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0:44, Mon Aug 26

Open Access/APCs

Forthcoming Papers Brazilian Women in Chemistry

Articles published online ahead of print




Articles J. Braz. Chem. Soc. 2019

Analysis of the Seasonal Variation in Chemical Profile of Piper glabratum Kunth Essential Oils using GC×GC/qMS and Their Antioxidant and Antifungal Activities

Anaí L. dos Santos; Allan S. Polidoro; Cláudia A. L. Cardoso; Jonas S. Mota; Rosângela A. Jacques; Elina B. Caramão

The influence of seasonality on chemical composition, antioxidant and antifungal activities of Piper glabratum essential oils was evaluated. The two-dimensional gas chromatography coupled with quadrupole mass spectrometry (GC×GC/qMS) allowed the detailed chemical characterization and the oils showed biological activities. Composition and activities were influenced by seasonality.

http://dx.doi.org/10.21577/0103-5053.20190196

Published online: August 20, 2019.
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J. Braz. Chem. Soc. 2019

Nanoparticles of Fe2O3 and Co3O4 as Efficient Electrocatalysts for Oxygen Reduction Reaction in Acid Medium

Ismael C. B. Alves; José R. N. Santos; Deracilde S. S. Viégas; Edmar P. Marques; Cristina A. Lacerda; Lei Zhang; Jiujun Zhang; Aldaléa L. B. Marques

Oxygen reduction reaction (ORR) catalyzed by nanoparticles of Fe2O3 and Co3O4 applied on the surface of a glassy carbon electrode (GCE).

http://dx.doi.org/10.21577/0103-5053.20190195

Published online: August 19, 2019.
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J. Braz. Chem. Soc. 2019

Silica/Titania Graphite Composite Modified with Chitosan and Tyrosinase Employed as a Sensitive Biosensor for Phenolic Compounds

Marina T. Laranjo; Franciele M. Morawski; Silvio L. P. Dias; Edilson V. Benvenutti; Leliz T. Arenas; Tania M. H. Costa

Biosensor based on new carbon ceramic electrode prepared with silica-titania/graphite composite and modified with chitosan for tyrosinase immobilization.

http://dx.doi.org/10.21577/0103-5053.20190190

Published online: August 12, 2019.
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J. Braz. Chem. Soc. 2019

Light Response of Three Water-Soluble MnI PhotoCORMs: Spectroscopic Features and CO Release Investigation

Vitor C. Weiss; André L. Amorim; Fernando R. Xavier; Adailton J. Bortoluzzi; Ademir Neves; Rosely A. Peralta

Water-soluble MnI compounds release CO when exposed to light. The proposed mechanism occurs in two steps, with photo and redox processes.

http://dx.doi.org/10.21577/0103-5053.20190183


J. Braz. Chem. Soc. 2019

Photochemical Synthesis of Ag and Au Nanoparticles Using a Thioxanthone Substituted Chitosan as Simultaneous Photoinitiator and Stabilizer

Silvano R. Valandro; Alessandra L. Poli; Miguel G. Neumann; Carla C. Schmitt

Silver and gold nanoparticles were formed by irradiating the metal salt in the presence of a thioxanthone-derivated chitosan that acts as photoinitiator and stabilizer.

http://dx.doi.org/10.21577/0103-5053.20190182

Published online: August 6, 2019.
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J. Braz. Chem. Soc. 2019

Cardol-Derived Organophosphorothioates as Inhibitors of Acetylcholinesterase for Dengue Vector Control

Mayara O. Almeida; Thayllan T. Bezerra; Nayane M. A. Lima; Anderson F. Sousa; Maria T. S. Trevisan; Viviane G. P. Ribeiro; Diego Lomonaco ; Selma E. Mazzetto

Larvicidal action of organophosphorothioates derived from cardol through inhibition of the acetylcholinesterase enzyme.

http://dx.doi.org/10.21577/0103-5053.20190181

Published online: August 6, 2019.
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J. Braz. Chem. Soc. 2019

Kaolinite/TiO2/cobalt(II) Tetracarboxymetallophthalocyanine Nanocomposites as Heterogeneous Photocatalysts for Decomposition of Organic Pollutants Trimethoprim, Caffeine and Prometryn

Tiago H. da Silva; Anderson O. Ribeiro; Eduardo J. Nassar ; Raquel Trujillano; Vicente Rives; Miguel A. Vicente; Emerson H. de Faria; Katia J. Ciuffi

Nanocomposites kaolinite/TiO2/phthalocyanine and molecular structures of organic pollutants used in photodegradation studies.

