JBCS

9:41, Tue May 23

Open Access/APCs

vol. 26, No. 10, 2015, p. 1967-2168

 

Higher ozone concentrations are observed during weekends in big cities and Rio de Janeiro case is detailed for 2012 and 2013. During weekends the low nitrogen oxide emissions reduce the ozone consumption by this molecule, despite the reduction on the primary pollutant concentrations, which indicated that a reduction in vehicle emissions occurred over the weekends. The weekend effect occurred in all of the three evaluated stations, with greater intensity at the Campo Grande and Irajá stations.. Details are presented in the Article Understanding Ozone Concentrations During Weekdays and Weekends in the Urban Area of the City of Rio de Janeiro by Eduardo M. Martins, Anna C. L. Nunes and Sergio M. Corrêa on page 1967.


Cover Article
J. Braz. Chem. Soc. 2015, 26(10), 1967-1975

Understanding Ozone Concentrations During Weekdays and Weekends in the Urban Area of the City of Rio de Janeiro

Eduardo M. Martins; Anna C. L. Nunes; Sergio M. Corrêa

How to cite this article

Higher ozone concentrations are observed during weekends in big cities and Rio de Janeiro case is detailed for 2012 and 2013. During weekends the low nitrogen oxide emissions reduce the ozone consumption by this molecule, despite the reduction on the primary pollutant concentrations, which indicated that a reduction in vehicle emissions occurred over the weekends. The weekend effect occurred in all of the three evaluated stations, with greater intensity at the Campo Grande and Irajá stations.. Details are presented in the Article Understanding Ozone Concentrations During Weekdays and Weekends in the Urban Area of the City of Rio de Janeiro by Eduardo M. Martins, Anna C. L. Nunes and Sergio M. Corrêa on page 1967.

http://dx.doi.org/10.5935/0103-5053.20150175

Published online: July 17, 2015

Articles J. Braz. Chem. Soc. 2015, 26(10), 1967-1975

Understanding Ozone Concentrations During Weekdays and Weekends in the Urban Area of the City of Rio de Janeiro

Eduardo M. Martins; Anna C. L. Nunes; Sergio M. Corrêa

How to cite this article

 

The lower NO emission during weekends promotes ozone accumulation in Rio de Janeiro city.

http://dx.doi.org/10.5935/0103-5053.20150175

Published online: July 17, 2015

J. Braz. Chem. Soc. 2015, 26(10), 1976-1980

Cytotoxic Alkaloids from Hippeastrum solandriflorum Lindl.

Kaline R. Carvalho; Alison B. Silva; Maria Conceição M. Torres; Francisco Chagas L. Pinto; Larissa A. Guimarães; Danilo D. Rocha; Edilberto R. Silveira; Letícia V. Costa-Lotufo; Raimundo Braz-Filho; Otília Deusdênia. L. Pessoa

How to cite this article

 

One new homolycorine-type alkaloid, 2α-10bα-dihydroxy-9-O-demethylhomolycorine, in addition to seven known were isolated from the bulbs of Hippeastrum solandriflorum (Amaryllidaceae). Their structures were determined by spectrometric methods. Two compounds exhibited significant cytotoxic activity

http://dx.doi.org/10.5935/0103-5053.20150176

Published online: July 17, 2015


J. Braz. Chem. Soc. 2015, 26(10), 1981-1987

Determination of Essential, Non-Essential, and Potentially Toxic Elements in Graviola (Annona muricata L.) Pulp by ICP OES and GF AAS

Gislayne A. R. Kelmer; Angerson N. Nascimento; Pedro V. Oliveira

How to cite this article

 

Essential, nonessential and potentially toxic elements were determined in graviola pulp by inductively coupled plasma optical emission spectrometry (ICP OES) and graphite furnace atomic absorption spectrometry (GF AAS). Graviola can be considered a good source of B, Cu, K, Mg and Mn.

http://dx.doi.org/10.5935/0103-5053.20150177

Published online: July 17, 2015

J. Braz. Chem. Soc. 2015, 26(10), 1988-1993

Determination of Cd, Ni and V in Spices by Solid Sampling High-Resolution Continuum Source Graphite Furnace Atomic Absorption Spectrometry

Alex Virgilio; Jardes F. Rêgo; Ariane I. Barros; José A. Gomes Neto

How to cite this article

 

A direct solid sampling high-resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS GF AAS) procedure with calibration using aqueous standards was employed for the determination of Cd, Ni and V in spices.

http://dx.doi.org/10.5935/0103-5053.20150178

Published online: July 21, 2015

J. Braz. Chem. Soc. 2015, 26(10), 1994-2002

Effects of Types of Washing and Peeling in Relation to Pesticide Residues in Tomatoes

