9:23, Sun Apr 21

Open Access/APCs

Forthcoming Papers - 2019

Articles published online ahead of print

Articles J. Braz. Chem. Soc. 2019

Pesticide Determination in Water Samples from a Rural Area by Multi-Target Method Applying Liquid Chromatography-Tandem Mass Spectrometry

Mariana B. Almeida; Tiago B. Madeira; Lycio S. Watanabe; Paulo Cesar Meletti; Suzana Lucy Nixdorf

Liquid chromatography-tandem mass spectrometry (LC-MS/MS) multi-target screening and quantitation indicated alarming pesticide contamination in all waters sources analyzed from a rural area.


Published online: April 18, 2019.

J. Braz. Chem. Soc. 2019

Tuning Emitting Color of Electroluminescent Devices Containing Tris(2‑acyl‑1,3‑indandionate)aluminum(III) Complexes as Emitting Layers

Israel F. Costa; Jandeilson L. Moura; Rian E. Aderne; Harold C. Avila; Marco Cremona; Hermi F. Brito; Maria Cláudia F. C. Felinto; Wagner M. Faustino; Ercules E. S. Teotonio

The photo- and electroluminescence properties of novel 2-acyl-1,3-indandionate complexes were investigated. The electroluminescent devices with configurations glass/ITO/β-NPB/[Al(acind)3]/LiF/Al and glass/ITO/β-NPB/spiro-2CBP/[Al(acind)3]/Al exhibited red and green emission colors, respectively, under applied voltage.


Published online: April 17, 2019.

J. Braz. Chem. Soc. 2019

Addition of CeO2 Nanorods in PtSn-Based Electrocatalysts for Ethanol Electrochemical Oxidation in Acid Medium

Tuani C. Gentil; Victor S. Pinheiro; Edson C. Paz; Felipe M. Souza; Luanna S. Parreira; Mauro C. Santos

Synthesis of PtSn-based electrocatalysts with CeO2 nanorods used in the ethanol electrochemical oxidation for power generation.


Published online: April 15, 2019.

J. Braz. Chem. Soc. 2019

In vitro Antiplasmodial Activities of Alkaloids Isolated from Roots of Worsleya procera (Lem.) Traub (Amaryllidaceae)

Karla L. Gonring-Salarini; Raphael Conti; Jean Paulo de Andrade; Bárbara Juliana P. Borges; Anna Caroline C. Aguiar; Juliana O. de Souza; Camila L. Zanini; Glaucius Oliva; Juan Carlos Tenorio; Javier Ellena; Jaume Bastida; Rafael V. C. Guido; Warley de S. Borges

Fifteen alkaloids were identified from roots of Worsleya procera. The alkaloids and extracts were tested in vitro against Plasmodium falciparum.


Published online: April 11, 2019.

J. Braz. Chem. Soc. 2019

Chemical Composition and Anti-Inflammatory Activity of the Decoction from Leaves of a Cultivated Specimen of Myracrodruon urundeuva

Nayara C. Aquino; Emerson F. Queiroz; Laurence Marcourt; Lyara B. N. Freitas; Emmanuel V. O. Araújo; Luzia K. A. M. Leal; Antonio M. E. Bezerra; Julien Boccard; Jean-Luc Wolfender; Edilberto R. Silveira

Twenty-four chemical constituents of the decoction from leaves (showing anti-inflammatory activity) of a cultivated specimen of Myracrodruon urundeuva have been isolated and characterized by modern hyphenated chromatography methods (high-speed counter-current chromatography (HSCCC), ultra high-performance liquid chromatography-photodiode array (UHPLC-PDA), and HPLC-PDA-evaporative light scattering detector (ELSD)) and spectroscopy (high-resolution mass spectrometry (HRMS), and 1D and 2D nuclear magnetic resonance (NMR)).


Published online: April 10, 2019.

