JBCS

8:10, Thu Apr 27

Open Access/APCs

vol. 25, No. 1, 2014, p. 1-182

 

Good times ahead - Enjoy the New Year!

It seems like it each year goes by faster and faster. We still remember the lights of Christmas and it is time to celebrate it again. As usual, here at the JBCS we think about what we have done and we put lots of expectations about what we want to do. One of our expectations for 2013 was the launching of the Scholar One Platform for the Journal of the Brazilian Chemical Society.1 We made it! Together with all of you, we were successful and we do think that authors, reviewers, editors and staff are enjoying and benefiting from it. It is always challenging to move from solid ground to a new platform, but we should not resist to progress. In a short time we are seeing the average time of publication going down to around 4 months from submission to online publication.

(Read more at Editorial)


Cover Article
J. Braz. Chem. Soc. 2014, 25(1), 9-19

New Trends in Sample Preparation in Brazil: an Overview of Bioanalytical Applications by Liquid Chromatography

Neila M. Cassiano; Juliana C. Barreiro; Quezia B. Cass

How to cite this article

The need to attain high throughput analysis of small molecules by liquid chromatography (LC) in a variety of bioanalytical scenarios is usually associated to higher LC efficiency. Although this is a premise, the sample clean-up step is always the bottleneck. This review encompasses the Brazilian researches efforts in achieving high-efficient LC analysis with greener sample preparation approaches. Enhanced sensitivity with cleaner samples affording less chemical and biological residues are usually the main goal of the method procedure herein discussed. Details are presented in the Article New Trends in Sample Preparation in Brazil: an Overview of Bioanalytical Applications by Liquid Chromatography by Neila M. Cassiano, Juliana C. Barreiro and Quezia B. Cass on page 9.

http://dx.doi.org/10.5935/0103-5053.20130282

Published online: November 29, 2013

Editorial J. Braz. Chem. Soc. 2014, 25(1), 1-4

Good times ahead - Enjoy the New Year!

Joaquim A. Nóbrega; Watson Loh

How to cite this article

 

http://dx.doi.org/10.5935/0103-5053.20140001


Account J. Braz. Chem. Soc. 2014, 25(1), 5-8

Chemometrics in Argentina: the Result of Unplanned Events

Alejandro C. Olivieri

How to cite this article

 

The origins and current status of chemometric research in Argentina are described, including references to works in the three main areas of interest: experimental design and optimization, classification and multivariate calibration.

http://dx.doi.org/10.5935/0103-5053.20130266

Published online: November 8, 2013

Review J. Braz. Chem. Soc. 2014, 25(1), 9-19

New Trends in Sample Preparation in Brazil: an Overview of Bioanalytical Applications by Liquid Chromatography

Neila M. Cassiano; Juliana C. Barreiro; Quezia B. Cass

How to cite this article

 

Direct sample injection systems, an excellent approach for green chromatography.

http://dx.doi.org/10.5935/0103-5053.20130282

Published online: November 29, 2013

Articles J. Braz. Chem. Soc. 2014, 25(1), 20-26

Compositions and Antifungal Activities of Essential Oils from Agarwood of Aquilaria sinensis (Lour.) Gilg Induced by Lasiodiplodia theobromae (Pat.) Griffon. & Maubl

Zheng Zhang; Xiao-min Han; Jian-he Wei; Jian Xue; Yun Yang; Liang Liang; Xiu-jin Li; Qing-mei Guo; Yan-hong Xu; Zhi-hui Gao

How to cite this article

 

The results show that the essential oil obtained from the agarwood originating from A. sinensis induced by a fungal-inoculation method had a high similarity to wild agarwood, both in chemical composition and in antimicrobial activity. This is the first report of the analysis of essential oils from fungal-inoculation induced agarwood.

http://dx.doi.org/10.5935/0103-5053.20130263

Published online: November 8, 2013


J. Braz. Chem. Soc. 2014, 25(1), 27-35

New Voltammetry-Based Technique for the Determination of Tebuthiuron in Crystal and Brown Sugar Samples

Andiara P. de Assis; Leonardo L. Okumura; Adelir A. Saczk; Marcelo F. de Oliveira

