3:04, Sat May 26

Open Access/APCs

Forthcoming Papers - 2018

Articles published online ahead of print

Articles J. Braz. Chem. Soc. 2018

Study of the Naphthenic Corrosion of AISI 316 and AISI 1020 Steels by Light, Scanning Electron and Atomic Force Microscopies (LM, SEM and AFM)

Débora V. Domingos; Fabrício C. Tozzi; Eliane V. Barros; Fernanda E. Pinto; Cristina M. S. Sad; Paulo R. Filgueiras; Valdemar Lacerda Jr.; Heloisa P. Dias; Glória M. V. F. Aquije; Wanderson Romão

AISI 316 and AISI 1020 steel coupons were analyzed by scanning electron microscopy (SEM) and atomic force microscopy (AFM) before and after immersion in various crude oil samples and their respective blends for 48 days at room temperature.


Published online: May 25, 2018.

J. Braz. Chem. Soc. 2018

Effect of Calcination Temperature on Catalytic Performance of CeCu Oxide in Removal of Quinoline by Wet Hydrogen Peroxide Oxidation from Water

Zhaojie Jiao; Guilin Zhou; Haidong Zhang; Yu Shen; Xianming Zhang; Juexuan Li; Xu Gao

The CeCu-mixed oxide catalyst calcinated at temperature of 650 °C took on the best performance with an oxidation conversion up to 98% for quinoline, a removal efficiency of 80.6% for total organic carbon (TOC) and a low Cu2+ leaching value of 19.3 mg L-1.


Published online: May 25, 2018.

J. Braz. Chem. Soc. 2018

Air Quality in the Maracanã and Deodoro Zones During the Rio 2016 Olympic Games

Carolina A. Bezerra; Nicole J. de Carvalho; Claudio G. P. Geraldino; Cleyton M. da Silva; Graciela Arbilla

C4-C12 non-oxygenated volatile organic compounds and criteria pollutants were analyzed during the Rio de Janeiro Summer 2016 Olympic Games, in two Olympic zones, Maracanã (Tijuca) and Deodoro.


Published online: May 22, 2018.

Communication J. Braz. Chem. Soc. 2018

Chemo-Preventive Functions of Grape Seed Proanthocyanidin Extract against UV‑Induced Intracellular Oxidative Stress and Tyrosinase Activity

Lei Shi; Hua-Lin Tang; Su-Ling Xu

Grape seed proanthocyanidin extract regulates the intracellular reactive oxidative stress and tyrosinase activity originated from UV exposure.


Published online: May 22, 2018.

Articles J. Braz. Chem. Soc. 2018

Synthesis, Characterization and Preliminary Study on Acetylpyrazine N(4)Butylthiosemicarbazone as a Potential CDK2 Inhibitor Combined with DFT Calculations

Erna Normaya; Mohammad N. Ahmad; Yang Farina; Ku H. K. Bulat

The graphical abstract shows the 3D plots of molecular electrostatic potential of optimized structure and the interaction of acetylpyrazine N(4)butylthiosemicarbazone (APBT) with amino acid residues in cyclin-dependent kinase 2 (CDK2) macromolecule. Calculation within the grid box size of 30 × 30 × 30 Å3 showed the formation of stable complex with binding affinity value of -6.4 kcal mol-1.


Published online: May 18, 2018.

Short Report J. Braz. Chem. Soc. 2018

Degradation Products of Lambda-Cyhalothrin in Aqueous Solution as Determined by SBSE-GC-IT-MS

Renata Colombo; Janete H. Yariwake; Marcos R. V. Lanza

Lambda-cyhalothrin derivative products were identified by stir bar sorptive extraction and gas chromatography using liquid and thermal desorption.


Published online: May 18, 2018.

Articles J. Braz. Chem. Soc. 2018

Use of Constrained Mixture Design in the Optimization of a Method Based on Extraction Induced by Emulsion Breaking for the Determination of Ca, Mg, Mn, Fe and Zn from Palm Oil by Flame Atomic Absorption Spectrometry

Gisseli S. Valasques; Ana M. P. dos Santos; Darllen G. da Silva; Juscelia P. S. Alves; Marcos A. Bezerra

Constrained mixture design was used in the development of a method for Ca, Mg, Mn, Fe and Zn determination from palm oil samples.


Published online: May 15, 2018.

J. Braz. Chem. Soc. 2018

Organophosphorus Pesticide in Sapodilla (Manilkara zapota) Fruit

Daniel B. Alcântara; Mario S. O. Paz; Tigressa H. S. Rodrigues; Tatiana S. M. Fernandes; Pablo G. A. Barbosa; Adonay R. Loiola; Patricia Grinberg; Guilherme J. Zocolo; Edy S. de Brito; Ronaldo F. do Nascimento

A methodology for the determination of organophosphorus pesticides in sapodilla fruit based on QuEChERS (quick, easy, cheap, effective, rugged, and safe) extraction and gas chromatography-mass spectrometry (GC-MS) detection is described. Strong matrix effects could be observed and was overcome with the use of matrix match calibration. Chlorpyrifos, a level II toxic compound, was found in several commercial samples.


