JBCS

6:17, Mon Jan 22

Open Access/APCs

Forthcoming Papers - 2018

Articles published online ahead of print




Articles J. Braz. Chem. Soc. 2018

Design of Novel N-Miristoiltransferase Inhibitors of Leishmania donovani Using Four-Dimensional Quantitative Structure-Activity Relationship Analysis

Letícia Santos-Garcia; Daniela R. Silva; Letícia C. Assis; Tamiris M. de Assis; Giovanna C. Gajo; Ítalo Antônio Fernandes; Teodorico C. Ramalho; Elaine F. F. da Cunha

Proposed N-myristoyltransferase (NMT) inhibitors of Leishmania donovani anchored in the active site of the enzyme.

http://dx.doi.org/10.21577/0103-5053.20180007

Published online: January 15, 2018.


J. Braz. Chem. Soc. 2018

Polydimethylsiloxane as a Matrix for the Stabilization and Immobilization of Zero‑Valent Iron Nanoparticles. Applications to Dehalogenation of Environmentally Deleterious Molecules

Donaldo Fabio Mercado; Richard G. Weiss

Introduction of zero-valent iron nanoparticles into amino-polydimethylsiloxane based materials allows easy recovery of the particles while maintaining their reactivity toward the dehalogenation of environmental pollutants.

http://dx.doi.org/10.21577/0103-5053.20180006

Published online: January 15, 2018.


Short Report J. Braz. Chem. Soc. 2018

Applying Different Sample Treatment Strategies for Evaluating Phosphorus Distribution in Orange Juice

Maria F. C. da Silva Neta; Ana C. F. de Lyra; Sarah A. R. Soares; Josué C. C. Santos; Daniela S. Anunciação

Estimation of phosphorus distribution in orange juice by different sample treatment strategies including fractioning in function of its particle size and charge.

http://dx.doi.org/10.21577/0103-5053.20180005

Published online: January 11, 2018.

Articles J. Braz. Chem. Soc. 2018

Adsorptive Stripping Voltammetric Determination of Oxolinic Acid in Water Sample

Herbert Aleixo; Leonardo L. Okumura; Astréa F. S. Silva; Alexandre Gurgel; Juliana A. Diniz

A new method for analysis of the antimicrobial oxolinic acid (OXA) in untreated water was developed using carbon paste electrode.

http://dx.doi.org/10.21577/0103-5053.20180004

Published online: January 11, 2018.

J. Braz. Chem. Soc. 2018

Transition from Thermokinetic to Chemical Instabilities in a Modified Sal'nikov Model

Daniel Barragán; Pablo A. Ochoa-Botache

Transition between chemical and thermokinetic oscillations mediated by a stoichiometric bifurcation parameter in a hypothetical biological context: muscle fatigue and possible ATP thermosynthesis.

http://dx.doi.org/10.21577/0103-5053.20180003

Published online: January 10, 2018.


J. Braz. Chem. Soc. 2018

A Multicommuted Flow System for Spectrophotometric Determination of Formaldehyde in Mushroom

Gabriel F. Pinto; Diogo L. Rocha; Eduardo M. Richter; Rodrigo A. A. Muñoz; Sidnei G. da Silva

A multicommuted flow system for spectrophotometric determination of formaldehyde in mushroom based on the Hantzsch reaction (λmax = 412 nm) is reported with a detection limit of 0.02 mg L-1, sample throughput of 17 h-1 and reduced chemical waste.

http://dx.doi.org/10.21577/0103-5053.20180002

Published online: January 5, 2018.

Short Report J. Braz. Chem. Soc. 2018

Mercury Biodistribution in Rats after Chronic Exposure to Mercury Chloride

Mariana Z. G. Fornazier; Tatiani B. Nascimento; Vinicius B. Marques; Tatiana D. Saint'Pierre; Dalton Vassalo; Geisamanda P. Brandão; Leonardo dos Santos; Maria T. W. D. Carneiro

In this work we evaluated the mercury biodistribution after different doses of HgCl2. Mercury was deposited preferentially in some tissues while the blood levels remained practically constant. Therefore, it is suggested that blood mercury monitoring is relevant only when the tissues turn saturated.

http://dx.doi.org/10.21577/0103-5053.20180001

Published online: January 4, 2018.