J. Braz. Chem. Soc. 2019

Production and Characterization of the Bio-Oil Obtained by the Fast Pyrolysis of Spent Coffee Grounds of the Soluble Coffee Industry

Maurício C. Krause; Adriana C. Moitinho; Luiz Fernando R. Ferreira; Ranyere L. de Souza; Laiza C. Krause; Elina B. Caramão

Spent coffee grounds (SGC) from the industrial production of soluble coffee were extracted in Soxhlet generating an oil rich in linoleic and oleic acid. The solid residue of this extraction was subjected to pyrolysis producing bio oil. The bio-oil was analyzed by gas chromatography coupled to the mass spectrometry (GC-MS) allowing the identification of several compounds important for the chemical industry and for the production of biofuels (phenols, acids, caffeine, indole, hydrocarbons)


Published online: April 9, 2019.

J. Braz. Chem. Soc. 2019

Synthesis of Highly Ordered Mesoporous MCM-41: Selective External Functionalization by Time Control

Ana Claudia P. da Silva; Patrícia H. Y. Cordeiro; Bianca M. Estevão; Wilker Caetano; Hellmut Eckert; Silvana M. O. Santin; Murilo P. Moisés; Noboru Hioka; André L. Tessaro

The 3-aminopropyltriethoxysilane (APTES) addition after 90 min of synthesis resulted in a nanoparticle with higher resistance to the extraction process and with more NH2 groups located on the outer surface.


Published online: April 9, 2019.

J. Braz. Chem. Soc. 2019

Droplet Size Distribution in Water-Crude Oil Emulsions by Low-Field NMR

Vinícius G. Morgan; Cristina M. S. Sad; Andre F. Constantino; Rodrigo B. V. Azeredo; Valdemar Lacerda Jr.; Eustáquio V. R. Castro; Lúcio L. Barbosa

Droplet size distribution measurements by low field nuclear magnetic resonance (NMR) in water/oil (W/O) crude oil emulsions prepared under different shear conditions.


Published online: April 9, 2019.

Review J. Braz. Chem. Soc. 2019

Films Formed on Carbon Steel in Sweet Environments - A Review

Igor A. Fioravante; Ronaldo S. Nunes; Heloisa A. Acciari; Eduardo N. Codaro

Illustration of the cross section of an oil pipeline showing the scale formed by sweet corrosion.


Published online: April 8, 2019.

Articles J. Braz. Chem. Soc. 2019

Caryopristimerin, the First Example of a Sesquiterpene-Triterpene Homo Diels‑Alder Adduct, and a New 29-nor-Friedelane from Roots of Salacia crassifolia

Josana P. dos Santos; Bernardo L. Rodrigues; Willian X. C. Oliveira ; Fernando C. Silva; Grasiely F. de Sousa ; Sidney A. Vieira Filho; Lucienir P. Duarte ; Roqueline R. Silva

Two new compounds, caryopristimerin and 2α,3α,22β-trihydroxy-21-oxo-29-nor-friedelan-24-oic acid, were isolated from Salacia crassifolia roots. This is the first report of a dimer formed with a quinonemethide-derivative and the sesquiterpene caryophyllene (caryopristimerin) linked by carbon-carbon bonds possibly via homo Diels-Alder reaction.


Published online: April 4, 2019.

J. Braz. Chem. Soc. 2019

4D-QSAR Study of 17β-Hydroxysteroid Dehydrogenase Type 3 Inhibitors

João Paulo A. Martins ; Eduardo B. de Melo

4D-quantitative structure-activity relationships (QSAR) models obtained from conformational sampling profiles derived by molecular dynamics.


Published online: April 1, 2019.

J. Braz. Chem. Soc. 2019

BDD-Electrolysis of Oxalic Acid in Diluted Acidic Solutions

Tamires F. da Costa; José E. L. Santos; Djalma R. da Silva; Carlos A. Martínez‑Huitle

The effect of supporting electrolyte concentration as well as the role of oxidants in solution play an important role in the chemical/electrochemical process at the molecular level (electron-transfer, solvation, diffusion, adsorption species) at boron-doped diamond (BDD) surface.


Published online: March 29, 2019.