http://dx.doi.org/10.21577/0103-5053.20190178

Published online: July 31, 2019.
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J. Braz. Chem. Soc. 2019

Nanostructured Systems Obtention Using LbL Self-Assembly or the Cysteine-Assisted Adsorption Method and Their Application as a Water Splitting Single Catalyst

Rhauane A. Galvão ; Paloma B. Barreto; Thiago A. S. Soares ; Letícia B. V. Sales; Jeice M. dos Santos; Larissa A. de Santa-Cruz; Tassia S. Seeger ; Fabio A. Duarte ; Germana M. M. Silva; Giovanna Machado

Titanium dioxide nanotubes were obtained through anodization, and its surface was modified through layer-by-layer (LbL) self-assembly or cysteine adsorption to attach gold ions, which were reduced in Au(0) to be used as photocatalysts for hydrogen production.

http://dx.doi.org/10.21577/0103-5053.20190176

Published online: July 30, 2019.
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J. Braz. Chem. Soc. 2019

Synthesis of Hybrid Monolithic Columns Using a Click Chemistry Reaction for Application in Capillary Liquid Chromatography

Marcella E. P. Schmidt; Carla B. G. Bottoli

Synthesis of a hybrid monolith using a thiol-ene click chemistry reaction, for use in capillary liquid chromatography.

http://dx.doi.org/10.21577/0103-5053.20190174

Published online: July 26, 2019.
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J. Braz. Chem. Soc. 2019

Feasibility of a New Method for Identification and Discrimination of Gunshot Residues by Total Reflection X-Ray Fluorescence and Principal Component Analysis

Luisa P. Ferreira; Clésia C. Nascentes ; Frederico N. Valladão; Rogério A. Lordeiro

A simple and innovative method to identify gunshot residues and discriminate ammunition of six different calibers employing total reflection X-ray fluorescence (TXRF) and chemometric tools.

http://dx.doi.org/10.21577/0103-5053.20190173

Published online: July 25, 2019.
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J. Braz. Chem. Soc. 2019

Multi-Energy Calibration: A Practical Method for Determination of Macro and Micro Nutrients in Meat by ICP OES

Julymar M. Higuera ; Ana Beatriz S. Silva ; Ana Rita A. Nogueira

Multi-energy calibration (MEC) was successfully employed to nutrients determination in beef and meats of sheep and chicken by inductively coupled plasma optical spectrometry (ICP OES).

http://dx.doi.org/10.21577/0103-5053.20190171

Published online: July 23, 2019.
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J. Braz. Chem. Soc. 2019

Acid Hydrolysis of Regular Corn Starch under External Electric Field

Nádya P. da Silveira ; Roberta Zucatti; Andrielle D. Vailatti; Daiani C. Leite

Acid hydrolysis of regular corn starch under external electric field greatly reduces the reaction time and increases starch crystallinity. Amylose and amylopectin are depicted in light and dark pink, respectively.

http://dx.doi.org/10.21577/0103-5053.20190168

Published online: July 23, 2019.
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J. Braz. Chem. Soc. 2019

Surface Silanization of Graphene Oxide Under Mild Reaction Conditions

Tiago Serodre; Norma A. P. Oliveira; Douglas R. Miquita; Max P. Ferreira; Adelina P. Santos; Valdirene G. Resende; Clascídia A. Furtado

Graphene oxide was silanized with (3-aminopropyl) triethoxysilane (APTES) using mild conditions. The resulting material was surface-modified, with the inclusion of amine and silanol groups.

http://dx.doi.org/10.21577/0103-5053.20190167

Published online: July 23, 2019.
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J. Braz. Chem. Soc. 2019

Improved Functionalization of Multiwalled Carbon Nanotubes in Ultra-Low Acid Volume: Effect of Solid/Liquid Interface

Vinícius G. Castro; Ingrid B. Costa; Felipe S. Medeiros; Éder J. Siqueira; Alexander H. Kasama; Kátia C. S. Figueiredo; Rodrigo L. Lavall; Glaura G. Silva

Functionalization of multiwalled carbon nanotubes (MWCNTs) with better structural quality was achieved by means of a more environmentally friendly process. Ultrasonic cavitation in lower liquid volume provided an enhanced preservation of MWCNT aspect ratio without compromising the functionalization extent.

http://dx.doi.org/10.21577/0103-5053.20190166

Published online: July 22, 2019.
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J. Braz. Chem. Soc. 2019

New Limonoids from Dictyoloma vandellianum and Sohnreyia excelsa: Chemosystematic Considerations