Published online: May 14, 2018.

J. Braz. Chem. Soc. 2018

Effect of Temperature on Devulcanization of Waste Sidewall Rubber by Supercritical Ethanol

Xiang Li; Xiao-Qing Deng; Chao Dong

In the low temperature (LT) region, the devulcanization happened due to the breakage of crosslinked bonds. Supercritical ethanol beyond the critical temperatures (medium temperatures (MT) and high temperatures (HT)) could strongly promote the devulcanizing reaction; the breakage of main chains predominated in the devulcanizing process. The devulcanizing reaction rate of natural rubber was faster than that of butadiene rubber.


Published online: May 14, 2018.

J. Braz. Chem. Soc. 2018

Wax Behavior in Crude Oils by Pour Point Analyses

Lize M. S. L. Oliveira; Rita C. P. Nunes; Ygor L. L. Ribeiro; Dayane M. Coutinho; Débora A. Azevedo; Júlio C. M. Dias; Elizabete F. Lucas

Two-dimensional gas chromatography of a crude oil sample.


Published online: May 11, 2018.

Communication J. Braz. Chem. Soc. 2018

Arsenic Speciation in Fish and Rice by HPLC-ICP-MS Using Salt Gradient Elution

Raquel Nogueira; Evyson A. Melo; Jefferson L. C. Figueiredo; Jéssica J. Santos; Antonio P. do Nascimento Neto

AsB, DMA, AsIII, MMA and AsV in rice and fish were separated in 15 min by high-performance liquid chromatography with inductively coupled plasma-mass spectrometer (HPLC-ICP-MS) using an Agilent Bio SAX column and salt gradient elution.


Published online: May 11, 2018.

Articles J. Braz. Chem. Soc. 2018

Multiple-Injection Capillary Zone Electrophoresis as a Fast Strategy to Determine Antinitrosating Capacity of Commercial Teas

Ana P. Ruani; Luciano Vitali; Gustavo A. Micke

A multiple-injection capillary electrophoresis method was developed to determine antinitrosating capacity of nine commercial teas through nitrite quantification.


Published online: May 10, 2018.

J. Braz. Chem. Soc. 2018

Preparation, Characterization and Catalytic Activity of Palladium Catalyst Supported on MgCO3 for Dynamic Kinetic Resolution of Amines

Marina M. M. Ferreira; Camila R. Cabreira; Pedro H. K. Chaves; Gabriela M. Labussiére; Renata C. Zimpeck; Sania M. de Lima; Fernanda A. de Siqueira

This paper reports the preparation of Pd/MgCO3. The composition and size particle were obtained by X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. The catalytic activity was studied for racemization of (S)-(-)-1-phenylethylamine and dynamic kinetic resolution (DKR) of a series of primary amines.


Published online: May 7, 2018.

J. Braz. Chem. Soc. 2018

Determination of Estrogens in Milk Using Polypyrrole Fiber-Mediated Solid-Phase Extraction Followed by High Performance Liquid Chromatography

Lanlan Wei; Yan Yan; Jianjun Deng; Yuqin Ma; Yu Wang; Xiaoxiao Wu; Xuejun Kang

The schematic representation of packed-fiber solid-phase extraction (PFSPE) device and the determination method proposed in this paper.


Published online: April 27, 2018.

J. Braz. Chem. Soc. 2018

Metal Organic Frameworks for Selective Degradation of Amoxicillin in Biomedical Wastes

Marcos V. Paula; Amanda L. Barros; Kaline A. Wanderley; Gilberto F. de Sá; Marcos Eberlin; Thereza A. Soares; Severino Alves Jr.

Molecular docking calculations predict the adsorption of widely used antibiotic amoxicillin, but not gentamicin, to the Zn-based metal organic frameworks zeolitic imidazolate framework-8 (ZIF-8) and Zn(1,4-benzenedicarboxylate) (ZnBDC). Mass spectrometry measurements further demonstrate the degradation of amoxicillin upon contact with the Zn-containing frameworks.


Published online: April 26, 2018.

J. Braz. Chem. Soc. 2018

Evaluation of the Suitability of Analytical Methods in Trichothecene A and B Degradation

Ana Carla P. Feltrin; Karen V. M. Sibaja; Cíntia Tusnski; Sergiane S. Caldas; Ednei G. Primel; Jaqueline Garda‑Buffon

Analytical methods were applied in trichothecenes degradation by enzymatic action resulting in a reduction of 68.4% for DON (deoxynivalenol), 45.4% for 15-ADON (15-acetyldeoxynivalenol), 50.2% for 3-ADON (3-acetyldeoxynivalenol) and 12.3% for T-2 toxin.


Published online: April 24, 2018.

J. Braz. Chem. Soc. 2018

Binary Solvent Dispersive Liquid-Liquid Microextraction for the Determination of Pesticides in Natural Water Samples

Priscila L. S. Estevão; Patricio Peralta-Zamora; Noemi Nagata

The binary solvent dispersive liquid-liquid microextraction was used for the simultaneous quantification of pesticides with a broad polarity range.


