22:23, Tue Jul 17

Open Access/APCs

Forthcoming Papers - 2018

Articles published online ahead of print

Articles J. Braz. Chem. Soc. 2018

Radon Levels in a Hospital in Niterói Municipality-RJ, Brazil

Camila R. Silva; Pedro P. Caldeira; Angela S. F. Nani; Emmanoel V. Silva-Filho

The radium present in the soil decays originating 222Rn, a gas with high mobility that diffuses to the surface through pores, fissures in the soil and by the groundwater.


Published online: July 17, 2018.

J. Braz. Chem. Soc. 2018

Anti-Parasite and Cytotoxic Activities of Chloro and Bromo L-Tyrosine Derivatives

Manuel Pastrana Restrepo; Elkin Galeano Jaramillo; Alejandro Martínez Martínez; Ana Mesa Arango; Sara Robledo Restrepo

Bromo and chloro L-tyrosine derivatives actives against L. panamensis.


Published online: July 16, 2018.

J. Braz. Chem. Soc. 2018

Virtual Screening for the Selection of New Candidates to Trypanosoma cruzi Farnesyl Pyrophosphate Synthase Inhibitors

Larissa M. Oliveira; Janay S. C. Araújo; David B. Costa Júnior; Manoelito C. dos Santos Junior; Aníbal F. Santos Júnior; Franco H. A. Leite

Virtual screening to select Trypanosoma cruzi farnesyl pyrophosphate synthase inhibitors.


Published online: July 12, 2018.

Short Report J. Braz. Chem. Soc. 2018

Potential Antileishmanial Activity of 4-N-Acylhydrazone Pyrazolo[3,4-d]pyridazin-7-ones: Synthesis, in vitro Biological Evaluations and Computational Studies

Andrey P. Jacomini; Michael J. V. da Silva; Julia Poletto; Gessica M. Ribeiro; Jessica T. C. Yokoyama; Danielle L. Bidóia; Fávero R. Paula; Celso V. Nakamura; Maria Helena Sarragiotto; Fernanda A. Rosa

Synthesis of new series of pyrazolo[3,4-d]pyridazin-7-ones with antileishmanial activity and low toxicity against Leishmania amazonensis (strain WHOM/BR/75/JOSEFA), promastigote and amastigote forms.


Published online: July 12, 2018.

Articles J. Braz. Chem. Soc. 2018

β-Enaminoesters as Novel Corrosion Inhibitors for Carbon Steel in Acidic Medium

Mariana F. L. P. Carlos; Arthur Valbon; Marcelo A. Neves; Margareth R. L. Santos; Aurea Echevarria

American Iron and Steel Institute (AISI) 1020 carbon steel in 0.5 mol L-1 HCl in absence (blank) and presence of 1 × 10-2 mol L-1 ethyl-(2Z)-3-[(2-phenylethyl)amino]but-2-enoate (EN1).


Published online: July 11, 2018.

J. Braz. Chem. Soc. 2018

Pulp Mill Effluent Treatment Using Plasma Obtained by High Voltage Electrolysis

Alexsandro A. Matias; César Reis; Efraim L. Reis; Cláudio M. Silva; Odilaine I. C. Damasceno; Antônio A. Neves

The plasma is produced between two electrodes immersed in the pulp mill effluent, at 585 V and 200 mA, producing various types of reactive agents, that were used to breakdown diverse organic compounds.


Published online: July 10, 2018.

J. Braz. Chem. Soc. 2018

Metabolite Fingerprinting and Profiling of the Medicinal Grass Eleusine indica Based on HPLC-DAD, UPLC-DAD-MS/MS and NMR Analyses

Evelyn M. C. Peñaloza; Livia M. Casanova; Ivana C. R. Leal; Paula F. de Aguiar; Sônia S. Costa

Crude aqueous extracts of aerial and underground parts of Eleusine indica populations from four different localities were analyzed by high-performance liquid chromatography with diode array detection (HPLC-DAD), ultra-performance liquid chromatography with diode array detector and mass spectrometry (UPLC-DAD-MS/MS) and nuclear magnetic resonance (NMR) spectroscopy.


Published online: July 6, 2018.

J. Braz. Chem. Soc. 2018

Fast Ephedrine Quantification by Gas Chromatography Mass Spectrometry

Gabriel R. A. Carneiro; Andressa M. S. Silva; Raquel M. Cavalcante; Monica C. Padilha; Francisco R. de Aquino Neto; Henrique M. G. Pereira; Vinícius F. Sardela

Straightforward method for ephedrine quantification based on gas chromatography mass spectrometry (GC-MS), without cleanup, and optimized by multivariate Doehlert matrix.


Published online: July 3, 2018.

