7:33, Sat Feb 16

Open Access/APCs

Forthcoming Papers - 2019

Articles published online ahead of print

Articles 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.

J. Braz. Chem. Soc. 2019

Graphene Oxides Coated Paper as a Substrate to Paper Spray Ionization Mass Spectrometry for Creatinine Determination in Urine Samples

Aline R. Fernandes; Ricardo A. Bernardo; Thays C. de Carvalho; Boniek G. Vaz; Andréa R. Chaves

A fast and reliable methodology for creatinine determination in urine samples using graphene oxide paper by paper spray ionization mass spectrometry.


Published online: January 11, 2019.

J. Braz. Chem. Soc. 2019

Lipid Profile Determination by Direct Infusion ESI-MS and Fatty Acid Composition by GC-FID in Human Milk Pools by Folch and Creamatocrit Methods

Adriela A. Rydlewski ; Patrícia D. Silva; Luciana P. Manin; Christyna B. G. Tavares; Meliana G. Paula; Ingrid L. Figueiredo ; Vanessa B. M. J. C. Neia; Oscar O. Santos; Jesuí V. Visentainer

Lipids of human milk are extremely important nutrients for the baby proper development. This study assessed the fat content, lipid profile and fatty acid composition in pools of human milk, comparing the reference method with the creamatocrit method employed in human milk banks.


Published online: January 11, 2019.

J. Braz. Chem. Soc. 2019

Identification of Extra Virgin Olive Oils Modified by the Addition of Soybean Oil, Using Ion Chromatography

Patrícia T. Souza; Marina Ansolin; Eduardo A. C. Batista; Antonio J. A. Meirelles; Matthieu Tubino

The modification of four extra virgin olive oils from different origins with refined soybean oil, in the proportions of 0, 5, 10, 20 and 30% m/m, was studied using two approaches. First, the induction period (IP) was determined by Rancimat. In the second strategy, ion chromatography was used to quantify the formic and acetic acids, in their carboxylate forms (formate and acetate).


Published online: January 11, 2019.

J. Braz. Chem. Soc. 2019

Functionalized Dienes: A New Series of Potential Agents for the Treatment of Alzheimer's Disease

Aldo S. Oliveira ; Lidiane Meier; Eduardo Zapp; Daniela Brondani; Inês M. C. Brighente; Marcus M. Sá

Functionalized dienes as potential multi-targeted therapeutics for Alzheimer's disease.


Published online: January 9, 2019.

Short Report J. Braz. Chem. Soc. 2019

Determination of the Antioxidant Capacity of Red Fruits by Miniaturized Spectrophotometry Assays

Magda M. Becker ; Gilvanda S. Nunes; Danilo B. Ribeiro; Francisco E. P. S. Silva; Gaëlle Catanante; Jean‑Louis Marty

Miniaturized spectrophotometric assays were used to determine the antioxidant potential in strawberry and cherry fruits. Simultaneous analysis employing a reduced amount of samples and reagents were performed. Strawberry fruit showed a higher source of bioactive compounds.


Published online: January 8, 2019.

Articles J. Braz. Chem. Soc. 2019

Antioxidant Activity and Metabolomic Analysis of Cagaitas (Eugenia dysenterica) using Paper Spray Mass Spectrometry

Mauro R. Silva; Lucas G. Freitas; Amauri G. Souza; Raquel L. B. Araújo; Inayara C. A. Lacerda; Hebert V. Pereira; Rodinei Augusti ; Júlio O. F. Melo

Discrimination of Eugenia dysenterica using paper spray mass spectrometry.


Published online: January 8, 2019.

Review J. Braz. Chem. Soc. 2019

Use of Natural Deep Eutectic Solvents for Polymerization and Polymer Reactions

Analía V. Gómez; Atanu Biswas ; Carmen C. Tadini; Roselayne F. Furtado; Carlucio R. Alves; Huai N. Cheng

Natural deep eutectic solvents (NADES) comprise a new family of agro-based, eco-friendly reaction media that can replace traditional organic solvents in polymerization and polymer reactions. A review of the current progress in this exciting new field is given in this article.


Published online: January 8, 2019.

Articles J. Braz. Chem. Soc. 2018

Oxidative Dehydration of Glycerol over Molybdenum- and Vanadium-Based Catalysts

Franciel A. Bezerra; Heitor O. N. Altino; Ricardo R. Soares

The figure shows the increase in the selectivity to acrolein, through oxidative dehydration of glycerol, when vanadium and molybdenum are supported on alumina, maintaining low selectivity for COx.


