JBCS

3:50, Fri Apr 20

Open Access/APCs

Forthcoming Papers - 2018

Articles published online ahead of print




Articles 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.

http://dx.doi.org/10.21577/0103-5053.20180085

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.

http://dx.doi.org/10.21577/0103-5053.20180084

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.

http://dx.doi.org/10.21577/0103-5053.20180083

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.

http://dx.doi.org/10.21577/0103-5053.20180082

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.

http://dx.doi.org/10.21577/0103-5053.20180081

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.

http://dx.doi.org/10.21577/0103-5053.20180080

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.

http://dx.doi.org/10.21577/0103-5053.20180079

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.

http://dx.doi.org/10.21577/0103-5053.20180078

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.

http://dx.doi.org/10.21577/0103-5053.20180077

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.

http://dx.doi.org/10.21577/0103-5053.20180075

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.

http://dx.doi.org/10.21577/0103-5053.20180074

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.

http://dx.doi.org/10.21577/0103-5053.20180073

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.

http://dx.doi.org/10.21577/0103-5053.20180072

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.

http://dx.doi.org/10.21577/0103-5053.20180071

Published online: April 3, 2018.


J. Braz. Chem. Soc. 2018

Fit-for-Purpose ICP-MS Procedure Supporting Brazilian Regulations on Inorganic Constituents in Fresh and Saline Waters

Fernanda C. Pinheiro; Rodolfo Lorençatto; Ariane I. Barros; Clarice D. B. Amaral; Joaquim A. Nóbrega

Determination of 25 elements in fresh and sea water by inductively coupled plasma mass spectrometry (ICP-MS) in order to support four Brazilian regulations. High matrix introduction (HMI) system allowed sea water analysis with only 2-fold dilution.

http://dx.doi.org/10.21577/0103-5053.20180070

Published online: April 2, 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.

http://dx.doi.org/10.21577/0103-5053.20180069

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.

http://dx.doi.org/10.21577/0103-5053.20180068

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.

http://dx.doi.org/10.21577/0103-5053.20180067

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.

http://dx.doi.org/10.21577/0103-5053.20180066

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.

http://dx.doi.org/10.21577/0103-5053.20180065

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.

http://dx.doi.org/10.21577/0103-5053.20180064

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).

http://dx.doi.org/10.21577/0103-5053.20180063

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.

http://dx.doi.org/10.21577/0103-5053.20180062

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.

http://dx.doi.org/10.21577/0103-5053.20180061

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).

http://dx.doi.org/10.21577/0103-5053.20180060

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.

http://dx.doi.org/10.21577/0103-5053.20180059

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+.

http://dx.doi.org/10.21577/0103-5053.20180058

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.

http://dx.doi.org/10.21577/0103-5053.20180057

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.

http://dx.doi.org/10.21577/0103-5053.20180056

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.

http://dx.doi.org/10.21577/0103-5053.20180055

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.

http://dx.doi.org/10.21577/0103-5053.20180054

Published online: March 19, 2018.


J. Braz. Chem. Soc. 2018

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

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

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

http://dx.doi.org/10.21577/0103-5053.20180053

Published online: March 19, 2018.


J. Braz. Chem. Soc. 2018

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

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

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

http://dx.doi.org/10.21577/0103-5053.20180052

Published online: March 16, 2018.

J. Braz. Chem. Soc. 2018

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

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

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

http://dx.doi.org/10.21577/0103-5053.20180051

Published online: March 15, 2018.


J. Braz. Chem. Soc. 2018

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

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

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

http://dx.doi.org/10.21577/0103-5053.20180049

Published online: March 13, 2018.

J. Braz. Chem. Soc. 2018

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

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

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

http://dx.doi.org/10.21577/0103-5053.20180048

Published online: March 13, 2018.

J. Braz. Chem. Soc. 2018

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

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

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

http://dx.doi.org/10.21577/0103-5053.20180047

Published online: March 13, 2018.