J. Braz. Chem. Soc. 2018

Facile Synthesis and Characterization of Symmetric N-[(Phenylcarbonyl) carbamothioyl]benzamide Thiourea: Experimental and Theoretical Investigations

Rafael G. Silveira; Anderson J. L. Catão; Beatriz N. Cunha; Fernando Almeida; Rodrigo S. Correa; Luan F. Diniz; Juan C. Tenório; Javier Ellena; Aleksey E. Kuznetso; Alzir A. Batista; Edésio Alcântara

Simple synthesis path for obtaining a symmetric thiourea, the theoretical characterization and verification of the intermolecular interactions obtained by X-ray crystallography.


Published online: July 2, 2018.

J. Braz. Chem. Soc. 2018

Synthesis and Optical Properties of Water-Soluble CdTe:Zn2+ Quantum Dots Prepared by the One-Pot Approach

José C. L. Sousa; Marcelo G. Vivas; Jefferson L. Ferrari; Marco A. Schiavon

Color map representing the emission vs. excitation wavelengths for different synthesis times of CdTe:Zn2+ quantum dots (QDs), and the normalized characteristic emission spectra obtained from the evolving factor analysis/multivariate curve resolution alternating least squares (EFA/MCR-ALS) method for each QD solution show the different sizes of the nanoparticles.


Published online: July 2, 2018.

J. Braz. Chem. Soc. 2018

A Convenient Synthesis, Reactions and Biological Activity of Some New 6H-Pyrazolo[4',3':4,5]thieno[3,2-d][1,2,3]triazine Compounds as Antibacterial, Anti-Fungal and Anti-Inflammatory Agents

Remon M. Zaki; Adel M. Kamal El-Dean; Shaban M. Radwan; Ahmed F. Saber

In the present work, we have provided an easy access for synthesis of novel thienopyrazole compounds, which were used as starting materials for building new heterocyclic systems namely: pyrazole, triazole and triazine, attached or fused to the thienopyrazole moiety that have revealed remarkable antimicrobial and anti-inflammatory activities.


Published online: June 29, 2018.

Communication J. Braz. Chem. Soc. 2018

An Efficient Method for the Hydrolysis of Potassium Organotrifluoroborates Promoted by Montmorillonite K10

Renato L. Silva; Cosme S. Santos; Jonh A. M. Santos; Roberta A. Oliveira; Paulo H. Menezes; Juliano C. R. Freitas

An efficient and non-expensive method for conversion of diverse potassium organotrifluoroborates to their corresponding boronic acids and boronic esters promoted by montmorillonite K10 using water as the reaction solvent is described.


Published online: June 26, 2018.

Articles J. Braz. Chem. Soc. 2018

Optimization of Acid Hydrolysis of Myricetin-3-O-rhamnoside Using Response Surface Methodology

Tatiana C. Tolosa; Hervé Rogez; Evaldo M. Silva; Jesus N. S. Souza

The acid hydrolysis of glycosylated flavonols were optimized and the hydrolytic process used is effective and applicable to plant extract (Inga edulis leaves).


Published online: June 26, 2018.

J. Braz. Chem. Soc. 2018

Voltammetric Determination of Zn2+ in Antiseptic Dusting Powder and Multivitamins Using a Carbon Paste Electrode Modified with Bi Anchored on Amberlite® IR120

Wilson T. Fonseca; Leandro A. R. Ribeiro; Lauro A. Pradela-Filho; Regina M. Takeuchi; André L. Santos

Carbon paste electrodes modified with Bi anchored on Amberlite® IR120 enable fast Zn2+ determination in multivitamin and antiseptic dusting powder samples.


Published online: June 26, 2018.

J. Braz. Chem. Soc. 2018

Assessment of Adulteration of Cosmetics Based on Vegetable Oils by GC-FID and Lipid Profile Using Direct Infusion Electrospray Ionization Mass Spectrometry (ESI-MS)

Jessica S. Pizzo; Marília B. Galuch; Patrícia D. S. Santos; Oscar O. Santos; Lorena Visentainer; Marcos N. Eberlind; Jesuí V. Visentainer

Vegetable oils have been applied to human skin for cosmetic purposes for a long time. However, they are targets of adulterations, especially with addition of oils with low cost. This study will evaluate the authenticity of Brazilian cosmetics based on vegetable oils.


Published online: June 25, 2018.

J. Braz. Chem. Soc. 2018

Electrochemical Deposition of the Single Phase TlxCu3 – xSe2 Thin Films

Francisco W. S. Lucas; Lucia H. Mascaro

TlCu2Se2 texturized film was electrodeposited with [004] crystalline plane oriented parallel to the substrate surface. This texturization can also be associated with the films morphology.


Published online: June 25, 2018.

