JBCS

3:49, Thu Mar 30

Open Access/APCs

vol. 26, No. 6, 2015, p. 1055-1312

 

The figure shows sugarcane, raw material for ethanol production, exposed to different environmental conditions in Brazilian crop areas. Composed of 70% water, this plant was the key in this work to investigate the influence of seasonal and regional variations in source water isotopic patterns and their influence on ethanol's isotopic ratios, aiming at discrimination of geographical origin. Details are presented in the Article Mapping Ethanol Production Sources in Brazil Through Stable Isotopes by Gilson C. Silva, Marcelo Z. Moreira, Arthur L. Scofield, José M. O. Godoy, Lilian F. Almeida, Angela L. R. Wagener on page 1283.


Cover Article
J. Braz. Chem. Soc. 2015, 26(6), 1283-1296

Mapping Ethanol Production Sources in Brazil Through Stable Isotopes

Gilson C. Silva; Marcelo Z. Moreira; Arthur L. Scofield; José M. O. Godoy; Lilian F. Almeida; Angela L. R. Wagener

How to cite this article

The figure shows sugarcane, raw material for ethanol production, exposed to different environmental conditions in Brazilian crop areas. Composed of 70% water, this plant was the key in this work to investigate the influence of seasonal and regional variations in source water isotopic patterns and their influence on ethanol's isotopic ratios, aiming at discrimination of geographical origin. Details are presented in the Article Mapping Ethanol Production Sources in Brazil Through Stable Isotopes by Gilson C. Silva, Marcelo Z. Moreira, Arthur L. Scofield, José M. O. Godoy, Lilian F. Almeida, Angela L. R. Wagener on page 1283.

http://dx.doi.org/10.5935/0103-5053.20150095

Published online: April 24, 2015

Review J. Braz. Chem. Soc. 2015, 26(6), 1055-1085

The Multiple Faces of Eugenol. A Versatile Starting Material and Building Block for Organic and Bio-Organic Synthesis and a Convenient Precursor Toward Bio-Based Fine Chemicals

Teodoro S. Kaufman

How to cite this article

 

Eugenol is a convenient starting material or building block for the synthesis of structurally, biologically or technologically relevant compounds and natural products, and a suitable precursor for fine chemicals synthesis.

http://dx.doi.org/10.5935/0103-5053.20150086

Published online: April 7, 2015

Articles J. Braz. Chem. Soc. 2015, 26(6), 1086-1097

Synthesis and Antitumor Evaluation of New Heterocycles Derived from 3-Methyl-2-benzothiazolinone Hydrazone

Nabila M. Ibrahim; Hisham A. A. Yosef; Ewies F. Ewies; Mohamed R. H. Mahran; Mamdouh M. Ali; Abeer E. Mahmoud

How to cite this article

 

3-Methyl-2-benzothiazolinone hydrazone condensed with some selected aldehydes to give the corresponding Schiff bases, which cyclize with thioglycolic acid to afford the respective thiazolidenones.

http://dx.doi.org/10.5935/0103-5053.20150071

Published online: March 24, 2015


J. Braz. Chem. Soc. 2015, 26(6), 1098-1110

Separation, Concentration and Determination of Trace Thiamphenicol in Egg, Milk and Honey Using Polyoxyethylene Lauryl Ether-Salt Aqueous Two-Phase System Coupled with High Performance Liquid Chromatography

Hui Yao; Yang Lu; Juan Han; Yun Wang; Yongsheng Yan

How to cite this article

 

The schematic diagram of separation thiamphenicol (TAP) in polyoxyethylene lauryl ether (POELE10)-(NH4)2SO4 aqueous two-phase system (ATPS).

http://dx.doi.org/10.5935/0103-5053.20150072

Published online: March 24, 2015

J. Braz. Chem. Soc. 2015, 26(6), 1111-1114

Interrelation Between the Interaction Parameter and the Width of the Adsorption Voltammetric Peak

Vladimir D. Ivanov

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A width of adsorption voltammetric peak (δ) may be a key to interactions in the adsorption layer, defined by interaction parameter G.

http://dx.doi.org/10.5935/0103-5053.20150073

Published online: March 24, 2015

J. Braz. Chem. Soc. 2015, 26(6), 1115-1123

Effect of Applied Voltage on Slow-Release of Cu(II) Ions on the Synthesis of Copper(II) Stearate Complex by Electrochemical Technique

Norazzizi Nordin; Siti Z. Hasan; Zuhailie Zakaria; Noor A. Baharuddin; Wan Z. Samad; Muhammad R. Yusop; Mohamed R. Othman

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Cu(II) stearate complex was synthesized by the slow-release of Cu2+ ion from the electrochemical oxidation of a Cu anode with stearic acid. Different values of applied voltages (1, 5 and 10 V) were used during the synthesis to study the effect of applied voltage on the particle size and morphology of the complex.