J. Braz. Chem. Soc. 2018

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

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

Surface modified silica aerogel nanoparticles.

http://dx.doi.org/10.21577/0103-5053.20180046

Published online: March 13, 2018.

J. Braz. Chem. Soc. 2018

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

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

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

http://dx.doi.org/10.21577/0103-5053.20180045

Published online: March 9, 2018.


J. Braz. Chem. Soc. 2018

Fast Spectrophotometric Determination of Iodine Value in Biodiesel and Vegetable Oils

Samara Soares; Fábio R. P. Rocha

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

http://dx.doi.org/10.21577/0103-5053.20180044

Published online: March 9, 2018.

J. Braz. Chem. Soc. 2018

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

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

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

http://dx.doi.org/10.21577/0103-5053.20180043

Published online: March 8, 2018.

J. Braz. Chem. Soc. 2018

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

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

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

http://dx.doi.org/10.21577/0103-5053.20180042

Published online: March 8, 2018.

J. Braz. Chem. Soc. 2018

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

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

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

http://dx.doi.org/10.21577/0103-5053.20180040

Published online: March 7, 2018.

J. Braz. Chem. Soc. 2018

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

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

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

http://dx.doi.org/10.21577/0103-5053.20180039

Published online: March 7, 2018.


J. Braz. Chem. Soc. 2018

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

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

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

http://dx.doi.org/10.21577/0103-5053.20180038

Published online: March 6, 2018.


J. Braz. Chem. Soc. 2018

Analytical Method Development for Fatty Acid Direct Methylation in Fruits

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

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

http://dx.doi.org/10.21577/0103-5053.20180036

Published online: March 5, 2018.

J. Braz. Chem. Soc. 2018

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

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

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

http://dx.doi.org/10.21577/0103-5053.20180035

Published online: March 1, 2018.


J. Braz. Chem. Soc. 2018

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

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

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

http://dx.doi.org/10.21577/0103-5053.20180034

Published online: February 27, 2018.


J. Braz. Chem. Soc. 2018

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

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

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

http://dx.doi.org/10.21577/0103-5053.20180033

Published online: February 26, 2018.


J. Braz. Chem. Soc. 2018

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

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

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

http://dx.doi.org/10.21577/0103-5053.20180032

Published online: February 26, 2018.


J. Braz. Chem. Soc. 2018

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

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

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

http://dx.doi.org/10.21577/0103-5053.20180031

Published online: February 26, 2018.


J. Braz. Chem. Soc. 2018

A Water Soluble Naphthalimide-Based Chemosensor for Fluorescent Detection CN in Pure Water and Its Application in Practical Samples

Li Wang; Wen-Ting Li; Wen-Juan Qu; Yan-Qing Fan; Hong Yao; Qi Lin; Tai‑Bao Wei; You-Ming Zhang

A water soluble fluorescent chemosensor (DA) was successfully synthesized. It could fluorescent detect CN- with high selectivity and sensitivity in pure water via an intramolecular charge transfer to twisted intramolecular charge transfer (ICT-TICT) state change mechanism.

http://dx.doi.org/10.21577/0103-5053.20180030

Published online: February 23, 2018.


J. Braz. Chem. Soc. 2018

Multiple Spectroscopic and Theoretical Approaches to Study the Interaction between HSA and the Antiparasitic Drugs: Benznidazole, Metronidazole, Nifurtimox and Megazol

Otávio A. Chaves; Romulo C. Ferreira; Lorrayne S. da Silva; Bruna C. E. de Souza; Dari Cesarin-Sobrinho; José Carlos Netto-Ferreira; Carlos M. R. Sant'Anna; Aurélio B. B. Ferreira

Benznidazole (BZL), metronidazole (MTZ), nifurtimox (NFX) and megazol (MZ) can be carried in the human bloodstream by human serum albumin (HSA). NFX showed differences in the thermodynamic parameters; the presence of the 1,3,4-thiadiazole group in the MZ structure results in better interaction with HSA.

http://dx.doi.org/10.21577/0103-5053.20180029

Published online: February 20, 2018.


