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Current Issue vol. 26, No. 8, 2015, p. 1533-1741

 

Luteinizing hormone (LH) can be used by athletes to take illicit advantage in sport activities, therefore it is analyzed in anti-doping control by immunoassay. Since LH is an endogenous substance, the urinary excretion profile of the hormone in Brazilian male athletes was established in order to allow the inference of a possible abuse in sports. Details are presented in the Article Urinary Excretion Profile of Luteinizing Hormone in Brazilian Athletes by Patrícia D. O. Sardela, Vinícius F. Sardela, Henrique M. G. Pereira and Francisco R. Aquino Neto on page 1599.


Cover Article
J. Braz. Chem. Soc. 2015, 26(8), 1599-1607

Urinary Excretion Profile of Luteinizing Hormone in Brazilian Athletes

Patrícia D. O. Sardela; Vinícius F. Sardela; Henrique M. G. Pereira; Francisco R. Aquino Neto

How to cite this article

Luteinizing hormone (LH) can be used by athletes to take illicit advantage in sport activities, therefore it is analyzed in anti-doping control by immunoassay. Since LH is an endogenous substance, the urinary excretion profile of the hormone in Brazilian male athletes was established in order to allow the inference of a possible abuse in sports. Details are presented in the Article Urinary Excretion Profile of Luteinizing Hormone in Brazilian Athletes by Patrícia D. O. Sardela, Vinícius F. Sardela, Henrique M. G. Pereira and Francisco R. Aquino Neto on page 1599.

http://dx.doi.org/10.5935/0103-5053.20150130

Published online: May 19, 2015
Communication J. Braz. Chem. Soc. 2015, 26(8), 1533-1541

Synthesis of 4-Arylselanylpyrazoles Through Cyclocondensation Reaction Using Glycerol as Solvent

José E. R. Nascimento; Daniela H. de Oliveira; Paola B. Abib; Diego Alves; Gelson Perin; Raquel G. Jacob

How to cite this article

 

We describe here a simple method to synthesize 4-arylselanylpyrazoles by reaction of α-arylselanyl-1,3-diketones with arylhydrazines using glycerol as solvent at 60 °C under N2 atmosphere. This is a direct cyclocondensation reaction performed with α-arylselanyl-1,3-diketones and arylhydrazines bearing electron-withdrawing and electron-donating groups affording the corresponding 4-arylselanylpyrazoles in moderate to good yields.

http://dx.doi.org/10.5935/0103-5053.20150127

Published online: May 15, 2015

Articles J. Braz. Chem. Soc. 2015, 26(8), 1542-1550

Metal-Modified Mesoporous Silicate (MCM-41) Material: Preparation, Characterization and Applications as an Adsorbent

Alejandra S. Diez; Mariana Alvarez; Maria A. Volpe

How to cite this article

 

The preparation of pure and Metal-MCM-41 was carried out in water/surfactant/silicate mixtures. The presence of acidic sites favoured the phenol adsorption over Al-MCM-41 at low pH.

http://dx.doi.org/10.5935/0103-5053.20150122

Published online: May 15, 2015
J. Braz. Chem. Soc. 2015, 26(8), 1551-1564

Selective Hydrogenolysis of Glycerol to 1,2-Propanediol Over Bimetallic Cu-Ni Catalysts Supported on γ-Al2O3

Satyanarayana M. Pudi; Prakash Biswas; Shashi Kumar; Biswajit Sarkar

How to cite this article

 

Cu-Ni(1:1)/γ-Al2O3 catalyst exhibited a maximum glycerol conversion of 71.6% with 92.8% selectivity to 1,2-propanediol at 210 °C and 4.5 MPa hydrogen pressure. The superior performance was attributed to the strong interaction between Cu and Ni, small particle size, and high acidic strength of the catalyst.

http://dx.doi.org/10.5935/0103-5053.20150123

Published online: May 15, 2015
J. Braz. Chem. Soc. 2015, 26(8), 1565-1572

New Terpenoids from Croton limae (Euphorbiaceae)

Antonio H. Sousa; José N. Silva Junior; Maria L. S. Guedes; Raimundo Braz-Filho; Letícia V. Costa-Lotufo; Ana J. Araújo; Edilberto R. Silveira; Mary A. S. Lima

How to cite this article

 

An asymmetrical dimer of a kaurane diterpene and monoterpene and four novel diterpenes were isolated from the roots of Croton limae along with other known compounds. The kaurane diterpene exhibited cytotoxic activity against HCT-116, OVCAR-8 and SF-295 cancer cell lines.