J. Braz. Chem. Soc. 2018

Simultaneous Determination of Four Antibiotics in Raw Milk by UPLC-MS/MS Using Protein Precipitation as Sample Preparation: Development, Validation, and Application in Real Samples

Thiago Magon; Roberta da Silveira; Marília B. Galuch; Eder Paulo Fagan; Ana Flavia D. Feitoza; Sylvio V. Palombini; Oscar O. Santos; Jesui V. Visentainer

Determination of tetracycline, oxytetracycline, penicillin G and ceftiofur in raw milk by ultra-performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS) using protein precipitation as sample preparation: development, validation, and application in raw milk samples from dairy cows medicated with tetracycline (24, 48, 72 and 96 h after treatment) for subclinical mastitis.


Published online: June 25, 2018.

J. Braz. Chem. Soc. 2018

Chemometric-Assisted Hydrophilic Interaction Chromatographic Method for the Determination of Gadolinium-Based Magnetic Resonance Imaging Contrast Agent in Liposomes

Ana Luiza C. Maia; Pedro Henrique R. da Silva; Christian Fernandes; Aline T. M. e Silva; André Luís B. de Barros; Daniel Crístian F. Soares; Gilson A. Ramaldes

Development, using chemometrics tools, of a hydrophilic interaction chromatographic method for the determination of gadodiamide in liposomes.


Published online: June 22, 2018.

J. Braz. Chem. Soc. 2018

Use of a Natural Sorbent as Alternative Solid-Phase Microextraction Coating for the Determination of Polycyclic Aromatic Hydrocarbons in Water Samples by Gas Chromatography-Mass Spectrometry

Natália G. Suterio; Sângela N. do Carmo; Dilma Budziak; Josias Merib; Eduardo Carasek

In this study, the use of a biosorbent-based coating in solid-phase microextraction was proposed for the determination of polycyclic aromatic hydrocarbons in water samples.


Published online: June 22, 2018.

J. Braz. Chem. Soc. 2018

Synthesis and Antibacterial Evaluation of 3,5-Diaryl-1,2,4‑oxadiazole Derivatives

Felipe S. Cunha; Joseli M. R. Nogueira; Alcino P. de Aguiar

Twenty 1,2,4-oxadiazole derivatives were synthesized and evaluated against five different bacteria.


Published online: June 20, 2018.

J. Braz. Chem. Soc. 2018

Preparation of Microcapsules of Slow-Release NPK Compound Fertilizer and the Release Characteristics

Wancheng Pang; Dejia Hou; Huan Wang; Shu Sai; Baorui Wang; Jingwen Ke; Gaobing Wu; Qing Li; Mark T. Holtzapple

The graphical abstract is an amplified structure of slow-release fertilizer. Microcapsule structure has disappeared after water soaking and the nutrient is slowly released completely.


Published online: June 19, 2018.

J. Braz. Chem. Soc. 2018

Oxidation of Single-Walled Carbon Nanotubes under Controlled Chemical Conditions

Arthur B. Porto; Glaura G. Silva; Hélio F. dos Santos; Luiz F. C. de Oliveira

Single-walled carbon nanotubes (SWCNT) are oxidized in acid medium under controlled NO2+ concentration and reaction time.


Published online: June 18, 2018.

J. Braz. Chem. Soc. 2018

Al-MCM-41 Synthesized from Kaolin via Hydrothermal Route: Structural Characterization and Use as an Efficient Adsorbent of Methylene Blue

Evânia C. Santos; Luelc S. Costa; Edipo S. Oliveira; Raquel A. Bessa; Armando D. L. Freitas; Cristiane P. Oliveira; Ronaldo F. Nascimento; Adonay R. Loiola

Natural kaolin is efficiently converted, via dealumination and hydrothermal route, to Al-Mobil Composition of Matter No. 41 (Al-MCM-41) mesoporous materials, with a high area surface, showing high performance on methylene blue adsorption from aqueous medium.


Published online: June 18, 2018.

J. Braz. Chem. Soc. 2018

Compound-Specific δ13C of n-Alkanes: Clean-Up Methods Appraisal and Application to Recent Sediments of a Highly Contaminated Bay

Milena Ceccopieri; Arthur L. Scofield; Lilian Almeida; Angela L. R. Wagener

The image summarizes the δ13C equation and the isotopic signature from different carbon sources in the Guanabara Bay, i.e., phytoplankton, mangrove trees, fossil fuel from boat traffic and industries.


Published online: June 14, 2018.

J. Braz. Chem. Soc. 2018

Geometry and Stability of Molecular Clusters: Factor to Be Considered in Biomolecular Activity

Noam G. da Silva; Alexandre M. Alecrim; Renyer A. Costa; Kelson M. T. de Oliveira

Molecular clusters are proposed as explanation for the different activities of betulinic and melaleucic acids, compounds with very similar properties.