J. Braz. Chem. Soc. 2018

Development of a Method Based on DLLME and UFLC-DAD for the Determination of Antibiotics in Honey Samples and the Study of Their Degradation Kinetics

Ana C. B. A. Santana; Marta V. A. Santana; Pedro A. P. Pereira

In this work, a method was developed, based on dispersive liquid-liquid microextraction (DLLME)-ultra-fast liquid chromatography coupled to diode array detector (UFLC-DAD), to simultaneously determine ten antibiotics in honey and for studying their degradation kinetics.

http://dx.doi.org/10.21577/0103-5053.20180028

Published online: February 20, 2018.


J. Braz. Chem. Soc. 2018

ETS‑10 Modified with CuxO Nanoparticles and Their Application for the Conversion of CO2 and Water into Oxygenates

Eliane R. Januário; Ana F. Nogueira; Heloise O. Pastore

Solar fuels were obtained from CO2 and H2O photoreduction using ETS-10/CuxO as photocatalyst.

http://dx.doi.org/10.21577/0103-5053.20180026

Published online: February 20, 2018.


J. Braz. Chem. Soc. 2018

Effects of the Structure and Composition of Montmorillonite on the Dimerization of Unsaturated Fatty Acids

Xue Huang; Yaoqi Yin; Buning Zhang; Guangzhu Feng

After one-step and two-step intercalations, the structure and properties of montmorillonite (MMT) affect the formation of dimer acids by the dimerization of unsaturated fatty acids.

http://dx.doi.org/10.21577/0103-5053.20180025

Published online: February 16, 2018.

J. Braz. Chem. Soc. 2018

Using Bar Infrared Spectra and Coincidence Indexes to Study the Diversity of Solid Cyanuric Acid Structures

Marcela C. B. G. Nilo; Thais G. Simões; Claudio Costa Neto

Bar spectra and coincidence indexes establish new horizons for the infrared spectroscopy of solids. Polymorphs are precisely detected and quantified. This method may become an important tool for studying polymorphs in active pharmaceutical ingredients (APIs).

http://dx.doi.org/10.21577/0103-5053.20180023

Published online: February 14, 2018.


J. Braz. Chem. Soc. 2018

Selective Adsorption of AuIII from Aqueous Solution Using 2,5‑Dimercapto‑1,3,4‑thiadiazole Modified Persimmon Tannin

Sijing Zhang; Yongliang Ji; Fengjiao Ao; Yongping Wang; Junxue Zhao; Shuangli Chen

DMTD-PT, a persimmon tannin (PT)-based and 2,5-dimercapto-1,3,4-thiadiazole (DMTD) grafted biosorbent, showed the better selectivity for AuIII over coexisting base metal ions in aqueous solution.

http://dx.doi.org/10.21577/0103-5053.20180022

Published online: February 14, 2018.


J. Braz. Chem. Soc. 2018

Automatic Identification of Cigarette Brand Using Near-Infrared Spectroscopy and Sparse Representation Classification Algorithm

Yang Shuangyan; Hou Ying; Yang Lingchun; Zhang Jianqiang; Liu Weijuan; Qiu Changgui; Li Ming; Yang Yanmei

The combination of near-infrared (NIR) spectroscopy and deep learning algorithm is a promising classification tool of discriminating different categories of objects.

http://dx.doi.org/10.21577/0103-5053.20180019

Published online: February 8, 2018.

J. Braz. Chem. Soc. 2018

Evaluation of the Sustainability of Integrated Hydrothermal Synthesis of Zeolites Obtained from Waste

Suzana F. Ferrarini; Ariela M. Cardoso; Luisa Alban; Marçal J. R. Pires

Comparison between the two processes via: (i) assessment of the process of Si, Al and contaminants in the extracts, zeolitic, products and effluents, (ii) cation exchange capacity and purity, and (iii) reaction yields and percentage of Si and Al incorporated into zeolites, among others.

http://dx.doi.org/10.21577/0103-5053.20180017

Published online: February 6, 2018.


