JBCS

22:53, Thu Jun 22

Open Access/APCs

vol. 23, No. 12, 2012, p. 2131-2270

 

Journal of the Brazilian Chemical Society: an Example of Success in the Brazilian Chemistry

Another cycle of the Journal of the Brazilian Chemical Society (JBCS) is closed with our voluntary departure from the editorship in this last issue of 2012. We have been part of it since 1987, when it was conceived by Professor Eduardo Motta Alves Peixoto, its first editor. Now we can proudly say that we are leaving the Journal as the best chemistry journal in Latin America and among the BRICS bloc.
The creation of the JBCS was possible thanks to the Program for the Support of Scientific and Technological Development - PADCT, by means of the public notice QEQ 01/87-10 to "support the scientific dissemination".

(Read more at Editorial)


Cover Article
J. Braz. Chem. Soc. 2012, 23(12), 2204-2210

The Influence of Asphaltenes Subfractions on the Stability of Crude oil Model Emulsions

Siller O. Honse; Claudia R. E. Mansur; Elizabete F. Lucas

How to cite this article

Model water-in-oil emulsions were prepared with different asphaltenes subfractions. The influence of these fractions on the stability of petroleum model emulsions and on the efficiency of demulsifiers were evaluated by Bottle test and measurements of the interfacial tension. Details are discussed in the Article The Influence of Asphaltenes Subfractions on the Stability of Crude oil Model Emulsions by Siller O. Honse, Claudia R. E. Mansur and Elizabete F. Lucas on page 2204.

http://dx.doi.org/10.1590/S0103-50532013005000002

Published online: January 9, 2013

Editorial J. Braz. Chem. Soc. 2012, 23(12), 2131-2132

Journal of the Brazilian Chemical Society: an Example of Success in the Brazilian Chemistry

Angelo C. Pinto; Jailson B. de Andrade

How to cite this article

 

http://dx.doi.org/10.1590/S0103-50532012001200001


Communication J. Braz. Chem. Soc. 2012, 23(12), 2133-2136

Isolation and Amino Acid Sequencing by MALDI-TOF-MS/MS of a Novel Antimicrobial Anionic Peptide from the Skin Secretion of Osteocephalus taurinus (Anura, Hylidae)

Túlio O. G. Costa; Richardson A. Almeida, Jorge T. Melo; Hector H. F. Koolen; Felipe M. A. da Silva; José Roberto S. A. Leite; Maura V. Prates; Carlos Bloch Jr.; Angelo C. Pinto

How to cite this article

 

From the crude skin secretion of the Osteocephalus taurinus frog a novel peptide named otacidin was isolated. The de novo sequencing of this peptide was made by MALDI-TOF-MS/MS analysis, which revealed to be an anionic peptide, being only the second report of this type of peptide from an amphibian. Otacidin was tested against some bacteria presenting slight antimicrobial activity.

http://dx.doi.org/10.1590/S0103-50532012001200002

Published online: January 30, 2013

Reviews J. Braz. Chem. Soc. 2012, 23(12), 2137-2158

Metal-Catalyzed Asymmetric Aldol Reactions

Luiz C. Dias; Emílio C. de Lucca Jr.; Marco A. B. Ferreira; Ellen C. Polo

How to cite this article

 

This review focuses on the development of metal-mediated chiral catalysts in Mukaiyama-type aldol reactions, reductive aldol reactions, direct aldol reactions and the application of these catalysts in the total synthesis of complex molecules.

http://dx.doi.org/10.1590/S0103-50532012001200003

Published online: January 22, 2013

J. Braz. Chem. Soc. 2012, 23(12), 2159-2175

The Oxidative Stability of Biodiesel and its Impact on the Deterioration of Metallic and Polymeric Materials: a Review

Ernesto C. Zuleta; Libia Baena; Luis A. Rios; Jorge A. Calderón

How to cite this article

 

During the oxidation process of biodiesel, methyl esters of fatty acids form a radical which quickly binds with oxygen in the air forming volatile products such as aldehydes, ketones, lactones, and formic, acetic, propionic and caproic acids. Products formed during the autoxidation of biodiesel can increase their corrosivity and stimulate the degradation of materials.

