide compounds containing one to three dibenzoylmethanate (DBM) ligands were synthesized and studied by luminescence spectroscopy. The abnormally high luminescence intensity exhibited by the less substituted Tb3+-DBM compounds was investigated and rationalized in terms of intramolecular ligand-to-metal energy transfers.

http://dx.doi.org/10.5935/0103-5053.20130073

Published online: March 27, 2013


J. Braz. Chem. Soc. 2013, 24(4), 609-614

Clerodane Diterpenes from Bark of Croton urucurana Baillon

Moacir G. Pizzolatti; Adailton J. Bortoluzzi; Ines M. C. Brighente; Analice Zuchinalli; Francieli K. Carvalho; Ana C. S. Candido; Marize T. L. P. Peres

How to cite this article

 

The new clerodane diterpene methyl 3-oxo-12-epibarbascoate was isolated from the stem barks of Croton urucurana together with the known diterpene methyl 12-epibarbascoate. Their structures were identified by spectroscopic techniques and the structure of 3-oxo-12-epibarbascoate was confirmed by X-ray diffraction. Graphical abstract adapted from the site http://www.tropicos.org/Image/52765, Tropicos Missouri Botanical Garden, July 11, 2012. The license terms are found at http://creativecommons.org/licenses/by-nc-sa/3.0/deed.en.

http://dx.doi.org/10.5935/0103-5053.20130075

Published online: March 27, 2013


J. Braz. Chem. Soc. 2013, 24(4), 615-620

Electron and Photon Stimulated Ion Desorption from Poly(thiophene)

J. R. Santa Rita; B. G. A. L. Borges; B. Beck; Y. Garcia-Basabe; L. S. Roman; M. L. M. Rocco

How to cite this article

 

The response of poly(thiophene) to the impact of electron and photon beams at different energies was investigated. The mechanism of formation of the principal ionic species was elucidated by the ion desorption yield analysis. The effect of the thickness of the films on the desorption process was investigated by photodesorption analysis.

http://dx.doi.org/10.5935/0103-5053.20130076

Published online: March 27, 2013

J. Braz. Chem. Soc. 2013, 24(4), 621-630

An Enhanced Electrochemical Sensing Platform Integrated with Graphene Oxide and Iron Hydroxide Colloid for Sensitive Determination of Phloroglucinol

Junhua Li; Daizhi Kuang; Yonglan Feng; Mengqin Liu; Fuxing Zhang; Peihong Deng

How to cite this article

 

A novel electrochemical sensing platform for phloroglucinol was fabricated with graphene oxide and iron hydroxide colloid. Due to the high surface area and the excellent electrical conductivity of the nanohybrid, the prepared electrochemical sensor has preeminent electrocatalytic activity towards the oxidation of phloroglucinol.

http://dx.doi.org/10.5935/0103-5053.20130077

Published online: March 27, 2013

J. Braz. Chem. Soc. 2013, 24(4), 631-638

Development of a Fast Method for the Determination of the Insecticide Fipronil and its Metabolites in Environmental Waters by SPE and GC-ECD

Márcia H. S. Kurz; Samile Martel; Fábio F. Gonçalves; Osmar D. Prestes; Manoel L. Martins; Renato Zanella; Martha B. Adaime

How to cite this article

 

The use of pesticides in rice cultivation in flooded paddy fields generates great environmental impact and new methods for simultaneous determination of pesticides and metabolites are required.

http://dx.doi.org/10.5935/0103-5053.20130078

Published online: March 27, 2013


J. Braz. Chem. Soc. 2013, 24(4), 639-644

Application of Low Density Homogeneous Liquid-Liquid Extraction Combined with GC for TPH and PAH Determination in Semi-micro Solid Samples

Jalal Hassan; Mohadeseh Izadi; Soma Homayonnejad

How to cite this article

 

The proposed method avoids using chlorinated solvents and expensive apparatus that are commonly used in other extraction methods. This method is very simple and suitable for extraction of organic pollutants from sediment samples.

http://dx.doi.org/10.5935/0103-5053.20130080

Published online: April 3, 2013

J. Braz. Chem. Soc. 2013, 24(4), 645-650

Determination of Fuel Origin by Comprehensive 2D GC-FID and Parallel Factor Analysis

Luiz A. F. de Godoy; Marcio P. Pedroso; Leandro W. Hantao; Fabio Augusto; Ronei J. Poppi

How to cite this article

 

Comprehensive two-dimensional gas chromatography-flame ionization detection (GC×GC-FID) combined with multivariate analysis was used to differentiate Brazilian and Venezuelan gasoline samples.

http://dx.doi.org/10.5935/0103-5053.20130081

Published online: April 3, 2013

J. Braz. Chem. Soc. 2013, 24(4), 651-656

Electrochemical Behavior of Ruthenium-Hexacyanoferrate Modified Glassy Carbon Electrode and Catalytic Activity towards Ethanol Electrooxidation

Wendell M. Costa; William S. Cardoso; Edmar P. Marques; Cicero W. B. Bezerra; Antonio Ap. P. Ferreira; Chaojie Song; Jiujun Zhang; Aldaléa L. B. Marques

How to cite this article

 

Complex-plane plots for glassy carbon electrode modified with a ruthenium-based hexacyanoferrate film at pH 1.5 in the presence and absence of ethanol at different applied potentials vs. Ag|AgCl|KClsat. Inset figure: electrode in the absence of ethanol.

http://dx.doi.org/10.5935/0103-5053.20130082

Published online: April 3, 2013

J. Braz. Chem. Soc. 2013, 24(4), 657-662

A New and Simple Electrochemically Assisted Photocatalysis Sensor of Hydrazine using a Ti/TiO2 Electrode

