JBCS

1:53, Wed Nov 22

Open Access/APCs

vol. 27, No. 12, 2016, p. 2161-2391

 

Whether heterogeneously catalyzed transesterification of triacylglycerols in bio-oils to produce fatty acid methyl (or ethyl) esters (biodiesel) will come to be adopted on an industrial scale is essentially a matter of developing more efficient, low‑cost, recyclable catalysts. The article A mesoporous SiO2/γ-Fe2O3/KI heterogeneous magnetic catalyst for the green synthesis of biodiesel reports an effective step in this endeavor. Details are presented in the Article A Mesoporous SiO2/γ-Fe2O3/KI Heterogeneous Magnetic Catalyst for the Green Synthesis of Biodiesel by Alice L. Macedo, José D. Fabris, Manoel J. M. Pires, Wanessa L. Oliveira, José D. Ardisson, Rodinei Augusti, Fermin H. Aragón, Ricardo S. Santos, Luiz C. A. Oliveira and Márcio C. Pereira on page 2290.


Cover Article
J. Braz. Chem. Soc. 2016, 27(12), 2290-2299

A Mesoporous SiO2/γ-Fe2O3/KI Heterogeneous Magnetic Catalyst for the Green Synthesis of Biodiesel

Alice L. Macedo; José D. Fabris; Manoel J. M. Pires; Wanessa L. Oliveira; José D. Ardisson; Rodinei Augusti; Fermin H. Aragón; Ricardo S. Santos; Luiz C. A. Oliveira; Márcio C. Pereira

How to cite this article

Whether heterogeneously catalyzed transesterification of triacylglycerols in bio-oils to produce fatty acid methyl (or ethyl) esters (biodiesel) will come to be adopted on an industrial scale is essentially a matter of developing more efficient, low‑cost, recyclable catalysts. The article A mesoporous SiO2/γ-Fe2O3/KI heterogeneous magnetic catalyst for the green synthesis of biodiesel reports an effective step in this endeavor. Details are presented in the Article A Mesoporous SiO2/γ-Fe2O3/KI Heterogeneous Magnetic Catalyst for the Green Synthesis of Biodiesel by Alice L. Macedo, José D. Fabris, Manoel J. M. Pires, Wanessa L. Oliveira, José D. Ardisson, Rodinei Augusti, Fermin H. Aragón, Ricardo S. Santos, Luiz C. A. Oliveira and Márcio C. Pereira on page 2290.

http://dx.doi.org/10.5935/0103-5053.20160124

Published online: April 26, 2016

Articles J. Braz. Chem. Soc. 2016, 27(12), 2161-2169

Synthesis, Antitubercular and Leishmanicidal Evaluation of Resveratrol Analogues

Elaine S. Coimbra; Juliana A. Santos; Larissa L. Lima; Patrícia A. Machado; Débora L. Campos; Fernando R. Pavan; Adilson D. Silva

How to cite this article

 

Development of resveratrol analogs led to most effective compounds against Leishmania sp. and Mycobacterium tuberculosis and less toxic in mammalian cells.

http://dx.doi.org/10.5935/0103-5053.20160107

Published online: April 7, 2016


J. Braz. Chem. Soc. 2016, 27(12), 2170-2180

New Epimeric Spirostanol and Furostanol-Type Steroidal Saponins from Cestrum laevigatum L.

Paulo R. V. Ribeiro; Raimundo Braz-Filho; Ana J. Araújo; Letícia V. Costa-Lotufo; Luciana G. S. Souza; Hélio V. Nobre Junior; Cecília R. da Silva; João B. de Andrade Neto; Edilberto R. Silveira; Mary Anne S. Lima

How to cite this article

 

Four new epimericsteroidal saponins have been isolated from Cestrum Laevigatum L. Compounds containing spirostane skeleton exhibited antimicrobial activity against Candida albicans, C.krusei and C. parapsilosis and cytotoxic activity against HCT-116, OVCAR-8, HL-60 and SF-295 cancer cell lines, and the furostanols were inactive.