http://dx.doi.org/10.1590/S0103-50532012001200004

Published online: January 29, 2013

Articles J. Braz. Chem. Soc. 2012, 23(12), 2176-2182

Adapting the Reducing Sugars Method with Dinitrosalicylic Acid to Microtiter Plates and Microwave Heating

Anamaria Negrulescu; Viorica Patrulea; Manuela M. Mincea; Cosmin Ionascu; Beatrice A. Vlad-Oros; Vasile Ostafe

How to cite this article

 

For the assay of sugars with DNS reagent, using microtiter plates, the heating step can be performed in a water bath accommodated in a microwave oven.

http://dx.doi.org/10.1590/S0103-50532013005000003

Published online: December 21, 2013

J. Braz. Chem. Soc. 2012, 23(12), 2183-2190

Structure-Activity Relationship Study of Rutaecarpine Analogous Active Against Central Nervous System Cancer

Gabriel R. Martins; Hamilton B. Napolitano; Lilian T. F. M. Camargo; Ademir J. Camargo

How to cite this article

 

The partial charges derived from electrostatic potential on atoms C4 and H23 and the bond orders between atoms C2 and C4, C3 and C6, and C10 and N15 explain correctly the biological activity of a set of 21 rutaecarpine derivatives synthesized and tested against central nervous system cancer.

http://dx.doi.org/10.1590/S0103-50532013005000004

Published online: December 21, 2012

J. Braz. Chem. Soc. 2012, 23(12), 2191-2196

A Fragment-Based Approach for the in Silico Prediction of Blood-Brain Barrier Permeation

Tiago L. Moda; Alexandre E. Carrara; Adriano D. Andricopulo

How to cite this article

 

Quantitative structure-property relationship (QSPR) studies were conducted in this work for the development of useful in silico models for the prediction of blood-brain barrier permeation, using a large data set containing 255 structurally diverse compounds.

http://dx.doi.org/10.1590/S0103-50532013005000001

Published online: January 9, 2013


J. Braz. Chem. Soc. 2012, 23(12), 2197-2203

A Novel Approach for the Synthesis of 5-Substituted-1H-tetrazoles

Batool Akhlaghinia; Soodabeh Rezazadeh

How to cite this article

 

A series of 5-substituted-1H-tetrazoles (RCN4H) have been synthesized by cycloaddition reaction of different aryl and alkyl nitriles with sodium azide in DMSO using CuSO4.5H2O as catalyst. The catalyst used is readily available and environmentally friendly.

http://dx.doi.org/10.1590/S0103-50532013005000005

Published online: January 9, 2013


J. Braz. Chem. Soc. 2012, 23(12), 2204-2210

The Influence of Asphaltenes Subfractions on the Stability of Crude oil Model Emulsions

Siller O. Honse; Claudia R. E. Mansur; Elizabete F. Lucas

How to cite this article

 

Micrographies (inverted optical microscope) of water-in-oil model emulsions prepared with different asphaltenes fraction (fraction C5 and subfraction C8-C9) extract from a crude oil asphaltic residue.

http://dx.doi.org/10.1590/S0103-50532013005000002

Published online: January 9, 2013

J. Braz. Chem. Soc. 2012, 23(12), 2211-2221

The Use of Cloud Point Extraction and Hydride Generation for Improving the Sb and Se Limits of Detection in ICP OES

Fernanda dos Santos Depoi; Dirce Pozebon

How to cite this article

 

Hydride generation (HG) and inductively coupled plasma optical emission spectrometry (ICP OES) were investigated and employed for Se and Sb determination. Cloud point extraction was used for analyte preconcentration. The HG performance was compared with that of pneumatic nebulization.

http://dx.doi.org/10.1590/S0103-50532012001200010

Published online: January 9, 2013

J. Braz. Chem. Soc. 2012, 23(12), 2222-2231

Development of an Amperometric Enzyme Electrode based on Poly(o-Phenylenediamine) for the Determination of Total Cholesterol in Serum