http://dx.doi.org/10.5935/0103-5053.20150124

Published online: May 15, 2015

J. Braz. Chem. Soc. 2015, 26(8), 1573-1582

A Fast Chromatographic Method for Determination of Daidzein and Genistein in Spiked Water River Samples Using Multivariate Curve Resolution

Edilene D. T. Moreira; Licarion Pinto; Adriano A. Gomes; Héctor C. Goicoechea; Mário C. U. Araújo

How to cite this article

 

Simultaneous quantitation of daidzein and genistein in river water samples using high performance liquid chromatography-diode array detection (HPLC-DAD) and extend multivariate curve resolution-alternative least square (MCR-ALS) calibration.

http://dx.doi.org/10.5935/0103-5053.20150125

Published online: May 15, 2015
J. Braz. Chem. Soc. 2015, 26(8), 1583-1590

Maleic Anhydride as a Compatibilizer and Plasticizer in TPS/PLA Blends

Samuel H. Clasen; Carmen M. O. Müller; Alfredo T. N. Pires

How to cite this article

 

Immiscible thermoplastic starch/poly(lactic acid) grafted with maleic anhydride (TPS/PLA-g-MA) blend and in detail the hydrogen bond between the TPS matrix and PLA-g-MA domains, due to the use of MA as a compatibilizer.

http://dx.doi.org/10.5935/0103-5053.20150126

Published online: May 15, 2015
J. Braz. Chem. Soc. 2015, 26(8), 1591-1598

Palladium Nanoparticles Supported on Poly(N-vinylpyrrolidone)-Grafted Silica as an Efficient Catalyst for Copper-Free Sonogashira and Suzuki Cross-Coupling Reactions

Bahman Tamami; Fatemeh Farjadian; Soheila Ghasemi; Hamed Allahyari; Motahareh Mirzadeh

How to cite this article

 

Palladium nanoparticles supported on polyvinylpyrrolidone grafted silica was prepared. The catalyst exhibited excellent activity in Sonogashira and Suzuki coupling reactions.

http://dx.doi.org/10.5935/0103-5053.20150129

Published online: May 19, 2015

J. Braz. Chem. Soc. 2015, 26(8), 1599-1607

Urinary Excretion Profile of Luteinizing Hormone in Brazilian Athletes

Patrícia D. O. Sardela; Vinícius F. Sardela; Henrique M. G. Pereira; Francisco R. Aquino Neto

How to cite this article

 

Luteinizing hormone (LH) is included on the World Anti-Doping Agency prohibited list. Since LH is an endogenous substance, it is necessary the establishment of the urinary excretion profile of the hormone in Brazilian athletes in order to allow the inference of a possible abuse in sports.

http://dx.doi.org/10.5935/0103-5053.20150130

Published online: May 19, 2015
J. Braz. Chem. Soc. 2015, 26(8), 1608-1616

Surface Modification and Spectroscopic Characterization of TiO2 Nanoparticles with 2-Aminoethyl Dihydrogen Phosphate

Effat Iravani; Sareh A. Allahyari; Zahra Shojaei; Meisam Torab-Mostaedi

How to cite this article

 

Amino functionalization of nano TiO2 particles with monoester phosphate through strong covalent interactions.

http://dx.doi.org/10.5935/0103-5053.20150131

Published online: May 22, 2015

J. Braz. Chem. Soc. 2015, 26(8), 1617-1624

Chromatographic and Calculation Methods for Analysis of the Lipophilicity of Newly Synthesized Thiosemicarbazides and their Cyclic Analogues 1,2,4-Triazol-3-thiones

Anna M. Hawrył; Łukasz P. Popiołek; Mirosław A. Hawrył; Ryszard S. Świeboda; Milena A. Niejedli

How to cite this article

 

The newly synthesized thiosemicarbazide derivatives were analyzed by reversed phase high performance liquid chromatography (RP-HPLC) and reversed phase thin layer chromatography (RP-TLC) methods. The log PHPLC and log PTLC parameters were determined based on the Organisation for Economic Co-operation and Development (OECD) guidelines.

http://dx.doi.org/10.5935/0103-5053.20150132

Published online: May 22, 2015
J. Braz. Chem. Soc. 2015, 26(8), 1625-1631

Synthesis of Triacetin and Evaluation on Motor

Claudia V. Lacerda; Maria J. S. Carvalho; Alice R. Ratton; Itânia P. Soares; Luiz E. P. Borges

How to cite this article

 

The use of triacetin, produced from glycerol and acetic acid, as an additive for diesel oil and biodiesel contributes to a reduction in the emission of pollutants into the atmosphere, as shown by the results of a test engine experiment.

http://dx.doi.org/10.5935/0103-5053.20150133

Published online: May 22, 2015
J. Braz. Chem. Soc. 2015, 26(8), 1632-1641

Non-Enzymatic Amperometric Determination of Glucose by CuO Nanobelt Graphene Composite Modified Glassy Carbon Electrode