Published online: December 20, 2018.

J. Braz. Chem. Soc. 2018

Photodegradation of Fluoxetine Applying Different Photolytic Reactors: Evaluation of the Process Efficiency and Mechanism

Ailton J. Moreira ; Aline C. Borges; Bianca B. de Sousa ; Vagner R. de Mendonça; Carolina D. Freschi; Gian P. G. Freschi

Kinetics of degradation of fluoxetine through ultraviolet (UV) and UV/microwave (MW) processes as mediators of direct photolysis and formation of hydroxyl radicals.


Published online: December 19, 2018.

J. Braz. Chem. Soc. 2018

APCI(+)FT-ICR MS Analysis of Hydrocarbons Using Isooctane as Ionizing Reagent - A Comparison with HTGC-FID, GC×GC-MS and NMR

Lilian V. Tose; Samantha R. C. Silva; Eliane V. Barros; Lindamara M. Souza; Fernanda E. Pinto; Debora K. Palomino; Jair C. C. Freitas; Christopher J. Thompson; Boniek G. Vaz; Valdemar Lacerda Jr. ; Wanderson Romão

Five paraffin standards of different average molar mass distributions (Mw) were easily ionized by atmospheric pressure chemical ionization Fourier transform ion cyclotron resonance mass spectrometer (APCI(+)FT-ICR MS) using isooctane as the reagent gas. Data obtained from APCI(+) analysis were compared to results obtained from analysis of high temperature gas chromatography with a flame ionization detector (HTGC-FID), GC×GC-MS and 1H and 13C nuclear magnetic resonance (NMR) spectroscopy.


Published online: December 18, 2018.

Short Report J. Braz. Chem. Soc. 2018

Flavonol Tri-O-glycoside and Other Chemical Constituents from Flowers of Aristolochia trulliformis

Juliana C. Holzbach; Walter A. Soares Filho; Camila L. Cunha; Isabele R. Nascimento

A new flavonol triglycoside was isolated from Aristolochia trulliformis flowers together with 15 known compounds.


Published online: December 14, 2018.

J. Braz. Chem. Soc. 2018

One-Pot Synthesis of NEMP, a VX Surrogate, and Reactivation of NEMP-Inhibited Electrophorus Eel Acetylcholinesterase by Current Antidotes

Samir F. A. Cavalcante ; Daniel A. S. Kitagawa; Rafael B. Rodrigues; Taynara C. Silva; Leandro B. Bernardo; Ana Beatriz A. Correa; Alessandro B. C. Simas

The structural similarity between venomous agent X (VX) and O-(4-nitrophenyl) O-ethyl methylphosphonate (NEMP) makes the latter a valuable tool for research on novel acetylcholinesterase reactivators.


Published online: December 14, 2018.

Articles J. Braz. Chem. Soc. 2018

Fluorescent Sensors Based on Cu-Doped Carbon Quantum Dots for the Detection of Rutin

Cheng-ya Wang; Shanzhai Shang; Xudong Zheng; Ping Lei; Jingmei Han; Linda Yuan; Zhiqiang Li; Ru Wang; Weimin Gong; Jianguo Tang; Yaling Yang

Schematic illustration of the sensitive fluorescence detection of rutin (RT) based on Cu-doped carbon quantum dots (Cu-CQDs).


Published online: December 14, 2018.

J. Braz. Chem. Soc. 2018

Application of LC-DAD Metabolic Fingerprinting in Combination with PCA for Evaluation of Seasonality and Extraction Method on the Chemical Composition of Accessions from Lippia alba (Mill.) N. E. Brown and Biological Activities

Raphael A. de Jesus; Vilma M. J. Prado; Vanderson S. Pinto; Valdenizia R. Silva; Luciano S. Santos; Paulo C. L. Nogueira; Sandro Navickiene; Edenir R. Pereira‑Filho ; Arie F. Blank; Daniel P. Bezerra ; Milena B. P. Soares; Claudia Seidl; Carmen L. Cardoso; Valéria R. S. Moraes

Fingerprinting chromatograms from Lippia alba (Mill.) N. E. Brown extracts and PC1 vs. PC2 scores graph.


Published online: December 13, 2018.

Short Report J. Braz. Chem. Soc. 2018

A Fast, Low-Cost, and Environmental Friendly Micro-Flow-Batch Analyzer for Photometric Determination of Sulfites in Beverages

Márcio R. S. Tavares; Stéfani I. E. Andrade ; Marcelo B. Lima; Inakã S. Barreto; Mário C. U. de Araújo; Luciano F. Almeida

A micro-flow-batch analyzer for sulfite determination in wines, whiskies, vodkas and beers.