Claudenice F. P. Sartor; Maria da Paz Lima; Maria Fátima G. F. da Silva; João B. Fernandes; Moacir R. Forim; José R. Pirani

D. vandellianum afforded the new rearranged limonoid dictyolomin (1); S. excelsa the new cycloheptanyl ring C with carbonate, sohnreyolide (2).

http://dx.doi.org/10.21577/0103-5053.20190165

Published online: July 18, 2019.
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J. Braz. Chem. Soc. 2019

A Self-Assembled AMF-Responsive Nanoplatform Based on Pillar[5]arene and Superparamagnetic Nanoparticles for Controlled Release of Doxorubicin

Tamires S. Fernandes; Evelyn C. S. Santos; Vinicius G. C. Madriaga; Isabela A. A. Bessa; Vanessa Nascimento; Flávio Garcia; Célia M. Ronconi

Superparamagnetic nanoparticles functionalized with carboxylate-substituted pillar[5]arenes for chemo-hyperthermia therapy have been developed.

http://dx.doi.org/10.21577/0103-5053.20190164

Published online: July 17, 2019.
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Review J. Braz. Chem. Soc. 2019

(Bio)conjugation Strategies Applied to Fluorescent Semiconductor Quantum Dots

Goreti Pereira; Camila A. P. Monteiro; Gabriela M. Albuquerque; Maria I. A. Pereira; Mariana P. Cabrera; Paulo E. Cabral Filho; Giovannia A. L. Pereira; Adriana Fontes; Beate S. Santos

In this review we present the state of the art of (bio)conjugation strategies applied to semiconductor quantum dots for biomedical / bioanalytical purposes.

http://dx.doi.org/10.21577/0103-5053.20190163

Published online: July 16, 2019.
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Articles J. Braz. Chem. Soc. 2019

Medicinal Electrochemistry of Halogenated and Nitrated Pterocarpanquinones

Thaissa L. Silva; Julio C. S. da Silva; Dimas J. P. Lima; Fabricia R. Ferreira; Camila C. de Vasconcelos; Danyelle C. Santos; Chaquip D. Netto; Paulo R. R. Costa; Marília O. F. Goulart

Electrochemical data were obtained, in aprotic media, regarding reduction mechanism, reactivity with oxygen and analysis of the electrogenerated intermediates. Together with computational studies, data were useful in explaining the reactivity/biological activity of halogenated and nitrated pterocarpanquinones.

http://dx.doi.org/10.21577/0103-5053.20190161

Published online: July 16, 2019.
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J. Braz. Chem. Soc. 2019

Effects of Light Quality and Chemical Elicitors on the Growth Parameters and Rosmarinic Acid Content of in vitro Cultures of Hyptis pectinata (L.) Poit.

Rita C. N. Pedroso; Leticia. P. Pimenta; Marcos G. Tozatti; Núbia A. A. Branquinho; Alessandra C. B. A. M. Hara; Fernando H. L. Silva; Alan C. Costa; Fabiano G. Silva; Carlos E. S. Miranda; Marcio L. A. Silva; Wilson R. Cunha; Patricia M. Pauletti; Ana. H. Januario

The influence of light quality and the chemical elicitors salicylic acid and silver nitrate on the rosmarinic acid content and growth parameters of Hyptis pectinata.

http://dx.doi.org/10.21577/0103-5053.20190159

Published online: July 15, 2019.
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J. Braz. Chem. Soc. 2019

New Metal-Organic Systems with a Functionalized Oxamate-Type Ligand and MnII, FeII, CuII and ZnII

Jhonny W. Maciel; Lucas H. G. Kalinke; Ana K. Valdo; Felipe T. Martins; Renato Rabelo; Nicolás Moliner; Joan Cano; Miguel Julve; Francesc Lloret; Danielle Cangussu

The synthesis and characterization of the compounds [Fe(H2pcpa)2(H2O)2] (1), {[Mn(Hpcpa)(H2O)3]1/2H2O}n (2), {[Zn(Hpcpa)(H2O)3]1/2H2O}n (3) and [Cu2(Hpcpa)2(bipy)2]8H2O (4) [H3pcpa = N-(4-carboxyphenyl)oxamic acid; bipy = 2,2'-bipyridine] together with the magnetic study of 1, 2 and 4.

http://dx.doi.org/10.21577/0103-5053.20190158

Published online: July 12, 2019.
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J. Braz. Chem. Soc. 2019

Essential Oils from Croton Species: Chemical Composition, in vitro and in silico Antileishmanial Evaluation, Antioxidant and Cytotoxicity Activities

