7:21, Mon Nov 20

Open Access/APCs

Forthcoming Papers - 2017

Articles published online ahead of print

Articles J. Braz. Chem. Soc. 2017

A New, Friendlier Methodology to Determine the Average Manganese Valence in LixMn2O4 Spinels Using Atomic Absorption Spectrometry and Molecular Absorption Spectrophotometry

João P. Silva; Ricardo M. Silva; Sonia R. Biaggio; Nerilso Bocchi; Romeu C. Rocha-Filho

Precise average manganese valences (ν) for Mn oxides are attained spectroscopically. When the oxides react with Fe2+, Mnν+ is reduced to Mn2+; thence [Mn2+] is determined by AAS and excess [Fe2+] by MAS (after Fe2+ complexation with o-phenanthroline), enabling the determination of ν.


Published online: November 17, 2017.

J. Braz. Chem. Soc. 2017

Interlaboratory Comparison for the Characterization of a Brazilian Mussel Reference Material

Edson G. Moreira; Marina B. A. Vasconcellos; Vera A. Maihara; Marília G. M. Catharino; Mitiko Saiki

Production of a mussel reference material: from the living organism to certified mass fractions in bottles.


Published online: November 17, 2017.

J. Braz. Chem. Soc. 2017

Antimicrobial Activity of 3,4-seco-Diterpenes Isolated from Croton blanchetianus against Streptococcus mutans and Streptococcus parasanguinis

Nairley C. S. Firmino; Francisco S. O. Alexandre; Mayron A. de Vasconcelos; Alison J. S. Conrado; Francisco V. S. Arruda; Edilberto R. Silveira; Edson H. Teixeira

Three antibacterial 3,4-seco-diterpenes were isolated from hexane extracts of roots of individual specimens of Croton blanchetianus Baill.


Published online: November 17, 2017.

J. Braz. Chem. Soc. 2017

Development and Validation of Liquid Chromatography-Tandem Mass Spectrometry Methods for Determination of Beta-Lactams, Macrolides, Fluoroquinolones, Sulfonamides and Tetracyclines in Surface and Drinking Water from Rio de Janeiro, Brazil

Mychelle A. Monteiro; Bernardete F. Spisso; Rosana G. Ferreira; Mararlene U. Pereira; Jônatas V. Grutes; Bárbara R. G. de Andrade; Luiz A. d'Avila

Antibiotics in the aquatic environment are present at low level. This method was applied for quantification of 46 analytes. The validation tests showed good performance for the surface and drinking water. The method was applied to evaluate these compounds in samples from Rio de Janeiro.


Published online: November 17, 2017.

J. Braz. Chem. Soc. 2017

A Convenient and Efficient Method for the Synthesis of a Novel Series of N‑Butyl‑1,4-oxazino[2',3':4,5]pyrano[3,2-c]quinolinones

Hany M. Hassanin; Mohamed M. Hassan

Starting from 3-amino and/or 3-nitro-4-hydroxypyranoquinolindione, some novel 1,4-oxazinopyranoquinolinone derivatives have been synthesized.


Published online: November 14, 2017.

J. Braz. Chem. Soc. 2017

Factorial Design Applied for Evaluation of Effect of Interactions among Precursors on the Thermal Decomposition Temperature of Montmorillonite/Poly(Methyl Methacrylate) Nanocomposites

Joseane A. Santana; Rennan G. O. Araujo; Filipe A. de Jesus; Kelly S. Lima; Giovanna Machado; Maria C. P. Cruz; Victor H. V. Sarmento

A full factorial design was utilized to synthesize and to statistically study thermal properties of montmorillonite/poly(methyl methacrylate) nanocomposites.


Published online: November 13, 2017.