Published online: April 18, 2018.

J. Braz. Chem. Soc. 2018

Amperometric Electrochemical Platform for Hydrazine Determination Exploiting Reduced Graphene Oxide, Co(Salophen) and DNA: Application in Pharmaceutical Formulations Samples

Ludymila V. Freitas; Kayni C. M. S. Lima; Saimon M. Silva; Fernando R. F. Leite; Ridvan N. Fernandes; Wallans T. P. Santos; Flavio S. Damos; Rita C. S. Luz

Oxidation of hydrazine on the rGO/Co(Salophen)DNA modified electrode and cyclic voltammograms for the oxidation of hydrazine on the unmodified glassy carbon electrode (red voltammogram) and rGO/Co(Salophen)DNA modified glassy carbon electrode.


Published online: April 18, 2018.

J. Braz. Chem. Soc. 2018

Extraction and Characterization of Passion Fruit and Guava Oils from Industrial Residual Seeds and Their Application as Biofuels

Osvaldo K. Iha; Guilherme B. C. Martins; Erick Ehlert; Mateus A. Montenegro; Renata R. Sucupira; Paulo A. Z. Suarez

Guava and passion fruit waste generated by the juice industry were taken and treated to obtain the seed oils, which were characterized and used to produce biofuels.


Published online: April 17, 2018.

J. Braz. Chem. Soc. 2018

Physicochemical Characterization of a Crude Anthocyanin Extract from the Fruits of Jussara (Euterpe edulis Martius): Potential for Food and Pharmaceutical Applications

Laura I. L. Favaro; Victor M. Balcão; Liliam K. H. Rocha; Erica C. Silva; José M. Oliveira Jr; Marta M. D. C. Vila; Matthieu Tubino

Anthocyanins are attracting the interest of researchers and industry due to potential as a coloring agent and beneficial effects for health. The crude anthocyanin extract produced exhibited slight antimicrobial activity against Staphylococcus aureus, strong antioxidant activity and generalized amorphous behavior.


Published online: April 16, 2018.

J. Braz. Chem. Soc. 2018

Synthesis and Characterization of Newly Fused 1,2-Dihydropyrido[3,4-b], Bridged Oxadiazol-2-yl, 4-Substituted-benzylidene Hydrazide and Arylidene 6-Chloroquinoxaline 1,4-Dioxides

Samy B. Said; Fawzia Z. El-Ablack; Hani M. Elbeheiry

Some new unexpected arylidene and fused heterocyclic 6-chloroquinoxaline 1,4-dioxide are synthesized from the precursor 6-chloro-3-(ethoxycarbonyl)-2-methylquinoxaline 1,4-dioxide.


Published online: April 16, 2018.

J. Braz. Chem. Soc. 2018

Electrical Immunosensor Made with Antigenic Peptide NS5A‑1 Immobilized onto Silk Fibroin for Diagnosing Hepatitis C

Lais R. Lima; Alem-Mar B. Gonçalves; Fernando V. Paulovich; Osvaldo N. Oliveira Jr.; Sidney J. L. Ribeiro; Marli L. Moraes

Electrical response of the immunosensor solutions containing the specific antibody anti-hepatitis C virus (HCV) could be clearly distinguished and for unspecific antibody anti-human immunodeficiency virus (HIV) no significant change has been observed.


Published online: April 16, 2018.

J. Braz. Chem. Soc. 2018

Determination of 4-Nonylphenol in Surface Waters of the Guandu River Basin by High Performance Liquid Chromatography with Ultraviolet Detection

Frederico G. de Araujo; Glauco F. Bauerfeldt; Yara P. Cid

Solid-phase extraction and liquid chromatography coupled with an ultraviolet detector were used for the detection and quantification of 4-nonylphenol in samples of surface water collected in the basin of the Guandu River.


Published online: April 13, 2018.

J. Braz. Chem. Soc. 2018

Nature of Insoluble Material Found in the Bottom of Soybean Biodiesel Storage Tank: Chemical and Microbiological Approach

Juciana C. Cazarolli; Gabriela Boelter; Amanda M. D. L. de Lima; Thaisa Hengles; Camila Correa; Maria C. R. Peralba; Marco F. Ferrão; Eduardo H. S. Cavalcanti; Márcia V. Bisol; Kelly S. Bezerra; Nelson R. Antoniosi Filho; Fátima M. Bento

Sediment from the bottom of biodiesel storage tanks was characterized by chemical and microbiological techniques. Fatty acids esters and metal ions were detected, as well as bacteria and fungi, which after 60 days in incubation did not exhibit biodiesel deteriogenic potential.


Published online: April 11, 2018.