Articles J. Braz. Chem. Soc. 2017

Synthesis, DNA Interaction and Genotoxic Evaluation of a Photoactive Benzothiadiazole with Potential Application in Photovoltaic Paint

Adriani P. Damiani; Paula Rohr; José L. Westrup; Rodrigo C. Duarte; Luiza M. Longaretti; Bruna M. da Rocha; Giulia Strapazzon; Lara C. Venturini; Emanuel Souza; Claus T. Pich; Tiago E. A. Frizon; Vanessa M. de Andrade; Fabiano S. Rodembusch; Alexandre G. Dal-Bó

The 2,1,3-benzothiadiazole compound can be used safely in manufacturing as a dye for paints and photovoltaic devices.

http://dx.doi.org/10.21577/0103-5053.20170241

Published online: December 21, 2017.

J. Braz. Chem. Soc. 2017

Rapid and Efficient Uncatalyzed Knoevenagel Condensations from Binary Mixture of Ethanol and Water

João M. G. O. Ferreira; João B. M. de Resende Filho; Poliane K. Batista; Ercules E. S. Teotonio; Juliana A. Vale

The uncatalyzed Knoevenagel condensation between aldehydes and different compounds with active methylene was performed under new conditions using a mixture of ethanol/water (3:7, v/v), showing a good isolated yields in a short reaction time.

http://dx.doi.org/10.21577/0103-5053.20170240

Published online: December 21, 2017.


J. Braz. Chem. Soc. 2017

Carbon Nanotube-Supported Copper-Cobalt Catalyst for the Production of Higher Carbon Number Alcohols through Carbon Monoxide Hydrogenation

Peng Wang; Xihua Du; Wenchang Zhuang; Keying Cai; Jing Li; Yan Xu; Yingmei Zhou; Kai Sun; Shuyao Chen; Xiaoli Li; Yisheng Tan

Copper promotes the reduction of CoO and forms Cu0–Co0 active sites; in addition to this center, Co0–Co2+ is also the center for high alcohols synthesis and Co2+ site favor alcohols yields. Excellent C2+ alcohols selectivity is got over the catalyst with weight ratio of Cu/Co = 1.

http://dx.doi.org/10.21577/0103-5053.20170237

Published online: December 20, 2017.


J. Braz. Chem. Soc. 2017

Prediction of Sulfur Content in Diesel/Biodiesel Blends Using LED-Induced Fluorescence Associated with Multivariate Calibration

Alessandra T. Campos; Cristina M. Quintella; Marilena Meira; Saionara Luna

Light emitting diode (LED)-induced fluorescence equipment was used in the biodiesel/diesel/sulfur sample readings and after the analysis the data treatment was done using partial least squares (PLS).

http://dx.doi.org/10.21577/0103-5053.20170236

Published online: December 19, 2017.

J. Braz. Chem. Soc. 2017

Colorimetric Analysis of Cotton Textile Bleaching through H2O2 Activated by UV Light

Bruno P. de Oliveira; Lilian T. Moriyama; Vanderlei S. Bagnato

Scheme of the proposed UV mediated cotton bleaching process with H2O2, evaluated by colorimetry and tensile test.

http://dx.doi.org/10.21577/0103-5053.20170235

Published online: December 19, 2017.

J. Braz. Chem. Soc. 2017

Multi-Residue Method for Determination of Thirty-Five Pesticides, Pharmaceuticals and Personal Care Products in Water Using Ionic Liquid-Dispersive Liquid‑Liquid Microextraction Combined with Liquid Chromatography‑Tandem Mass Spectrometry

Liziane C. Marube; Sergiane S. Caldas; Elisane O. dos Santos; Andressa Michaelsen; Ednei G. Primel

Ionic liquid-dispersive liquid-liquid microextraction (IL-DLLME) was successfully used for the extraction of the pesticides and pharmaceuticals and personal care products (PPCPs) in water.

http://dx.doi.org/10.21577/0103-5053.20170234

Published online: December 19, 2017.


J. Braz. Chem. Soc. 2017

Chain Elongation Influence in Copolymerization with Different Diesters of Norbornene 2,3-Dicarboxylic Acid Monomers via ROMP under Air Atmosphere

Sâmia D. Braga; Vanessa B. Vieira; Cristina V. Silva-Neta; Nouga C. Batista; Larissa R. Fonseca; Benedito S. Lima-Neto; Geraldo E. Luz Jr.; José Luiz S. Sá

Copolymerization via ring-opening metathesis polymerization (ROMP) under air atmosphere of norbornene (NBE) and its ester-dicarboxylic derivate with Ru-catalyst.

http://dx.doi.org/10.21577/0103-5053.20170233

Published online: December 19, 2017.