J. Braz. Chem. Soc. 2017

Targeted-Analysis of β-Carboline Alkaloids in Passionfruit ("Maracujá") by SBSE(PDMS)-LC/Flu and UHPLC-MS

Vítor F. Freire; Gabriela R. Silva; Janete H. Yariwake

β-Carboline alkaloids were identified in passionfruit by using UHPLC-MS (ultrahigh performance liquid chromatography-mass spectrometry) and SBSE(PDMS) (stir bar sorption extraction using polydimethylsiloxane as stationary phase) techniques.


Published online: November 10, 2017.

J. Braz. Chem. Soc. 2017

Antimicrobial Activity of Paepalanthus planifolius and its Major Components against Selected Human Pathogens

Marcelo R. de Amorim; Felipe Hilário; Paulo T. Sano; Tais M. Bauab; Lourdes C. dos Santos

New naphthopyranone dimer named planifoliusin A isolated from Paepalanthus planifolius.


Published online: November 10, 2017.

J. Braz. Chem. Soc. 2017

Magnetic Solid-Phase Extraction Combined with Dispersive Liquid-Liquid Microextraction Followed by HPLC for Determination of Four Aromatic Amines Released from Azo Dyes in Paper Samples

Xiaolan Li; Dongling Meng; Ruiqi Liu; Yaling Yang

As shown in the figure, n-octanol, which was used as the extractant, and hydrophobic oleic acid modified Fe3O4 nanoparticles (Fe3O4@OA NPs), as an efficient adsorbent, were applied to retrieve the primary aromatic amines (PAAs)-containing n-octanol in the dispersive liquid-liquid microextraction (DLLME) step.


Published online: November 9, 2017.

J. Braz. Chem. Soc. 2017

Microemulsion as Sample Preparation for Direct Flame Atomic Absorption Spectrometry (FAAS) Determination of Total Iron in Crude and Refined Vegetable Oils

Marília B. Galuch; Angélica F. B. Piccioli; Eduardo Sobieski Neto; Natália Fier; Nayara C. Saldan; Edivaldo E. Garcia

A fast and simple analytical method was firstly proposed for the determination of iron (Fe) in crude and refined vegetable oil samples by employing the conventional flame atomic absorption spectrometry (FAAS) technique and microemulsification as sample preparation procedure.


Published online: November 3, 2017.

J. Braz. Chem. Soc. 2017

Two Novel Donepezil-Lipoic Acid Hybrids: Synthesis, Anticholinesterase and Antioxidant Activities and Theoretical Studies

Bruna S. Terra; Pedro H. C. da Silva; Anna Tramarin; Lucas L. Franco; Elaine F. F. da Cunha; Fernando Macedo Junior; Teodorico C. Ramalho; Manuela Bartolini; Maria L. Bolognesi; Ângelo de Fátima

Two hybrids containing the indanone-piperidine moiety of donepezil and lipoic acid scaffolds were synthesized. One hybrid displayed moderate inhibitory activity against hAChE and greater activity against hBuChE. It also showed a good antioxidant activity, exhibiting better ability in scavenging 2,2-diphenyl-1 picrylhydrazyl (DPPH) radicals than lipoic acid.


Published online: October 31, 2017.

J. Braz. Chem. Soc. 2017

Development and Validation of a Rapid and Reliable RP-HPLC-PDA Method for the Quantification of Six Diterpenes in Copaifera duckei, Copaifera reticulata and Copaifera multijuga Oleoresins

Luiza J. Carneiro; Thamires C. Bianchi; Jonas J. M. da Silva; Larissa C. Oliveira; Carly H. G. Borges; Danieli C. Lemes; Jairo K. Bastos; Rodrigo C. S. Veneziani; Sérgio R. Ambrósio

Development and validation of a rapid and reliable reversed-phase high-performance liquid chromatography with photodiode array detection (RP-HPLC-PDA) method for quantifying six diterpenes in three species of Brazilian Copaifera oleoresins: C. duckei, C. reticulata and C. multijuga.


Published online: October 27, 2017.