J. Braz. Chem. Soc. 2018

Synergism in the Antibacterial Action of Ternary Mixtures Involving Silver Nanoparticles, Chitosan and Antibiotics

Marcelo S. L. Brasil; Aline L. Filgueiras; Marina B. Campos; Mariana S. L. Neves; Mateus Eugênio; Lídia A. Sena; Celso B. Sant'Anna; Vânia L. da Silva; Cláudio G. Diniz; Antonio C. Sant'Ana

The combined antimicrobial action of the ternary mixture of silver nanoparticles, chitosan and antibiotics against four bacterial strains proved synergic. The pH conditions for the biological assays were carefully defined to exclude the acid effect in the antimicrobial action, preserving chitosan solubility.


Published online: April 11, 2018.

J. Braz. Chem. Soc. 2018

Optimization and Validation of an Extraction Method for Evaluating the Availability of Cu, Zn, Mn, Ni, Cr and Cd in Soil with the Use of the Mehlich-1 Extractor

Gesiara F. Silva; Marília B. Galuch; Alessandro F. Martins; Danielle G. O. Prado; Jesuí V. Visentainer; Elton G. Bonafé

Determination of the total amount of heavy metals present in soils is not a good index to estimate the bioavailability and toxicity of these elements. This work describes the use of the Mehlich-1 extractor for evaluating the availability of Cu, Zn, Mn, Ni, Cr and Cd in soil.


Published online: April 10, 2018.

J. Braz. Chem. Soc. 2018

Surface Modification of Poly(GMA-co-EDMA-co-MMA) with Resorcarenes

Alver A. Castillo-Aguirre; Betty A. Velásquez-Silva; Cindy Palacio; Frank Baez; Zuly J. Rivera-Monroy; Mauricio Maldonado

Regioselective modification of poly(2,3-epoxypropyl methacrylate-co-ethylene glycol dimethacrylate-co-methyl methacrylate) (poly(GMA-co-EDMA-co-MMA)) with resorcarenes.


Published online: April 10, 2018.

J. Braz. Chem. Soc. 2018

Sub-Minute Method for Determination of Naphazoline in the Presence of Diphenhydramine, Pheniramine or Chlorpheniramine by Capillary Electrophoresis

Michelle M. A. C. Ribeiro; Mariana C. Marra; Brenda M. C. Costa; Thiago C. Oliveira; Alex D. Batista; Rodrigo A. A. Muñoz; Eduardo M. Richter

This work presents a simple and low-cost capillary electrophoresis (CE) method for ultra-fast (< 1 min) simultaneous determination of naphazoline in the presence of diphenhydramine or pheniramine or chlorpheniramine.


Published online: April 3, 2018.

J. Braz. Chem. Soc. 2018

The Chemical Composition of Winter Fogs at São Paulo Highway Sites

Pérola C. Vasconcellos; Fábio L. T. Gonçalves; Simone G. Avila; Vitor K. Censon; Heidi Bauer

Fog sampler, an equipment used to collect fog samples at 2 roads in São Paulo City. Collected droplets coalesce and run down the strands, aided by gravity and aerodynamic drag, into a Teflon® sample trough.


Published online: April 3, 2018.

J. Braz. Chem. Soc. 2018

A Validated NMR Approach for MDMA Quantification in Ecstasy Tablets

Nathalia S. Almeida; Luiz E. C. Benedito; Adriano O. Maldaner; Aline L. de Oliveira

An internal standard 1H-qNMR (quantitative nuclear magnetic resonance) method was developed and validated for simple, accurate and fast quantification of 3,4-methylenedioxymethamphetamine (MDMA) in seized ecstasy tablets.


Published online: April 3, 2018.

J. Braz. Chem. Soc. 2018

Burkholderia thailandensis: the Main Bacteria Biodegrading Fipronil in Fertilized Soil with Assessment by a QuEChERS/GC-MS Method

Luciana T. D. Cappelini; Juliana V. Alberice; Patrícia F. M. Eugênio; Eloisa Pozzi; Ana Carolina Urbaczek; Lia G. R. Diniz; Elma N. V. M. Carrilho; Emanuel Carrilho; Eny M. Vieira

A QuEChERS/GC-MS method was essential to quantitate the biological degradation of fipronil in soil fertilized with humic substances. We isolated more than two-dozens of microorganisms from such soil, and the most abundant, Burkholderia thailandensis, showed the capability to degrade fipronil into active metabolites.


Published online: April 2, 2018.

J. Braz. Chem. Soc. 2018

Improving Antioxidant Activity of Ophioglossum thermale Kom. by Fermentation with Talaromyces purpurogenus M18-11

Jian-wei Dong; Le Cai; Xue-jiao Li; Rui-feng Mei; Ping Luo; Zhong‑tao Ding

Ophioglossum thermale Kom. was fermented with Talaromyces purpurogenus M18-11. T. purpurogenus is an effective strain to process O. thermale for improving the antioxidant activity.


Published online: April 2, 2018.

J. Braz. Chem. Soc. 2018

Degradation of Aqueous Paraquat by Surface Air Plasma: A Kinetic Study

Camilo Fabris; Gabriele B. Baroncello; Péricles I. Khalaf

The graphical abstract schematically shows the surface air plasma setup for aqueous paraquat degradation. The production of reactive nitrogen species (RNS) and the ionic strength effect on paraquat degradations are shown in detail on the graphs.