J. Braz. Chem. Soc. 2017

Determination of Alkyl Esters Content by Gas Chromatography: Validation of Method Based on Short Column and Response Factor

Filipe L. Silva; Lucas N. Melo; Carlos R. Wolf; Simoni M. P. Meneghetti; Janaína H. Bortoluzzi

Quantification of fatty acid methyl or ethyl esters obtained from soybean oil and comparison of analytical methodologies applied to biodiesel samples.

http://dx.doi.org/10.21577/0103-5053.20170232

Published online: December 14, 2017.

J. Braz. Chem. Soc. 2017

Identification of Ethyl and t-Butyl Glyceryl Ethers Using Gas Chromatography Coupled with Mass Spectrometry

Paula M. Veiga; Cláudia O. Veloso; Ayres G. Dias; Cristiane A. Henriques

Gas chromatography-mass spectrometry (GC-MS) identification of ethyl and t-butyl glyceryl ethers.

http://dx.doi.org/10.21577/0103-5053.20170231

Published online: December 14, 2017.


J. Braz. Chem. Soc. 2017

Leaves from the Tree Poincianella pluviosa as a Renewable Source of Antiplasmodial Compounds against Chloroquine-Resistant Plasmodium falciparum

Jacqueline E. de Souza; Maria F. A. do Nascimento; Maria P. G. Borsodi; Ana P. de Almeida; Bartira Rossi-Bergmann; Alaíde B. de Oliveira; Sônia S. Costa

Ten phenolic compounds were isolated from leaves of Poincianella pluviosa (Fabaceae). Among the major compounds, ellagic acid was the most active against Plasmodium falciparum (W2).

http://dx.doi.org/10.21577/0103-5053.20170228

Published online: December 12, 2017.


J. Braz. Chem. Soc. 2017

Synthesis and Antimicrobial Activity of Glycosylated 2-Aryl‑5‑amidinobenzimidazoles

Thiago B. de Souza; Josidel C. Oliver; Ana Paula B. Gomes; Cícero Flávio S. Aragão; Leandro S. Ferreira; Fernando Henrique A. Nogueira; Amanda Latércia T. Dias; Ricardo J. Alves

Glycosylated 2-aryl-5-amidinobenzimidazoles were synthesized, characterized and showed antifungal and antibacterial potential against different strains.

http://dx.doi.org/10.21577/0103-5053.20170227

Published online: December 12, 2017.


J. Braz. Chem. Soc. 2017

Air Quality Indexes in the City of Rio de Janeiro During the 2016 Olympic and Paralympic Games

Felipe Tsuruta; Nicole J. de Carvalho; Cleyton M. da Silva; Graciela Arbilla

The air quality indexes (AQIs) determined in Rio de Janeiro from July to September 2016, before and during the Summer Olympic and Paralympic Games, in four monitoring stations, were compiled and analyzed.

http://dx.doi.org/10.21577/0103-5053.20170226

Published online: December 11, 2017.


J. Braz. Chem. Soc. 2017

Kavalactones and Benzoic Acid Derivatives from Leaves of Piper fuligineum Kunth (Piperaceae)

Bruna F. Mazzeu; Lidiane G. Felippe; Fernando Cotinguiba; Massuo J. Kato; Maysa Furlan

Kavalactones and benzoic acid derivatives from Piper fuligineum shows dichotomous biosynthetic pathways and shikimic acid is a common precursor of this two different classes.

http://dx.doi.org/10.21577/0103-5053.20170225

Published online: December 6, 2017.


J. Braz. Chem. Soc. 2017

A Practical Fluorescence-Based Screening Protocol for Polyethylene Terephthalate Degrading Microorganisms

Michel R. B. Chaves; Maria L. S. O. Lima; Lusiane Malafatti‑Picca; Derlene A. de Angelis; Aline M. de Castro; Érika Valoni; Anita J. Marsaioli

We proposed a fast, low-cost, microscale fluorescence-based screening methodology for PET degrading microorganisms with selective detection of the terephthalic acid monomer produced during the microbial hydrolysis.

http://dx.doi.org/10.21577/0103-5053.20170224

Published online: December 6, 2017.


J. Braz. Chem. Soc. 2017

In vitro Evaluation of Oxidative Stress Caused by Fine Particles (PM2.5) Exhausted from Heavy-Duty Vehicles Using Diesel/Biodiesel Blends under Real World Conditions

Robson M. de Jesus; Aline C. Mosca; Aline L. N. Guarieiro; Gisele O. da Rocha; Jailson B. de Andrade

Oxidative potential of PM2.5 as predictive indicator of adverse health effects.

http://dx.doi.org/10.21577/0103-5053.20170223

Published online: December 6, 2017.