Sreeramareddygari Muralikrishna; Kempahanumakkagari Sureshkumar; Zhou Yan; Carlos Fernandez; Thippeswamy Ramakrishnappa

How to cite this article

 

One pot synthesis of CuO nanobelt decorated graphene oxide (GO) as well as conversion to CuO nanobelt decorated reduced GO (rGO) and used for electrochemical sensing of glucose has been reported.

http://dx.doi.org/10.5935/0103-5053.20150134

Published online: May 26, 2015

J. Braz. Chem. Soc. 2015, 26(8), 1642-1647

Separation and Preconcentration of Trace Amounts of Lead from Water Samples Using Solvent-Assisted Dispersive Solid Phase Extraction

Reyhaneh Rahnama; Raofeh Ghadiri

How to cite this article

 

This paper describes a new approach for the preconcentration of lead by solvent-assisted dispersive solid phase extraction (SADSPE) from water samples prior to analyzing by flame atomic absorption spectrometry (FAAS).

http://dx.doi.org/10.5935/0103-5053.20150136

Published online: May 26, 2015
J. Braz. Chem. Soc. 2015, 26(8), 1648-1655

Spurious Phosphorus Pyramidalization Induced by Some DFT Functionals

Carina F. Pupim; Nelson H. Morgon; Alejandro Lopez-Castillo

How to cite this article

 

The observed pyramidalization of phosphorus atoms in resonance structures is due to a spurious error introduced by some density functional theory (DFT) functionals. The optimized geometries of boron and phosphorus (BP-systems), as calculated using electron correlation (e.g., MP2 and CC), exhibit D3h symmetry (i.e., a flat molecular structure). However, C1 symmetry can instead be obtained when employing certain exchange-correlation (XC) functionals.

http://dx.doi.org/10.5935/0103-5053.20150138

Published online: May 26, 2015

J. Braz. Chem. Soc. 2015, 26(8), 1656-1663

The Inhibition of Sodium Oleate for Pitting Corrosion of Aluminum Alloy 2024 in 0.1 mol L-1 NaCl Solution

Yu Zuo; Shiwen Wang; Yuming Tang; Yong Zhou

How to cite this article

 

Sodium oleate suppressed the tendency of pitting initiation and reduced the pitting corrosion sensitivity of Al alloy 2024 in 0.1 mol L-1 NaCl solution. The C17H33COO groups adsorbed on the surface of Al alloy by chemical adsorption effect, which promoted oxidation of the Al alloy surface.

http://dx.doi.org/10.5935/0103-5053.20150139

Published online: May 29, 2015
J. Braz. Chem. Soc. 2015, 26(8), 1664-1673

Characterization and Distribution of Pyrogenic Carbon in a Fraction of Archaeological Black Earth from Caxiuanã

Milena Carvalho Moraes; Vanda Porpino Lemos; Dorsan Santos Moraes; Cláudio Nery Lamarão

How to cite this article

 

The study of pyrogenic carbon (PyC) in the archaeological black earth (ABE) profile was based on the O/C atomic ratio, determined by scanning electron microscopy combined with energy dispersive spectroscopy (SEM/EDS).

http://dx.doi.org/10.5935/0103-5053.20150140

Published online: May 29, 2015
J. Braz. Chem. Soc. 2015, 26(8), 1674-1683

Simultaneous Determination of Environmental Contaminants with Different Volatilities in Tap Water Samples Using a New Approach to Single-Drop Microextraction Procedure

Josias Merib; Adriana N. Dias; Vanessa Simão; Eduardo Carasek

How to cite this article

 

Tap water samples were submitted to a new microextraction mode for the single-drop microextraction (SDME) procedure. This new approach was applied for the determination of compounds with huge differences in their volatilities in a single assay, with good extraction efficiency.

http://dx.doi.org/10.5935/0103-5053.20150141

Published online: May 29, 2015
J. Braz. Chem. Soc. 2015, 26(8), 1684-1691

Simultaneous Determination of Catecholamines and Metanephrines in Urine by Liquid Chromatography Electrospray Ionization Tandem Mass Spectrometry: Successful Clinical Application

Maria E. R. Diniz; Leandro S. Vilhena; Breno P. Paulo; Tatiana C. C. Barbosa; Elvis C. Mateo

How to cite this article

 

In this study diphenylboronate was used in basic pH for complexation of analytes, subsequent liquid-liquid extraction with ethyl acetate and its simultaneous analysis by liquid chromatography tandem mass spectrometry (LC-MS/MS).