J. Braz. Chem. Soc. 2019

Solid Phase Extraction Using SiO2/Al2O3/TiO2 Ternary Oxide for Cu2+ Preconcentration

Evelyn F. Pinheiro; José Guilherme A. Rodrigues; Gláucio G. Honório; Jéssica N. da Cunha; Carlos Eduardo R. de Paula; Débora F. de Andrade; Emerson S. Ribeiro ; Eliane D'Elia

A SiO2/Al2O3/TiO2 ternary mixed oxides was used to study in preconcentration/separation for Cu2+ determination in cachaça samples by square wave anodic stripping voltammetry.


Published online: March 29, 2019.

J. Braz. Chem. Soc. 2019

An Alternative and Simple Method for the Preparation of Bare Silica Nanoparticles Using Sugarcane Waste Ash, an Abundant and Despised Residue in the Brazilian Industry

Suzimara Rovani ; Jonnatan J. Santos; Paola Corio; Denise A. Fungaro

Bare silica nanoparticles were successfully synthesized from sugarcane waste ash; the particles are smaller than 100 nm and have a surface area of 63 m2 g-1.


Published online: March 27, 2019.

J. Braz. Chem. Soc. 2019

Advanced Oxidation Processes to the Remediation of Liquid Residue from the Thermal Treatment of Oily Sludge

Graziela S. Costa; Christine A. Althoff; Jéssica T. Schneider; Patricio Peralta-Zamora

The thermal treatment of the oily sludge produces three new residues. This study aims to remediate the liquid residue applying advanced oxidative processes.


Published online: March 27, 2019.

J. Braz. Chem. Soc. 2019

Optimizing the Extraction of Anthocyanins from the Skin and Phenolic Compounds from the Seed of Jabuticaba Fruits (Myrciaria jaboticaba (Vell.) O. Berg) with Ternary Mixture Experimental Designs

Michelly C. Paludo; Ronan C. Colombo; José Teixeira Filho; Isidro Hermosín‑Gutiérrez; Cristiano A. Ballus; Helena T. Godoy

Extraction protocols for phenolic compounds from the seed and total monomeric anthocyanins from the skin of "Sabará" jabuticaba (SF) were optimized with simplex lattice designs for solvent mixing. Both optimized extraction protocols proved to be fast, simple, and low cost.


Published online: March 26, 2019.

J. Braz. Chem. Soc. 2019

Determination of Antibiotics Residues in Milk Using a QuEChERS Method Using Full Factorial Design and Liquid Chromatography-Tandem Mass Spectrometry

Andressa H. A. Grabsk; João Raul B. de Souza; Francilaine E. De Marchi; Rodolpho M. do Prado; Geraldo T. dos Santos; Carla Porto; Eduardo J. Pilau

Determination of ceftiofur, cloxacillin and enrofloxacin in cow milk by optimized quick, easy, cheap, effective, rugged and safe (QuEChERS) methodology.


Published online: March 26, 2019.

J. Braz. Chem. Soc. 2019

Evaluation of the Lipid Quality of Lyophilized Pasteurized Human Milk for Six Months by GC-FID and ESI-MS

Luciana P. Manin ; Adriela A. Rydlewski ; Marília B. Galuch ; Jessica S. Pizzo ; Caroline D. Zappielo ; Carlos E. R. Senes; Oscar O. Santos ; Jesuí V. Visentainer

The study of the lipid stability of lyophilized human milk is very important for human milk banks. This study presents the values of acidity, fat content, composition of fatty acids and triacylglycerols profile of lyophilized human milk at times 0, 30, 60, 90, 120, 150 and 180 days of storage.


Published online: March 25, 2019.

J. Braz. Chem. Soc. 2019

A Microwave-Enhanced Synthesis and Biological Evaluation of N-Aryl‑5,6,7,8‑tetrahydrobenzo[4,5]thieno[2,3-d]pyrimidin-4-amines

Qing Han ; Zijian Yin; Jingjiao Sui; Qingming Wang; Yaquan Sun

A series of thieno[2,3-d]pyrimidin-4-amine derivatives were synthesized by using a microwave-enhanced conditions. Amongst these compounds, three exhibited moderate cytotoxic activities against A549, CT26 and HepG2 cell lines.


Published online: March 19, 2019.