How to cite this article

 

This paper proposes a reliable method to analyze the herbicide tebuthiuron (TBH) in sugar matrixes (brown and crystal) using square wave voltammetry (SWV) and differential pulse voltammetry (DPV) at bare glassy carbon electrode.

http://dx.doi.org/10.5935/0103-5053.20130264

Published online: November 8, 2013

J. Braz. Chem. Soc. 2014, 25(1), 36-49

Enrichment of Tropical Peat with Micronutrients for Agricultural Applications: Evaluation of Adsorption and Desorption Processes

Camila de A. Melo; Lilian K. de Oliveira; Danielle Goveia; Leonardo F. Fraceto; André H. Rosa

How to cite this article

 

Peat is very rich in organic matter, and is therefore able to both adsorb and release micronutrients. This desorption of micronutrients, together with the presence of organic matter, assists the development of plants.

http://dx.doi.org/10.5935/0103-5053.20130265

Published online: November 8, 2013

J. Braz. Chem. Soc. 2014, 25(1), 50-64

Evaluating Sedimentation Rates in the Estuary and Shelf Region of the Paraíba do Sul River, Southeastern Brazil

Cristiana V. A. Wanderley; José Marcus Godoy; Maria Luiza D. P. Godoy; Carlos Eduardo Rezende; Luiz D. Lacerda; Isabel Moreira; Zenildo L. Carvalho

How to cite this article

 

Aerial view of the Paraíba do Sul River delta region and the Atafona village

http://dx.doi.org/10.5935/0103-5053.20130268

Published online: November 13, 2013


J. Braz. Chem. Soc. 2014, 25(1), 65-74

Effects of Na and K ions on the Crystallization of Low-silica X Zeolite and its Catalytic Performance for Alkylation of Toluene with Methanol

Haitao Hui; Junhua Gao; Gencun Wang; Ping Liu; Kan Zhang

How to cite this article

 

The crystallization of low-silica X zeolite (LSX) was studied in Na-K gel systems with different extents of replacement of Na by K while fixed content of other components. The molar ratio of K/(Na+K) affects the crystallization, composition and catalytic performance of final LSX products.

http://dx.doi.org/10.5935/0103-5053.20130269

Published online: November 13, 2013

J. Braz. Chem. Soc. 2014, 25(1), 75-80

The Development and Validation of a Chiral High Performance Liquid Chromatography Method for the Identification and Quantification of (R)-Enantiomer in 10-Hydroxycamptothecin

A. Venkateshwarlu; A. V. Rama Rao; Mukkanti Khagga; S. V. Subba Reddy

How to cite this article

 

A new, simple, rapid and accurate chiral HPLC method has been developed and validated for the enantiomeric separation and quantitative determination of the isomers of human colon cancer therapeutic drug 10-Hydroxycamptothecin.

http://dx.doi.org/10.5935/0103-5053.20130271

Published online: November 14, 2013

J. Braz. Chem. Soc. 2014, 25(1), 81-90

Assessment of Caffeine Adsorption onto Mild Steel Surface as an Eco-Friendly Corrosion Inhibitor

Fernando S. de Souza; Reinaldo S. Gonçalves; Almir Spinelli

How to cite this article

 

The eco-friendly compound caffeine effectively inhibited steel corrosion in acid medium by virtue of adsorption. The adsorption was consistent with the Frumkin adsorption isotherm. A hydrophobic protective film covered the steel surface.

http://dx.doi.org/10.5935/0103-5053.20130270

Published online: November 14, 2013

J. Braz. Chem. Soc. 2014, 25(1), 91-97

A Comparison of Plating and Reverse Transcriptase Polymerase Chain Reaction Followed by Microchip Electrophoresis for the Inactivation of Alicyclobacillus acidoterrestris Using Saponin

Juliana V. Alberice; Maribel E. Funes-Huacca; Emanuel Carrilho

How to cite this article

 

Experiments were performed using plating and reverse transcriptase polymerase chain reaction followed by microchip electrophoresis to assess the inactivation of Alicyclobacillus acidoterrestris using saponin. The results from both approaches were compared.