J. Braz. Chem. Soc. 2017

Structure/Activity of PtII/N,N-Disubstituted-N'-acylthiourea Complexes: Anti‑Tumor and Anti-Mycobacterium tuberculosis Activities

Ana M. Plutín; Anislay Alvarez; Raúl Mocelo; Raúl Ramos; Osmar C. Sánchez; Eduardo E. Castellano; Monize M. da Silva; Wilmer Villarreal; Legna Colina-Vegas; Fernando R. Pavan; Alzir A. Batista

Twelve [Pt(PPh3)2(acylthiourea)]PF6 complexes was synthesized and evaluated against Mycobacterium tuberculosis and human tumor cells.

http://dx.doi.org/10.21577/0103-5053.20170222

Published online: December 6, 2017.


J. Braz. Chem. Soc. 2017

Influence of Environmental Factors and Cultural Methods on the Content of N,N-Dimethyltryptamine in Psychotria viridis (Rubiaceae)

André D. Cavalcante; Gabriele A. Cardoso; Fernando L. P. de Oliveira; Eduardo Bearzoti; Adriana A. Okuma; Lucienir P. Duarte; Sidney A. Vieira-Filho

Environmental parameters, nutrients, plant characteristics, data on farming methods were correlated with N,N-dimethyltryptamine, determined by gas chromatography coupled to mass spectrometry (GC-MS).

http://dx.doi.org/10.21577/0103-5053.20170221

Published online: December 6, 2017.


J. Braz. Chem. Soc. 2017

Enhanced Detection of Ponceau 4R Food Dye by Glassy Carbon Electrode Modified with Reduced Graphene Oxide

Paloma B. de Moraes; Felipe F. Hudari; João P. Silva; Maria V. B. Zanoni

A voltammetric method is proposed by a simple electrodeposition of reduced graphene oxide on glassy carbon electrode. The modified electrode showed a 20-fold increase in analyte signal compared to unmodified electrode.

http://dx.doi.org/10.21577/0103-5053.20170219

Published online: December 5, 2017.

J. Braz. Chem. Soc. 2017

Synthesis of Chelating Agent Free-Solid Phase Extractor (CAF-SPE) Based on New SiO2/Al2O3/SnO2 Ternary Oxide and Application for Online Preconcentration of Pb2+ Coupled with FAAS

César R. T. Tarley; Guilherme L. Scheel; Emerson S. Ribeiro; Caroline D. Zappielo; Fabio A. C. Suquila

Chelating agent free-solid phase extractor (CAF-SPE) based on new SiO2/Al2O3/SnO2 for online Pb2+ preconcentration.

http://dx.doi.org/10.21577/0103-5053.20170218

Published online: December 5, 2017.

J. Braz. Chem. Soc. 2017

Continuous Synthesis of a Green Fuel Additive Mixture with Highest Quantities of Solketalacetin and Solketal and Lowest Amount of Diacetin from Biodiesel-Derived Glycerol

Yadollah M. Gorji; Hassan S. Ghaziaskar

Glycerol was reacted first with acetic acid to synthesize monoacetin. Then monoacetin and residual glycerol were reacted with acetone to obtain 62% solketalacetin, 30% solketal, and 8% diacetin.

http://dx.doi.org/10.21577/0103-5053.20170217

Published online: December 5, 2017.


J. Braz. Chem. Soc. 2017

Syntheses, Experimental and Theoretical Studies on Absorption/Emission Properties of Pyrazoline-Containing Aryl/Methoxynaphthyl Substituents

Jorge Trilleras; Edwin González-López; Jhair León-Jaramillo; Alfredo Pérez‑Gamboa; Esneyder Puello-Polo; Pablo Romo; Alejandro Ortíz; Jairo Quiroga

Facile synthesis of pyrazoline derivatives and their luminescence properties. Theoretical calculations at time-dependent density functional theory (TD-DFT) level explain the electronic behavior.

http://dx.doi.org/10.21577/0103-5053.20170216

Published online: December 4, 2017.


J. Braz. Chem. Soc. 2017

Photophysical and Photochemical Properties and Aggregation Behavior of Phthalocyanine and Naphthalocyanine Derivatives

Thalita F. M. de Souza; Felipe C. T. Antonio; Mateus Zanotto; Paula Homem-de-Mello; Anderson O. Ribeiro

Computational calculations (density-functional theory, DFT) of Q-band involved molecular orbitals in phthalocyanines and naphthalocyanines with similar structures.

http://dx.doi.org/10.21577/0103-5053.20170215

Published online: November 28, 2017.