Selene M. Morais; Danyelle S. Cossolosso; Antonio A. S. Silva; Manoel O. de Moraes Filho; Maria J. Teixeira; Claudio C. Campello; Oriel H. Bonilla; Valdir F. de Paula Júnior; Nadja S. Vila-Nova

Antileishmanial Croton species and main compounds (1,8-cineole and spathulenol) showed high affinity for the catalytic site of the enzyme Leishmania infantum trypanothione reductase.

http://dx.doi.org/10.21577/0103-5053.20190155

Published online: July 11, 2019.
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Review J. Braz. Chem. Soc. 2019

The Research on Porphyrins and Analogues in Brazil: A Small Review Covering Catalytic and other Applications since the Beginning at Universidade de São Paulo in Ribeirão Preto until the Joint Venture between Brazilian Researchers and Colleagues from Universidade de Aveiro, Portugal

Shirley Nakagaki ; Kelly A. D. F. Castro; Maria da Graça P. M. S. Neves; Maria do Amparo Faustino; Yassuko Iamamoto

The aim of this review is to provide insight into porphyrin chemistry research in Brazilian institutions, especially that involving catalytic purposes, and discuss some advances achieved in the topic with the collaboration of researchers from the Universidade de Aveiro, Portugal.

http://dx.doi.org/10.21577/0103-5053.20190153

Published online: July 4, 2019.
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Articles J. Braz. Chem. Soc. 2019

Development of an Analytical Method for the Determination of Metals in Chicken Breast by Microwave Induced Plasma Optical Emission Spectrometry (MIP-OES)

Ane Martiele T. P. Pinto; Ana Carla S. Boeira; Meibel T. Lisboa; Aline L. Medina; Anderson S. Ribeiro; Mariana A. Vieira

The concentrations of Al, Ca, Cd, Cr, Cu, Fe, Hg, K, Mg, Na and Zn in chicken breast samples were determined by microwave induced plasma optical emission spectrometry (MIP-OES).

http://dx.doi.org/10.21577/0103-5053.20190151

Published online: July 2, 2019.
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J. Braz. Chem. Soc. 2019

Effect of the Incorporation of Sugarcane Bagasse Biochar in Leaching and Bioavailability of Clomazone in Soil

Marcos R. F. da Silva; Maria E. L. R. de Queiroz ; Antônio A. Neves ; Antônio A. da Silva; André F. de Oliveira; Renan L. de Oliveira; Mariane M. Azevedo; Gustavo A. M. Pereira

Clomazone exhibits leaching potential and could contaminate deep layers of soil profile and groundwater. Leaching of the herbicide was evaluated in authentic soil and in soil that received incorporation of biochar. The percolation of clomazone through the soil layers was evaluated by a validated chromatographic method and its bioavailability by a greenhouse assay.

http://dx.doi.org/10.21577/0103-5053.20190149

Published online: July 2, 2019.
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J. Braz. Chem. Soc. 2019

A Sustainable Methodology to Extract Bismuth from Secondary Sources

Maria C. Hespanhol ; Pamela R. Patrício; Luis H. M. da Silva; Silvia J. R. Vargas; Teresa C. S. Rezende; Raquel A. Campos

Green recovery of bismuth from fusible plugs of gas cylinders was performed with three consecutive extractions using L35 + NH4NO3 + H2O aqueous two-phase system, without any extractant. Bismuth was obtained with high purity (94.7%), resulting in the recovery of the 38.5 g of bismuth per 1.00 kg of fusible plug.

http://dx.doi.org/10.21577/0103-5053.20190147

Published online: June 28, 2019.
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J. Braz. Chem. Soc. 2019

Experimental and Computational Studies of the Adsorption of Furan, Pyrrole, and Thiophene on Hydroxyapatites in a Single and Ternary Component

Mayara S. Oliveira; Stefane N. Costa; Norberto K. V. Monteiro; Pedro L. Neto; Guilherme A. Magalhães Junior;
Izaura C. N. Diógenes ; Rinaldo S. Araújo; Elisane Longhinotti

Monte Carlo simulation explains adsorption of furan, pyrrole, and thiophene on hydroxyapatite.

http://dx.doi.org/10.21577/0103-5053.20190146

Published online: June 26, 2019.
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J. Braz. Chem. Soc. 2019

Use of Carbon Dots Synthesized from Citrate as a Fluorescent Probe for Quercetin Determination in Tea and Beer Samples

Nattany T. G. de Paula ; Raquel Milani; André F. Lavorante; Ana Paula S. Paim

Carbon dots (CDs) were prepared by a one-step hydrothermal method and were employed for determination of quercetin in teas and beers. The fluorescence quenching of CDs was proportional to the concentration of quercetin.