Graziela C. R. M. Andrade; Sérgio H. Monteiro; Jeane G. Francisco; Leila A. Figueiredo; Aderbal A. Rocha; Valdemar L. Tornisielo

How to cite this article

 

Quick, easy, cheap, effective, rugged and safe (QuEChERS) was used to determine pesticides in tomato after washing treatments. Liquid chromatography tandem mass spectrometry (LC-MS/MS) in dynamic multiple-reaction monitoring mode (DMRM) was used for the detection of compounds. Washing and peeling before consumption contributes to reduce pesticide residues in tomato.

http://dx.doi.org/10.5935/0103-5053.20150179

Published online: July 24, 2015

J. Braz. Chem. Soc. 2015, 26(10), 2003-2013

Preparation of a Nitrite Electrochemical Sensor Based on Polyaniline/Graphene-Ferrocenecarboxylic Acid Composite Film Modified Glass Carbon Electrode and its Analytical Application

Yuli Wei; Fang Fang; Wu Yang; Hao Guo; Xiuli Niu; Lijun Sun

How to cite this article

 

A nitrite electrochemical sensor was prepared by depositing polyaniline (PANI) on graphene (GR) and ferrocenecarboxylic acid (FCA) modified electrode. The modified electrode has a highly catalytic activity for the oxidation of NO2- and was applied to detect NO2- sensitively.

http://dx.doi.org/10.5935/0103-5053.20150180

Published online: July 24, 2015

J. Braz. Chem. Soc. 2015, 26(10), 2014-2021

Methyl Salicylate: an Alternative Extraction Solvent for Dispersive-Liquid-Liquid Microextraction of Benzimidazole Fungicides in Water Samples Followed by High-Performance Liquid Chromatographic Analysis

Yanawath Santaladchaiyakit; Nattaphorn Phiroonsoontorn; Chuda Sillapatiwat; Kanyavee Kotchalee; Supalax Srijaranai

How to cite this article

 

Methyl salicylate has firstly been demonstrated as an alternative extraction solvent for dispersive liquid-liquid microextraction of benzimidazole fungicides in environmental water samples. The method is simple, rapid, low cost, and reliable for trace analysis of fungicides.

http://dx.doi.org/10.5935/0103-5053.20150181

Published online: July 24, 2015


J. Braz. Chem. Soc. 2015, 26(10), 2022-2028

Oxidative Stress Parameters, Related Trace Elements Levels and Proteomics in Soybean Seeds in Order to Get a Better Assessment of Their Quality

Josefina Cardoso; Ignacio Machado; Juan O. Irigoyen; Marco A. Z. Arruda; Inés Viera; Mariela Pistón; María H. Torre

How to cite this article

 

Antioxidant systems, Fe, Cu, Zn, Mn and Ni levels and proteomics in soybean seeds of different performance in field were assessed. Basal superoxide content and Zn level contribute to predict a possible poor performance in field.

http://dx.doi.org/10.5935/0103-5053.20150182

Published online: July 24, 2015

J. Braz. Chem. Soc. 2015, 26(10), 2029-2034

Use of an Automatic System in the Preparation of Gas Mixtures for Multivariate Calibration: A Case Study Involving NIR Analysis of Natural Gas

Mayara F. Barbosa; Hebertty V. Dantas; Pablo N. T. Moreira; Roberto K. H. Galvão; Mário C. U. Araújo

How to cite this article

 

A multivariate model for near-infrared (NIR) spectrometric analysis of natural gas is developed by using calibration mixtures prepared by an automatic system.

http://dx.doi.org/10.5935/0103-5053.20150183

Published online: July 24, 2015


J. Braz. Chem. Soc. 2015, 26(10), 2035-2045

Development of a Selective and Sensitive Sensor for Urate Determination Based on Tris(1,10-phenantroline)copper(II) Bis(tetracyanoquinodimethanide) Adsorbed on Carbon Nanotubes

Dilton M. Pimentel; Fernando M. de Oliveira; Wallans T. P. dos Santos; Lauro T. Kubota; Flávio S. Damos; Rita C. S. Luz

How to cite this article

 

A new electrode based on carbon nanotube and Cu(phen)2(TCNQ)3 was developed. The Cu(phen)3(TCNQ)2/CNT modified glassy carbon electrode showed an excellent electrocatalytic activity toward urate oxidation. The sensor was successfully applied to urate determination in urine samples.

http://dx.doi.org/10.5935/0103-5053.20150184

Published online: July 24, 2015

J. Braz. Chem. Soc. 2015, 26(10), 2046-2053

Dispersive Liquid-Liquid Microextraction Based on Solidification of Floating Organic Drop with Central Composite Design for the Determination of Nitrophenols Using High-Performance Liquid Chromatography

Beshare Hashemi; Mojtaba Shamsipur; Ali Barati

How to cite this article

 