J. Braz. Chem. Soc. 2019

When Serendipity Knocks on the Door: Synthesis and Physicochemical Characterization of 7-Chloro-2,3-dihydro-5H-thiazolo[3,2-a]pyrimidin-5-one

Christian C. Carmona-Vargas ; Javier Ellena ; Richard F. D'Vries ; Manuel N. Chaur

7-Chloro-2,3-dihydro-5H-thiazolo[3,2-a]pyrimidin-5-one was obtained in a serendipitous way in a chlorination reaction of a thiobarbituric acid derivative.


Published online: March 19, 2019.

J. Braz. Chem. Soc. 2019

Determination of Coconut Oil Adulteration with Soybean Oil by Direct Infusion Electrospray Ionization Mass Spectrometry

Jessica S. Pizzo ; Marília B. Galuch ; Patrícia D. S. Santos; Luciana P. Manin ; Caroline D. Zappielo ; Orivaldo J. Silva Filho; Oscar O. Santos ; Jesuí V. Visentainer

Coconut oil is used domestically because of its health benefits. Nevertheless, it is a high-cost material and it has been subject to adulterations with lower price oils and fats. This study reports a fast, simple and conclusive methodology to detect low quantities of intentionally adulterated coconut oil with soybean oil.


Published online: March 14, 2019.

J. Braz. Chem. Soc. 2019

Ligand and Solvent Effects on the Structural and Optical Properties of Au13L83+ Clusters: a Density Functional Theory Study

Edna S. Machado ; Nailton M. Rodrigues; Marcus V. A. Prado; José D. L. Dutra; Nivan B. da Costa Júnior; Viviane C. Felicíssimo

Optical absorption spectra in gas phase and in solvents of different polarities for Au13L83+.


Published online: March 12, 2019.

J. Braz. Chem. Soc. 2019

Fluoroquinolones in Hospital Wastewater: Analytical Method, Occurrence, Treatment with Ozone and Residual Antimicrobial Activity Evaluation

Caio Rodrigues-Silva ; Rafael S. Porto; Sabrina G. dos Santos; Jerusa Schneider; Susanne Rath

Fluoroquinolones were detected in wastewater samples (up to 34 ng mL-1). Ozonation can remove antimicrobial activity from these samples.


Published online: March 8, 2019.

J. Braz. Chem. Soc. 2019

Assessing the Spatial Distribution of Key Flavonoids in Mentha × piperita Leaves: An Application of Desorption Electrospray Ionization Mass Spectrometry Imaging (DESI-MSI)

Julia R. L. e Freitas; Pedro H. Vendramini; Júlio O. F. Melo ; Marcos N. Eberlin; Rodinei Augusti

Desorption electrospray ionization mass spectrometry imaging (DESI-MSI) was used to assess the spatial distribution of some key flavonoids in peppermint (Mentha × piperita L.) leaves.


Published online: March 8, 2019.

J. Braz. Chem. Soc. 2019

Synthesis and Biological Evaluation of New Eugenol-Derived 1,2,3-Triazoles as Antimycobacterial Agents

Thiago dos Santos; Camila M. Coelho ; Thiago C. Elias; Fallon S. Siqueira; Eloísa S. S. D. Nora; Marli M. A. de Campos; Gabriel A. P. de Souza; Luiz F. L. Coelho; Diogo T. Carvalho

Sixteen eugenol-derived 1,2,3-triazoles were synthesized and evaluated against rapid growing mycobacteria of difficult clinical management.


Published online: March 6, 2019.

J. Braz. Chem. Soc. 2019

Characterization and in silico Mutagenic Assessment of a New Betahistine Degradation Impurity

Murilo B. M. de Mello; Antonio A. F. de Oliveira; Caroline L. de Oliveira; Mariah A. Ultramari; Fernando H. S. Gama; Alessandra Mascarello; Cristiano R. W. Guimarães; Miller N. de Freitas; Carlos E. Cunha; Tiago C. Lourenço; Fernanda P. Ferreira; João L. C. Lopes; Giuliano C. Clososki

Systematic investigation of a forced degradation sample led to the characterization of a new betahistine impurity.


Published online: March 1, 2019.