http://dx.doi.org/10.5935/0103-5053.20150074

Published online: March 27, 2015


J. Braz. Chem. Soc. 2015, 26(6), 1124-1135

Investigation of the Environmental Transport of Human Pharmaceuticals to Surface Water: A Case Study of Persistence of Pharmaceuticals in Effluent of Sewage Treatment Plants and Hospitals in Malaysia

Fouad F. Al-Qaim; Md P. Abdullah; Mohamed R. Othman; Zainab H. Mussa; Zuriati Zakaria; Jalifah Latip; Wan M. Afiq

How to cite this article

 

The liquid chromatography-time of flight/mass spectrometry (LC-TOF/MS) method was developed and validated to quantify and monitor pharmaceuticals water samples. Ten pharmaceuticals were detected in water samples (surface water, sewage treatment plants and hospital waste) by using LC-TOF/MS instrument.

http://dx.doi.org/10.5935/0103-5053.20150075

Published online: March 27, 2015


J. Braz. Chem. Soc. 2015, 26(6), 1136-1142

Structure of Humic Substances from Some Regions of the Amazon Assessed Coupling 3D Fluorescence Spectroscopy and CP/PARAFAC

Cleber H. Santos; Gustavo Nicolodelli; Renan A. Romano; Amanda M. Tadini; Paulino R. Villas-Boas; Célia R. Montes; Stephane Mounier; Débora M. B. P. Milori

How to cite this article

 

Structural changes of humic acids (HAs) extracted from Amazonian soils were studied using fluorescence emission-excitation matrix (EEM) combined with parallel factor analysis (CP/PARAFAC). This combination enabled the identification and quantification of two fluorophores associated with HAs.

http://dx.doi.org/10.5935/0103-5053.20150076

Published online: March 27, 2015

J. Braz. Chem. Soc. 2015, 26(6), 1143-1151

Recovery Process Development for the Rare Earths from Permanent Magnet Scraps Leach Liquors

Ho-Sung Yoon; Chul-Joo Kim; Kyeong W. Chung; Sung-Don Kim; Jyothi R. Kumar

How to cite this article

 

Slogan and objective of the present recovery process development for the dysprosium and neodymium separation from permanent magnets scraps leach liquors.

http://dx.doi.org/10.5935/0103-5053.20150077

Published online: March 31, 2015

J. Braz. Chem. Soc. 2015, 26(6), 1152-1159

New Alkaloids from Margaritopsis carrascoana (Rubiaceae)

Raimundo R. G. Nascimento; Antônia T. A. Pimenta; Pedro de Lima Neto; José R. C. Junior; Letícia V. Costa-Lotufo; Elthon G. Ferreira; Luzineide W. Tinoco; Raimundo Braz-Filho; Edilberto R. Silveira; Mary A. S. Lima

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Two new alkaloids were isolated from the aerial parts of Margaritopsis carrascoana, along with known calycosidine and hodgkinsine.

http://dx.doi.org/10.5935/0103-5053.20150079

Published online: March 31, 2015


J. Braz. Chem. Soc. 2015, 26(6), 1160-1170

Adsorption of Transition Metal Chlorides by Silica with Grafted 1-n-Propyl-3-Methylimidazolium Chloride

Anton V. Panteleimonov; Mykyta O. Onizhuk; Inna V. Khristenko; Iuliia I. Chuiko; Oleg S. Tkachenko; Yoshitaka Gushikem; Yuriy V. Kholin

How to cite this article

 

The model of bidentate binding was employed to describe equilibria of metal chlorides adsorption by silica with grafted 1-n-propyl-3-methylimidazolium chloride. The model takes into account the fixation of metal species as tri- and tetrachlorometallate anions detained near the surface as counterions and also the dissociation and auto-complexation equilibria of metal chlorides in solutions.

http://dx.doi.org/10.5935/0103-5053.20150080

Published online: April 7, 2015


J. Braz. Chem. Soc. 2015, 26(6), 1171-1179

Optimization of Auxiliary Solvent Demulsification Microextraction for Determination of Cyanide in Environmental Water and Biological Samples by Microvolume UV-Vis Spectrophotometry

Shahed Hassanpoor; Gholamreza Khayatian; Raouf Ghavami; Elham Safaei

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The solvent terminated-auxiliary solvent-dispersive liquid-liquid microextraction (ST-AS-DLLME) technique was combined with microvolume UV-Vis spectrophotometry avoiding centrifugation and simplifying the operation. The extraction optimization was performed based on design of experiment (DOE) methods.

http://dx.doi.org/10.5935/0103-5053.20150081

Published online: February 4, 2007


J. Braz. Chem. Soc. 2015, 26(6), 1180-1190

Synthesis of Nano-Pore Size Ag(I)-Imprinted Polymer for the Extraction and Preconcentration of Silver Ions Followed by Its Determination with Flame Atomic Absorption Spectrometry and Spectrophotometry Using Localized Surface Plasmon Resonance Peak of Silver Nanoparticles