Published online: December 13, 2018.

Articles J. Braz. Chem. Soc. 2018

Influence of Seasonality and Sunlight Effects on Rollinia mucosa Leaves Fingerprint

Sabrina Afonso; Fabiano B. Silva; Gustavo G. Marcheafave; Pedro H. Hatumura; Roy E. Bruns; Ieda S. Scarminio

Fingerprinting analytical techniques associated with chemometric analysis and mixture design enabled the chemical discrimination of the sun-exposed and self-shaded leaves of Rollinia mucosa in each of the four seasons.


Published online: December 13, 2018.

J. Braz. Chem. Soc. 2018

Facial Selectivity between Carbohydrates and Aromatic Amino Acids Explained by a Combination of NCI, NBO and EDA Techniques with NMR Spectroscopy

Thiago C. Rozada ; Ulisses Z. de Melo ; Rodrigo M. Pontes; Roberto Rittner; Ernani A. Basso

Analysis of the intermolecular interactions between carbohydrates and aromatic amino acids through 1H nuclear magnetic resonance (NMR) and density functional theory (DFT) calculations, employing non-covalent interactions (NCI), natural bond orbital (NBO), and energy decomposition analyses (EDA) methodologies, showed the importance of the dispersion component of the intermolecular interaction for the recognition of carbohydrates by aromatic amino acids and the electrostatic component for the differentiation between the faces of the monosaccharide.


Published online: December 11, 2018.

Short Report J. Braz. Chem. Soc. 2018

A Novel Thermal Infrared Enthalpimetric Method for Fast, High-Throughput Determination of the Content Uniformity of Captopril Tablets

Flavia M. Dalla Nora; Alessandra S. Oliveira; Bruna N. Lucas; Daniele F. Ferreira; Fabio A. Duarte; Adilson B. Costa; Fabiana E. B. Silva; Juliano S. Barin

Captopril tablets were dissolved in the wells of a microplate. The reaction between captopril and iodine solutions releases heat and the temperature of solutions rise. Infrared thermal imaging was used for simultaneous temperature monitoring of several wells and the temperature increase was directly related to the amount of captopril.


Published online: December 11, 2018.

Review J. Braz. Chem. Soc. 2018

RM1 Semiempirical Model: Chemistry, Pharmaceutical Research, Molecular Biology and Materials Science

Nathalia B. D. Lima ; Gerd B. Rocha; Ricardo O. Freire; Alfredo M. Simas

This review on the RM1 model presents improvements to the methodology as well as a wide range of its applications to theoretical, organic, physical, analytical, and inorganic chemistry, along with their interfaces with medicine, biology, and materials science.


Published online: December 10, 2018.

Articles J. Braz. Chem. Soc. 2018

Identificaton of the Alarm and Sex Pheromones of the Leaf-Footed Bug, Leptoglossus zonatus (Heteroptera: Coreidae)

Katia M. Inoue; Diogo M. Vidal; Emir B. Saad; Camila B. C. Martins; Paulo H. G. Zarbin

Sex and alarm pheromones emitted by Leptoglossus zonatus adults and nymphs.


Published online: December 10, 2018.

J. Braz. Chem. Soc. 2018

Seasonal and Circadian Study of a Thymol/γ-Terpinene/p-Cymene Type Oil of Ocimum gratissimum L. and its Antioxidant and Antifungal Effects

Joaquim A. M. de Castro ; Odair S. Monteiro; Denise F. Coutinho; Antonia A. C. Rodrigues; Joyce K. R. da Silva; José G. S. Maia

Ocimum gratissimum oil showed significant variation in its thymol/γ-terpinene/p-cymene chemotype during the seasonal and circadian studies. Probable synergistic action of these constituents contributes to the antioxidant and antifungal potential of the plant.


Published online: December 5, 2018.

J. Braz. Chem. Soc. 2018

Metal Contents and Pb Isotopes in the Surface Seawater of the Gulf of Prigi, Indonesia: Detection of Anthropogenic and Natural Sources

Anugrah Ricky Wijaya ; Bambang Semedi; Retno Ariadi Lusiana; Alrum Armid; Muntholib Muntholib

The level of metal contents of Ca, Fe, Mn, Cu, Pb and 207Pb / 206Pb vs. 208Pb / 206Pb in the Gulf of Prigi reflected by natural sources such as mineral sources from marine sediment.