J. Braz. Chem. Soc. 2018

Study on the Mixed-Mode HPLC Separation of Shuang-Huang-Lian and Xue‑Bi‑Jing Injections Based on an Ionic Liquid Column

Aihong Yang; Shun Zhang; Lei Zhang; Jingjing Zhong; Xiaodi Kou

Traditional Chinese medicine injections were analyzed based on an ionic liquid column. U-Shape plots of retention factors vs. mobile phase constitutions were obtained and mixed-mode chromatography was applied for this kind of complex system.

http://dx.doi.org/10.21577/0103-5053.20180012

Published online: January 26, 2018.


J. Braz. Chem. Soc. 2018

Design of Novel N-Miristoiltransferase Inhibitors of Leishmania donovani Using Four-Dimensional Quantitative Structure-Activity Relationship Analysis

Letícia Santos-Garcia; Daniela R. Silva; Letícia C. Assis; Tamiris M. de Assis; Giovanna C. Gajo; Ítalo Antônio Fernandes; Teodorico C. Ramalho; Elaine F. F. da Cunha

Proposed N-myristoyltransferase (NMT) inhibitors of Leishmania donovani anchored in the active site of the enzyme.

http://dx.doi.org/10.21577/0103-5053.20180007

Published online: January 15, 2018.


J. Braz. Chem. Soc. 2018

Polydimethylsiloxane as a Matrix for the Stabilization and Immobilization of Zero‑Valent Iron Nanoparticles. Applications to Dehalogenation of Environmentally Deleterious Molecules

Donaldo Fabio Mercado; Richard G. Weiss

Introduction of zero-valent iron nanoparticles into amino-polydimethylsiloxane based materials allows easy recovery of the particles while maintaining their reactivity toward the dehalogenation of environmental pollutants.

http://dx.doi.org/10.21577/0103-5053.20180006

Published online: January 15, 2018.


Short Report J. Braz. Chem. Soc. 2018

Applying Different Sample Treatment Strategies for Evaluating Phosphorus Distribution in Orange Juice

Maria F. C. da Silva Neta; Ana C. F. de Lyra; Sarah A. R. Soares; Josué C. C. Santos; Daniela S. Anunciação

Estimation of phosphorus distribution in orange juice by different sample treatment strategies including fractioning in function of its particle size and charge.

http://dx.doi.org/10.21577/0103-5053.20180005

Published online: January 12, 2018.

Articles J. Braz. Chem. Soc. 2018

Adsorptive Stripping Voltammetric Determination of Oxolinic Acid in Water Sample

Herbert Aleixo; Leonardo L. Okumura; Astréa F. S. Silva; Alexandre Gurgel; Juliana A. Diniz

A new method for analysis of the antimicrobial oxolinic acid (OXA) in untreated water was developed using carbon paste electrode.

http://dx.doi.org/10.21577/0103-5053.20180004

Published online: January 12, 2018.

J. Braz. Chem. Soc. 2018

Transition from Thermokinetic to Chemical Instabilities in a Modified Sal'nikov Model

Daniel Barragán; Pablo A. Ochoa-Botache

Transition between chemical and thermokinetic oscillations mediated by a stoichiometric bifurcation parameter in a hypothetical biological context: muscle fatigue and possible ATP thermosynthesis.

http://dx.doi.org/10.21577/0103-5053.20180003

Published online: January 11, 2018.


J. Braz. Chem. Soc. 2018

A Multicommuted Flow System for Spectrophotometric Determination of Formaldehyde in Mushroom

Gabriel F. Pinto; Diogo L. Rocha; Eduardo M. Richter; Rodrigo A. A. Muñoz; Sidnei G. da Silva

A multicommuted flow system for spectrophotometric determination of formaldehyde in mushroom based on the Hantzsch reaction (λmax = 412 nm) is reported with a detection limit of 0.02 mg L-1, sample throughput of 17 h-1 and reduced chemical waste.

http://dx.doi.org/10.21577/0103-5053.20180002

Published online: January 8, 2018.

