JBCS

9:41, Tue May 23

Open Access/APCs

vol. 24, No. 2, 2013, p. 177-362

 

Tribute of the SBQ and the JBCS to Professor Fernando Galembeck on his 70th birthday

As part of the honors that the Brazilian Chemical Society, SBQ, is paying to Professor Fernando Galembeck, on his 70th birthday, for his significant contribution to chemistry and to the SBQ, its Directory and Advisory Board, together with the Editors of the Journal of the Brazilian Chemical Society (JBCS), decided to publish this JBCS Special Issue dedicated to Professor Galembeck.
To reach 70, in full activity, respected by the academic, scientific and business communities in Brazil and abroad, as well as by the governmental agencies, as Professor Fernando Galembeck has done, is an achievement few Brazilian scientists have got to.

(Read more at Editorial)

Tribute of the SBQ and the JBCS to Professor Fernando Galembeck on his 70th birthday




Editorial J. Braz. Chem. Soc. 2013, 24(2), 177-178

Tribute of the SBQ and the JBCS to Professor Fernando Galembeck on his 70th birthday

Aldo J. G. Zarbin; Angelo C. Pinto; Jailson B. de Andrade

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http://dx.doi.org/10.5935/0103-5053.20130022


Communication J. Braz. Chem. Soc. 2013, 24(2), 179-183

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

Bianca N. M. Silva; Bárbara V. Silva; Fernando C. Silva; Daniel T. G. Gonzaga; Vitor F. Ferreira; Angelo C. Pinto

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This work describes the synthesis of a novel isatin-type 5'-(4-alkyl/aryl-1H- 1,2,3-triazoles) series whose derivatives are promising candidates for the treatment of different illnesses, including cancer and neglected diseases, among others.

http://dx.doi.org/10.5935/0103-5053.20130023

Published online: February 7, 2013


Articles J. Braz. Chem. Soc. 2013, 24(2), 184-190

Stereoselective Total Synthesis of the Potent Anti-Asthmatic Compound CMI-977 (LDP-977)

Luiz Carlos Dias; Lui Strambi Farina; Marco Antonio Barbosa Ferreira

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The anti-asthmatic compound CMI-977 (LDP-977) was prepared in 9 steps from p-fluorophenol. The key steps involve a Mukaiyama oxidative cyclization, which provides the trans-THF unit, and a Seyferth-Gilbert homologation to construct the triple bond in the target molecule.

http://dx.doi.org/10.5935/0103-5053.20130024

Published online: December 7, 2012


J. Braz. Chem. Soc. 2013, 24(2), 191-200

Metal Nanostructures with Magnetic and Biodegradable Properties for Medical Applications

Giacomo Ruggeri; Vera L. Covolan; Marco Bernabò; Li M. Li; Leonardo F. Valadares; Carlos A. P. Leite; Fernando Galembeck

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Nanoparticles are introduced in many materials composition to enhance its performance. Poly-lactic acid enclosing gold nanoparticles (AuNP), superparamgnetic iron oxide nanoparticles (SPION) and SPION@AuNP presented in this work are examples of materials with synergistic properties

http://dx.doi.org/10.5935/0103-5053.20130025

Published online: December 12, 2012


J. Braz. Chem. Soc. 2013, 24(2), 201-211

Structure-Based Drug Design Studies on a Series of Aldolase Inhibitors

Leonardo G. Ferreira; Ricardo N. dos Santos; Adriano D. Andricopulo

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3D QSAR models with high internal and external consistency and predictive power were integrated with molecular docking and molecular dynamics to provide insights into the structural basis for selective inhibition of the Trypanosoma brucei aldolase enzyme.

http://dx.doi.org/10.5935/0103-5053.20130026

Published online: January 11, 2013

J. Braz. Chem. Soc. 2013, 24(2), 212-218

A Green Hunsdiecker Reaction of Cinnamic Acids

Leonardo R. Sodré; Pierre M. Esteves; Marcio C. S. de Mattos

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Safe, recyclable, easily handleable and inexpensive tribromo- and trichloroisocyanuric acids react with cinnamic acids in NaOH/H2O/Et2O at room temperature to produce (E)-2-halostyrenes regioselectively in 25-95% yield, through an electrophilic mechanism.