In this work, a dispersive liquid-liquid microextraction method based on solidification of organic drop (DLLME-SFO) followed by high performance liquid chromatography (HPLC) was applied to determine the amount of two nitrophenols in water samples. The effect of the main experimental variables on the extraction procedure was investigated and optimized by the experimental design method.

http://dx.doi.org/10.5935/0103-5053.20150185

Published online: July 24, 2015

J. Braz. Chem. Soc. 2015, 26(10), 2054-2062

Chemical Characterization and Optimization of the Extraction Process of Bioactive Compounds from Propolis Produced by Selected Bees Apis mellifera

Tatiane Luiza Cadorin Oldoni; Sheila C. Oliveira; Suelen Andolfatto; Mariéli Karling; Matheus A. Calegari; Ricardo Y. Sado; Fabiana M. C. Maia; Severino M. Alencar; Vanderlei A. Lima

How to cite this article

 

The extraction process of bioactive compounds from the propolis produced by selected bees was optimized using a 23 factorial design and the extract produced in the optimal condition was evaluated determining its chemical composition and antioxidant activity.

http://dx.doi.org/10.5935/0103-5053.20150186

Published online: July 28, 2015

J. Braz. Chem. Soc. 2015, 26(10), 2063-2068

Sequential Injection Analysis with Square Wave Voltammetry (SI-SWV) Detection for Investigation of Adsorption of Picloram on a Clay Soil

Luciana B. O. dos Santos; Jorge C. Masini

How to cite this article

 

Sequential injection manifold for determination of the free picloram concentrations employing square wave voltammetry.

http://dx.doi.org/10.5935/0103-5053.20150187

Published online: July 28, 2015

J. Braz. Chem. Soc. 2015, 26(10), 2069-2076

Biomimetic Sensor for Detection of Hydrochlorothiazide Employing Amperometric Detection and Chemometrics for Application in Doping in Sports

Mayara R. S. Ruy; Eduardo C. Figueira; Maria D. P. T. Sotomayor

How to cite this article

 

The sensor, based on hemin, is a viable alternative for the determination of hydrochlorothiazide in a simple, rapid, selective and sensitive way for the application in doping and quality control.

http://dx.doi.org/10.5935/0103-5053.20150189

Published online: July 31, 2015

J. Braz. Chem. Soc. 2015, 26(10), 2077-2087

Development of a Multiresidue Method for Pesticide Analysis in Drinking Water by Solid Phase Extraction and Determination by Gas and Liquid Chromatography with Triple Quadrupole Tandem Mass Spectrometry

Filipe F. Donato; Manoel L. Martins; Juliana S. Munaretto; Osmar D. Prestes; Martha B. Adaime; Renato Zanella

How to cite this article

 

Considering the importance of pesticide residues monitoring programs in drinking water to attend the legislations, reliable methods with high detectability and selectivity are required. A method for the determination of 70 pesticide residues in drinking water using solid phase extraction (SPE) with polymeric sorbent and gas chromatography coupled to tandem mass spectrometry (GC-MS/MS) and liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) was developed and validated.

http://dx.doi.org/10.5935/0103-5053.20150192

Published online: August 4, 2015


J. Braz. Chem. Soc. 2015, 26(10), 2088-2096

Bioactive Cyanopeptides Produced by Sphaerocavum brasiliense Strains (Cyanobacteria)

Maria Estela Silva-Stenico; Janaina Rigonato; Adriana Sturion Lorenzi; Maria Teresa Paiva Azevedo; Célia Leite Sant'Anna; Marli Fátima Fiore

How to cite this article

 

Photomicrograph of Sphaerocavum brasiliense colony (scale bar = 20 µm, 400×). Source: Watson A. Gama.

http://dx.doi.org/10.5935/0103-5053.20150194

Published online: August 7, 2015


J. Braz. Chem. Soc. 2015, 26(10), 2097-2104

Response Surface Methodology Applied in the Study of Emulsion Formulations in the Presence of Leaves of Rosemary (Rosmarinus officinalis L.) as a Source of Natural Antioxidants

Thiago Claus; Sylvio V. Palombini; Fabiana Carbonera; Ingrid L. Figueiredo; Makoto Matsushita; Jesuí V. Visentainer

How to cite this article

 

Rosemary (Rosmarinus officinalis L.) is an excellent source of natural antioxidants for the emulsion systems. The higher gains in lipid protection were obtained by oil-in-water systems, principally.

http://dx.doi.org/10.5935/0103-5053.20150195

Published online: August 7, 2015

J. Braz. Chem. Soc. 2015, 26(10), 2105-2115

Efficient Eco-Friendly Solvent-Free Click Synthesis and Antimicrobial Evaluation of New Fluorinated 1,2,3-Triazoles and their Conversion into Schiff Bases

Mohamed R. Aouad

How to cite this article

 