J. Braz. Chem. Soc. 2019

Determination of Plant Growth Regulators in Chinese Herbal Medicine: A Comparison of Liquid (QuEChERS) and Solid (MSPD) Extraction Methods

Bingjun Han ; Bing Qian; Yan He; Lixu Peng

Quick, easy, cheap, effective, rugged and safe (QuEChERS) and matrix solid-phase dispersion (MSPD) methods were chosen and compared for the determination of the plant growth regulators in Chinese herbal medicines.


Published online: February 28, 2019.

J. Braz. Chem. Soc. 2019

A Comparative Study on Chemical Composition, Antileishmanial and Cytotoxic Activities of the Essential Oils from Leaves of Guarea macrophylla (Meliaceae) from Two Different Regions of São Paulo State, Brazil, Using Multivariate Statistical Analysis

Emerson A. Oliveira; Euder G. A. Martins; Marisi G. Soares; Daniela A. Chagas‑Paula; Luiz F. D. Passero; Patricia Sartorelli; João L. Baldim; João Henrique G. Lago

A study on chemical composition, antileishmanial and cytotoxic activities of the essential oils from leaves of Guarea macrophylla (Meliaceae) using multivariate statistical analysis was performed in the present work.


Published online: February 27, 2019.

J. Braz. Chem. Soc. 2019

Design, Synthesis, Trypanocidal Activity, and Studies on Human Albumin Interaction of Novel S-Alkyl-1,2,4-triazoles

Tatiany N. Franklim; Leonardo Freire-de-Lima; Otávio A. Chaves; Isabel F. LaRocque-de-Freitas; Joana D. da Silva-Trindade; José C. Netto‑Ferreira; Célio G. Freire-de-Lima; Debora Decoté-Ricardo; José O. Previato; Lucia Mendonça‑Previato; Marco E. F. de Lima

A series of eight new 1,2,4-triazoles derived from natural piperine was synthesized. Three compounds showed the best profile of toxic effects against T. cruzi, comparable to that obtained to benznidazole.


Published online: February 26, 2019.

J. Braz. Chem. Soc. 2019

Maturation and Maceration Effects on Tropical Red Wines Assessed by Chromatography and Analysis of Variance - Principal Component Analysis

Janaína A. Barbará; Érica A. S. Silva; Aline C. T. Biasoto; Adriano A. Gomes; Luiz C. Correa; Patrícia C. S. Leão; Cláudia A. Zini

Different experimental conditions were tested in the elaboration of Syrah wines. Wines produced from riper grapes and macerated over longer periods were richer in volatiles with pleasant aromas and phenolics that are known to provide sensory characteristics appropriate to wine.


Published online: February 25, 2019.

J. Braz. Chem. Soc. 2019

Determination of Short Chain Fatty Acids in Mice Feces by Capillary Electrophoresis

Letícia A. Marques; Cinthia B. B. Cazarin; Juliano Bicas; Mário R. Maróstica Junior; Emanuel Carrilho; Stanislau Bogusz Junior

Short-chain fatty acids (SCFA) are enteric end-products essential to health. Quantification of SCFA in a small amount of mice feces sample is a big challenge. We developed, validated and applied a method based on capillary electrophoretic with indirect ultraviolet detection for determination of SCFA in mouse feces to evaluate the effect of the consumption of aqueous extract of jabuticaba on mice with induced colitis.


Published online: February 21, 2019.

J. Braz. Chem. Soc. 2019

Gold Supported on Strontium Surface-Enriched CoFe2O4 Nanoparticles: a Strategy for the Selective Oxidation of Benzyl Alcohol

Laise N. S. Pereira; Carlos E. S. Ribeiro; Aryane Tofanello; Jean C. S. Costa; Carla V. R. de Moura ; Marco A. S. Garcia; Edmilson M. de Moura

This paper deals with the interaction between Sr(OH)2 and CoFe2O4 and their role in the oxidation reaction of benzyl alcohol with gold nanoparticles.


Published online: February 20, 2019.