Published online: March 28, 2018.

J. Braz. Chem. Soc. 2018

Direct Synthesis of Porous Carbon Materials Prepared from Diethyldithiocarbamate Metal Complexes and Their Electrochemical Behavior

Herculano V. da Silva; Arilza O. Porto; Cristiano C. Caliman; Rubens L. de Freitas Filho; Alexandre A. C. Cotta; Waldemar A. A. Macedo; Ana Paula C. Teixeira

Porous carbon materials were prepared from Fe, Co and Ni diethyldithiocarbamate complexes. The effect of metallic center in the morphology of porous carbon structure and the electrochemical behavior of porous carbon materials were studied.


Published online: March 28, 2018.

J. Braz. Chem. Soc. 2018

Synthesis and Optimization of Colloidal Hydroxyapatite Nanoparticles by Hydrothermal Processes

Thaís M. Arantes; Lílian M. M. Coimbra; Fernando H. Cristovan; Tatiane M. Arantes; Gabriel M. Rosa; Luciano M. Lião

The smaller nanoparticles aggregate to form the nanorods by growth via the targeted binding mechanism.


Published online: March 27, 2018.

J. Braz. Chem. Soc. 2018

Application of Factorial Design and Desirability Function to Develop a Single Analytical Procedure for the Determination of Metals in Different Tissues of Blue Crab (Callinectes danae)

Daniel C. Lima; Wesley N. Guedes; Vinicius C. Costa; Fábio A. C. Amorim

Graphical abstract shows the three studied tissues, the sequence of scientific work with relation to the investigation on single condition to prepare samples, analytical features, validation of analytical procedure and application.


Published online: March 27, 2018.

J. Braz. Chem. Soc. 2018

Immobilization of Burkholderia cepacia on Pristine or Functionalized Multi‑Walled Carbon Nanotubes and Application on Enzymatic Resolution of (RS)‑1‑Phenylethanol

Michele R. G. Dias; Alysson de Pauloveloso; Lilian F. M. do Amaral; Rhaísa T. Betim; Maria G. Nascimento; Cristiane Pilissão

The systems Burkholderia cepacia lipase (BCL) on pristine or functionalized multi-walled carbon nanotubes (MWCNTs) resulted in a 3-fold improvement in the conversion and in a 5-fold improvement in ees (enantiomeric excess of the substrate), when compared with free BCL. The support was reused for eight cycles. An increase in the thermal stability of BCL was confirmed by thermogravimetric analysis (TGA).


Published online: March 23, 2018.

J. Braz. Chem. Soc. 2018

Volatile Profile of Sparkling Wines Produced with the Addition of Mannoproteins or Lees before Second Fermentation Performed with Free and Immobilized Yeasts

Gustavo P. Costa; Karine P. Nicolli; Juliane E. Welke; Vitor Manfroi; Claudia A. Zini

The use of immobilized yeasts and aging on mannoproteins or lees seemed to be a promising treatment to achieve positive aroma notes in the volatile profile of sparkling wines.


Published online: March 23, 2018.

J. Braz. Chem. Soc. 2018

Seasonal and Spatial Distribution of Caffeine, Atrazine, Atenolol and DEET in Surface and Drinking Waters from the Brazilian Federal District

Fernando F. Sodré; Joyce S. Santana; Thiago R. Sampaio; Cristina C. S. Brandão

This work shows the distribution of selected micropollutants in Paranoá Lake that receives effluents from the capital of Brazil and will be used to produce drinking water in order to avoid water scarcity. Source and drinking waters were also investigated.


Published online: March 22, 2018.

J. Braz. Chem. Soc. 2018

Supramolecular Characterization of Humic Acids Obtained through the Bacterial Transformation of a Low Rank Coal

Nelson O. Valero; Liliana C. Gómez; Luz M. Melgarejo

The characterization of humic acid (HA) obtained by activity of bacterial strains, that transform a low rank coal (LRC) lignite type and release humified organic matter (HOM), was compared with HA obtained by the traditional alkaline extraction method using 0.5 M NaOH (HA-NaOH).


Published online: March 22, 2018.

J. Braz. Chem. Soc. 2018

Optimization of Experimental Parameters in Analysis of Pharmaceutical Pellets by Near Infrared-Chemical Imaging (NIR-CI) and Multivariate Curve Resolution with Alternating Least Squares (MCR-ALS)

José Augusto Da-Col; Ronei J. Poppi

In this study, the evaluation of multivariate curve resolution with alternating least squares (MCR-ALS) parameters was important for the analysis results of pharmaceutical pellets composition.


Published online: March 22, 2018.