http://dx.doi.org/10.5935/0103-5053.20160109

Published online: April 8, 2016


J. Braz. Chem. Soc. 2016, 27(12), 2181-2191

Poly(dimethylsiloxane) and Poly[vinyltrimethoxysilane-co-2-(dimethylamino) ethyl methacrylate] Based Cross-Linked Organic-Inorganic Hybrid Adsorbent for Copper(II) Removal from Aqueous Solutions

Fábio A. B. Silva; Fátima A. Chagas-Silva; Fábio H. Florenzano; Fábio L. Pissetti

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A hybrid adsorbent was successfully prepared. CuII ions were effectively removed from aqueous solutions. All adsorption experimental data were evaluated using kinetic and isotherm models. This material could be used as a reusable adsorbent.

http://dx.doi.org/10.5935/0103-5053.20160110

Published online: April 8, 2016


J. Braz. Chem. Soc. 2016, 27(12), 2192-2202

Emissions of Criteria and Non-Criteria Pollutants by a Flex-Fuel Motorcycle

Luiz C. Daemme; Renato Penteado; Sergio M. Corrêa; Fátima Zotin; Marcelo R. Errera

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Aldehyde emissions directly increase with the ethanol content in the fuel blend, mainly during the cold phase of the engine.

http://dx.doi.org/10.5935/0103-5053.20160111

Published online: April 12, 2016

J. Braz. Chem. Soc. 2016, 27(12), 2203-2209

Bioactive Indole Alkaloids from Croton echioides

Claudio R. Novello; Luís C. Marques; Murilo E. Pires; Ana P. Kutschenco; Celso V. Nakamura; Samara Nocchi; Maria H. Sarragiotto; João C. P. Mello

How to cite this article

 

Bioguided fractionation of an extract of Croton echioides led to the isolation of several indole alkaloids as well as other bioactive compounds.

http://dx.doi.org/10.5935/0103-5053.20160112

Published online: April 13, 2016


J. Braz. Chem. Soc. 2016, 27(12), 2210-2215

The Effect of Atmosphere on Elemental Mercury Release During Thermal Treatment of Two Bituminous Coals

Libing Gao; Shaoqing Guo; Xian-Xian Wei; Yanzhi Cao

How to cite this article

 

The dynamic release behavior of Hg0 during thermal treatment of bituminous coal under N2, CO2 and air atmospheres from room temperature to 1200 ºC.

http://dx.doi.org/10.5935/0103-5053.20160113

Published online: April 15, 2016

J. Braz. Chem. Soc. 2016, 27(12), 2216-2225

Voltammetric Determination of Sulfonamides with a Modified Glassy Carbon Electrode Using Carboxyl Multiwalled Carbon Nanotubes

Bao-shan He; Wen-bo Chen

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This paper describes electrochemical properties of sulfonamides (SAs) based on glassy carbon electrode (GCE) modified with carboxyl multiwalled carbon nanotubes (MWCNTs) dispersing in N,N-dimethylfomamide (DMF) media. The DMF/carboxyl/MWCNTs/GCE exhibited excellent electrocatalytic activities, and it was successfully applied to the determination of SAs and real samples.

http://dx.doi.org/10.5935/0103-5053.20160114

Published online: April 15, 2016

J. Braz. Chem. Soc. 2016, 27(12), 2226-2233

The Influence of Organic Medium and Supports in the Resolution of (R,S)-Menthol Catalyzed by Lipases

Julyetty Crystyne da Silva; Maria da Graça Nascimento

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Herein, both the effect of organic medium and supports were evaluated in the resolution of (R,S)-menthol catalyzed by lipases.

http://dx.doi.org/10.5935/0103-5053.20160115

Published online: April 15, 2016

J. Braz. Chem. Soc. 2016, 27(12), 2234-2245

Assessment of Trace Elements in Tissues of Fish Species: Multivariate Study and Safety Evaluation