J. Braz. Chem. Soc. 2019

Automatized Separation of Fractions from Petroleum Based on Spectrophotometric Signal Derivative Using Open-Source Hardware for the Determination of Ni and V Linked to Porphyrins

Daniel M. Silva; Álvaro J. Pereira; Tatiana D. Saint'Pierre; Pierre M. Esteves ; Anderson A. Rocha ; Rainério Escalfoni Jr.; Christiane Duyck

Open-source device based on Arduino for separation of porphyrins fractions from crude oil is presented and successfully tested.


Published online: February 20, 2019.

Review J. Braz. Chem. Soc. 2019

Perspectives and Applications of Natural Products as Civilian Defense Devices

Ananda S. Antonio ; Gabriel D. Fonseca; Álvaro J. B. Mendes; Larissa S. M. Wiedemann; Valdir F. Veiga-Junior

Capsaicin, piperine, gingerol and other pungent natural compounds are technologically developed bioproducts for civilian's self-defense proposes.


Published online: February 19, 2019.

Articles J. Braz. Chem. Soc. 2019

Fatty Acid Determination in Fermented Milk Samples Employing Direct Esterification and Gas Chromatography

Angélica F. B. Piccioli ; Patrícia D. S. Santos; Roberta da Silveira; Elton Bonafé; Jesuí V. Visentainer; Oscar O. Santos

A fast and simple analytical method was developed for the determination of fatty acid in fermented milk samples employing direct esterification and gas chromatography.


Published online: February 19, 2019.

J. Braz. Chem. Soc. 2019

Semiconductor Nanocrystals-Reduced Graphene Composites for the Electrochemical Detection of Carbendazim

Paula C. A. Santana; Jéssica B. S. Lima; Tiago B. S. Santana; Luís F. S. Santos; Charlene R. S. Matos; Luiz P. da Costa; Iara F. Gimenez ; Eliana M. Sussuchi

A new nanocomposite based on ZnCdTe semiconductor nanocrystals synthesized in situ on reduced graphene oxide (rGO) was obtained. The modified electrodes were prepared and successfully applied for the determination of carbendazim in orange juice samples.


Published online: February 12, 2019.

J. Braz. Chem. Soc. 2019

A Procedure for Assessment of the Reducing Capacity of Plants-Derived Beverages Based on the Formation of the FeII/2,2'-Bipyridine Complex

Rafaela L. Sacchi; Waila E. L. Santana; Cecilia V. Nunez; Horacio D. Moya

In the present study the reduction reaction of FeIII to FeII in aqueous solution containing 2,2'-bipyridine (pH 4.6; acetate buffer) was used as an alternative spectrophotometric method to measure the total reducing capacity of teas and herbs. The method suggested here is fast, simple, reliable and easy to perform.


Published online: February 12, 2019.

J. Braz. Chem. Soc. 2019

Simultaneous Determination of 2,3,7,8-TCDD and 2,3,7,8-TCDF in Water Samples by LLE-LTP and HPLC-DAD

Lázaro C. Sicupira; João P. F. Tiago; Gevany P. de Pinho; Flaviano O. Silvério

The image represents liquid-liquid extraction with low-temperature partition (LLE-LTP) methodology combined with high-performance liquid chromatography coupled a diode array detector (HPLC-DAD) used in the present study.


Published online: February 7, 2019.

Short Report J. Braz. Chem. Soc. 2019

Synthesis and Antileishmanial Activity of Some Functionalized Peptoids

Daniel Previdi; Stephanie Rodrigues; Mike G. Coelho; Ana Carolina B. B. Candido; Lizandra G. Magalhães; Paulo M. Donate

This paper describes the microwave-assisted synthesis of thirteen functionalized peptoids and evaluates their in vitro antileishmanial activity against Leishmania (Leishmania) amazonensis promastigotes.


Published online: February 7, 2019.

Articles J. Braz. Chem. Soc. 2019

NMR-Based Metabolomic Screening for Metabolites Associated with Resistance to Meloidogyne javanica in Annona muricata Roots

Alan R. T. Machado; Felipe S. Medeiros; José D. de Souza Filho; Marcelo M. Sena; Willian C. Terra; Lúcia P. S. Pimenta

Induced and pre-formed mechanism defense of Annona muricata against Meloidogyne javanica were detected by nuclear magnetic resonance (NMR)-based metabolomic analysis.


