JBCS

5:24, Thu Jul 24

Most Highly Cited Articles
(1995-2012)

Web of ScienceTM Core Collection
June/2014


1. Transesterification of vegetable oils: a review
Schuchardt, U; Sercheli, R; Vargas, RM; 9 (3), 199-210   1998

Times Cited: 469


2. On the solid, liquid and solution structural organization of imidazolium ionic liquids
Dupont, J; 15 (3), 341-350     2004

Times Cited: 419


3. The chemistry of isatins: a review from 1975to 1999
da Silva, JFM; Garden, SJ; Pinto, AC; 12 (3), 273-U86 2001  

Times Cited: 383


4. Biodiesel: An overview
Pinto, AC; Guarieiro, LLN; Rezende, MJC, et al., 16 (6B), 1313-1330 2005

Times Cited: 326


5. Chiral Lewis acid catalysts in Diels-Alder cycloadditions: Mechanistic aspects and synthetic applications of recent systems
Dias, LC; 8 (4), 289-332 1997

Times Cited: 173


6. Room temperature molten salts: Neoteric "green" solvents for chemical reactions and processes
Dupont, J; Consorti, CS; Spencer, J ; 11 (4), 337-344 2000

Times Cited: 154


7. Laser induced breakdown spectroscopy
Pasquini, C; Cortez, J; Silva, LMC; et al.; 18 (3) 463-512 2007

Times Cited: 134


8. Near infrared spectroscopy: Fundamentals, practical aspects and analytical applications
Pasquini, C; 14 (2) 198-219 2003

Times Cited: 133


9. Adsorption of anionic dyes on the biopolymer chitin
Longhinotti, E; Pozza, F; Furlan, L; et al.; 9 (5) 435-440 1998

Times Cited: 94


10. Traditional uses, chemistry and pharmacology of Croton species (Euphorbiaceae)
Salatino, Antonio; Salatino, Maria L. Faria; Negri, Giuseppina; 18 (1) 17-33 2007

Times Cited: 91


Current Issue vol. 25, No. 7, 2014, p. 1151-1316

 

Looking Forward to Improving Gender Equality in Science

In 1792, Mary Wollstonecraft wrote in A Vindication of the Rights of Woman: "My observations on national education are obviously hints; but I principally wish to enforce the necessity of educating the sexes together to perfect both".1
In 2014, we are witnessing a critical and unacceptable situation in Nigeria caused by the obscurantism and blindness of the Boko Haram and by a country that seems not prepared to deal with gender equality.
However, the situation of the woman's rights is even worse because, even in modern European Community, according to a recent report by Serena Kutchinsky: "data compiled by the EU Agency for Fundamental Rights (FRA), who interviewed 42,000 women from 28 member states, it revealed that one in three women has been either physically or sexually abused".2 Surprisingly, "countries with the highest levels of gender equality reported the highest levels of gender violence. The supposedly liberal Nordic nations came out the worst with Denmark (52%), Finland (47%) and Sweden (46%). The UK fared little better coming in fifth".2

(Read more at Editorial)


Cover Article
J. Braz. Chem. Soc. 2014, 25(7), 1172-1177

Ambient Mass Spectrometry Employed for Direct Analysis of Intact Arabica Coffee Beans

Rafael Garrett; Nicolas V. Schwab; Elaine C. Cabral; Brenno V. M. Henrique; Demian R. Ifa; Marcos N. Eberlin; Claudia M. Rezende

How to cite this article

Brazilian coffee has reached the level of global high quality coffees, due to scientific studies and advanced agricultural technologies. In this paper, techniques of surface analysis by mass spectrometry (DESI-MS and EASI-MS) in the investigation of green beans Arabica coffees were employed in order to know in detail the constituents of the wax beans, and assess the potential of these techniques in differentiation of post-harvest treatments via multivariate statistics. Details are presented in the Article Ambient Mass Spectrometry Employed for Direct Analysis of Intact Arabica Coffee Beans by Rafael Garrett, Nicolas V. Schwab, Elaine C. Cabral, Brenno V. M. Henrique, Demian R. Ifa, Marcos N. Eberlin and Claudia M. Rezende on page 1172.

http://dx.doi.org/10.5935/0103-5053.20140094

Published online: April 29, 2014
Editorial J. Braz. Chem. Soc. 2014, 25(7), 1151-1152

Looking Forward to Improving Gender Equality in Science

Solange Cadore; Joaquim A. Nóbrega

How to cite this article

 

http://dx.doi.org/10.5935/0103-5053.20140150

Articles J. Braz. Chem. Soc. 2014, 25(7), 1153-1160

Efficient Photoelectrochemical Reduction of Nitrite to Ammonium and Nitrogen Containing Gaseous Species Using Ti/TiO2 Nanotube Electrodes