Edevaldo Silva; Fernanda N. Costa; Thais L. Souza; Zenira C. V. Viana; Anderson S. Souza; Maria G. A. Korn; Sergio L. C. Ferreira

How to cite this article

 

Levels of eleven elements in six different tissues of six fish species of the Todos os Santos Bay (Bahia State, Brazil) were determined by inductively coupled plasma mass spectrometry (ICP-MS) and the results were analyzed by multivariate techniques (principal component analysis (PCA) and hierarchical cluster analysis (HCA)).

http://dx.doi.org/10.5935/0103-5053.20160116

Published online: April 15, 2016

J. Braz. Chem. Soc. 2016, 27(12), 2246-2255

Grinding and Milling: Two Efficient Methodologies in the Solvent-Free Phosphomolybdic Acid-Catalyzed and Mechanochemical Synthesis of cis-4-Amido-N-yl-2-methyl-tetrahydroquinolines

Vladimir V. Kouznetsov; Diego R. Merchán-Arenas; Carlos A. Martínez-Bonilla; Mario A. Macías; Pascal Roussel; Gilles H. Gauthier

How to cite this article

 

Mechanochemical synthesis of cis-2,4-disubstituted tetrahydroquinolines (THQs) using a high speed vibratory ball mill (HSVBM) and phosphomolybdic acid (PMA) as heteropolyacid (HPA) catalyst.

http://dx.doi.org/10.5935/0103-5053.20160117

Published online: April 15, 2016


J. Braz. Chem. Soc. 2016, 27(12), 2256-2263

Photocatalytic Degradation for Treating Multipesticide Residues Using [Ru(bipy)3] Cl2-Doped TiO2/SiO2 Based on Surface Response Methodology

Bruno de S. Guimarães; Arthur A. Bernardes; Gabriela M. Salcedo; Sergiane S. Caldas; Marianna B. Jorge; Adalto Bianchini; Silvana I. Wolke; Ednei G. Primel

How to cite this article

 

[Ru(bipy)3]2+ doped TiO2-SiO2 was used as a new catalyst for degrading synthetic wastewater containing six classes of pesticides.

http://dx.doi.org/10.5935/0103-5053.20160118

Published online: April 15, 2016

J. Braz. Chem. Soc. 2016, 27(12), 2264-2272

Treatment of Sanitary Landfill Leachate by Photo-Fenton Process: Effect of the Matrix Composition

Jader O. Silva; Valdislaine M. Silva; Vicelma L. Cardoso; Antonio E. H. Machado; Alam G. Trovó

How to cite this article

 

The composition of the matrix-high turbidity and color, as well as presence of inorganic ions sulfate and chloride-influenced strongly the reaction time and consumption of H2O2, being recommended the implementation of a pre-treatment prior the photo-Fenton process.

http://dx.doi.org/10.5935/0103-5053.20160120

Published online: April 19, 2016

J. Braz. Chem. Soc. 2016, 27(12), 2273-2289

Evaluation of Major and Trace Elements in Medicinal Plants

Paulo S. C. Silva; Lucilaine S. Francisconi; Rodolfo D. M. R. Gonçalves

How to cite this article

 

Mean concentration, in mg kg-1, according to the part of the plant, A (bark), B (bean), C (bulb), D (flower), E (fruit), F (inflorescence), G (leaves), H (rizome), I (roots), J (seeds), K (shots), and L (whole plant).

http://dx.doi.org/10.5935/0103-5053.20160123

Published online: April 26, 2016

J. Braz. Chem. Soc. 2016, 27(12), 2290-2299

A Mesoporous SiO2/γ-Fe2O3/KI Heterogeneous Magnetic Catalyst for the Green Synthesis of Biodiesel

Alice L. Macedo; José D. Fabris; Manoel J. M. Pires; Wanessa L. Oliveira; José D. Ardisson; Rodinei Augusti; Fermin H. Aragón; Ricardo S. Santos; Luiz C. A. Oliveira; Márcio C. Pereira