Published online: February 7, 2019.

J. Braz. Chem. Soc. 2019

Synthesis of Hydrotalcite-Supported CdTe Semiconductor Nanocrystals for Electrochemical Detection of Ciprofloxacin

Sanny W. M. M. Carvalho; Tiago B. S. Santana; Charlene R. S. Matos; Luiz P. Costa; Eliana M. Sussuchi; Iara F. Gimenez

Stable CdTe nanocrystals were prepared in a single step route onto the surface of layered double hydroxide as modifier to carbon paste electrodes.


Published online: February 7, 2019.

J. Braz. Chem. Soc. 2019

Reduction of Aqueous Ag+ Steered by Electrochemical Plasma: Connecting the Bulk pH Variation with the Reaction Pathways for Hydrated Electrons

Ingrid A. Gonçalves; Jairo Barauna; Fernando J. Cunha-Filho; Osvaldo Chiavone-Filho; Jussier O. Vitoriano; Clodomiro Alves Júnior; Andressa Mota-Lima

The fast acidification promoted by a discharge in nitrogen-based gas phase interferes in the nanoparticles (NP) formation; hydrated electrons induced by an electrochemical discharge are competitively consumed through scavenger reaction (silver reduction) and through the second-order recombination reaction; fact that could only be perceived for discharge in the helium because NP formation and basification are simultaneously observed.


Published online: February 6, 2019.

J. Braz. Chem. Soc. 2019

Model Molecules for Evaluating Asphaltene Precipitation Onset of Crude Oils

Rita C. P. Nunes; Michel R. T. Valle; William R. D. Reis; Thiago M. Aversa; Sofia D. Filipakis; Elizabete F. Lucas

The asphaltenes precipitation onset point of crude oil samples that do not have well-defined curves can be ascertained by adding a solution of toluene containing an additive.


Published online: February 5, 2019.

J. Braz. Chem. Soc. 2019

Determination of Phenolic Compounds in Red Sweet Pepper (Capsicum annuum L.) using a Modified QuEChERS Method and UHPLC-MS/MS Analysis and Its Relation to Antioxidant Activity

Carina A. Rodrigues ; Antonio E. Nicácio; Isabel C. S. F. Jardim; Jesuí V. Visentainer; Liane Maldaner

A fast, easy and efficient analytical method based on a modified quick, easy, cheap, effective, rugged and safe (QuEChERS) method and ultra-high performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS) analysis was developed and validated for the determination of phenolic compounds in red sweet pepper.


Published online: February 5, 2019.

J. Braz. Chem. Soc. 2019

Electrochemiluminescence Detection of Silver Ion Based on Trigeminal Structure of DNA

Zhejian Li ; Xuemei Fan; Baoyue Cao; Fei Yuan; Fengying Chen; Shumin Wang

A novel electrochemiluminescence sensor for highly sensitive detection of Ag+ is developed based on the sensitive "turn-on" three-way junction of deoxyribonucleic acid (DNA).


Published online: February 5, 2019.

J. Braz. Chem. Soc. 2019

Assessment of a Fully Optimized DPX-Based Procedure for the Multiclass Determination of Pesticides in Drinking Water Using High-Performance Liquid Chromatography with Diode Array Detection

Gabriela Corazza; Josias Merib; Sângela N. do Carmo; Leila D. Mendes; Eduardo Carasek

Disposable pipette extraction (DPX)-based procedure was fully optimized for determination of multiclass of pesticides in 20 drinking water samples by high-performance liquid chromatography coupled with diode array detection (HPLC-DAD).


Published online: February 4, 2019.

J. Braz. Chem. Soc. 2019

A Deep Eutectic Solvent as an Extraction Solvent to Separate and Preconcentrate Parabens in Water Samples Using in situ Liquid-Liquid Microextraction

Dandan Ge ; Ying Wang; Qian Jiang; Enrui Dai

In situ deep eutectic solvent liquid-liquid microextraction method was developed as a sample preparation method for the detection of parabens. The deep eutectic solvent, formed in situ by the DL-menthol and decanoic acid, was used as the microextraction solvent.