Fabiana A. Sayão; Luciana Nuñez; Maria V. B. Zanoni

How to cite this article

 

Photoelectrocatalytic reduction of nitrite reached 100% and its conversion involves formation of ammonium ion and nitrogen containing gaseous species by using a two compartment reactor and absence of dissolved oxygen. The procedure is based on UV irradiation of Ti/TiO2 semiconductor biased with more negative potential than their flat band potential.

http://dx.doi.org/10.5935/0103-5053.20140091

Published online: April 29, 2014
J. Braz. Chem. Soc. 2014, 25(7), 1161-1165

Evaluation of ASTM D6584 Method for Biodiesel Ethyl Esters from Sunflower Oil and Soybean/Tallow Mixture and for Biodiesel Methyl Esters from Tung Oil and Soybean/Tung Mixture

Adriana Neves Dias; Márcia Helena Scherer Kurz; Cássia Alessandra Maciel Fagundes; Sergiane Souza Caldas; Rosilene Maria Clementin; Marcelo Gonçalves Montes D'Oca; Ednei Gilberto Primel

How to cite this article

 

Glycerol and glycerides were determined in samples of biodiesel ethyl esters from soybean/tallow mixture and sunflower and biodiesel methyl esters from soybean/tung mixture and tung oil by employing ASTM D6584 method.

http://dx.doi.org/10.5935/0103-5053.20140092

Published online: April 29, 2014
J. Braz. Chem. Soc. 2014, 25(7), 1166-1171

Matrix Solid-Phase Dispersion versus Ultrasound Assisted Extraction with Solid‑Phase Extraction in the HPLC Analysis of Furanocoumarins from Fruits of Archangelica officinalis Hoffm.

Anna Oniszczuk; Krystyna Skalicka-Woźniak; Tomasz Oniszczuk; Monika Waksmundzka-Hajnos; Kaziemirz Głowniak

How to cite this article

 

A schematic representation of the matrix solid-phase dispersion (MSPD) of furanocoumarins.

http://dx.doi.org/10.5935/0103-5053.20140093

Published online: April 29, 2014
J. Braz. Chem. Soc. 2014, 25(7), 1172-1177

Ambient Mass Spectrometry Employed for Direct Analysis of Intact Arabica Coffee Beans

Rafael Garrett; Nicolas V. Schwab; Elaine C. Cabral; Brenno V. M. Henrique; Demian R. Ifa; Marcos N. Eberlin; Claudia M. Rezende

How to cite this article

 

The ambient ionization mass spectrometry techniques DESI and EASI were employed to directly analyze intact beans of Arabica coffees processed by the dry, semi-dry and wet post-harvest treatments.

http://dx.doi.org/10.5935/0103-5053.20140094

Published online: April 29, 2014

J. Braz. Chem. Soc. 2014, 25(7), 1178-1193

Efficient One Pot Synthesis of Xanthene-Triazole-Quinoline/Phenyl Conjugates and Evaluation of their Antimicrobial Activity

Harjinder Singh; Bhaskara Nand; Jayant Sindhu; Jitender M. Khurana; Chetan Sharma; Kamal R. Aneja

How to cite this article

 

Compound in the right showed best antibacterial and antifungal activity with MIC of 16 µg mL-1 against bacteria Staphylococcus aureus, Bacillus subtilis and also against fungus Aspergillus niger.

http://dx.doi.org/10.5935/0103-5053.20140095

Published online: May 6, 2014

J. Braz. Chem. Soc. 2014, 25(7), 1194-1199

A Simple and Efficient Method for Derivatization of Glyphosate and AMPA Using 9-Fluorenylmethyl Chloroformate and Spectrophotometric Analysis

Tereza C. P. G. Catrinck; Amanda Dias; Maria Clara S. Aguiar; Flaviano O. Silvério; Paulo H. Fidêncio; Gevany P. Pinho

How to cite this article

 

A simple and fast derivatization method for analysis of glyphosate and aminomethylphosphonic acid (AMPA) using UV spectrophotometry.

http://dx.doi.org/10.5935/0103-5053.20140096

Published online: May 6, 2014
J. Braz. Chem. Soc. 2014, 25(7), 1200-1207

Synthesis and Antioxidant Activity of 1,4-[Bis(3-arylmethanesulfonyl pyrrolyl and pyrazolyl)]benzenes

Gopala Lavanya; Venkatapuram Padmavathi; Adivireddy Padmaja

How to cite this article

 

A variety of (1,4-phenylene)bis(arylmethanesulfonylpyrroles and pyrazoles) were prepared by the cycloaddition of 1,3-dipolar reagents, tosylmethyl isocyanide and diazomethane to the Michael acceptor 1,4-bis(E)-2-((arylmethanesulfonyl)vinyl)benzene and evaluated for antioxidant activity. Amongst the tested compounds 5d displayed excellent radical scavenging activity in all the three methods evaluated when compared with the standard ascorbic acid.