J. Braz. Chem. Soc. 2018

Solid State Reaction of Serpentinite Mg3Si2O5(OH)4 with NaOH to Produce a New Basic Catalytic Phase Na2Mg2Si2O7 for Biodiesel Production

Gilvan M. Paz; Sara S. Vieira; Alexandre C. Bertoli; Fabiane C. Ballotin; Edmilson M. de Moura; Ana Paula C. Teixeira; Demétrio A. S. Costa; Ottávio Carmignano; Rochel M. Lago

The nature of the catalytic site is not clear, but one can consider that in the Na2Mg2Si2O7 structure is forming a species Si−O-Na+. One possible mechanism is the interaction of CH3OH with the basic site Si−O-Na+.


Published online: March 21, 2018.

J. Braz. Chem. Soc. 2018

Palladium Nanoparticles within Core-Cross-Linked Polymer Gels for Suzuki Coupling Reactions: from Monomers to Ready-to-Use Catalysts in Two-Steps

Tanize Bortolotto; Gabrielly E. Neumann; Suelen G. Trindade; Laura C. E. da Silva; Oscar E. D. Rodrigues; Vanessa Schmidt; Cristiano Giacomelli

Well-defined cross-linked polymeric structures behaving as highly hydrated unimolecular objects (polymer nanogels) are suitable capping agents for palladium nanoparticle catalyst systems. This structurally complex catalyst composite can be prepared in two-steps.


Published online: March 20, 2018.

J. Braz. Chem. Soc. 2018

Microstructure by Thermal Attack under Vacuum of a Superduplex Stainless Steels and Electrochemical Behavior in H2S/CO2-Saturated Synthetic Seawater

Elki C. Souza; Carlos A. Fortulan; João M. D. A. Rollo

Superduplex stainless steels composed in both equal fraction ferritic-austenite phases are applied as components for use in petrochemical industries in off-shore platforms and its corrosion resistance (due to the passive film on the surface) is dependent on the temperature and environment in which they are exposed.


Published online: March 20, 2018.

J. Braz. Chem. Soc. 2018

Determination of Colchicine in Pharmaceutical Formulations and Urine by Multiple-Pulse Amperometric Detection in an FIA System Using Boron-Doped Diamond Electrode

Débora A. R. Moreira; Fernando M. de Oliveira; Dilton M. Pimentel; Tiago J. Guedes; Rita C. S. Luz; Flávio S. Damos; Arnaldo C. Pereira; Rodrigo A. B. da Silva; Wallans T. P. dos Santos

Selective, simple and fast determination of colchicine by multiple pulse amperometry coupled to flow injection analysis (FIA-MPA) system in pharmaceutical formulations and urine samples using a boron-doped diamond electrode.


Published online: March 20, 2018.

J. Braz. Chem. Soc. 2018

In vitro Analysis of the Interaction between Human Serum Albumin and Semi‑Synthetic Clerodanes

Otávio A. Chaves; Áurea Echevarria; Andressa Esteves-Souza; Maria A. M. Maciel; José C. Netto-Ferreira

The interaction between human serum albumin (HSA) and semi-synthetic clerodanes showing potential anti-cancer activity was evaluated by experimental and theoretical methods. The clerodanes derived from trans-dehydrocrotonin (t-DCTN), methyl-hydrazone (MHDCTN) and phenyl-hydrazone (PHDCTN), showed better binding ability than the natural product t-DCTN.


Published online: March 19, 2018.

J. Braz. Chem. Soc. 2018

Fatty Acid Profile and Milk Cholesterol of Crossbred Holstein × Zebu Cows Fed on Whole Cottonseed

Edvaldo N. Costa; Sibelli P. B. Ferrão; Robério R. Silva; Antonio F. Porto Jr.; Jeanny M. A. Damásio; Bismark M. Santiago; Evely G. L. Costa; Fabiano F. da Silva

In the milk of Holstein × Zebu crossbred cows fed on whole cottonseed, there is a modification of the lipid profile that reduces the concentration of saturated fatty acids (SFA), monounsaturated FA (MFA) and making it rich in polyunsaturated FA (PUFA), which is beneficial to health.


Published online: March 19, 2018.

J. Braz. Chem. Soc. 2018

Electrode Material Containing Graphite Incorporated to an Amino-Functionalized Polydimethylsiloxane Network for the Detection of Copper

Ricardo P. D. Silva; Alzira M. S. Lucho; Fabio L. Pissetti

A polydimethylsiloxane amino functionalized polymer network with graphite incorporated was used as electrode material to detect copper ions in aqueous solutions and sugarcane spirit.


Published online: March 16, 2018.

J. Braz. Chem. Soc. 2018

Silver Complex of an N-Heterocyclic Carbene Ligand with Bulky Thiocarbamate Groups

Elvis Robles-Marín; Alexander Mondragón; Marcos Flores‑Alamo; Ivan Castillo

A thiocarbamate-containing imidazolium reacts with Ag2O affording the sterically hindered N-heterocyclic carbene (NHC)-silver complex.


Published online: March 15, 2018.