Short Report J. Braz. Chem. Soc. 2018

Mercury Biodistribution in Rats after Chronic Exposure to Mercury Chloride

Mariana Z. G. Fornazier; Tatiani B. Nascimento; Vinicius B. Marques; Tatiana D. Saint'Pierre; Dalton Vassalo; Geisamanda P. Brandão; Leonardo dos Santos; Maria T. W. D. Carneiro

In this work we evaluated the mercury biodistribution after different doses of HgCl2. Mercury was deposited preferentially in some tissues while the blood levels remained practically constant. Therefore, it is suggested that blood mercury monitoring is relevant only when the tissues turn saturated.

http://dx.doi.org/10.21577/0103-5053.20180001

Published online: January 5, 2018.

Articles J. Braz. Chem. Soc. 2017

Synthesis, DNA Interaction and Genotoxic Evaluation of a Photoactive Benzothiadiazole with Potential Application in Photovoltaic Paint

Adriani P. Damiani; Paula Rohr; José L. Westrup; Rodrigo C. Duarte; Luiza M. Longaretti; Bruna M. da Rocha; Giulia Strapazzon; Lara C. Venturini; Emanuel Souza; Claus T. Pich; Tiago E. A. Frizon; Vanessa M. de Andrade; Fabiano S. Rodembusch; Alexandre G. Dal-Bó

The 2,1,3-benzothiadiazole compound can be used safely in manufacturing as a dye for paints and photovoltaic devices.

http://dx.doi.org/10.21577/0103-5053.20170241

Published online: December 21, 2017.

J. Braz. Chem. Soc. 2017

Rapid and Efficient Uncatalyzed Knoevenagel Condensations from Binary Mixture of Ethanol and Water

João M. G. O. Ferreira; João B. M. de Resende Filho; Poliane K. Batista; Ercules E. S. Teotonio; Juliana A. Vale

The uncatalyzed Knoevenagel condensation between aldehydes and different compounds with active methylene was performed under new conditions using a mixture of ethanol/water (3:7, v/v), showing a good isolated yields in a short reaction time.

http://dx.doi.org/10.21577/0103-5053.20170240

Published online: December 21, 2017.


J. Braz. Chem. Soc. 2017

Carbon Nanotube-Supported Copper-Cobalt Catalyst for the Production of Higher Carbon Number Alcohols through Carbon Monoxide Hydrogenation

Peng Wang; Xihua Du; Wenchang Zhuang; Keying Cai; Jing Li; Yan Xu; Yingmei Zhou; Kai Sun; Shuyao Chen; Xiaoli Li; Yisheng Tan

Copper promotes the reduction of CoO and forms Cu0–Co0 active sites; in addition to this center, Co0–Co2+ is also the center for high alcohols synthesis and Co2+ site favor alcohols yields. Excellent C2+ alcohols selectivity is got over the catalyst with weight ratio of Cu/Co = 1.

http://dx.doi.org/10.21577/0103-5053.20170237

Published online: December 20, 2017.


J. Braz. Chem. Soc. 2017

Prediction of Sulfur Content in Diesel/Biodiesel Blends Using LED-Induced Fluorescence Associated with Multivariate Calibration

Alessandra T. Campos; Cristina M. Quintella; Marilena Meira; Saionara Luna

Light emitting diode (LED)-induced fluorescence equipment was used in the biodiesel/diesel/sulfur sample readings and after the analysis the data treatment was done using partial least squares (PLS).

http://dx.doi.org/10.21577/0103-5053.20170236

Published online: December 19, 2017.

Online version ISSN 1678-4790 Printed version ISSN 0103-5053
Journal of the Brazilian Chemical Society
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