Published online: November 22, 2018.

J. Braz. Chem. Soc. 2018

Inorganic and Organic Acids in the Atmosphere of the Urban Area of the City of Salvador, Brazil

Lícia P. S. Cruz ; Elisvan R. Mota; Vânia P. Campos; Franciele O. Santana; Sâmeque R. Luz; Daniela F. Santos

Organic and inorganic acids were measured in the air of Salvador City and correlations were identified between these acids, criteria air pollutants and meteorological parameters.


Published online: November 22, 2018.

J. Braz. Chem. Soc. 2018

The Role of L-Proline and Co-Catalysts in the Enantioselectivity of OXA‑Michael‑Henry Reactions

Lucas F. do Carmo; Simone C. Silva; Matheus V. Machado; Paloma S. Prata ; Alberto Wisniewski Júnior; Diogo M. Vidal; José Augusto F. P. Villar

In this work, it was carried out a study of the OXA-Michael-Henry reactions between salicylaldehyde and β-nitrostyrenes, catalyzed by L-proline. The corresponding (R)-3-nitro-2-phenyl-2H-chromenes were obtained in 25-55% enantiomeric excess (ee) (20 mol% L-proline) and 50-70% ee (stoichiometric amount) employing Ti(OiPr)4 as Lewis acid.


Published online: November 16, 2018.

J. Braz. Chem. Soc. 2018

Zinc Ferrite Nanoparticles via Coprecipitation Modified Method: Glycerol as Structure Directing and Stabilizing Agent

Edilan S. Lima; Luelc S. Costa; Gabrielle R. L. M. Sampaio; Edipo S. Oliveira; Erandir B. Silva; Hélio O. Nascimento; Ronaldo F. Nascimento ; Karine O. Moura; Moisés Bastos-Neto; Adonay R. Loiola ; José M. Sasaki

Glycerol proved to be efficient towards the synthesis of well crystalline zinc ferrite nanoparticles, with highlighted characteristics.


Published online: November 13, 2018.

J. Braz. Chem. Soc. 2018

Application of a Novel Ion-Imprinted Polymer to the Separation of Traces of CdII Ions in Natural Water: Optimization by Box-Behnken Design

Caio S. A. Felix; Jeferson A. Barreto; Cleber G. Novaes ; Fábio A. C. Amorim; Valfredo A. Lemos; Heloysa M. C. Andrade; Erik G. P. da Silva

A novel method for selective extraction of cadmium ions in water samples was performed using ion-imprinted polymer. Box-Behnken design was used in the optimization of the principal variables of pre-concentration.


Published online: November 13, 2018.

J. Braz. Chem. Soc. 2018

Investigation on Ruthenium(II) Bipyridine/AgIII Complexes Chemiluminescence System and Its Application for Sensitive Norfloxacin and Ofloxacin Detection

Jinjin Liu; Ling Ma; Tangjuan Zhao; Kaijie Yang; Hongmei Shi; Weijun Kang; Li Ma

A novel and sensitive flow-injection chemiluminescence (FI-CL) method was developed for the detection of norfloxacin (NFLX) and ofloxacin (OFLX) in commercial drug, milk and human urine samples based on AgIII-ruthenium(II) bipyridine in acidic solution.


Published online: November 9, 2018.

J. Braz. Chem. Soc. 2018

A Novel Colorimetric Immunoassay of Ultrasensitive Alpha-Fetoprotein Sensing in Magnetic Bead-Based Mimic Enzyme-Chromogenic Substrate System

Dan Su; Qiang Zeng; Bingwei Feng; Pengfei Xu; Baixi Shan; Yonggui Song

Top figure shows the H2O2-stimulated colorimetric assay for monitoring of glucose oxidase (GOx) activity and the bottom figure displays the mimic enzyme-chromogenic substrate-based colorimetric immunoassay (MECI) by coupling with the hemin/4-aminoatipyrine/phenol system.


Published online: November 8, 2018.

J. Braz. Chem. Soc. 2018

Comparative Study on Catalytic Dehydration of Glycerol with Alcohols

Guangxin Jia ; Wenlin Ma; Beibei He; Yifan Sun; Laishuan Liu

A comparative study of the dehydration of glycerol with alcohols over ion exchange resin Amberlyst-35 was performed. The effect of catalyst amounts, reaction temperature, time, and the molar ratio of alcohols to glycerol were also studied.


Published online: November 7, 2018.