http://dx.doi.org/10.21577/0103-5053.20190145

Published online: June 25, 2019.
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J. Braz. Chem. Soc. 2019

A New Electrochemical Platform Based on a Polyurethane Composite Electrode Modified with Magnetic Nanoparticles Coated with Molecularly Imprinted Polymer for the Determination of Estradiol Valerate in Different Matrices

Bruna Bergamin; Rafael R. Pupin; Ademar Wong; Maria D. P. T. Sotomayor

Development of electrochemical sensor using magnetic nanoparticles coated with molecularly imprinted polymer (MIP) for selective and sensible detection of estradiol valerate in different matrices.

http://dx.doi.org/10.21577/0103-5053.20190142

Published online: June 21, 2019.
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Review J. Braz. Chem. Soc. 2019

Vibrational Spectroscopy and Chemometrics in Forensic Chemistry: Critical Review, Current Trends and Challenges

Carolina S. Silva; André Braz; Maria Fernanda Pimentel

The symbiotic relation between vibrational spectroscopy and chemometrics in forensic chemistry contexts.

http://dx.doi.org/10.21577/0103-5053.20190140

Published online: June 18, 2019.
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Articles J. Braz. Chem. Soc. 2019

Halogen Determination in Polymeric Waste of Electrical and Electronic Equipment: Overcoming Limitations in Sample Preparation

Jussiane S. Silva; Gabrielle D. Iop; Rodrigo M. Pereira ; Marcia F. Mesko ; Lisarb O. Diehl; Erico M. M. Flores; Paola A. Mello

A critical evaluation of digestion methods for polymeric parts of waste of electrical and electronic equipment was carried out for further determination of halogens.

http://dx.doi.org/10.21577/0103-5053.20190137

Published online: June 13, 2019.
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J. Braz. Chem. Soc. 2019

SBSE(EG-Silicone)-UFLC-MS/MS and HPLC-Flu Analysis of Norharman in Passiflora edulis Rinds

Vítor F. Freire ; Renata Colombo; Janete H. Yariwake

Norharman was identified and quantified in Passiflora edulis rinds by ultra-fast liquid chromatography coupled to tandem mass spectrometry (UFLC-MS/MS) and a stir bar sorptive extraction with a copolymer of polydimethylsiloxane and polyethylene glycol as stationary phase and high performance liquid chromatography with fluorescence detection (SBSE(EG-Silicone)-HPLC-Flu) method.

http://dx.doi.org/10.21577/0103-5053.20190136

Published online: June 12, 2019.
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J. Braz. Chem. Soc. 2019

Modification of Chitosan by Zincke Reaction: Synthesis of a Novel Polycationic Chitosan-Pyridinium Derivative

Fernanda J. Gonçalves; Rossimiriam P. Freitas

Chitosan was modified by converting its amino group at C-2 into a pyridinium ring, for the first time, via Zincke reaction.

http://dx.doi.org/10.21577/0103-5053.20190135

Published online: June 11, 2019.
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J. Braz. Chem. Soc. 2019

On-Flow Ligand Screening Assay Based on Immobilized Nucleoside Diphosphate Kinase B from Homo sapiens

Juliana M. Lima; Claudia Seidl; Elise M. F. Cunha; Arthur H. C. Oliveira; Carmen L. Cardoso

Two-dimensional on-flow zonal affinity-based chromatography assay for nucleoside diphosphate kinase B.

http://dx.doi.org/10.21577/0103-5053.20190133

Published online: June 7, 2019.
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J. Braz. Chem. Soc. 2019

Antimicrobial Effects of Silver(I) and Bismuth(III) Complexes with Secnidazole‑Derived Schiff Base Ligands: the Role of the Nitro Group Reduction

Ana P. A. Oliveira; João F. G. Ferreira; Luiz M. Farias; Paula P. Magalhães; Leticia R. Teixeira; Heloisa Beraldo

Silver(I) and bismuth(III) complexes with secnidazole-derived ligands show anti anaerobic bacteria activity. Silver(I) complexes exhibit antifungal effects.

http://dx.doi.org/10.21577/0103-5053.20190130

Published online: June 6, 2019.
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J. Braz. Chem. Soc. 2019

Comparison of Volatile Profile and Antioxidant Activity of Piper divaricatum G. Meyer (Piperaceae) Using Cuttings and Cell Tissue

Rosana Corpes; Lidiene Monteiro; Eloísa H. Andrade; José G. Maia; Ilmarina Menezes; William N. Setzer; Alessandra R. Ramos; Joyce K. R. da Silva