http://dx.doi.org/10.5935/0103-5053.20130027

Published online: January 11, 2013

J. Braz. Chem. Soc. 2013, 24(2), 219-229

Tautomerism in Quinoxalines Derived from the 1,4-Naphthoquinone Nucleus: Acid Mediated Synthesis, X-ray Molecular Structure of 5-Chlorobenzo[f]quinoxalin-6-ol and Density Functional Theory Calculations

Javier A. G. Gomez; Mateus R. Lage; José Walkimar de M. Carneiro; Jackson A. L. C. Resende; Maria D. Vargas

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This novel benzoquinoxaline exists as the enol-imine rather than the keto-amine tautomer in the solid state and in solution. DFT calculations on the tautomers of related compounds showed that the relative stabilities are dominated by the degree of aromaticity or solvation effects.

http://dx.doi.org/10.5935/0103-5053.20130028

Published online: January 16, 2013


J. Braz. Chem. Soc. 2013, 24(2), 230-235

(–)-7-Hydroxycassine: a New 2,6-Dialkylpiperidin-3-ol Alkaloid and other Constituents Isolated from Flowers and Fruits of Senna spectabilis (Fabaceae)

Cláudio Viegas Junior; Marcos Pivatto; Amanda de Rezende; Lidilhone Hamerski; Dulce Helena Siqueira Silva; Vanderlan da Silva Bolzani

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The phytochemical study of flowers and green fruits of Senna spectabilis has furnished a new 2,6-dialkylpiperidin-3-ol alkaloid, named (–)-7-hydroxycassine, along with five known chemical constituents β-sitosterol, luteolin, 3-methoxyluteolin, betulinic acid and trans-cinnamic acid, that are being reported for the first time in this species.

http://dx.doi.org/10.5935/0103-5053.20130029

Published online: January 22, 2013


J. Braz. Chem. Soc. 2013, 24(2), 236-240

Theoretical Spectroscopic Study of the Conjugate Microcystin-LR-Europium Cryptate

Júlio G. Santos; José Diogo L. Dutra; Severino Alves Junior; Gilberto F. de Sá; Nivan B. da Costa Junior; Ricardo O. Freire

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Theoretical tools were used to study spectroscopic properties of the conjugate Microcystin-LR-europium cryptate. The theoretical quantum yield of luminescence (23%) suggests this luminescent system as an excellent conjugate to be used in the ELISA assay for detection by luminescence of the Microcystin-LR in water.

http://dx.doi.org/10.5935/0103-5053.20130030

Published online: January 22, 2013

J. Braz. Chem. Soc. 2013, 24(2), 241-245

Time-Resolved Fluorescence Quenching Studies of Sodium Lauryl Ether Sulfate Micelles

Leidi C. Friedrich; Volnir O. Silva; Paulo F. Moreira Jr.; Celize M. Tcacenco; Frank H. Quina

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The added-salt dependent growth of sodium lauryl ether sulfate (SLES) micelles, determined by time-resolved fluorescence quenching, is distinct from that of sodium alkyl sulfate micelles, consistent with a larger headgroup size of SLES.

http://dx.doi.org/10.5935/0103-5053.20130031

Published online: February 7, 2013

J. Braz. Chem. Soc. 2013, 24(2), 246-255

Distributions of Trace Metals in Sediment Cores from a Hypertrophic Reservoir in Northeast Brazil

Izaias S. Santos; Carlos A. B. Garcia; Elisangela A. Passos; Jose P. H. Alves

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The present work presents the vertical distributions of the metals Al, Cu, Co, Cr, Fe, Mn, Ni, Pb and Zn in two sediment cores from the Macela Reservoir, located in Sergipe State in Northeast Brazil.

http://dx.doi.org/10.5935/0103-5053.20130032

Published online: February 7, 2013


J. Braz. Chem. Soc. 2013, 24(2), 256-265

Gas-Phase Nucleophilic Reactivity of Alkoxysilanes

Thiago C. Correra; Luciano A. Xavier; José M. Riveros

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Simple anionic nucleophiles react with alkoxysilanes in the gas-phase by formation of a hypervalent siliconate species that can undergo further elimination by different channels leading to the formation of carbanions or siloxide-type anions.