J. Braz. Chem. Soc. 2017

Use of Mixture Design with Minimal Restrictions to Optimize an Extraction Procedure Employing Diluted Acids Assisted by Ultrasound and Microwave for Nutrient Element Determination in Vegetal Samples

Vinícius C. Costa; Erik G. P. Silva; Daniel C. Lima; Marcelo Franco; Raildo M. Jesus; Marcos A. Bezerra; Fábio A. C. Amorim

Optimization of sample preparation based on extraction with diluted acids assisted by ultrasound and microwave for nutrients elements determination.

http://dx.doi.org/10.21577/0103-5053.20170214

Published online: November 27, 2017.

J. Braz. Chem. Soc. 2017

Impact of Cafeteria Diet on the Composition of Fatty Acids in Zebrafish (Danio rerio) Fillets

Vanessa B. M. J. C. Néia; Eliane P. Ambrosio-Albuquerque; Ingrid L. Figueiredo; Joana S. Boeing; Thibério C. da Silva; Vanessa Lewandowski; Ricardo P. Ribeiro; Jeane E. L. Visentainer; Jesuí V. Visentainer

The effect of a cafeteria diet (chocolate, peanut and biscuit) on the composition of fatty acids in zebrafish fillets was evaluated by gas chromatography.

http://dx.doi.org/10.21577/0103-5053.20170213

Published online: November 27, 2017.

J. Braz. Chem. Soc. 2017

Rhodium(III)-Catalyzed Addition of Indoles with Boc-Imines via C−H Bond Activation

Jinfang Wang; Hui Wang; Chuanjun Yue

A rhodium-catalyzed alkylation reaction of indoles with N-Boc-imines has been developed via C−H activation to afford a series of biological important 2-indolylmethanamine derivatives with good functional group tolerance and high yields.

http://dx.doi.org/10.21577/0103-5053.20170212

Published online: November 27, 2017.


J. Braz. Chem. Soc. 2017

Theoretical Study of the Interaction of 1,2-Dithiolene Ligands with the Mg2+ and Ca2+ Aquacations: Electronic, Geometric and Energetic Analysis

Glauber S. Melengate; Stanislav R. Stoyanov; Daniel G. S. Quattrociocchi; Leonardo M. da Costa; Glaucio B. Ferreira

The interaction strength order is quantified in terms of the ΔH and ΔG of substitution of four water molecules from the [Ca(H2O)6]2+ by bidentate dithiolene ligands.

http://dx.doi.org/10.21577/0103-5053.20170210

Published online: November 27, 2017.


J. Braz. Chem. Soc. 2017

Synthesis, Characterization and Catalytic Evaluation of Magnetically Recoverable SrO/CoFe2O4 Nanocatalyst for Biodiesel Production from Babassu Oil Transesterification

Milton S. Falcão; Marco A. S. Garcia; Carla V. R. de Moura; Sabrina Nicolodi; Edmilson M. de Moura

A very efficient SrO-based magnetic heterogeneous catalyst was developed in the studies presented herein. Biodiesel was produced from babassu oil transesterification with high yields in four catalytic cycles.

http://dx.doi.org/10.21577/0103-5053.20170209

Published online: November 27, 2017.

J. Braz. Chem. Soc. 2017

Structures, Stabilities, Reactivities, and (Hyper)Polarizabilities of Small Gold Clusters

Francisco E. Jorge; Alexsandro S. Santos

DKH2-B3PW91/DZP+1d-DKH optimized ground state electronic structures for the gold clusters, Aun (n = 3-8).

http://dx.doi.org/10.21577/0103-5053.20170207

Published online: November 22, 2017.

J. Braz. Chem. Soc. 2017

A New, Friendlier Methodology to Determine the Average Manganese Valence in LixMn2O4 Spinels Using Atomic Absorption Spectrometry and Molecular Absorption Spectrophotometry

João P. Silva; Ricardo M. Silva; Sonia R. Biaggio; Nerilso Bocchi; Romeu C. Rocha-Filho

Precise average manganese valences (ν) for Mn oxides are attained spectroscopically. When the oxides react with Fe2+, Mnν+ is reduced to Mn2+; thence [Mn2+] is determined by AAS and excess [Fe2+] by MAS (after Fe2+ complexation with o-phenanthroline), enabling the determination of ν.

http://dx.doi.org/10.21577/0103-5053.20170206

Published online: November 17, 2017.

J. Braz. Chem. Soc. 2017

Interlaboratory Comparison for the Characterization of a Brazilian Mussel Reference Material

Edson G. Moreira; Marina B. A. Vasconcellos; Vera A. Maihara; Marília G. M. Catharino; Mitiko Saiki

Production of a mussel reference material: from the living organism to certified mass fractions in bottles.

http://dx.doi.org/10.21577/0103-5053.20170205

Published online: November 17, 2017.