Piper divaricatum plants propagated by cuttings and cell tissue had the same volatile profile, phenolic content and similar antioxidant activity.

http://dx.doi.org/10.21577/0103-5053.20190128

Published online: June 6, 2019.
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J. Braz. Chem. Soc. 2019

Physicochemical Study of the Interaction between Gold Nanoparticles and Lipase from Candida sp. (CALB): Insights into the Nano-Bio Interface

Heloise R. de Barros; Mary C. Santos; Leandro R. S. Barbosa; Leandro Piovan; Izabel C. Riegel-Vidotti

The interaction between lipase from Candida sp. and gold nanoparticles was fully investigated at different length scales revealing important information about the nano-bio interface of this bio-conjugate, as seen by transmission electron microscopy (TEM) images.

http://dx.doi.org/10.21577/0103-5053.20190127

Published online: June 6, 2019.
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J. Braz. Chem. Soc. 2019

Compatibility of GROMOS-Derived Atomic Parameters for Lipopolysaccharide Membranes with the SPC/E Water Model and Alternative Long-Range Electrostatic Treatments Using Single Nonbonded Cutoff and Atom-Based Charge Schemes

Manoela P. M. Lima; Manuela Nader; Denys E. S. Santos; Thereza A. Soares

The effect of water models, long-range electrostatics treatment and charge cutoff schemes on atomistic molecular dynamics (MD) simulations of bacterial outer membranes with the GROMOS force field.

http://dx.doi.org/10.21577/0103-5053.20190119

Published online: May 29, 2019.
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Review J. Braz. Chem. Soc. 2019

Raman Imaging Spectroscopy: History, Fundamentals and Current Scenario of the Technique

Hery Mitsutake; Ronei J. Poppi; Márcia C. Breitkreitz

Representation of a Raman imaging experiment: the spectral array of data and the univariate/multivariate data treatment for the generation of chemical images.

http://dx.doi.org/10.21577/0103-5053.20190116

Published online: May 24, 2019.
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Articles J. Braz. Chem. Soc. 2019

Facile One-Step Electrodeposition Fabrication of Amorphous MoS2 Catalysts in Titanium for Hydrogen Evolution Reaction

Marina Medina ; Patricia G. Corradini ; Lucia H. Mascaro

For Ti substrate the electron transfer rate is very fast, which should be responsible for the high activity of the catalyst. Hydrogen evolution reaction is more favorable on Ti/MoS2 than fluorine-tin doped oxide (FTO)/MoS2 decreasing the overpotential and Tafel slope.

http://dx.doi.org/10.21577/0103-5053.20190115

Published online: May 24, 2019.
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J. Braz. Chem. Soc. 2019

Thermal Stability and Kinetic of Decomposition of Mono- and Dicationic Imidazolium-Based Ionic Liquids

Caroline R. Bender; Bruna L. Kuhn; Carla A. A. Farias; Francieli I. Ziembowicz; Thaíssa S. Beck; Clarissa P. Frizzo

Phase transitions, thermal stability, kinetics, and activation parameters of degradation of imidazolium-based ionic liquids were evaluated.

http://dx.doi.org/10.21577/0103-5053.20190114

Published online: May 24, 2019.
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J. Braz. Chem. Soc. 2019

Chlorine and Fluorine Determination in Eye-Pencil: Development of an Eco‑Friendly Sample Preparation Method for Ion Chromatography Analysis

Marcia F. Mesko ; Vanize C. Costa; Rodrigo M. Pereira ; Carla A. Hartwig

An eco-friendly method was developed for chlorine and fluorine determination in eye-pencil, combining microwave-induced combustion (MIC) for sample preparation with ion chromatography (IC) for the element determination.

http://dx.doi.org/10.21577/0103-5053.20190113

Published online: May 24, 2019.
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J. Braz. Chem. Soc. 2019

Catalytic Transformation Conditions of Ethanol on Dealuminated BEA Zeolites

Maria Clara H. Clemente; Deborah S. Valadares; André B. Lacava; Lais S. Barbosa; Gesley A. V. Martins; José A. Dias;
Sílvia C. L. Dias

The image is a representation of porous of BEA zeolite after reaction with ammonium hexafluorosilicate (AHFS), showing the formation of bigger extra-framework aluminum (EFAL) species without washing, and the respective washing procedure, as well as product selectivity depending on weight hourly space velocity (WHSV).

http://dx.doi.org/10.21577/0103-5053.20190109

Published online: May 23, 2019.
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J. Braz. Chem. Soc. 2019