Derya Koyuncu Zeybek; Bülent Zeybek; Nuran Özçiçek Pekmez; Şule Pekyardımcı; Esma Kılıçc

How to cite this article

 

In enzymatic reaction, cholest-4-en-3-one and hydrogen peroxide form. The oxidation current of hydrogen peroxide can be detected at applied potential and the current is proportional to the concentration of cholesterol.

http://dx.doi.org/10.1590/S0103-50532012001200011

Published online: January 11, 2013

J. Braz. Chem. Soc. 2012, 23(12), 2232-2236

Extraction and on-Fiber Derivatization of Chlorophenols in Leather by Internally Cooled Solid Phase Microextraction

Cristine D. de Souza Silveira; Josias Merib; Edmar Martendal; Eduardo Carasek

How to cite this article

 

The study proposes a new analytical procedure based on an internally cooled solid phase microextraction technique (CF-SPME) combined with on-fiber derivatization and gas chromatography-selected ion monitoring-mass spectrometry.

http://dx.doi.org/10.1590/S0103-50532012001200012

Published online: January 16, 2013

J. Braz. Chem. Soc. 2012, 23(12), 2237-2247

Photophysics and Spectroscopic Properties of Zinc Phthalocyanine Revisited using Quantum Chemistry

Leonardo T. Ueno; Cristiano C. Jayme; Lucilia R. Silva; Estevão B. Pereira; Samuel M. de Oliveira; Antonio E. H. Machado

How to cite this article

 

The present paper reports an accurate theoretical description of absorption, fluorescence and phosphorescence spectra of zinc phthalocyanine using TD-DFT.

http://dx.doi.org/10.1590/S0103-50532012001200013

Published online: January 16, 2013

J. Braz. Chem. Soc. 2012, 23(12), 2248-2257

Application of β-Cyclodextrin/MnFe2O4 Magnetic Nanoparticles as a Catalyst for Fast Chemiluminescence Determination of Glutathione in Human Blood using Luminol-Diperiodatoargentate(III) System

Behzad Rezaei; Ali A. Ensafi; Fariba Haghighatnia; Saeed E. Aalaye

How to cite this article

 

The chemiluminescence (CL) of the reaction, luminol-diperiodatoargentate(III) system, with catalytic effect of β-CD/MnFe2O4 magnetic nanoparticles is successfully applied for rapid and sensitive determination of glutathione in human blood samples.

http://dx.doi.org/10.1590/S0103-50532012001200014

Published online: January 22, 2013

J. Braz. Chem. Soc. 2012, 23(12), 2258-2265

Rainwater Major and Trace Element Contents in Southeastern Brazil: an Assessment of a Sugar Cane Region in Dry and Wet Period

Patrícia L. Oliveira; Bernardino R. Figueiredo; Arnaldo A. Cardoso

How to cite this article

 

The chemical and mineralogical composition of the rainwater in Araraquara City, Brazil, is influenced by diversity sources of atmospheric pollutants such as (a) pre-harvest burning of sugar cane crops, (b) re-suspended dust derived from soils
and (c) vehicle emissions.

http://dx.doi.org/10.1590/S0103-50532012001200015

Published online: January 25, 2013

J. Braz. Chem. Soc. 2012, 23(12), 2266-2270

Synthesis and Phytotoxicity of 4,5 Functionalized Tetrahydrofuran-2-ones

Gabriela C. Resende; Elson S. Alvarenga; Juan C. G. Galindo; Francisco A. Macias

How to cite this article

 

We report a versatile synthesis of fourteen γ-lactones structurally related, which had their phytotoxic activity evaluated in vitro by the influence on the growth of wheat (Triticum aestivum) coleoptiles. 5-Isopropoxyfuran-2(5H)-one presented 76% inhibition of the coleoptiles at 1000 μmol L-1 compared to the control.

http://dx.doi.org/10.1590/S0103-50532012001200016

Published online: January 30, 2013

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

Tel/Fax: +55.19.3521.3151
Free access

GN1