J. Braz. Chem. Soc. 2017

Antimicrobial Activity of 3,4-seco-Diterpenes Isolated from Croton blanchetianus against Streptococcus mutans and Streptococcus parasanguinis

Nairley C. S. Firmino; Francisco S. O. Alexandre; Mayron A. de Vasconcelos; Alison J. S. Conrado; Francisco V. S. Arruda; Edilberto R. Silveira; Edson H. Teixeira

Three antibacterial 3,4-seco-diterpenes were isolated from hexane extracts of roots of individual specimens of Croton blanchetianus Baill.

http://dx.doi.org/10.21577/0103-5053.20170204

Published online: November 17, 2017.


J. Braz. Chem. Soc. 2017

Development and Validation of Liquid Chromatography-Tandem Mass Spectrometry Methods for Determination of Beta-Lactams, Macrolides, Fluoroquinolones, Sulfonamides and Tetracyclines in Surface and Drinking Water from Rio de Janeiro, Brazil

Mychelle A. Monteiro; Bernardete F. Spisso; Rosana G. Ferreira; Mararlene U. Pereira; Jônatas V. Grutes; Bárbara R. G. de Andrade; Luiz A. d'Avila

Antibiotics in the aquatic environment are present at low level. This method was applied for quantification of 46 analytes. The validation tests showed good performance for the surface and drinking water. The method was applied to evaluate these compounds in samples from Rio de Janeiro.

http://dx.doi.org/10.21577/0103-5053.20170203

Published online: November 17, 2017.

J. Braz. Chem. Soc. 2017

A Convenient and Efficient Method for the Synthesis of a Novel Series of N‑Butyl‑1,4-oxazino[2',3':4,5]pyrano[3,2-c]quinolinones

Hany M. Hassanin; Mohamed M. Hassan

Starting from 3-amino and/or 3-nitro-4-hydroxypyranoquinolindione, some novel 1,4-oxazinopyranoquinolinone derivatives have been synthesized.

http://dx.doi.org/10.21577/0103-5053.20170202

Published online: November 14, 2017.


J. Braz. Chem. Soc. 2017

Factorial Design Applied for Evaluation of Effect of Interactions among Precursors on the Thermal Decomposition Temperature of Montmorillonite/Poly(Methyl Methacrylate) Nanocomposites

Joseane A. Santana; Rennan G. O. Araujo; Filipe A. de Jesus; Kelly S. Lima; Giovanna Machado; Maria C. P. Cruz; Victor H. V. Sarmento

A full factorial design was utilized to synthesize and to statistically study thermal properties of montmorillonite/poly(methyl methacrylate) nanocomposites.

http://dx.doi.org/10.21577/0103-5053.20170201

Published online: November 13, 2017.

J. Braz. Chem. Soc. 2017

Targeted-Analysis of β-Carboline Alkaloids in Passionfruit ("Maracujá") by SBSE(PDMS)-LC/Flu and UHPLC-MS

Vítor F. Freire; Gabriela R. Silva; Janete H. Yariwake

β-Carboline alkaloids were identified in passionfruit by using UHPLC-MS (ultrahigh performance liquid chromatography-mass spectrometry) and SBSE(PDMS) (stir bar sorption extraction using polydimethylsiloxane as stationary phase) techniques.

http://dx.doi.org/10.21577/0103-5053.20170200

Published online: November 10, 2017.


J. Braz. Chem. Soc. 2017

Antimicrobial Activity of Paepalanthus planifolius and its Major Components against Selected Human Pathogens

Marcelo R. de Amorim; Felipe Hilário; Paulo T. Sano; Tais M. Bauab; Lourdes C. dos Santos

New naphthopyranone dimer named planifoliusin A isolated from Paepalanthus planifolius.

http://dx.doi.org/10.21577/0103-5053.20170199

Published online: November 10, 2017.


J. Braz. Chem. Soc. 2017

Magnetic Solid-Phase Extraction Combined with Dispersive Liquid-Liquid Microextraction Followed by HPLC for Determination of Four Aromatic Amines Released from Azo Dyes in Paper Samples

Xiaolan Li; Dongling Meng; Ruiqi Liu; Yaling Yang

As shown in the figure, n-octanol, which was used as the extractant, and hydrophobic oleic acid modified Fe3O4 nanoparticles (Fe3O4@OA NPs), as an efficient adsorbent, were applied to retrieve the primary aromatic amines (PAAs)-containing n-octanol in the dispersive liquid-liquid microextraction (DLLME) step.

http://dx.doi.org/10.21577/0103-5053.20170198

Published online: November 9, 2017.