Degradation of Acid Red 8 Dye Using Photo-Fenton Reaction Mediated by Titanium Modified Catalysts

André C. Bento; Elissandro S. Emídio; Peter Hammer; Raquel F. P. Nogueira

Dye degradation mediated by titanium free catalyst occurs mostly in homogeneous phase while with molar ratio Ti/Fe = 0.4 heterogeneous process is predominant at pH 5.6.

http://dx.doi.org/10.21577/0103-5053.20190104

Published online: May 21, 2019.
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J. Braz. Chem. Soc. 2019

Gold Catalysis for Selective Hydrogenation of Aldehydes and Valorization of Bio‑Based Chemical Building Blocks

Rerison J. M. Silva; Jhonatan L. Fiorio; Pedro Vidinha; Liane M. Rossi

Gold catalysts activated by Lewis bases are highly selective for the hydrogenation of bio-derived aldehydes into alcohols, such as 2,5-dihydroxymethylfuran (DHMF).

http://dx.doi.org/10.21577/0103-5053.20190103

Published online: May 21, 2019.
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J. Braz. Chem. Soc. 2019

Linear Peptide Analogues from Jatropha's Orbitides Promote Migration of Human Neonatal Foreskin Fibroblasts in vitro and Collagen Deposition

Suelem D. Ramalho ; Meri Emili F. Pinto ; Renata K. Andricopulo; Paulo R. S. Sanches; Edilberto R. Silveira ; Eduardo M. Cilli; Adriano D. Andricopulo; Vanderlan S. Bolzani

Linear pohlianin B and linear ribifolin are peptide analogues originally designed from natural orbitides. The promising results demonstrated that they have the potential to induce neonatal human foreskin fibroblast migration and collagen deposition.

http://dx.doi.org/10.21577/0103-5053.20190102

Published online: May 21, 2019.
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Articles J. Braz. Chem. Soc. 2019

Oxone®-Promoted One-Pot Synthesis of 1-Aryl-4-(organylselanyl)-1H-pyrazoles

Raquel G. Jacob ; Daniela H. de Oliveira; Thiago J. Peglow; José E. R. Nascimento; Ricardo H. Bartz

The one-pot synthesis of 4-organylselanylpyrazoles from 1,3-diketones, hydrazines and diaryl diselenides using Oxone® was developed.

http://dx.doi.org/10.21577/0103-5053.20190094

Published online: May 15, 2019.
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J. Braz. Chem. Soc. 2019

Determination of Amino Acids in Plasma Samples of Preeclampsia Patients by Liquid Chromatography Coupled to High-Resolution Mass Spectrometry

Eliane do Nascimento; Helvécio C. Menezes; Rodrigo R. Resende; Vânia A. M. Goulart; Zenilda L. Cardeal

The analysis of plasma samples from pregnant women with preeclampsia and healthy pregnancies by liquid chromatography coupled to high-resolution mass spectrometry shows that there are significant differences between samples in the levels of some free amino acids.

http://dx.doi.org/10.21577/0103-5053.20190093

Published online: May 14, 2019.
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J. Braz. Chem. Soc. 2019

Tianeptine Esters Derivatives: A Study of Protein-Drug Interaction Performed by Fluorescence Quenching and Molecular Docking

Franciela A. Soares; Marco A. Ceschi; Daniel B. Franceschini; Vanessa P. do Canto; Paulo A. Netz; Leandra F. Campo

The antidepressant tianeptine and its esters induce the fluorescence quenching of BSA due to the proximity to Trp134 and Trp213 amino acids as revealed by molecular modeling.

http://dx.doi.org/10.21577/0103-5053.20190090

Published online: May 14, 2019.
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J. Braz. Chem. Soc. 2019

Are Imidazoles Versatile or Promiscuous in Reactions With Organophosphates? Insights From the Case of Parathion

Valmir B. Silva; Elisa S. Orth

Imidazole reacts differently with various organophosphates, including an unusual N-alkylation. This promiscuity boosts the versatility of imidazoles.

http://dx.doi.org/10.21577/0103-5053.20190084

Published online: May 8, 2019.
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Review J. Braz. Chem. Soc. 2019

Aspergillus niger: A Hundred Years of Contribution to the Natural Products Chemistry

Mary Anne S. Lima ; Maria da Conceição F. de Oliveira; Antônia T. Á. Pimenta; Paula K. S. Uchôa

This review celebrates the centenary of chemical investigations on Aspergillus niger. Structurally diverse secondary metabolites produced by this fungus, besides its potential on selective biotransformation of terpenes, are presented.