Published online: June 12, 2018.

J. Braz. Chem. Soc. 2018

N-Alkylated Sulfamic Acid Derivatives as Organocatalyst in Multicomponent Synthesis of Fatty Dihydropyrimidinones

Carolina R. L. Hack; Larissa Porciuncula; Andressa C. H. Weber; Caroline R. M. D'Oca; Dennis Russowsky; Jaqueline M. Moura; Luiz A. A. Pinto; Marcelo G. M. D'Oca

N-Alkylated sulfamic acid derivatives are introduced as promising acidic organocatalysts in multicomponent reactions to the synthesis of dihydropyrimidinones.


Published online: June 11, 2018.

J. Braz. Chem. Soc. 2018

In-Line Incomplete Solid-Liquid Extraction for Spectrophotometric Determination of Soluble Inorganic Phosphorus in Plants and Foods

Caio C. V. Macedo; Rodrigo S. N. Mancini; Carolina Y. Arakaki; Diogo L. Rocha

Incomplete and reproducible soluble inorganic phosphorus extraction from vegetable materials and foods prior to spectrochemical analysis in a flow injection analysis (FIA) system with zones penetration.


Published online: June 8, 2018.

J. Braz. Chem. Soc. 2018

Automatic Procedure to Determine Acidity in Fuel Ethanol by Photometric Titration Using Binary Search and Multicommuted Flow Analysis

Manoel J. A. Lima; Boaventura F. Reis

A pictorial overview of the titration procedures for ethanol fuel employing manual and automatic approaches.


Published online: June 8, 2018.

J. Braz. Chem. Soc. 2018

Synthesis, Characterization and Evaluation of in vitro Antitumor Activities of Novel Chalcone-Quinolinone Hybrid Compounds

Giulio D. C. d'Oliveira; Andrea F. Moura; Manoel O. de Moraes; Caridad N. Perez; Luciano M. Lião

Chalcone-quinolinone synthesis: one step reaction, good yield and pure precipitate.


Published online: June 4, 2018.

J. Braz. Chem. Soc. 2018

Occurrence of Pesticides in Pericarpium Citri Reticulatae and Related Products Using Syringe Filter-Based Cleanup

Fuxin Liu; Xiaowen Dou; Jiaoyang Luo; Dandan Kong; Zhuowen Fan; Meihua Yang

Persistent organochlorines were found in commercial Pericarpium Citri Reticulatae by a "push-and-pull" needle filter based cleanup and gas chromatography (GC) analysis.


Published online: June 4, 2018.

J. Braz. Chem. Soc. 2018

Wastewater-Based Epidemiology of Cocaine in the Brazilian Federal District: Spatial Distribution, Weekly Variation and Sample Preservation Strategies

Fernando F. Sodré; Rafael S. Feitosa; Wilson F. Jardim; Adriano O. Maldaner

Cocaine use in the Brazilian Federal District, assessed by wastewater-based epidemiology (WBE), revealed higher consumption in the north area, notably during weekends. A nationwide survey may be carried out with sewage samples adjusted to pH 2 and transported within three days under ambient conditions.


Published online: May 29, 2018.

J. Braz. Chem. Soc. 2018

Exponential Fed-Batch Cultures of Klebsiella pneumoniae under Anaerobiosis Using Raw Glycerol as a Substrate to Obtain Value-Added Bioproducts

Allan Morcelli; Rosane Rech; Andre Klafke; Rafael Pelegrini; Marco A. Z. Ayub

Residual glycerol can be used as substrate in the production of valuable compounds by Klebsiella pneumonia in exponentially fed-batch cultures (EFBC).


Published online: May 29, 2018.

J. Braz. Chem. Soc. 2018

Mate as Dietary Supplement for Broiler Chickens: Effect on the Metabolic Profile and Redox Chemistry of Meat

Caroline Ceribeli; Andressa de Zawadzki; Aline M. C. Racanicci; Luiz A. Colnago; Leif H. Skibsted; Daniel R. Cardoso

Mate extract in animal diet improves the redox status of meat by changing its metabolic profile towards the production of endogenous antioxidants.


Published online: May 29, 2018.

J. Braz. Chem. Soc. 2018

Development, Optimization and Validation of a GC Method by Polarity Phase Constants and Statistical Design of Experiments for the Determination of Monoterpenes in Alpinia zerumbet Essential Oil

Igor C. Cardoso; Marcos J. Nakamura; Virginia G. Correia; Henrique M. G. Pereira; Maria D. Behrens; Marcelo R. R. Tappin

In this report, we described the optimization by response surface methodology of a new analytical method by gas chromatography (GC) for analysis of Alpinia zerumbet essential oil.


Published online: May 29, 2018.

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.

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.

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.

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