http://dx.doi.org/10.5935/0103-5053.20130033

Published online: February 7, 2013


J. Braz. Chem. Soc. 2013, 24(2), 266-272

New Hybrid Material Based on Layered Double Hydroxides and Biogenic Silver Nanoparticles: Antimicrobial Activity and Cytotoxic Effect

Priscyla D. Marcato; Natália V. Parizotto; Diego Stéfani T. Martinez; Amauri J. Paula; Iasmin R. Ferreira; Patrícia S. Melo; Nelson Durán; Oswaldo L. Alves

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A new hybrid material based on biogenic silver nanoparticles strongly adsorbed in layered double hydroxides (LDHs) exhibited antimicrobial activity and no cytotoxic effect on fibroblast cell cultures demonstrating to be an interesting nanobiocomposite for biomedical and cosmetic applications.

http://dx.doi.org/10.5935/0103-5053.20130034

Published online: February 14, 2013

J. Braz. Chem. Soc. 2013, 24(2), 273-279

The Role of Humidity on the Lift-off of Particles in Electric Fields

Mamadou Sow; Ross Widenor; A. Rufus Akande; Kelly S. Robinson; R. Mohan Sankaran; Daniel J. Lacks

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Particles can be lifted in electric fields. It is shown that the lifting of charged hydrophobic particles is consistent with a model for insulating particles, but the lifting of hydrophilic particles is consistent with a model for insulating particles at low humidity and a model for conducting particles at high humidity.

http://dx.doi.org/10.5935/0103-5053.20130035

Published online: February 15, 2013

J. Braz. Chem. Soc. 2013, 24(2), 280-284

A Fast Sonochemical Method to Prepare 1D and 3D Nanostructures of Bismuth Sulfide

Paulo R. R. Mesquita; Jorge S. Almeida; Leonardo S. G. Teixeira; Antônio F. da Silva; Luciana A. Silva

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SEM (scanning electron microscopy) images of Bi2S3 prepared by refluxing (a-b) and sonochemical methods (c-d) show that in both cases flower-like superstructures are formed. Sonochemical method yields these flower-like superstructures with better morphological homogeneity.

http://dx.doi.org/10.5935/0103-5053.20130036

Published online: February 18, 2013

J. Braz. Chem. Soc. 2013, 24(2), 285-294

Highly Stable Magnetite Modified with Chitosan, Ferrocene and Enzyme for Application in Magneto-Switchable Bioelectrocatalysis

Antonio F. A. A. Melo; Roberto A. S. Luz; Rodrigo M. Iost; Iseli L. Nantes; Frank N. Crespilho

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An advance in the magnetic control of bioelectrochemical reactions, by construction of a system containing simultaneously a magnetic particle (for controlled driving), an enzyme (for biocatalysis) and a redox mediator (for mediation of electron transfer) is reported.

http://dx.doi.org/10.5935/0103-5053.20130037

Published online: February 18, 2013

J. Braz. Chem. Soc. 2013, 24(2), 295-303

Cellulose Dissolution in an Alkali Based Solvent: Influence of Additives and Pretreatments

Martin Kihlman; Bruno F. Medronho; Anabela L. Romano; Ulf Germgård; Bjorn Lindman

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The graphical abstract shows that mixing cellulose pulp with a solvent composed by NaOH/H2O and some additives such as surfactant molecules and/or salts it is possible to obtain a nice and clear solution without undissolved material as seen by the inserted optical micrograph.

http://dx.doi.org/10.5935/0103-5053.20130038

Published online: February 21, 2013

J. Braz. Chem. Soc. 2013, 24(2), 304-313

Superabsorbent Hydrogel Composite with Minerals Aimed at Water Sustainability

Antônio Sávio G. Magalhães; Manuel P. Almeida Neto; Maslândia N. Bezerra; Judith P. A. Feitosa

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The hydrogel absorbs and retains a huge amount of water. When applied to soil it increases the water-holding and/or nutrient retention capacity, and improves plant growth. An efficient use of water is promoted contributing to water sustainability.

http://dx.doi.org/10.5935/0103-5053.20130039

Published online: February 26, 2013

J. Braz. Chem. Soc. 2013, 24(2), 314-319

Turning Used Frying Oil into a New Raw Material to Printing Inks

Vinícius M. Mello; Gustavo V. Oliveira; Paulo A. Z. Suarez

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Used frying oil has produced biobased resins, which were successfully employed as binder in printing ink (offset or typographic printers) formulations.