J. Braz. Chem. Soc. 2018

Fatty Acid Composition and Carotenoids in Raw and Grilled Tilapia GIFT Fillets Supplemented with Lycopene, β-Carotene and Lutein

Elaine C. Reis; Marília B. Galuch; Roberta da Silveira; Hevelyse M. C. dos Santos; Cesar Sary; Thiago F. S. Magon; Ingrid L. Figueiredo; Ricardo P. Ribeiro; Jesuí V. Visentainer; Oscar O. Santos

Lycopene, lutein and beta-carotene capsules were supplemented to tilapia (genetically improved farmed tilapia, GIFT). An increase in the concentration of all compounds supplemented, as well as the preservation in the lipid quality was observed in the fillets, even after thermal processing.


Published online: March 13, 2018.

J. Braz. Chem. Soc. 2018

Evaluating the Electrochemical Characteristics of Babassu Coconut Mesocarp Ethanol Produced to Be Used in Fuel Cells

Ziel S. Cardoso; Isaide A. Rodrigues; Cáritas J. S. Mendonça; José R. P. Rodrigues; Walace R. A. Ribeiro; Wanderson O. Silva; Adeilton P. Maciel

Stages of the process of evaluation of the electrochemical characteristics of babassu alcohol.


Published online: March 13, 2018.

J. Braz. Chem. Soc. 2018

Full Factorial Experimental Design for Carbamazepine Removal Using Electrochemical Process: a Case Study of Scheming the Pathway Degradation

Fouad F. Al-Qaim; Zainab H. Mussa; Ali Yuzir; Md P. Abdullah; Mohamed R. Othman

Full factorial experimental design was applied for the treatment of carbamazepine, which is one of the most used drugs for treatment of neuropathic pain. The results showed that applied voltage is the most significant factor in this treatment process. Moreover, pathway degradation was monitored as well using liquid chromatography-time of flight/mass spectrometry (LC-TOF/MS).


Published online: March 13, 2018.

J. Braz. Chem. Soc. 2018

Synthesis of Modified Silica Aerogel Nanoparticles for Remediation of Vietnamese Crude Oil Spilled on Water

Hong K. D. Nguyen; Phuong T. Hoang; Ngo T. Dinh

Surface modified silica aerogel nanoparticles.


Published online: March 13, 2018.

J. Braz. Chem. Soc. 2018

Griseofulvin, Diketopiperazines and Cytochalasins from Endophytic Fungi Colletotrichum crassipes and Xylaria sp., and Their Antifungal, Antioxidant and Anticholinesterase Activities

Vanessa M. Chapla; Maria L. Zeraik; Mariana C. Cafeu; Geraldo H. Silva; Alberto J. Cavalheiro; Vanderlan S. Bolzani; Maria C. M. Young; Ludwig H. Pfenning; Angela R. Araujo

A new compound 1-phenylethyl-O-α-L-rhamnopyranoside from C. crassipes, together with sixteen secondary metabolites were isolated from two endophytic fungi associated with Casearia sylvestris. The compound cyclo(D)-Pro-(D)-Phe exhibited potent antifungal and antioxidant activity and potent acetylcholinesterase (AChE) inhibition.


Published online: March 9, 2018.

J. Braz. Chem. Soc. 2018

Fast Spectrophotometric Determination of Iodine Value in Biodiesel and Vegetable Oils

Samara Soares; Fábio R. P. Rocha

Schematic representation of the procedure for determination of iodine value in biodiesel and vegetable oils.


Published online: March 9, 2018.

J. Braz. Chem. Soc. 2018

Study of the Corrosive Behavior of the AISI 1020 Steel in Acid Crude Oil by Microscopic Techniques (LM, AFM and SEM/EDX) and Raman Spectroscopy

Heloisa P. Dias; Eliane V. Barros; Cristina M. S. Sad; Enrique R. Yapuchura; Alexandre O. Gomes; Robson Moura; Fernanda E. Pinto; Débora V. Domingos; Glória M. F. V. Aquije; Valdemar Lacerda Jr.; Wanderson Romão

AISI 1020 steel was submitted to thermal degradation in acid crude oil. Microscopy images (light microscopy (LM), scanning electron microscopy/energy dispersive spectroscopy (SEM/EDX), atomic force microscopy (AFM), and Raman) were combined to understand the influence of corrosion rate. A passivation film was formed, which consisted of two layers (an external, formed of FeS, and an internal, composed of iron oxides).


Published online: March 8, 2018.

J. Braz. Chem. Soc. 2018

De-NOx Performance and Mechanism of Mn-Based Low-Temperature SCR Catalysts Supported on Foamed Metal Nickel

Baozhong Zhu; Guobo Li; Yunlan Sun; Shoulai Yin; Qilong Fang; Zhaohui Zi; Zicheng Zhu; Jiaxin Li; Keke Mao

The Eley-Rideal mechanism and superior H2O resistance of Mn7.5/foamed metal nickel (FMN) catalyst in NH3-selective catalytic reduction (SCR) reaction.


Published online: March 8, 2018.