Shayessteh Dadfarnia; Ali Mohammad Haji Shabani; Elahe Kazemi; Seyed Ahmad Heydari Khormizi; Fattema Tammadon

How to cite this article

 

An ion imprinted polymer is synthesized and applied for selective extraction of silver from different aqueous samples. The silver content is determined using the flame atomic absorption spectrometry (FAAS) and spectrophotometry based on silver localized surface plasmon resonance peak (LSPRP).

http://dx.doi.org/10.5935/0103-5053.20150082

Published online: April 7, 2015


J. Braz. Chem. Soc. 2015, 26(6), 1191-1200

TiO2 Supported on HZSM-11 Zeolite as Efficient Catalyst for the Photodegradation of Chlorobenzoic Acids

Juan P. Montañez; Silvina Gómez; Ana N. Santiago; Liliana B. Pierella

How to cite this article

 

Chlorobenzoic acids are persistent pollutants in the environment, adversely affecting the flora and fauna. In this work, the photocatalytic decomposition of 2-, 3- and 4- chlorobenzoic acids with TiO2 loaded on HZSM-11 zeolite was investigated. We report the use of zeolite-supported TiO2, which can be easily removed and is a very efficient and reusable photocatalyst.

http://dx.doi.org/10.5935/0103-5053.20150083

Published online: April 7, 2015

J. Braz. Chem. Soc. 2015, 26(6), 1201-1210

Green Synthesis of Chalcones and Microbiological Evaluation

Marina Ritter; Rosiane M. Martins; Silvana A. Rosa; Juliana L. Malavolta; Rafael G. Lund; Alex F. C. Flores; Claudio M. P. Pereira

How to cite this article

 

This work describes an efficient method for the synthesis of chalcones in glycerin and antifungal and antibacterial assays for these molecules.

http://dx.doi.org/10.5935/0103-5053.20150084

Published online: April 7, 2015


J. Braz. Chem. Soc. 2015, 26(6), 1211-1217

Evaluation of Direct Analysis for Trace Elements in Tea and Herbal Beverages by ICP-MS

Raquel F. Milani; Marcelo A. Morgano; Elisabete S. Saron; Fabio F. Silva; Solange Cadore

How to cite this article

 

A simple and fast method for Al, As, Ba, Cd, Cr, Cu, Fe, Mn, Ni, Pb, Se, and Zn determination in tea and herbal beverages using direct analysis by inductively coupled plasma mass spectrometry (ICP-MS) was developed.

http://dx.doi.org/10.5935/0103-5053.20150085

Published online: April 7, 2015

J. Braz. Chem. Soc. 2015, 26(6), 1218-1226

In silico Antibacterial Activity Modeling Based on the TOMOCOMD-CARDD Approach

Juan A. Castillo-Garit; Yovani Marrero-Ponce; Stephen J. Barigye; Ricardo Medina-Marrero; Milagros G. Bernal; José M. G. de la Vega; Francisco Torrens; Vicente J. Arán; Facundo Pérez-Giménez; Ramón García-Domenech; Rosa Acevedo-Barrios

How to cite this article

 

Antibacterial classification functions based on the topological molecular computer design-computer aided ''rational'' drug design (TOMOCOMD-CARDD) bilinear indices are presented. These models were built using the linear discriminant analysis (LDA) method over compounds dataset of 2230 molecular structures.

http://dx.doi.org/10.5935/0103-5053.20150087

Published online: April 10, 2015


J. Braz. Chem. Soc. 2015, 26(6), 1227-1231

Brazilian Federal District Cocaine Chemical Profiling - Mass Balance Approach and New Adulterant Routinely Quantified (Aminopyrine)

Adriano O. Maldaner; Élvio D. Botelho; Jorge J. Zacca; Marcos A. Camargo; Jez W. Braga; Tatiane S. Grobério

How to cite this article

 

Cocaine samples seized in Brazilian Federal District between 2010 and 2013 were analyzed by the Federal Police chemical profiling program (PeQui project). Cocaine purity, degree of oxidation and pharmaceutical products used as cutting agents were determined by gas chromatography-flame ionization detector (GC-FID) analysis. A new adulterant was identified and routinely quantified (aminopyrine) and a mass balance approach was discussed.

http://dx.doi.org/10.5935/0103-5053.20150088

Published online: April 10, 2015

J. Braz. Chem. Soc. 2015, 26(6), 1232-1246

Preliminary Investigation of Medicinal Herb Adulteration Using Comprehensive Two-Dimensional Gas Chromatography and Chemometric Analysis