Additions and Corrections J. Braz. Chem. Soc. 2017

Nano-Detoxification of Organophosphate Agents by PAMAM Derivatives

Esteban F. Durán-Lara; Fabian Ávila-Salas; Sebastian Galaz; Amalraj John; Adolfo Maricán; Margarita Gutiérrez; Fabiane M. Nachtigall; Fernando D. Gonzalez-Nilo; Leonardo S. Santos


Published online: October 26, 2017.

Short Report J. Braz. Chem. Soc. 2017

Solid Phase Microextraction (SPME) Fibers: in situ Measurements of Endocrine Disrupting Chemicals in Seawater

Dayana M. Santos; Mike Williams; Rai Kookana; Mary R. R. de Marchi

Solid phase microextraction (SPME) fibers for use as passive sampler of endocrine disrupting chemicals as triclosan, bisphenol A and 17α-ethinylestradiol in seawater.


Published online: October 25, 2017.

Articles J. Braz. Chem. Soc. 2017

Design, Synthesis, Biological Evaluation and Molecular Modeling Studies of Novel Eugenol Esters as Leishmanicidal Agents

Camila M. Coelho; Thiago dos Santos; Poliany G. Freitas; Juliana B. Nunes; Marcos J. Marques; Camila G. D. Padovani; Wagner A. S. Júdice; Ihosvany Camps; Nelson J. F. da Silveira; Diogo T. Carvalho; Marcia P. Veloso

Synthesis of novel eugenol esters designed to inhibit the Leishmania rCPB 2.8 enzyme and in vitro evaluation of their biological activity. The molecular modeling study investigated the possible mechanisms of activation and inhibition exerted by some of these compounds on the enzyme rCPB 2.8.


Published online: October 25, 2017.

J. Braz. Chem. Soc. 2017

HR-MAS NMR Allied to Chemometric on Hancornia speciosa Varieties Differentiation

Igor S. Flores; Andressa K. Silva; Leonnardo C. Furquim; Carlos F. S. Castro; Lazaro J. Chaves; Rosane G. Collevatti; Luciano M. Lião

Chemometric analyses of 1H high-resolution magic angle spinning nuclear magnetic resonance (1H HR-MAS NMR) data for the chemotaxonomic investigation of Hancornia speciosa (mangaba) varieties.


Published online: October 25, 2017.

J. Braz. Chem. Soc. 2017

Synthesis and Antibacterial Evaluation of 2-Ethyl-1-(4-substituted)phenyl-1H-imidazole Derivatives as Open-Chain Analogues of 7-Alkoxyl-4,5-dihydroimidazo[1,2-α]quinolines

Xian-Yu Sun; Mei-Yu Liu; Chun-Yan Zhong; Gui-Lin Zheng; Ming-Yue Lv; Bo-Tao Jing; Chun-Yuan Pan; Xin Wang

An outstanding compound was found to possess slightly more potent antibacterial activity against several bacterial strains than the reference drugs.


Published online: October 19, 2017.

Short Report J. Braz. Chem. Soc. 2017

Absolute Configuration of Clemateol

Marcelo Pedroso; Adriana Z. Gehn; Mateus L. Stivanin; Enrique L. Larghi; Robert A. Burrow; Jackson A. L. C. Resende; Ubiratan F. da Silva; Marco A. Mostardeiro; Ionara I. Dalcol; Ademir F. Morel

The absolute stereochemistry of clemateol was established on the basis of detailed NMR spectroscopic evidence (3JH-H analysis, derivatization as Mosher's esters and NOESY) and also by resonance scattering effects in the single crystal X-ray diffraction experiment of its (R)-mandelic acid ester derivative.


Published online: October 17, 2017.

Articles J. Braz. Chem. Soc. 2017

A New Method for the Determination of Creatinine in Urine Samples Based on Disposable Pipette Extraction

Aline R. Fernandes; Paulo S. de Souza; Anselmo E. de Oliveira; Andréa R. Chaves

A simple, sensitive and reliable DPX/LC-UV (disposable pipette extraction using liquid chromatography with ultraviolet detection) method for the rapid determination of creatinine levels in urine samples.