How to cite this article

 

The transesterification reaction of triacylglycerides in bio-oils to form methyl esters is catalyzed by a system consisting of KI supported on SiO2 and γ-Fe2O3; the solid catalyst may be thus removed with a magnet, to be reused in subsequent reaction cycles.

http://dx.doi.org/10.5935/0103-5053.20160124

Published online: April 26, 2016

J. Braz. Chem. Soc. 2016, 27(12), 2300-2311

Design of a New Molecularly Imprinted Polymer Selective for Hydrochlorothiazide Based on Theoretical Predictions Using Gibbs Free Energy

Leonardo A. Barros; Rogério Custodio; Susanne Rath

How to cite this article

 

Molecular modeling was used to design a molecularly imprinted polymer for the diuretic drug hydrochlorothiazide.

http://dx.doi.org/10.5935/0103-5053.20160126

Published online: April 26, 2016


J. Braz. Chem. Soc. 2016, 27(12), 2312-2321

Fragmental Method KowWIN as the Powerful Tool for Prediction of Chromatographic Behavior of Novel Bioactive Urea Derivatives

Jolanta Flieger; Małgorzata Tatarczak-Michalewska; Anna Kowalska; Marzena Rządkowska; Elżbieta Szacoń; Agnieszka A. Kaczor; Dariusz Matosiuk

How to cite this article

 

Fragmental method KowWIN is the most successful software to anticipate chromatographic lipophilicity on cholesterol column.

http://dx.doi.org/10.5935/0103-5053.20160128

Published online: April 27, 2016


J. Braz. Chem. Soc. 2016, 27(12), 2322-2333

Crystal Structures of 1-Aryl-1H- and 2-Aryl-2H-1,2,3-triazolyl Hydrazones. Conformational Consequences of Different Classical Hydrogen Bonds

Daniel T. G. Gonzaga; Fernando C. da Silva; Vitor F. Ferreira; James L. Wardell; Solange M. S. V. Wardell

How to cite this article

 

The crystal structures of the 1H-1,2,3-triazole derivatives are reported. The formations of (Z)-arrangements about the C=N bonds in some of the compounds arise from the stabilizing presence of intramolecular N-H···N hydrogen bonds, while in other presence of intramolecular N-H···O hydrogen bonds reinforces the (E) geometry.

http://dx.doi.org/10.5935/0103-5053.20160129

Published online: April 27, 2016


J. Braz. Chem. Soc. 2016, 27(12), 2334-2347

Metal Complex Derivatives of Azole: a Study on Their Synthesis, Characterization, and Antibacterial and Antifungal Activities

Keshia F. Castillo; Nestor J. Bello-Vieda; Nelson G. Nuñez-Dallos; Homero F. Pastrana; Adriana M. Celis; Silvia Restrepo; John J. Hurtado; Alba G. Ávila

How to cite this article

 

Zn2+, Cu2+, Co2+ complex derivatives of azoles synthesized for in vitro antimicrobial activity.

http://dx.doi.org/10.5935/0103-5053.20160130

Published online: April 28, 2016


J. Braz. Chem. Soc. 2016, 27(12), 2348-2353

Simultaneous Determination of Rare Earth Elements by ICP OES After On-Line Enrichment Using Multi-Walled Carbon Nanotubes Coated Cellulose Acetate Membrane

Ehsan Zolfonoun; Seyed Reza Yousefi

How to cite this article

 

A fast on-line preconcentration method for determination of rare earth elements by ICP OES.

http://dx.doi.org/10.5935/0103-5053.20160131

Published online: April 28, 2016

J. Braz. Chem. Soc. 2016, 27(12), 2354-2360

Catalytic Capture of CO2 with Template-Containing Zn/MCM-41 and Its Transformation to Solid Carbonate