Juliane E. Welke; Flaviana C. Damasceno; Karine P. Nicolli; Lilian Mentz; Elina B. Caramão; Fernando H. Pulgati; Cláudia A. Zini

How to cite this article

 

Seven compounds were appointed by chemometric analysis of two dimensional gas chromatography data as the most discriminating between anise and fennel. These compounds were used to verify the use of fennel instead of anise (as described in label) in personal care products.

http://dx.doi.org/10.5935/0103-5053.20150089

Published online: April 10, 2015


J. Braz. Chem. Soc. 2015, 26(6), 1247-1256

Synthesis, Vibrational Spectroscopic and Thermal Properties of Oxocarbon Cross-Linked Chitosan

Nelson L. G. D. Souza; Tamyres F. Salles; Humberto M. Brandão; Howell G. M. Edwards; Luiz F. C. de Oliveira

How to cite this article

 

Chitosan has been cross-linked covalently and ionically with different oxocarbons and pseudo-oxocarbons and characterised using vibrational (Raman and infrared) spectroscopy, thermogravimetry and nuclear magnetic resonance spectroscopy.

http://dx.doi.org/10.5935/0103-5053.20150090

Published online: April 10, 2015

J. Braz. Chem. Soc. 2015, 26(6), 1257-1264

1H qNMR and Chemometric Analyses of Urban Wastewater

Elenilson G. Alves Filho; Luci Sartori; Lorena M. A. Silva; Tiago Venâncio; Renato L. Carneiro; Antonio G. Ferreira

How to cite this article

 

The contributions of domestic and industrial discharges in the common wastewater system and seasonal variations were investigated by 1H nuclear magnetic resonance (NMR) coupled to multivariate statistical analysis to monitor the sewage treatment operations.

http://dx.doi.org/10.5935/0103-5053.20150091

Published online: April 17, 2015


J. Braz. Chem. Soc. 2015, 26(6), 1265-1273

Multiple Dynamics of Hydrazone Based Compounds

Elkin L. Romero; Richard F. D'Vries; Fabio Zuluaga; Manuel N. Chaur

How to cite this article

 

Hydrazones, derived from hydrazinopyridines, are compounds capable of undergoing reversible configurational changes and to coordinate metal centers exhibiting in each of those states different electronic and optical properties.

http://dx.doi.org/10.5935/0103-5053.20150092

Published online: April 17, 2015


J. Braz. Chem. Soc. 2015, 26(6), 1274-1282

Novel and Fast Microwave-Assisted Synthesis of Carbon Quantum Dots from Raw Cashew Gum

Natalia R. Pires; Clara M. W. Santos; Rayane R. Sousa; Regina C. M. de Paula; Pablyana L. R. Cunha; Judith P. A. Feitosa

How to cite this article

 

Carbon quantum dot with bright blue photoluminescence was synthesized from raw cashew gum using novel and fast microwave-assisted procedure.

http://dx.doi.org/10.5935/0103-5053.20150094

Published online: April 24, 2015

J. Braz. Chem. Soc. 2015, 26(6), 1283-1296

Mapping Ethanol Production Sources in Brazil Through Stable Isotopes

Gilson C. Silva; Marcelo Z. Moreira; Arthur L. Scofield; José M. O. Godoy; Lilian F. Almeida; Angela L. R. Wagener

How to cite this article

 

Influence of seasonal variations in water isotopic patterns on isotopic fingerprints of ethanol and correlations with sugarcane biomass.

http://dx.doi.org/10.5935/0103-5053.20150095

Published online: April 24, 2015


J. Braz. Chem. Soc. 2015, 26(6), 1297-1305

Exploratory Analysis of the Distribution of Lignin and Cellulose in Woods by Raman Imaging and Chemometrics

Carla J. G. Colares; Tereza C. M. Pastore; Vera T. R. Coradin; José A. A. Camargos; Alessandro C. O. Moreira; Joel C. Rubim; Jez W. B. Braga

How to cite this article

 

Microscopic lignin and cellulose image chemical analysis in Mahogany and Eucalyptus by Raman spectroscopy and multivariate curve resolution.

http://dx.doi.org/10.5935/0103-5053.20150096

Published online: April 24, 2015

Short Report J. Braz. Chem. Soc. 2015, 26(6), 1306-1312

Straightforward and Clean Ultrasound-Promoted Synthesis of 2-(4,5-Dihydro-1H-pyrazol-1-yl)pyrimidines

Bruna P. Kuhn; Juliana L. Malavolta; Gleison A. Casagrande; Cristiano Raminelli; Frank H. Quina; Claudio M. P. Pereira; Alex F. C. Flores; Lucas Pizzuti

How to cite this article

 

A series of novel 2-(pyrazol-1-yl)pyrimidine derivatives was easily obtained under ultrasonic conditions.

http://dx.doi.org/10.5935/0103-5053.20150078

Published online: March 31, 2015

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