Published online: October 17, 2017.

J. Braz. Chem. Soc. 2017

Electrocatalytic Oxidation Removal of Phenol from Aqueous Solution with Metal Oxides Doped Carbon Aerogel

Gui-Fen Lv; Yuan-Hua Chen; Tao Yang and Jian-Guo Li

For metal oxides doped carbon aerogel (CA), the n-type and p-type semiconductors exhibited different electrocatalytic effect for phenol removal, and the former has higher effect.


Published online: October 13, 2017.

Short Report J. Braz. Chem. Soc. 2017

Comparison between Ultrasound Assisted Extraction and Microwave Digestion in the Determination of Arsenic in Edible Grains

Roberto V. Ribeiro; Júlia C. Vieira; Fabiana A. Lobo; Roberta E. S. Froes-Silva

Comparison between microwave digestion and ultrasound assisted extraction (UAE) was made. UAE presents better performance compared to microwave digestion in arsenic extraction. Accuracy performance was close to 100% for all three methods developed. Bean samples cultivated in impacted areas presented 0.3 µg g-1 of arsenic concentration.


Published online: October 13, 2017.

Articles J. Braz. Chem. Soc. 2017

Qualitative and Quantitative Chemical Investigation of Orthopedic Alloys by Combining Wet Digestion, Spectroanalytical Methods and Direct Solid Analysis

Caio M. Figueiredo; Jeyne P. Castro; Marco A. Sperança; Lucimar L. Fialho; Joaquim A. Nóbrega; Edenir R. Pereira-Filho

Laser-based analytical techniques for direct qualitative evaluation of orthopedic Ti alloys, and results comparison with data obtained after microwave-assisted digestion and inductively coupled plasma optical emission (ICP OES) determination.


Published online: October 10, 2017.

J. Braz. Chem. Soc. 2017

Development of a Novel and Simple Electroanalytical Procedure for the Determination of Copper in Biofuel Employing a Sensor Based on Vulcan Functionalized with Carbazone

Tayane A. Freitas; Manoel J. A. Lima; Aldaléa L. B. Marques; Edmar P. Marques; Rita C. S. Luz; Cicero W. B. Bezerra

Carbon paste electrode modified with Vulcan-carbazone presenting electroanalytical response for Cu2+ ions.


Published online: October 10, 2017.

J. Braz. Chem. Soc. 2017

In-House Validation of HPLC-MS/MS Methods for Detection and Quantification of Tetracyclines in Edible Tissues and Feathers of Broiler Chickens

Ekaterina V. Pokrant; Aldo E. Maddaleno; Carolina E. Araya; Betty V. San Martín; Javiera Cornejo

An in-house validation of methods was used for determination of tetracyclines in chicken feather, muscle and liver tissues, through high-performance liquid chromatography coupled with tandem mass spectrometry (HPLC MS/MS).


Published online: October 10, 2017.

J. Braz. Chem. Soc. 2017

Novel Chemical Route for Deposition of Cu2ZnSnS4 Photovoltaic Absorbers

Gerardo Gordillo; Raul A. Becerra; Clara L. Calderón

Solar cells with efficiencies of 4.9% were fabricated using a Cu2ZnSnS4 absorber layer synthesized following a novel chemical route based on the membrane assisted chemical bath deposition (CBD) technique.


Published online: October 9, 2017.

J. Braz. Chem. Soc. 2017

Synthesis, Antibacterial and Antitubercular Evaluation of Cardanol and Glycerol‑Based β-Amino Alcohol Derivatives

Bhaskar R. Manda; Avvari N. Prasad; Narendar R. Thatikonda; Valdemar Lacerda Jr.; Layla R. Barbosa; Heloa Santos; Wanderson Romão; Fernando R. Pavan; Camila M. Ribeiro; Edson A. dos Santos; Maria R. Marques; Dênis P. de Lima; Ana C. Micheletti; Adilson Beatriz

Herein we provide a simple and efficient approach for the synthesis of amino alcohols by using cardanol and glycerol building blocks with amines under catalyst-free and mild conditions. Some of these synthesized compounds exhibited significant antimicrobial activity against S. aureus and M. tuberculosis.