http://dx.doi.org/10.21577/0103-5053.20190080

Published online: May 7, 2019.
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Articles J. Braz. Chem. Soc. 2019

Direct Assay to Evaluate Phosphoenolpyruvate Carboxykinase Activity

Bruno S. do Amaral; Katia Celina S. Correa; Arlene G. Corrêa; Dulce H. F. de Souza; Quezia B. Cass

A typical direct assay for phosphoenolpyruvate carboxykinase by liquid chromatography-tandem mass spectrometry (LC-MS/MS) with phosphoenolpyruvate detection.

http://dx.doi.org/10.21577/0103-5053.20190079

Published online: May 3, 2019.
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Review J. Braz. Chem. Soc. 2019

Magneto-Responsive Hydrogels: Preparation, Characterization, Biotechnological and Environmental Applications

Emilli C. G. Frachini ; Denise F. S. Petri

Magneto-responsive hydrogels are important platforms for biomedical applications, such as drug delivery, tissue engineering and cancer therapy, and for environmental applications.

http://dx.doi.org/10.21577/0103-5053.20190074

Published online: April 26, 2019.
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Articles J. Braz. Chem. Soc. 2019

Iridium-Based Catalysts for the Ethanol Electrooxidation in Acidic Media

Fabiano R. P. da Silva; Luiz C. Silva-Junior; Giuseppe A. Camara; Martha Janete Giz

IrRh surfaces are selective to CO2 production (from ethanol), while IrRhSn promotes the occurrence of a dual oxidation pathway that also generates acetic acid.

http://dx.doi.org/10.21577/0103-5053.20190072

Published online: April 25, 2019.
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J. Braz. Chem. Soc. 2019

Integrated Chemometric Approach to Optimize Sample Preparation for Detecting Metabolic Changes Provoked by Abiotic Stress in Coffea arabica L. Leaf Fingerprints

Gustavo G. Marcheafave; Cláudia D. Tormena ; Sabrina Afonso; Miroslava Rakocevic; Roy E. Bruns; Ieda S. Scarminio

Fingerprinting provides an indication of the changes in regulatory metabolites in leaves provoked by water-deficit stress by means of an integrated chemometric approach. Fermentation, nutritional deficiencies, senescence and abscission were prevalent in unirrigated plants.

http://dx.doi.org/10.21577/0103-5053.20190068

Published online: April 23, 2019.
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J. Braz. Chem. Soc. 2019

Electrode Modified with the Ionic Liquid [P6,6,6,14+]2[MnCl42–] for the Determination of Bisphenol A in Plastic Samples

Tânia Regina Silva; Josias Merib; Daniel A. Spudeit; Eduardo Carasek ; Iolanda C. Vieira

Simple and fast electrode for determination of bisphenol A in plastic samples using a carbon paste electrode modified with ionic liquid.

http://dx.doi.org/10.21577/0103-5053.20190065

Published online: April 18, 2019.
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J. Braz. Chem. Soc. 2019

Gold Nanoparticles and [PEDOT-Poly(D,L-Lactic Acid)] Composite: Synthesis, Characterization and Application to H2O2 Sensing

Aruã C. da Silva; Marco A. O. S. Minadeo; Susana I. C. de Torresi

Synthesis of Au nanoparticles with poly(3,4-ethylenedioxythiophene)-poly(D,L-lactic acid) (PEDOT-PDLLA) composite was demonstrated, easily immobilizing films with conductive and biocompatible properties used as biointerface.

http://dx.doi.org/10.21577/0103-5053.20190063

Published online: April 15, 2019.
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Review J. Braz. Chem. Soc. 2019

DNA Damage by Endogenous and Exogenous Aldehydes

Marisa H. G. Medeiros

Formation and biological effects of deoxyribonucleic acid (DNA) adducts from endogenous and exogenous aldehydes.

http://dx.doi.org/10.21577/0103-5053.20190056

Published online: April 9, 2019.
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Articles J. Braz. Chem. Soc. 2019

A New Cytotoxic Naphthoquinone and Other Chemical Constituents of Sinningia reitzii

Adson S. Silva; Magali S. Amorim; Mariana M. Fonseca; Marcos J. Salvador; Eduardo L. de Sá; Maria Élida A. Stefanello

Three new naphthoquinones, including one with cytotoxic activity, were isolated from the tubers of Sinningia reitzii.

http://dx.doi.org/10.21577/0103-5053.20190054

Published online: April 4, 2019.
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Online version ISSN 1678-4790 Printed version ISSN 0103-5053
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