http://dx.doi.org/10.5935/0103-5053.20130272

Published online: November 19, 2013

J. Braz. Chem. Soc. 2014, 25(1), 98-103

Inhibitory and Enzyme-Kinetic Investigation of Chelerythrine and Lupeol Isolated from Zanthoxylum rhoifolium Against Krait Snake Venom Acetylcholinesterase

Mustaq Ahmad; Andréia D. Weber; Graciane Zanon; Luciana de C. Tavares; Vinicius Ilha; Ionara I. Dalcol; Ademir F. Morel

How to cite this article

 

In this study, chelerythrine and lupeol isolated from Zanthoxylum rhoifolium were evaluated in vitro against the enzyme acetylcholinesterase (AChE) from the venom of the snake Bungarus sindanus. The alkaloid chelerythrine presented higher activity than did triterpene lupeol.

http://dx.doi.org/10.5935/0103-5053.20130274

Published online: November 22, 2013


J. Braz. Chem. Soc. 2014, 25(1), 104-111

Synthesis and Antimicrobial Properties of 1,3,4-Oxadiazole Analogs Containing Dibenzosuberane Moiety

Manjunath Moger; Vijay Satam; Darshan Raj C. Govindaraju; Paniraj A. S.; Vadiraj S. Gopinath; Rama Mohan Hindupura; Hari N. Pati

How to cite this article

 

Ten analogs of 1,3,4-oxadiazole containing dibenzosuberane moiety (8a-8j) were synthesized, characterized and evaluated for antibacterial as well as antifungal activity.

http://dx.doi.org/10.5935/0103-5053.20130275

Published online: November 22, 2013


J. Braz. Chem. Soc. 2014, 25(1), 112-118

Structural Study and Fluorescent Property of a Novel Organic Microporous Crystalline Material

Zhao Cheng; Bingqin Yang; Meipan Yang; Binglin Zhang

How to cite this article

 

[(2-{2-[2-(Bis-methoxycarbonylmethylamino)phenoxy]ethoxy}-4-benzimidazole-phenyl)methoxycarbonylmethylamino]acetic acid methyl ester,schematic representation (left) and crystal packing to demonstrate the void cage along the c axis (right).

http://dx.doi.org/10.5935/0103-5053.20130276

Published online: November 26, 2013

J. Braz. Chem. Soc. 2014, 25(1), 119-125

Fractionation of Aquatic Humic Substances and Dynamic of Chromium Species in an Aquatic Body Influenced by Sugarcane Cultivation

Amanda M. Tadini; Altair B. Moreira; Márcia C. Bisinoti

How to cite this article

 

In the present work was evaluated the influence of AHS obtained from an area under sugarcane cultivation on the dynamics of chromium species (Cr (III) and Cr (VI)) in the environment.

http://dx.doi.org/10.5935/0103-5053.20130277

Published online: November 26, 2013

J. Braz. Chem. Soc. 2014, 25(1), 126-132

Plasma-Assisted Production of Carbon Black and Carbon Nanotubes from Methane by Thermal Plasma Reform

Vanessa Z. Baldissarelli; Luís Otávio de B. Benetoli; Felipe A. Cassini; Ivan G. de Souza; Nito A. Debacher

How to cite this article

 

A plasma process for carbon black and carbon nanotubes synthesis is presented. The decomposition of methane by thermal plasma generating hydrogen and carbon is proposed as an environmentally-friendly alternative to conventional methods. The main advantage of this process is that the carbon is obtained directly from methane without the formation of by-products.

http://dx.doi.org/10.5935/0103-5053.20130278

Published online: November 26, 2013

J. Braz. Chem. Soc. 2014, 25(1), 133-142

6-Aminocoumarin-Naphthoquinone Conjugates: Design, Synthesis, Photophysical and Electrochemical Properties and DFT Calculations

Fabio S. Miranda; Célia M. Ronconi; Mikaelly O. B. Sousa; Gleiciani Q. Silveira; Maria D. Vargas

How to cite this article

 

TD-DFT calculations of the ground (S0) and excited (S1) states suggest that in 6-aminocoumarin-naphthoquinone conjugates the fluorescent 6-AC donates electrons to the naphthoquinone LUMO resulting in an oxidative photoinduced electron transfer (oxidative-PET).