Published online: October 6, 2017.

J. Braz. Chem. Soc. 2017

Quality Assessment of Omega-3 Supplements Available in the Brazilian Market

Marília B. Galuch; Fabiana Carbonera; Thiago F. S. Magon; Roberta da Silveira; Patrícia D. S. dos Santos; Jessica S. Pizzo; Oscar O. Santos; Jesuí V. Visentainer

Fish oil omega-3 supplements are eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) sources. However, fish oil is expensive raw material and its adulteration is common, especially with addition of edible oils with low cost, such as soybean oil. This study estimated the Brazilian reality regarding those supplements.


Published online: October 5, 2017.

J. Braz. Chem. Soc. 2017

Antifungal Polyketides and Other Compounds from Amazonian Endophytic Talaromyces Fungi

Paulo H. F. da Silva; Mayane P. de Souza; Eliana A. Bianco; Sarah R. S. da Silva; Liviane N. Soares; Emmanoel V. Costa; Felipe M. A. da Silva; Andersson Barison; Moacir R. Forim; Quezia B. Cass; Afonso D. L. de Souza; Hector H. F. Koolen; Antonia Q. L. de Souza

Talaromyces fungi were isolated from Amazonian plants. From the antimicrobial extracts, 13 compounds were isolated and fully characterized by spectroscopic methods. Among the isolated compounds, polyketides, maleic anhydrides, and steroids were obtained, including two new compounds. The antifungal evaluation of the isolated compounds is described herein.


Published online: October 4, 2017.

J. Braz. Chem. Soc. 2017

Evaluation of Oxidative Stress in Patients with Acute Lymphoblastic Leukemia: Experimental Evidence of the Efficacy of MDA as Cancer Biomarker in Young Patients

Mariana B. Almeida; Emanuel Carrilho; Suzana L. Nixdorf

Malondialdehyde (MDA) efficacy as a cancer biomarker in acute lymphoid leukemia (ALL) that affects young patients was experimentally evidenced. Biochemical parameter charts associating with MDA contents, determined by high performance liquid chromatography, applying chemometric tools, allowed correlating risk stratification and assist in the disease diagnosis.


Published online: September 29, 2017.

J. Braz. Chem. Soc. 2017

N-Acetyl-cysteine Increases Chemical Stability of Hydroquinone in Pharmaceutical Formulations: a Theoretical and Experimental Approach

Rosivaldo S. Borges; Fernanda M. Costa; Tiago L. Pereira; Renata L. Araújo; Eduardo D. Almeida; Albérico B. F. da Silva

Chemical stability of hydroquinone (a) is compared to kojic (b). The hydroquinone was the most reactive. Its oxidation was inhibited more by N-acetylcysteine (d) than ascorbic acid (c).


Published online: September 29, 2017.

J. Braz. Chem. Soc. 2017

Determination of Six Synthetic Dyes in Sports Drinks by Dispersive Solid-Phase Extraction and HPLC-UV-Vis

Luana Floriano; Lucila C. Ribeiro; Nathália Saibt; Nelson M. G. Bandeira; Osmar D. Prestes; Renato Zanella

Simple and fast dispersive solid-phase extraction (d-SPE) method combined with syringe/filter to perform dyes analysis by high-performance liquid chromatography with ultraviolet-visible (HPLC-UV-Vis).


Published online: September 26, 2017.