J. Braz. Chem. Soc. 2018

New Composites CP@AC Based on Lanthanide Succinates

Guilherme C. Santos; Carlos A. F. de Oliveira; Fausthon F. da Silva ; Severino Alves Jr.

This work explores the synthesis and characterization of seven new composites based on lanthanide-succinates coordination polymers and activated carbon.


Published online: November 6, 2018.

J. Braz. Chem. Soc. 2018

Development and Validation of UHPLC-MS/MS for Simultaneous Determination of Scutellarin and Salicylic Acid in Rat Plasma: Application to Herb-Drug Pharmacokinetic Interaction Study

Guoliang Dai ; Jiandong Chen; Weidong Zhang; Yongtao Bai; Wen Jing; Ronghua Pan; Wenzheng Ju

This work showed that apparent herb-drug pharmacokinetic interaction existed between aspirin and dengzhanxixin injection, and the combination of aspirin and dengzhanxixin injection noticeably altered the absorption, distribution and disposition of salicylic acid.


Published online: November 6, 2018.

J. Braz. Chem. Soc. 2018

Integrative Analysis Based on HPLC-DAD-MS/MS and NMR of Bertholletia excelsa Bark Biomass Residues: Determination of Ellagic Acid Derivatives

Felipe M. A. da Silva ; Anna Carolina S. Hanna; Abraão A. de Souza; Francinaldo A. da Silva Filho; Olinda M. F. Canhoto; Alvicler Magalhães; Paulo J. C. Benevides; Mariangela B. M. de Azevedo; Antonio C. Siani; Adrian M. Pohlit; Afonso D. L. de Souza; Hector H. F. Koolen

The combination of nuclear magnetic resonance (NMR) and mass spectrometry (MS) to directly analyze crude extracts of Bertholletia excelsa bark residues indicated this biomass as a source of health-promoting compounds. Therefore, a potential raw material for food, pharmaceutical and chemical industries is described herein.


Published online: November 1, 2018.

J. Braz. Chem. Soc. 2018

Optimization of Atmospheric Pressure Photoionization for the Crude Oil Analysis Using Ultra-High Resolution Mass Spectrometry

Jandyson M. Santos ; Marcos A. Pudenzi; Alberto Wisniewski Jr.; Márcia C. Breitkreitz; Marcos N. Eberlin

Design of experiments was successfully applied to optimize atmospheric pressure photoionization (APPI)(±) Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) parameters for crude oil and its saturate, aromatic, resin and asphaltene (SARA) fractions analyses.


Published online: October 31, 2018.

J. Braz. Chem. Soc. 2018

Photochemical Synthesis of Gold Nanoparticles by Irradiation of Gold Chloride with the 2nd Harmonic of a Nd:YAG Laser

Henrique F. P. Barbosa; Miguel G. Neumann; Carla C. S. Cavalheiro

Irradiation of a HAuCl4 solution with the 532-nm emission of a pulsated Nd-YAG laser results in the production of pristine gold nanoparticles.


Published online: October 26, 2018.

J. Braz. Chem. Soc. 2018

Combination of Multi-Energy Calibration (MEC) and Laser-Induced Breakdown Spectroscopy (LIBS) for Dietary Supplements Analysis and Determination of Ca, Mg and K

Amanda S. Augusto; Jeyne P. Castro; Marco A. Sperança; Edenir R. Pereira‑Filho

Ablation process by laser-induced breakdown spectroscopy (LIBS) on dietary supplement surface and multi-energy calibration method (MEC).


Published online: October 22, 2018.

J. Braz. Chem. Soc. 2018

Zika Virus Activity of the Leaf and Branch Extracts of Tontelea micrantha and Its Hexane Extracts Phytochemical Study

Fernanda L. Ferreira; Marcela S. Hauck; Lucienir P. Duarte; José C. de Magalhães; Louise S. M. da Silva; Lúcia P. S. Pimenta; Julio C. D. Lopes; Maria O. Mercadante‑Simões; Sidney A. Vieira Filho

The new friedelan-1,3,21-trione, nine known friedelanes, gutta-percha, squalene and a mixture of long-chain fatty acids were reported for the first time from Tontelea micrantha and also its genus. Its extracts inhibited Zika virus (ZIKV) multiplication at different stages, presenting a high virucidal effect.


Published online: October 18, 2018.