Mahtab Pirouzmand; Behnaz Nikzad-Kojanag; Seyed Abolfazl Hosseini-Yazdi

How to cite this article

 

Template-containing Zn/MCM-41 prepared by template ion exchange method is a green, stable, reusable, and convenient catalyst for CO2 hydration, and produces pure calcite phase CaCO3.

http://dx.doi.org/10.5935/0103-5053.20160133

Published online: May 3, 2016


J. Braz. Chem. Soc. 2016, 27(12), 2361-2371

Gas-Phase Conversion of Glycerol to Acetol: Influence of Support Acidity on the Catalytic Stability and Copper Surface Properties on the Activity

Tiago Pinheiro Braga; Nadine Essayem; Swamy Prakash; Antoninho Valentini

How to cite this article

 

Catalytic results showed a dependence of the glycerol conversion to acetol with the Cu metal surface and the initial catalytic properties did not depend on the support acidity. The support acidity influenced the stability, since Cu-Al solid deactivated continuously (high carbon deposition) by contrast to Cu-Si sample (low carbon deposition).

http://dx.doi.org/10.5935/0103-5053.20160134

Published online: May 3, 2016

J. Braz. Chem. Soc. 2016, 27(12), 2372-2377

Principal Component Analysis of Commercial Tannin Extracts Using Digital Images on Mobile Devices

Fábio S. Grasel; Marco F. Ferrão; Gilson A. Helfer; Adilson B. Costa

How to cite this article

 

In this work, a new methodology is proposed based on digital images taken on a smartphone, using the new PhotoMetrix® application for the identification of tannins according the source type (chestnut, valonea, quebracho, black wattle, tara and myrobalan).

http://dx.doi.org/10.5935/0103-5053.20160135

Published online: May 4, 2016

Short Report J. Braz. Chem. Soc. 2016, 27(12), 2378-2382

Ultrasound-Assisted Synthesis of Isatin-Type 5'-(4-Alkyl/Aryl-1H-1,2,3-triazoles) via 1,3-Dipolar Cycloaddition Reactions

Bianca N. M. Silva; Angelo C. Pinto; Fernando C. Silva; Vitor F. Ferreira; Bárbara V. Silva

How to cite this article

 

5'-(4-Alkyl/aryl-1H-1,2,3-triazoles) was prepared under acidic conditions and ultrasound irradiation in just 5 minutes.

This paper is part of the PubliSBQ Special Issue in honor of the late Prof Angelo da Cunha Pinto.

http://dx.doi.org/10.5935/0103-5053.20160121

Published online: April 19, 2016

J. Braz. Chem. Soc. 2016, 27(12), 2383-2387

Alternative Model for RND-Type Efflux Pump

Pedro Henrique Monteiro Torres; Pedro Geraldo Pascutti; Paulo Mascarello Bisch; Manuela Leal da Silva

How to cite this article

 

Construction of a complete model of the E. coli resistance-nodulation-division RND-type efflux pump by comparative modeling. The highlighted interface was based on the organization of MacA homododecamer.

http://dx.doi.org/10.5935/0103-5053.20160125

Published online: April 26, 2016

J. Braz. Chem. Soc. 2016, 27(12), 2388-2391

A One-Pot Domino Synthesis of 5-(Trifluoromethyl)-2-thiazolamine

Xue-fei Bao; Xue-jun Qiao; Xiao Hou; Wu-hong Fang; Xue-long Liu; Guo-liang Chen

How to cite this article

 

A low-cost, one-pot multicomponent domino synthetic route has been developed for the synthesis of 5-(trifluoromethyl)-2-thiazolamine, which was successfully prepared from 3-bromo-1,1,1-trifluoro-2-propanone, phosphorus pentasulfide and cyanamide in the presence of sodium carbonate with the yield of 56%.

http://dx.doi.org/10.5935/0103-5053.20160132

Published online: May 3, 2016

Online version ISSN 1678-4790 Printed version ISSN 0103-5053
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