J. Braz. Chem. Soc. 2017

Effect of Dy3+ Amount on the Structural and Luminescence Properties of LaNbO4:Dy3+ Phosphor Obtained by One-Step Spray Pyrolysis Process

Gabriela S. Freiria; Amanda L. Ribeiro; Marc Verelst; Eduardo J. Nassar; Lucas A. Rocha

Blue-white tunable emission color in (Dy3+)-LaNbO4 spherical particles synthesized by one-step spray pyrolysis process. The obtained CIE chromaticity coordinates fit the National Television Standard Committee (NTSC) standard values.


Published online: September 25, 2017.

J. Braz. Chem. Soc. 2017

Screening and Binding Analysis of Flavonoids with Alpha-Amylase Inhibitory Activity from Lotus Leaf

Liping Liao; Jing Chen; Liangliang Liu; Aiping Xiao

Centrifugal ultrafiltration combined with liquid chromatography was used to screen alpha-amylase inhibitors from ten flavonoids mixture and the binding degrees ranged from 2.34 to 94.1%.


Published online: September 25, 2017.

J. Braz. Chem. Soc. 2017

Ultrasound-Assisted Saponification Coupled with Gas Chromatography-Flame Ionization Detection for the Determination of Phytosterols from Passion Fruit Seed Oil

Eliza M. Rotta; Michele C. da Silva; Liane Maldaner; Jesuí V. Visentainer

A method based on ultrasound-assisted saponification (UAS) was proposed to determine phytosterols in passion fruit seed oil. The optimized UAS method extracted higher phytosterol concentrations and was about 3.3 times faster than the conventional saponification method.


Published online: September 25, 2017.

J. Braz. Chem. Soc. 2017

Determination of Chlorine in Crude Oil Emulsified via the MgCl Molecule by HR‑CS MAS

Izabel K. S. Oliveira; Rina L. S. Medeiros; Djalma R. Silva; Tatiane A. Maranhão

Chlorine present in crude oil is an important cause of problems related to corrosion and damage to equipment. This paper describes the development of a method for chlorine determination in crude oil samples through MgCl diatomic molecule by high-resolution continuum source molecular absorption spectrometry (HR-CS MAS).


Published online: September 22, 2017.

J. Braz. Chem. Soc. 2017

Development of a Novel Mixed Titanium, Silver Oxide Polyacrylonitrile Nanofiber as a Superior Adsorbent and its Application for MB Removal in Wastewater Treatment

Zhiqun Xu; Congcong Wei; Jiali Jin; Wenkai Xu; Qiao Wu; Junjie Gu; Minrui Ou; Xiaoping Xu

Development of a novel mixed titanium, silver oxide nanofiber as a superior adsorbent for dyes removal in the wastewater treatment.


Published online: September 22, 2017.

J. Braz. Chem. Soc. 2017

Photoluminescence of Solvent-Selected Fluorescent Moieties in MEH-PPV Solutions and Films

Antonio C. C. Ribeiro; Henrique S. Camargo; Douglas H. Pereira; Rogério Custódio; Tatiana D. Martins

The photophysical behavior of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) is morphology-dependent in both solution and film form: the preparation method influences the exciton distribution.


Published online: September 21, 2017.

J. Braz. Chem. Soc. 2017

Simultaneous Determination of Kaempferide, Kaempferol and Isorhamnetin in Rat Plasma by Ultra-High Performance Liquid Chromatography-Tandem Mass Spectrometry and its Application to a Pharmacokinetic Study

Zhitao Jiang; Jianchun Wang; Xiaofeng Chen; Xue Wang; Tongfang Wang; Zhitao Zhua; Jinhuo Pan

The mean plasma concentration-time curves after an oral administration of Sedum sarmentosum Bunge extract are shown. The data conformed to a two-compartment, first-order pharmacokinetic model.


Published online: September 18, 2017.

J. Braz. Chem. Soc. 2017

A Novel Sensitive Bulk Optode Based on 5-Br Salophen as an Ionophore for Determination of Zinc Ion in Real Samples

Elham Alian; Abolfazl Semnani; Alireza Firooz; Mahboube Shirani

The decrease of the concentration of 5-Br salophen in presence of Zn2+ in organic phase leads to an optical sensor, in which the mechanism is described by ion-exchange.