J. Braz. Chem. Soc. 2017

Microemulsion as Sample Preparation for Direct Flame Atomic Absorption Spectrometry (FAAS) Determination of Total Iron in Crude and Refined Vegetable Oils

Marília B. Galuch; Angélica F. B. Piccioli; Eduardo Sobieski Neto; Natália Fier; Nayara C. Saldan; Edivaldo E. Garcia

A fast and simple analytical method was firstly proposed for the determination of iron (Fe) in crude and refined vegetable oil samples by employing the conventional flame atomic absorption spectrometry (FAAS) technique and microemulsification as sample preparation procedure.

http://dx.doi.org/10.21577/0103-5053.20170197

Published online: November 3, 2017.

J. Braz. Chem. Soc. 2017

Two Novel Donepezil-Lipoic Acid Hybrids: Synthesis, Anticholinesterase and Antioxidant Activities and Theoretical Studies

Bruna S. Terra; Pedro H. C. da Silva; Anna Tramarin; Lucas L. Franco; Elaine F. F. da Cunha; Fernando Macedo Junior; Teodorico C. Ramalho; Manuela Bartolini; Maria L. Bolognesi; Ângelo de Fátima

Two hybrids containing the indanone-piperidine moiety of donepezil and lipoic acid scaffolds were synthesized. One hybrid displayed moderate inhibitory activity against hAChE and greater activity against hBuChE. It also showed a good antioxidant activity, exhibiting better ability in scavenging 2,2-diphenyl-1 picrylhydrazyl (DPPH) radicals than lipoic acid.

http://dx.doi.org/10.21577/0103-5053.20170196

Published online: October 31, 2017.


J. Braz. Chem. Soc. 2017

Development and Validation of a Rapid and Reliable RP-HPLC-PDA Method for the Quantification of Six Diterpenes in Copaifera duckei, Copaifera reticulata and Copaifera multijuga Oleoresins

Luiza J. Carneiro; Thamires C. Bianchi; Jonas J. M. da Silva; Larissa C. Oliveira; Carly H. G. Borges; Danieli C. Lemes; Jairo K. Bastos; Rodrigo C. S. Veneziani; Sérgio R. Ambrósio

Development and validation of a rapid and reliable reversed-phase high-performance liquid chromatography with photodiode array detection (RP-HPLC-PDA) method for quantifying six diterpenes in three species of Brazilian Copaifera oleoresins: C. duckei, C. reticulata and C. multijuga.

http://dx.doi.org/10.21577/0103-5053.20170195

Published online: October 27, 2017.


Short Report J. Braz. Chem. Soc. 2017

Solid Phase Microextraction (SPME) Fibers: in situ Measurements of Endocrine Disrupting Chemicals in Seawater

Dayana M. Santos; Mike Williams; Rai Kookana; Mary R. R. de Marchi

Solid phase microextraction (SPME) fibers for use as passive sampler of endocrine disrupting chemicals as triclosan, bisphenol A and 17α-ethinylestradiol in seawater.

http://dx.doi.org/10.21577/0103-5053.20170193

Published online: October 25, 2017.

Articles J. Braz. Chem. Soc. 2017

Design, Synthesis, Biological Evaluation and Molecular Modeling Studies of Novel Eugenol Esters as Leishmanicidal Agents

Camila M. Coelho; Thiago dos Santos; Poliany G. Freitas; Juliana B. Nunes; Marcos J. Marques; Camila G. D. Padovani; Wagner A. S. Júdice; Ihosvany Camps; Nelson J. F. da Silveira; Diogo T. Carvalho; Marcia P. Veloso

Synthesis of novel eugenol esters designed to inhibit the Leishmania rCPB 2.8 enzyme and in vitro evaluation of their biological activity. The molecular modeling study investigated the possible mechanisms of activation and inhibition exerted by some of these compounds on the enzyme rCPB 2.8.

http://dx.doi.org/10.21577/0103-5053.20170192

Published online: October 25, 2017.


J. Braz. Chem. Soc. 2017

HR-MAS NMR Allied to Chemometric on Hancornia speciosa Varieties Differentiation

Igor S. Flores; Andressa K. Silva; Leonnardo C. Furquim; Carlos F. S. Castro; Lazaro J. Chaves; Rosane G. Collevatti; Luciano M. Lião

Chemometric analyses of 1H high-resolution magic angle spinning nuclear magnetic resonance (1H HR-MAS NMR) data for the chemotaxonomic investigation of Hancornia speciosa (mangaba) varieties.

http://dx.doi.org/10.21577/0103-5053.20170191

Published online: October 25, 2017.