http://dx.doi.org/10.5935/0103-5053.20130279

Published online: November 26, 2013


J. Braz. Chem. Soc. 2014, 25(1), 143-151

An Easy and Fast Procedure for the Determination of Ca, Cu, Fe, Mn, Mg, Na, K and Si in Biodiesel by ICP OES Using Emulsification as Sample Preparation Strategy

Meibel T. Lisboa; Caroline D. Clasen; Daiane C. de Sousa Vellar; Eliézer Q. Oreste; Tatiana D. Saint'Pierre; Anderson S. Ribeiro; Mariana A. Vieira

How to cite this article

 

This paper presents a procedure based on emulsification with formic acid and Triton X-100 for the determination of Ca, Cu, Fe, Mn, Mg, Na, K and Si in biodiesel samples by ICP OES.

http://dx.doi.org/10.5935/0103-5053.20130280

Published online: November 29, 2013

J. Braz. Chem. Soc. 2014, 25(1), 152-160

Synthesis of Glycerol Carbonate by Transesterification of Glycerol and Dimethyl Carbonate over KF/γ-Al2O3 Catalyst

Zhenmin Liu; Junwei Wang; Maoqing Kang; Ning Yin; Xinkui Wang; Yisheng Tan; Yulei Zhu

How to cite this article

 

A series of KF/γ-Al2O3 catalysts were prepared and used for the synthesis of glycerol carbonate from glycerol and dimethyl carbonate. Glycidol, the main by-product, resulted from the decomposition of glycerol carbonate.

http://dx.doi.org/10.5935/0103-5053.20130281

Published online: November 29, 2013

J. Braz. Chem. Soc. 2014, 25(1), 161-168

Method Validation for Simultaneous Determination of Cholesterol and Cholesterol Oxides in Milk by RP-HPLC-DAD

Luciana C. Bauer; Débora de A. Santana; Marianne dos S. Macedo; Alexandre G. Torres; Nilson E. de Souza; Julliana I. Simionato

How to cite this article

 

This study describes a method for determination of cholesterol oxides in milk by direct sample saponification - extraction and RP - HPLC -DAD.

http://dx.doi.org/10.5935/0103-5053.20130283

Published online: November 29, 2013

Short Report J. Braz. Chem. Soc. 2014, 25(1), 169-175

UV-Vis Spectrometric Detection of Biodiesel/Diesel Blend Adulterations with Soybean Oil

David D. S. Fernandes; Adriano A. Gomes; Marcelo M. de Fontes; Gean B. da Costa; Valber E. de Almeida; Mario C. U. de Araújo; Roberto K. H. Galvão; Germano Véras

How to cite this article

 

A simple UV-Vis spectrometric method is proposed to detect adulterations of diesel/biodiesel blends with soybean oil. Suitable results were obtained by using four multivariate classifcation techniques (SIMCA, KNN, PLS-DA and SPA-LDA).

http://dx.doi.org/10.5935/0103-5053.20130259

Published online: November 1, 2013


J. Braz. Chem. Soc. 2014, 25(1), 176-181

A New Validation Criterion for Guiding the Selection of Variables by the Successive Projections Algorithm in Classification Problems

Sófacles F. C. Soares; Roberto K. H. Galvão; Márcio J. C. Pontes; Mário C. U. Araújo

How to cite this article

 

A new criterion is proposed to guide the selection of variables for linear discriminant analysis (LDA) in the successive projections algorithm (SPA). The advantages of the proposed approach are demonstrated in three classification problems.

http://dx.doi.org/10.5935/0103-5053.20130262

Published online: November 6, 2013

Additions and Corrections J. Braz. Chem. Soc. 2014, 25(1), 182

Refining of Buriti Oil (Mauritia flexuosa) Originated from the Brazilian Cerrado: Physicochemical, Thermal-Oxidative and Nutritional Implications

Jailane de Souza Aquino; Débora C. N. de Pontes Pessoa; Kassandra de Lourdes G. V. Araújo; Poliana S. Epaminondas; Alexandre Ricardo P. Schuler; Antônio G. de Souza; Tânia Lúcia M. Stamford

How to cite this article

 

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