This study reports a rapid green click synthesis of novel fluorinated 1,2,3-triazole diesters under solvent-free conditions. The resulting diesters were converted to their corresponding bishydrazones and evaluated for their antimicrobial activity.

http://dx.doi.org/10.5935/0103-5053.20150196

Published online: August 7, 2015


J. Braz. Chem. Soc. 2015, 26(10), 2116-2124

Total Mercury Determination in Petroleum Green Coke and Oily Sludge Samples by Cold Vapor Atomic Fluorescence Spectrometry

Adriana S. Camera; Tatiane A. Maranhão; Fernando J. S. Oliveira; Jessee S. A. Silva; Vera L. A. Frescura

How to cite this article

 

Petroleum refining wastes are potential source of Hg and consequently harmful to environment and humans but it could be an alternative source of energy.

http://dx.doi.org/10.5935/0103-5053.20150197

Published online: August 7, 2015

J. Braz. Chem. Soc. 2015, 26(10), 2125-2129

Transport Properties of Binary Solutions Containing the Ionic Liquid BMI.BF4 and Ethylene Glycol

Fernanda T. Silva; Demétrius W. Lima; Márcia R. Becker; Roberto F. Souza; Emilse M. A. Martini

How to cite this article

 

Ionic conductivity values of binary solutions containing ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate (BMI.BF4) and ethylene glycol at different concentrations and over a wide temperature range.

http://dx.doi.org/10.5935/0103-5053.20150198

Published online: August 11, 2015

J. Braz. Chem. Soc. 2015, 26(10), 2130-2136

Use of Biodiesel Press Cake Waste to Prepare Fe/Carbon Reactive Composites for Environmental Applications: Removal of Hazardous CrVI Contaminants

Elizângela A. Santos; Paulo F. R. Ortega; Rodrigo L. Lavall; Sérgio C. Reis; José D. Ardisson; Rochel M. Lago; Clésia C. Nascentes; Letícia M. Costa

How to cite this article

 

Biodiesel press cake combined with Fe produces reactive composites supported on carbon to be used in CrVI removal.

http://dx.doi.org/10.5935/0103-5053.20150199

Published online: August 11, 2015


J. Braz. Chem. Soc. 2015, 26(10), 2137-2143

Rapid Determination of Lead in Progressive Hair Dye Lotion by Spot Test/Diffuse Reflectance Spectroscopy with a Paper Platform

Vitor H. M. Luiz; Lívia M. Saraiva; Ângela P. Martins; Leonardo Pezza; Helena R. Pezza

How to cite this article

 

A simple and clean methodology employing a combined spot test/diffuse reflectance spectroscopy procedure was developed and applied for analysis of lead in progressive hair dyes, using a filter paper platform.

http://dx.doi.org/10.5935/0103-5053.20150200

Published online: August 14, 2015

J. Braz. Chem. Soc. 2015, 26(10), 2144-2149

Chemical Speciation of Iron in Different Varieties of Beans (Phaseolus vulgaris L.): Cooking Effects

Aline P. Oliveira; Juliana Naozuka

How to cite this article

 

Simple fractionation procedures allowed the chemical speciation of Fe and the study of cooking effects on the distribution of Fe-species in seven different varieties of Phaseolus beans. Soluble and inorganic iron concentration suffered alterations due to cooking.

http://dx.doi.org/10.5935/0103-5053.20150201

Published online: August 14, 2015

J. Braz. Chem. Soc. 2015, 26(10), 2150-2158

Application of Bar Adsorptive Microextraction-Large-Volume Injection-Gas Chromatography-Mass Spectrometric Method for the Determination of Trace Levels of Agrochemicals in Real Matrices

João R. Bernarda; Samir M. Ahmad; Carlos Almeida; Nuno R. Neng; José Manuel F. Nogueira

How to cite this article

 

Application of bar adsorptive microextraction for the analysis of environmental water and wine matrices using floating sampling technology.

http://dx.doi.org/10.5935/0103-5053.20150202

Published online: August 14, 2015

J. Braz. Chem. Soc. 2015, 26(10), 2159-2168

Square-Wave Voltammetric Determination of Paracetamol and Codeine in Pharmaceutical and Human Body Fluid Samples Using a Cathodically Pretreated Boron-Doped Diamond Electrode

Anderson M. Santos; Fernando C. Vicentini; Patrícia B. Deroco; Romeu C. Rocha-Filho; Orlando Fatibello-Filho

How to cite this article

 

A novel electroanalytical method was developed for the simultaneous determination of paracetamol and codeine in pharmaceutical formulations and human body fluids. The method involves the combination of square-wave voltammetry with a cathodically pretreated boron-doped diamond electrode.

http://dx.doi.org/10.5935/0103-5053.20150203

Published online: August 14, 2015

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