J. Braz. Chem. Soc. 2018

Black Carbon Associated to PM1.0 and PM2.5: Mass Variation due to Combustion of Biodiesel/Diesel Blends (B5, B6, B7 and B8)

Carlos R. da Silva Junior; Bruno R. L. Lemos; Jurandir P. Pinto; Ismael R. Amador; Maria Cristina Solci

Before and after fine particulate matter on filter samples inside a bus station.


Published online: October 17, 2018.

J. Braz. Chem. Soc. 2018

Use of FTIR-ATR Spectroscopy Combined with Multivariate Analysis as a Screening Tool to Identify Adulterants in Raw Milk

Daniele G. Conceição; Ben-Hur R. F. Gonçalves; Fernanda F. da Hora; Amanda S. Faleiro; Leandro S. Santos; Sibelli P. B. Ferrão

Study of the use of Fourier transform infrared spectroscopy combined with multivariate analysis to identify adulterations in raw milk and in samples from producers.


Published online: October 15, 2018.

J. Braz. Chem. Soc. 2018

Deracemization of sec-Alcohols through Sequential Application of C. albicans and Ketoreductases

Fábio D. Nasário; Paulo J. S. Moran; José Augusto R. Rodrigues

A biocatalytic cascade process was developed using the yeast Candida albicans CCT 0776 and a commercially available ketoreductase to promote deracemization of (±)-1-arylethanols, in high substrate concentration (above 100 mmol L-1), to prepare the (R)-alcohols (90-99%), with a high enantiomeric excess (83-99%) after 2-19 h.


Published online: October 11, 2018.

J. Braz. Chem. Soc. 2018

Dispersive Solid Phase Extraction Headspace Sampling in Gas Chromatography-Mass Spectrometric Analysis of Volatiles: Application to Separation of Polycyclic Aromatic Hydrocarbons

Zahra Ramezani; Fatemeh Kardani; Nadereh Rahbar; Ahmad Babapoor; Fariba Bahrami

Dispersive solid phase extraction combined with headspace sampling was introduced and applied to separation and pre-concentration of polycyclic aromatic hydrocarbons (PAHs).


Published online: October 8, 2018.

J. Braz. Chem. Soc. 2018

Insights on Structuration of Peroxotungstic Acid in Aqueous Media

Julia C. O. Pazinato; Marcos A. Villetti; Omar Mertins; Emerson R. Silva; Irene T. S. Garcia

The intensity of pyrene fluorescence bands increases with increasing sodium dodecyl sulfate (SDS) concentration, overriding the suppressive effect of peroxotungstic acid (PTA). The image at left shows small angle X-ray scattering curve for PTA/NaCl/SDS/ethanol/water and the resulting fractal structured films.


Published online: October 2, 2018.

J. Braz. Chem. Soc. 2018

Cr3+ Doped Al2O3 Obtained by Non-Hydrolytic Sol-Gel Methodology

José M. A. Caiut; Nolwen Floch; Younès Messaddeq; Omar J. de Lima; Lucas A. Rocha; Katia J. Ciuffi; Eduardo J. Nassar; Geraldo R. Friedermann; Sidney J. L. Ribeiro

The non-hydrolytic sol-gel route is a single methodology to obtain different host for applications as light emission. The ruby and other semi-precious stones can be obtained by sol-gel methodology. The luminescence spectra indicated the octahedral symmetry of the chromium(III) ion replacing aluminum(III) ion in the alumina matrix.


Published online: October 2, 2018.

J. Braz. Chem. Soc. 2018

Human Hair as Adsorbent of Palladium(II) in Solution: A Precursor of Well-Dispersed Size-Controlled Pd Nanoparticles

Fernanda G. Mendonça; Thaís G. Silva; Gustavo M. do Nascimento; Humberto O. Stumpf; Raquel V. Mambrini; Walace D. do Pim

Human hair was used as an efficient adsorbent for palladium(II) in solution and, after a mild thermal treatment, well-dispersed Pd nanoparticles were obtained.


Published online: October 1, 2018.

J. Braz. Chem. Soc. 2018

New Synthesis Method for a Core-Shell Composite Based on α-Bi2O3@PPy and its Electrochemical Behavior as Supercapacitor Electrode

Fárlon F. S. Xavier; Carlos G. O. Bruziquesi; Wélique S. Fagundes; Elaine Y. Matsubara; José M. Rosolen; Adilson C. Silva; Sheila C. Canobre; Fábio A. Amaral

New α-Bi2O3@PPy core-shell hybrid composite based on polypyrrole (PPy) electropolymerized with ordered α-Bi2O3, which intensified the electrochemical properties, making it promising for supercapacitor application.


Published online: September 27, 2018.

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