http://dx.doi.org/10.5935/0103-5053.20140097

Published online: May 6, 2014

J. Braz. Chem. Soc. 2014, 25(7), 1208-1217

Complex Electrooxidation of Formic Acid on Palladium

Andressa Mota-Lima; Ernesto R. Gonzalez; Markus Eiswirth

How to cite this article

 

Formic Acid (FA) oscillating mechanism is stressed in the network diagram; competition of COads and OHads by the same free site (*) forms, each one, a loop over the free sites, while direct FA electro-oxidation forms a loop with high turnover rate. Subsurface hydrogen accelerates the direct FA electroxidation and slows down CO adsorption on Palladium.

http://dx.doi.org/10.5935/0103-5053.20140098

Published online: May 6, 2014
J. Braz. Chem. Soc. 2014, 25(7), 1218-1225

Improving the Mechanical Properties of Polyamide 6-Nanosilica Nanocomposites by Combining Masterbatch Technique with in situ Polymerization

Qijie Xu; Xiaohong Li; Fangfei Chen; Zhijun Zhang

How to cite this article

 

A reactive polyamide 6 (PA6)/SiO2 masterbatch containing 20% (mass fraction) of nano-SiO2 was used as a filler to prepare polyamide 6/SiO2 nanocomposites. The as-prepared nanocomposites with 0.5% nano-SiO2 content presented the best mechanical properties.

http://dx.doi.org/10.5935/0103-5053.20140099

Published online: May 13, 2014
J. Braz. Chem. Soc. 2014, 25(7), 1226-1236

Degradation of Phenylethylamine and Tyramine by Gamma Radiation Process and Docking Studies of its Radiolytes

Monique Cardozo; Stefânia Priscila de Souza; Keila dos Santos Cople Lima; Aline Alves Oliveira; Cláudia Moraes Rezende; Tanos Celmar Costa França; Antonio Luis dos Santos Lima

How to cite this article

 

Degradation products of methanolic and aqueous solutions of phenylethylamine (left) and tyramine (right) by gamma radiation at 5kGy.

http://dx.doi.org/10.5935/0103-5053.20140100

Published online: May 13, 2014

J. Braz. Chem. Soc. 2014, 25(7), 1237-1245

Antioxidant Capacity in Tilapia Fillets Enriched with Extract of Acerola Fruit Residue

Fabiana Carbonera; Paula F. Montanher; Sylvio V. Palombini; Swami A. Maruyama; Thiago Claus; Hevelyse M. C. Santos; Sheisa C. Sargi; Makoto Matsushita; Jesuí V. Visentainer

How to cite this article

 

In the present study, the antioxidant capacity, using different methodologies, and the fatty acid composition of tilapia fillets supplemented with extract of acerola fruit residue were evaluated.

http://dx.doi.org/10.5935/0103-5053.20140101

Published online: May 13, 2014
J. Braz. Chem. Soc. 2014, 25(7), 1246-1252

A New Spectrophotometric Method for Determining the Enzymatic Activity of endo-β-mannanase in Seeds

Gevany P. Pinho; Juliana R. M. Matoso; Flaviano O. Silvério; Welha C. Mota; Paulo Sérgio N. Lopes; Leonardo M. Ribeiro

How to cite this article

 

A new spectrophotometric method was developed to determine the enzymatic activity of endo-β-mannanase. A key advantage of the method is that it can be performed with only 5 mg of germinating seeds and hence different parts of the seed can be quickly and efficiently assessed.

http://dx.doi.org/10.5935/0103-5053.20140102

Published online: May 16, 2014
J. Braz. Chem. Soc. 2014, 25(7), 1253-1260

Efficient Synthesis of Novel Pyranoquinoline Derivatives from Simple Acetanilide Derivatives: Experimental and Theoretical Study of their Physicochemical Properties using DFT Calculations

Zohreh Mirjafary; Hamid Saidian; Morteza Sahandi; Leila Shojaei

How to cite this article

 

An efficient process for synthesis of pyranoquinolines via Knoevenagel condensation then the ring closures through an addition-elimination reaction of readily available 2-chloroquinoline-3-carbaldehydes with dimedone was reported. On the other hand, NICS values were used as quantitative measures for the relative aromatic character in pyranoquinolines. The results show that NICS for phenyl group of pyranoquinolines are less than that for benzene.

http://dx.doi.org/10.5935/0103-5053.20140103

Published online: May 16, 2014

J. Braz. Chem. Soc. 2014, 25(7), 1261-1269

Glycerol/Hypophosphorous Acid and PhSeSePh: An Efficient and Selective System for Reactions in the Carbon-Carbon Double Bond of (E)-Chalcones