Published online: January 30, 2019.

J. Braz. Chem. Soc. 2019

Streamlined Synthesis of 6-((1H-1,2,3-Triazol-4-yl)methyl)-1H-pyrrolo [3,4-d]pyridazin-1-one System via Sequential N-Alkylation, CuAAC, and [4 + 2] Cyclization Reactions

Helio G. Bonacorso ; Hernane T. Magalhães; Gean M. Dal Forno; Francieli M. Libero; Manfredo Hoerner; Clarissa P. Frizzo; Marcos A. P. Martins; Nilo Zanatta

Useful synthesis of pyrrolo[3,4-d]pyridazin-1-ones by sequential N-alkylation, CuAAC and [4 + 2] cyclocondensation reactions.


Published online: January 29, 2019.

J. Braz. Chem. Soc. 2019

Ferulate Anion Intercalated into Zn/Al Layered Double Hydroxide: A Promising Intercalation Compound for Inhibition of Leishmania (L.) amazonensis

Robson Sousa; Bruno J. M. Da Silva; Amarílis A. Dias; Carla C. F. Meneses; Beatriz A. Bentes; Edilene O. Silva; Cláudio M. R. Remédios; Waldeci P. Feio; Olivier Masson; Cláudio N. Alves; Mara M. S. P. Arruda; Jerônimo Lameira

Synthesis, physicochemical characterization and leishmanicidal activity of the layered double hydroxide (LDH)-ferulate anion (FER-) intercalation compound, a potential drug delivery vehicle for potential treatment of cutaneous leishmaniasis without any side effect.


Published online: January 24, 2019.

J. Braz. Chem. Soc. 2019

DFT Study of The Interaction between the Ni2+ and Zn2+ Metal Cations and The 1,2-Dithiolene Ligands: Electronic, Geometric and Energetic Analysis

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

The affinity between the Zn2+ and Ni2+ metal cations and 1,2-dithiolene ligands was quantified from the substitution energies and rationalized through energetic, electronic and geometric parameters.


Published online: January 23, 2019.

J. Braz. Chem. Soc. 2019

Human Metabolism of The Anabolic Steroid Methasterone: Detection and Kinetic Excretion of New Phase I Urinary Metabolites and Investigation of Phase II Metabolism by GC-MS and UPLC-MS/MS

Wendell S. Magalhães ; Bruno C. Garrido; Gustavo A. Cavalcanti; Monica C. Padilha; Alessandro Casilli; Henrique M. G. Pereira; Francisco R. de Aquino Neto

The phase I and II metabolism of methasterone, a designer anabolic steroid prohibited for athletes and monitored by anti-doping laboratories, were studied by chromatographic techniques using human urine samples. One new metabolite is shown: 17β-hydroxy-2α,17α-dimethyl-5β-androstan-3-one, obtained from the epimerization at C5


Published online: January 22, 2019.

J. Braz. Chem. Soc. 2019

A Complete and Unambiguous 1H and 13C NMR Signals Assignment of para-Naphthoquinones, ortho- and para-Furanonaphthoquinones

Tatiane F. Borgati ; José D. de Souza Filho; Alaíde B. de Oliveira

This is the first report distinguishing para-naphthoquinones, ortho- and para- furanonaphthoquinones by one and two-dimensional techniques of nuclear magnetic resonance (NMR).


Published online: January 17, 2019.

J. Braz. Chem. Soc. 2019

Determination of L-Ascorbic Acid in Milk by Ultra-High-Performance Liquid Chromatography Coupled to Tandem Mass Spectrometry Analysis

Caroline D. Zappielo ; Antonio E. Nicácio; Luciana P. Manin; Liane Maldaner; Jesuí V. Visentainer

This study presented the development of a fast and accurate method for determination of L-ascorbic acid (L-AA) in different milk samples (raw and processed). In the sample preparation, a low toxicity organic solvent was used in the degreasing and deproteinization step, avoiding L-AA oxidation.


Published online: January 11, 2019.

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