J. Braz. Chem. Soc. 2017

Synthesis and Antibacterial Evaluation of 2-Ethyl-1-(4-substituted)phenyl-1H-imidazole Derivatives as Open-Chain Analogues of 7-Alkoxyl-4,5-dihydroimidazo[1,2-α]quinolines

Xian-Yu Sun; Mei-Yu Liu; Chun-Yan Zhong; Gui-Lin Zheng; Ming-Yue Lv; Bo-Tao Jing; Chun-Yuan Pan; Xin Wang

An outstanding compound was found to possess slightly more potent antibacterial activity against several bacterial strains than the reference drugs.

http://dx.doi.org/10.21577/0103-5053.20170190

Published online: October 19, 2017.

Short Report J. Braz. Chem. Soc. 2017

Absolute Configuration of Clemateol

Marcelo Pedroso; Adriana Z. Gehn; Mateus L. Stivanin; Enrique L. Larghi; Robert A. Burrow; Jackson A. L. C. Resende; Ubiratan F. da Silva; Marco A. Mostardeiro; Ionara I. Dalcol; Ademir F. Morel

The absolute stereochemistry of clemateol was established on the basis of detailed NMR spectroscopic evidence (3JH-H analysis, derivatization as Mosher's esters and NOESY) and also by resonance scattering effects in the single crystal X-ray diffraction experiment of its (R)-mandelic acid ester derivative.

http://dx.doi.org/10.21577/0103-5053.20170189

Published online: October 17, 2017.


Articles J. Braz. Chem. Soc. 2017

A New Method for the Determination of Creatinine in Urine Samples Based on Disposable Pipette Extraction

Aline R. Fernandes; Paulo S. de Souza; Anselmo E. de Oliveira; Andréa R. Chaves

A simple, sensitive and reliable DPX/LC-UV (disposable pipette extraction using liquid chromatography with ultraviolet detection) method for the rapid determination of creatinine levels in urine samples.

http://dx.doi.org/10.21577/0103-5053.20170187

Published online: October 17, 2017.

J. Braz. Chem. Soc. 2017

Electrocatalytic Oxidation Removal of Phenol from Aqueous Solution with Metal Oxides Doped Carbon Aerogel

Gui-Fen Lv; Yuan-Hua Chen; Tao Yang and Jian-Guo Li

For metal oxides doped carbon aerogel (CA), the n-type and p-type semiconductors exhibited different electrocatalytic effect for phenol removal, and the former has higher effect.

http://dx.doi.org/10.21577/0103-5053.20170185

Published online: October 13, 2017.

Short Report J. Braz. Chem. Soc. 2017

Comparison between Ultrasound Assisted Extraction and Microwave Digestion in the Determination of Arsenic in Edible Grains

Roberto V. Ribeiro; Júlia C. Vieira; Fabiana A. Lobo; Roberta E. S. Froes-Silva

Comparison between microwave digestion and ultrasound assisted extraction (UAE) was made. UAE presents better performance compared to microwave digestion in arsenic extraction. Accuracy performance was close to 100% for all three methods developed. Bean samples cultivated in impacted areas presented 0.3 µg g-1 of arsenic concentration.

http://dx.doi.org/10.21577/0103-5053.20170184

Published online: October 13, 2017.

Articles J. Braz. Chem. Soc. 2017

Qualitative and Quantitative Chemical Investigation of Orthopedic Alloys by Combining Wet Digestion, Spectroanalytical Methods and Direct Solid Analysis

Caio M. Figueiredo; Jeyne P. Castro; Marco A. Sperança; Lucimar L. Fialho; Joaquim A. Nóbrega; Edenir R. Pereira-Filho

Laser-based analytical techniques for direct qualitative evaluation of orthopedic Ti alloys, and results comparison with data obtained after microwave-assisted digestion and inductively coupled plasma optical emission (ICP OES) determination.

http://dx.doi.org/10.21577/0103-5053.20170182

Published online: October 10, 2017.

J. Braz. Chem. Soc. 2017

Development of a Novel and Simple Electroanalytical Procedure for the Determination of Copper in Biofuel Employing a Sensor Based on Vulcan Functionalized with Carbazone

Tayane A. Freitas; Manoel J. A. Lima; Aldaléa L. B. Marques; Edmar P. Marques; Rita C. S. Luz; Cicero W. B. Bezerra

Carbon paste electrode modified with Vulcan-carbazone presenting electroanalytical response for Cu2+ ions.

http://dx.doi.org/10.21577/0103-5053.20170181

Published online: October 10, 2017.

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