Reza Ojani; Ebrahim Zarei

How to cite this article

 

The present work reports a new analytical method for determination of hydrazine based on photoelectrocatalytic oxidation of TiO2 film modified titanium foil electrode (Ti/TiO2). This process was performed using Ti/TiO2 photoelectrode fabricated with anodic oxidation of Ti foil electrode.

http://dx.doi.org/10.5935/0103-5053.20130083

Published online: April 3, 2013

J. Braz. Chem. Soc. 2013, 24(4), 663-668

Ficusonic Acid: a New Cytotoxic Triterpene Isolated from Maytenus royleanus (Wall. ex M. A. Lawson) Cufodontis

Ala Ud Din; Ghias Uddin; Nusrat Hussain; Mohammad Iqbal Choudary

How to cite this article

 

Isolation, characterization and cytotoxicity of a new triterpene (ficusonic acid) from the roots of Maytenus royleana plant.

http://dx.doi.org/10.5935/0103-5053.20130084

Published online: April 5, 2013


J. Braz. Chem. Soc. 2013, 24(4), 669-674

Optimization of Extraction and Determination of Chloramphenicol in Livestock Meat Samples using Aqueous Two-Phase System of n-propanol and Potassium Citrate Coupled with HPLC

Yanfang Li; Juan Han; Yun Wang; Jingjing Ma; Yongsheng Yan; Lihua Cao

How to cite this article

 

A short chain alcohol aqueous two-phase system (ATPS) coupled with high performance liquid chromatography (HPLC) was developed to extract and analyse chloramphenicol (CAM) in livestock meat samples.

http://dx.doi.org/10.5935/0103-5053.20130086

Published online: April 10, 2013

J. Braz. Chem. Soc. 2013, 24(4), 675-684

Novel 3-(Aminomethyl)naphthoquinone Mannich Base-Platinum(IV) Complexes: Synthesis, Characterization, Electrochemical and Cytotoxic Studies

Gustavo B. da Silva; Amanda P. Neves; Maria D. Vargas; Wagner A. Alves; José D. B. Marinho-Filho; Cláudia Pessoa; Manoel O. Moraes; Letícia V. Costa-Lotufo

How to cite this article

 

Hydrogen bond interaction between the naphthoquinone 2-hydroxyl group and an axially Pt4+-coordinated hydroxide ligand in novel 1b-3b has been proposed to favor the Pt4+/Pt2+ reduction, and thus 1b-3b show similar cytotoxicity to their Pt2+ counterparts.

http://dx.doi.org/10.5935/0103-5053.20130087

Published online: April 10, 2013


J. Braz. Chem. Soc. 2013, 24(4), 685-689

2"-Ethyl-furanoflavone Derivatives from the Stems of Cassia fistula and their Cytotoxicity

Xue-Mei Gao; Yan-Qiong Shen; Xiang-Zhong Huang; Li-Ying Yang; Li-Dan Shu; Qiu-Fen Hu; Gan-Peng Li

How to cite this article

 

Two new 2"-ethyl-furanoflavones and six known furanoflavones were isolated from the stems of Cassia fistula. All the compounds were evaluated for their cytotoxicity against five human tumor cell lines. One of the compounds showed potent cytotoxicity against SHSY5Y and MCF7 cells with IC50 values of 2.7 and 2.6 μmol L-1, respectively.

http://dx.doi.org/10.5935/0103-5053.20130091

Published online: April 17, 2013


Short Report J. Braz. Chem. Soc. 2013, 24(4), 690-694

Evaluation of As(III) and Sb(III) Adsorption to Paddy Soils from Irrigated Rice Fields in Bangladesh

Dominik Weiss; Roulin Khondoker

How to cite this article

 

The preliminary study suggested that Sb(III) adsorption on paddy soils was stronger than As(III), which could explain the low Sb concentrations found in well waters in Bangladesh. No strong evidence was found for competitive behaviour between Sb(III) and As(III).

http://dx.doi.org/10.5935/0103-5053.20130074

Published online: March 27, 2013

J. Braz. Chem. Soc. 2013, 24(4), 695-699

Electrochemical Behavior of Hydroquinone and Catechol at a Silsesquioxane-Modified Carbon Paste Electrode

Paulo S. da Silva; Bianca C. Gasparini; Hérica A. Magosso; Almir Spinelli

How to cite this article

 

The simultaneous detection of hydroquinone and catechol was attained using a simple, easy to prepare, silsesquioxane-modified carbon paste electrode associated to differential pulse voltammetry.

http://dx.doi.org/10.5935/0103-5053.20130079

Published online: April 3, 2013

J. Braz. Chem. Soc. 2013, 24(4), 700-706

Optimization Method for Sequential Determination of Cu and Fe in Airborne Particulate Matter Collected on Glass Fiber Filters by Slurry Sampling FAAS

Tarcísio S. de Almeida; Mirna O. Sant´Ana; Jersica M. Cruz; Luciano Tormen; Adilson J. Curtius; José do Patrocínio H. Alves; Carlos A. B. Garcia; Pericles A. Santos; Rennan G. O. Araujo

How to cite this article

 

A slurry sampling flame atomic absorption spectrometric (FAAS) method is proposed for the sequential determination of copper and iron in airborne particulate matter (APM) collected on glass fiber filters.

http://dx.doi.org/10.5935/0103-5053.20130088

Published online: April 10, 2013

Online version ISSN 1678-4790 Printed version ISSN 0103-5053
Journal of the Brazilian Chemical Society
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