Katiúcia D. Mesquita; Bianca Waskow; Ricardo F. Schumacher; Gelson Perin; Raquel G. Jacob; Diego Alves

How to cite this article

 

Reaction of in situ generated benzeneselenol with various (E)-chalcones using glycerol as solvent, gave β-selanylcarbonyl compound or chemoselective 1,4-reduction products, depending on the amount of benzeneselenol employed and the nature of (E)-chalcone. The glycerol/H3PO2 system can be easily recovered and reused in chemoselective 1,4-reductions and the natural product zingerone can be synthesized in good yield.

http://dx.doi.org/10.5935/0103-5053.20140104

Published online: May 16, 2014

J. Braz. Chem. Soc. 2014, 25(7), 1270-1274

Influence of Cold Deformation on Pitting Corrosion Resistance of ISO NBR 5832-1 Austenitic Stainless Steel Used for Orthopedic Implants

Alexander H. Ramirez; Cristiaann H. Ramirez; Isolda Costa

How to cite this article

 

Potentiodynamic polarization curves of the ISO NBR 5832-1 stainless steel with cold deformation (50% reduction in thickness) or without deformation (0%) showing that the cold deformation increased pitting susceptibility of the stainless steel.

http://dx.doi.org/10.5935/0103-5053.20140105

Published online: May 16, 2014
J. Braz. Chem. Soc. 2014, 25(7), 1275-1282

Side-Chain Liquid-Crystalline Polymer Tetrazoles: Synthesis and Characterization

Muhammad Tariq; Shahid Hameed; Rachel F. Magnago; Ivan H. Bechtold; Aloir A. Merlo

How to cite this article

 

Structure of smectic C (SmC) mesophase determined by X-ray analysis of polymer tetrazoles poly-{4-(2-nonyl-2H-tetrazol-5-yl)phenyl 4-[(propionyloxy)butyloxy)]}benzoate (left) and poly-{4-(2-nonyl-2H-tetrazol-5-yl)phenyl 4-[(propionyloxy)undecyloxy)]}benzoate (right).

http://dx.doi.org/10.5935/0103-5053.20140107

Published online: May 20, 2014

J. Braz. Chem. Soc. 2014, 25(7), 1283-1291

Monitoring of Diclofenac with Biomimetic Sensor in Batch and FIA Systems

Ademar Wong; Luiz D. Marestoni; Maria D. P. T. Sotomayor

How to cite this article

 

Modification of glassy carbon electrode with MWCNT-COOH and copper phthalocyanine complex, which is responsible for imitating the active site of the P450 enzyme, iron protoporphyrin IX.

http://dx.doi.org/10.5935/0103-5053.20140108

Published online: May 20, 2014

J. Braz. Chem. Soc. 2014, 25(7), 1292-1301

Determination of Chlorobenzenes in Sewage Sludge by Solid-Liquid Extraction with Purification at Low Temperature and Gas Chromatography Mass Spectrometry

Gevany P. Pinho; Flaviano O. Silvério; Gabriela F. Evangelista; Laila V. Mesquita; Érica S. Barbosa

How to cite this article

 

The technique of solid-liquid extraction with purification at low temperature was used in the monitoring of sewage sludge samples collected within the period of 11 months. The 1,2,3-trichlorobenzene was quantified in concentrations higher than the maximum residue limit for chlorobenzene in soil amended with sludge.

http://dx.doi.org/10.5935/0103-5053.20140109

Published online: May 20, 2014
J. Braz. Chem. Soc. 2014, 25(7), 1302-1310

The Influence of Salinity and Matrix Effect in the Determination of Antifouling Biocides in Estuarine Waters of Patos Lagoon (Southern Brazil)

Luís A. E. Dominguez; Sergiane S. Caldas; Ednei G. Primel; Gilberto Fillmann

How to cite this article

 

An analytical method was optimized and applied to analyze the antifouling biocides irgarol and diuron in estuarine and coastal waters under the influence of Rio Grande harbors. The concentrations were lower (< 1.3 to 21 ng L-1) than those capable of causing harm to the aquatic biota.

http://dx.doi.org/10.5935/0103-5053.20140110

Published online: May 23, 2014

Short Report J. Braz. Chem. Soc. 2014, 25(7), 1311-1316

Synthesis of Quinolinediones by Catalyst-Free Formal Aza-[3+2+1] Cycloaddition of Enaminones, Aldehydes and Meldrum's Acid

Silvio Cunha; Lourenço L. B. de Santanaa

How to cite this article

 

A green procedure to the domino one-pot three-component reaction was developed to the synthesis of 4-aryl-tetrahydroquinoline-2,5-diones.

http://dx.doi.org/10.5935/0103-5053.20140106

Published online: May 20, 2014

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