http://dx.doi.org/10.5935/0103-5053.20150142

Published online: June 3, 2015

J. Braz. Chem. Soc. 2015, 26(8), 1692-1701

Bulk Atmospheric Deposition of Major Ions and Dissolved Organic Nitrogen in the Lower Course of a Tropical River Basin, Southern Bahia, Brazil

Taiana G. Araujo; Marcelo F. L. Souza; William Z. de Mello; Daniela M. L. da Silva

How to cite this article

 

The atmospheric role in the biogeochemical cycles: atmospheric deposition as an important pathway of nutrients and other compounds to aquatic ecosystems.

http://dx.doi.org/10.5935/0103-5053.20150143

Published online: June 3, 2015

J. Braz. Chem. Soc. 2015, 26(8), 1702-1709

A Computational Protein Structure Refinement of the Yeast Acetohydroxyacid Synthase

Jéssica C. M. Ierich; Guedmiller S. Oliveira; Ana C. A. Vig; Adriano M. Amarante; Eduardo F. Franca; Fábio L. Leite; Yvonne P. Mascarenhas

How to cite this article

 

A full atomic description of the yeast acetohydroxyacid synthase (AHAS) was obtained by applying computational modeling protocols and molecular dynamics techniques. The refined model proposed will be useful for biosensor developing and other theoretical/experimental studies.

http://dx.doi.org/10.5935/0103-5053.20150144

Published online: June 3, 2015
J. Braz. Chem. Soc. 2015, 26(8), 1710-1717

CuO Nanofibers Immobilized on Paraffin-Impregnated Graphite Electrode and its Application in the Amperometric Detection of Glucose

Ícaro A. Simon; Natália G. Medeiros; Ketlin C. Garcia; Rosane M. D. Soares; Aline T. Rosa; Jacqueline A. Silva

How to cite this article

 

Copper oxide nanofibers synthesized by electrospinning technique and subsequent thermal treatment, were used to modify paraffin-impregnated graphite electrode for a sensitive non-enzymatic glucose detection.

http://dx.doi.org/10.5935/0103-5053.20150145

Published online: June 9, 2015
J. Braz. Chem. Soc. 2015, 26(8), 1718-1724

Influence of the Lipid Phase Removal on the Quantification of Cu, Fe and Zn Bound to Proteins from Golden Flaxseed (Linum usitatissimum L.)

Deyse de Brito Marthe; Rodinei Augusti; Letícia Malta Costa

How to cite this article

 

Organic solvents were used to remove lipid phase in the golden flaxseed samples previously to the analyses of Cu, Fe and Zn bound to proteins.

http://dx.doi.org/10.5935/0103-5053.20150146

Published online: June 9, 2015
Short Report J. Braz. Chem. Soc. 2015, 26(8), 1725-1729

Dinor Casearin X, a New Cytotoxic Clerodane Diterpene from Casearia sylvestris

Diego D. Bou; Augusto L. dos Santos; Carlos R. Figueiredo; Camyla F. Farias; Alisson L. Matsuo; Rodrigo O. S. Kitamura; Leila Gimenes; João H. G. Lago; Patricia Sartorelli

How to cite this article

 

This paper describes the isolation and chemical characterization of a new clerodane-type diterpene, named dinor casearin X, from leaves of Casearia sylvestris, which exhibited cytotoxic activity against HL-60 cells (IC50 0.51 ± 0.11 mg mL-1). Additionally, the four known casearins A, B, G and J were also identified.

http://dx.doi.org/10.5935/0103-5053.20150128

Published online: May 19, 2015

J. Braz. Chem. Soc. 2015, 26(8), 1730-1736

Multivariate Analysis of Perfumes by Ultraviolet Spectrophotometry

Clêrton L. Gomes; Ari Clecius A. Lima; Manuela C. L. Cândido; Abel. B. R. Silva; Adonay R. Loiola; Ronaldo F. Nascimento

How to cite this article

 

A method for detecting adulteration in perfumes by ultraviolet (UV) spectroscopy and multivariate analysis is proposed. Classification of perfumes was accomplished with spectroscopic data using chemometrics analysis techniques such as principal component analysis (PCA), soft independent modeling of class analogy (SIMCA) and linear discriminant analysis (LDA).

http://dx.doi.org/10.5935/0103-5053.20150135

Published online: May 26, 2015

J. Braz. Chem. Soc. 2015, 26(8), 1737-1741

Prediction of Phase Separation Using a Modified Regular Solution Theory and the SMD Continuum Solvation Model

Josefredo R. Pliego Jr.

How to cite this article

 

A new definition of β and fast prediction of phase separation.

http://dx.doi.org/10.5935/0103-5053.20150137

Published online: May 26, 2015

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