http://dx.doi.org/10.5935/0103-5053.20130040

Published online: February 27, 2013

J. Braz. Chem. Soc. 2013, 24(2), 320-326

13C NMR and EPR Spectroscopic Evaluation of Oil Shale Mined Soil Recuperation

J. V. dos Santos; A. S. Mangrich; B. F. Pereira; C. N. Pillon; E. H. Novotny; T. J. Bonagamba; G. Abbt-Braun; F. H. Frimmel

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2D Hetero-spectral 13C nuclear magnetic resonance (NMR) and electron paramagnetic resonance (EPR) (ΔB = 80 mT, g ca. 2, s derivative mode) correlation spectrum of the studied mined and natural soil samples. The data suggest uronic acid interacting with the hard acid metal ion VO2+, and not cathecol or salicylic acid structures as is pointed normally for the complexation of hard acid metal ion with natural organic matter (NOM).

http://dx.doi.org/10.5935/0103-5053.20130041

Published online: February 27, 2013

J. Braz. Chem. Soc. 2013, 24(2), 327-335

Coprecipitation of Safrole Oxide with Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) in Supercritical Carbon Dioxide

Ernandes T. Tenório-Neto; Expedito L. Silva; Thelma S. Pacheco Cellet; Elisangela P. Silva; Elton Franceschi; Lúcio C. Filho; Adley F. Rubira; Marcos H. Kunita

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Safrole Oxide (SO) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) microparticles were obtained using solution enhanced dispersion by supercritical fluid (SEDS). Different shapes were observed for coprecipitated SO/PHBV, and were dependent on the experimental-processing conditions.

http://dx.doi.org/10.5935/0103-5053.20130042

Published online: February 27, 2013


J. Braz. Chem. Soc. 2013, 24(2), 336-343

Hosted Formation of PbS Crystals on Polyethylene Modified Surface

Vanessa H. Fragal; Rafael Silva; Thelma P. Cellet; Guilherme M. Pereira; Marcos H. Kunita; Edvani C. Muniz; Adley F. Rubira

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This work describes an approach to the growth of lead sulfide (PbS) micro and nanocrystals in poly(acrylic acid) (PAA) ultrathin film. The morphology of the composite formed can be adjusted by controlling the Pb2+ and thioacetamide (TAA) concentrations and the pH value of the TAA solution.

http://dx.doi.org/10.5935/0103-5053.20130043

Published online: February 27, 2013

J. Braz. Chem. Soc. 2013, 24(2), 344-354

Effect of Iron Content on the Catalytic Properties of Activated Carbon-Supported Magnetite Derived from Biomass

Sirlene B. Lima; Sarah Maria S. Borges; Maria do Carmo Rangel; Sergio G. Marchetti

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During the preparation of the activated carbon-supported magnetite from coconut shells, iron nitrate fills the pores where it is converted to hematite upon heating under air flow. At 450 ºC, carbon monoxide is produced and then reduces the hematite to produce magnetite particles with a hematite core.

http://dx.doi.org/10.5935/0103-5053.20130044

Published online: February 28, 2013

J. Braz. Chem. Soc. 2013, 24(2), 355-362

Extraction and Evaluation of Fatty Acid Compositon of Orbignya phalerata Martius Oils (Arecaceae) from Maranhão State, Brazil

Débora S. Santos; Ilna G. da Silva; Bruno Q. Araújo; Cícero A. Lopes Júnior; Nayana B. N. Monção; Antônia M. das G. L. Citó; Mércia H. S. L. de Souza; Maria do D. S. B. Nascimento; Maria Célia Pires Costa

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Babassu nuts, Orbignya phalerata Martius (Arecaceae), were collected from different regions of Maranhão State, Brazil. The extracted babassu oils were analyzed by gas chromatography-mass spectrometry (GC-MS) after derivatization and the relative composition of the fatty acids was used to perform a discriminating analysis of the biodiversity of O. phalerata from Maranhão.

http://dx.doi.org/10.5935/0103-5053.20130045

Published online: February 28, 2013

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