J. Braz. Chem. Soc. 2018

Thermal Properties of the Blends of Methyl and Ethyl Esters Prepared from Babassu and Soybean Oils

Cleber L. Nicolau; Aline N. V. Klein; Cinthia A. A. Silva; Antonio R. Fiorucci; Jusinei M. Stropa; Elisandra O. Santos; Kênia C. S. Borges; Rogério C. L. da Silva; Lincoln C. S. de Oliveira; Edésio L. Simionatto; Dilamara R. Scharf; Euclésio Simionatto

Ester blends from the transesterification of babassu oil and soybean oil were evaluated for their thermal properties. The babassu esters have been shown a positive influence on the crystallization point profile of the blends.


Published online: March 7, 2018.

J. Braz. Chem. Soc. 2018

Ketalization of Ketones to 1,3-Dioxolanes and Concurring Self-Aldolization Catalyzed by an Amorphous, Hydrophilic SiO2-SO3H Catalyst under Microwave Irradiation

Sandro L. Barbosa; Myrlene Ottone; Mainara T. de Almeida; Guilherme L. C. Lage; Melina A. R. Almeida; David Lee Nelson; Wallans T. P. dos Santos; Giuliano C. Clososki; Norberto P. Lopes; Stanlei I. Klein; Lucas D. Zanatta

A sulfuric acid modified silica catalyst has great affinity for ketones, producing high yields of self-condensation products; in the presence of polyalcohols, ketals are easily prepared.


Published online: March 7, 2018.

J. Braz. Chem. Soc. 2018

Applicability of a Voltammetric Assay Based on the Electroreduction of Oxygen to Evaluate the Antioxidant Capacity of Pequi (Caryocar brasiliense Camb.) Pulp

Flávia A. Pinheiro; Leonardo L. Okumura; Astréa F. S. Silva; Júnio G. Silva; Letícia R. Ferreira; Edilton S. Barcellos; Edimar A. F. Fontes

Application of a novel voltammetric assay to evaluation of the total antioxidant capacity of pequi pulp, as alternative to spectrophotometric assays.


Published online: March 6, 2018.

J. Braz. Chem. Soc. 2018

Analytical Method Development for Fatty Acid Direct Methylation in Fruits

Patrícia D. S. Santos; Roberta da Silveira; Natália V. Reis; Jesuí V. Visentainer; Oscar O. Santos

Through the surface response methodology, it was developed a direct methylation method of fatty acids in fruit samples.


Published online: March 5, 2018.

J. Braz. Chem. Soc. 2018

(+)-BINOL and Pure Shift Experiment: A Bidirectional Approach for NMR Chiral Discrimination of Overcrowded Spectra of Primary Amines

Juliana C. Merino; Artur F. Keppler; Márcio S. Silva

The 1H pure shift nuclear magnetic resonance (NMR) experiment and the readily available (+)-1,1'-bi-2-naphtol (BINOL) chiral auxiliary can be used for routine chiral discrimination analysis of complex NMR spectra.


Published online: March 1, 2018.

J. Braz. Chem. Soc. 2018

Removal of Beta-Lactams Antibiotics through Zero-Valent Copper Nanoparticles

Lucas M. F. Oliveira; Mayra A. Nascimento; Yuri M. Guimarães; André F. Oliveira; Antônio A. Silva; Renata P. Lopes

The removal process of antibiotics can occur through degradation by Cu+ species and also adsorption by Cu2+ hydroxides/oxides which can be formed on the surface of nanoparticles.


Published online: February 27, 2018.

J. Braz. Chem. Soc. 2018

Phragmalin Limonoids from Swietenia macrophylla and Their Antifeedant Assay against Mahogany Predator

Sônia G. S. R. Pamplona; Mara S. P. Arruda; Kelly C. F. Castro; Consuelo Y. Y. e Silva; Antonio G. Ferreira; Maria F. G. F. da Silva; Orlando S. Ohashi; Milton N. da Silva

Eight new phragmalin limonoids with an 8,9,30-ortho-ester unit, together with eight known were isolated from Swietenia macrophylla King. Four known limonoids show a significant reduction in the larval weight of Hypsipyla grandella.


Published online: February 26, 2018.

J. Braz. Chem. Soc. 2018

Investigation of Distribution of Antioxidant Compounds from Natural Sources and Study of Lipid Protection in Oil-in-Water Emulsions

Sylvio V. Palombini; Fabiana Carbonera; Marília B. Galuch; Thiago Claus; Thiago F. S. Magon; Jesuí V. Visentainer; Sandra T. M. Gomes; Makoto Matsushita

Direct addition of natural sources of antioxidants in oil-in-water emulsions, followed by the study of their antioxidant activity and the distribution of the antioxidant compounds between the emulsion phases.


Published online: February 26, 2018.

J. Braz. Chem. Soc. 2018

Improved Method for Microwave-Assisted Synthesis of Benzodiazepine-2,5-diones from Isatoic Anhydrides Mediated by Glacial Acetic Acid

Armando De La Cruz; Carlos Alejandro Vega-Acevedo; Ignacio A. Rivero; Daniel Chávez

Improved method for the synthesis of benzodiazepin-2,5-diones and 7-iodobenzodiazepin-2,5-diones mediated by glacial acetic acid.


Published online: February 26, 2018.

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