Published online: September 15, 2017.

J. Braz. Chem. Soc. 2017

An in silico Study of Benzophenone Derivatives as Potential Non-Competitive Inhibitors of Trypanosoma cruzi and Leishmania Amazonensis Cysteine Proteinases

Poliany G. Freitas; Thiago E. Castilho; Leticia de Almeida; Claudia M. Maciel-Rezende; Luciano T. Costa; Claudio Viegas Junior; Marcos J. Marques; Marcelo H. dos Santos; Nelson J. F. da Silveira

The mechanism of interaction between benzophenone derivatives and cruzain and Llacys1 (the protein expressed by cysteine protease gene isoform 1 of L. amazonensis) by homology modelling, docking and molecular dynamics simulation.


Published online: September 14, 2017.

J. Braz. Chem. Soc. 2017

Antimicrobial Diterpene from the Brazilian Termite Nasutitermes macrocephalus (Isoptera: Termitidae: Natutitermitinae)

Márcia N. S. de la Cruz; Helvécio M. dos Santos Júnior; Denilson F. Oliveira; Claudia M. Rezende

A new trinervitane diterpene isolated from termite soldiers (Nasutitermes macrocephalus) presented antimicrobial activities against S. aureus and C. albicans.


Published online: September 14, 2017.

J. Braz. Chem. Soc. 2017

Fine and Coarse Aerosol at Rio de Janeiro prior to the Olympic Games: Chemical Composition and Source Apportionment

Maria Luíza D. P. Godoy; Ana C. Almeida; Gisele B. Tonietto; José Marcus Godoy

Aerosol sampler installed at Tijuca sampling station, showing both EPA design PM10 inlets, one for elemental analysis (left) and the other for carbon determination (right).


Published online: September 13, 2017.

J. Braz. Chem. Soc. 2017

The Dichromate Method versus the Photoelectrochemical Method: the Synergistic Influence of Turbidity and Chlorides on Chemical Oxygen Demand Analysis

Gabriel O. Quintana; Enelton Fagnani; Fernando P. Candello; José R. Guimarães

The combined effect of turbidity and chlorides on chemical oxygen demand have not been explored before this study and must be considered when the acid dichromate method is replaced by photoelectrochemical method.


Published online: September 11, 2017.

J. Braz. Chem. Soc. 2017

Simultaneous Determination of Different Phenolic Compounds Using Electrochemical Biosensor and Multivariate Calibration

Renata K. Mendes; Marcos V. C. Dantas; Alessandra B. Nogueira; Augusto Etchegaray; Paulo R. Filgueiras; Ronei J. Poppi

A biosensor based on tyrosinase immobilized onto iron magnetic nanoparticles was successfully used for the simultaneous determination of two phenolic compounds after data analysis and chemometric treatment.


Published online: September 11, 2017.

J. Braz. Chem. Soc. 2017

Principal Component Analysis with Linear and Quadratic Discriminant Analysis for Identification of Cancer Samples Based on Mass Spectrometry

Camilo L. M. Morais; Kássio M. G. Lima

Principal component analysis with linear discriminant analysis (PCA-LDA) and quadratic discriminant analysis (PCA-QDA) were applied for discrimination between healthy control and cancer samples (ovarian and prostate cancer) based on mass spectra data sets.


Published online: September 5, 2017.

J. Braz. Chem. Soc. 2017

Effects of a Diet Supplemented with Japanese Grape (Hovenia dulcis) Seed Oil on the Omega-3 and Nutritional Lipid Quality in Nile Tilapia (Oreochromis niloticus)

Marina Oliveira; Ricardo P. Ribeiro; Michele C. da Silva; Paula F. Montanher; Fabiana Carbonera; Jesuí V. Visentainer; Liane Maldaner

Japanese grape seed oil (JGSO) is rich in alpha-linolenic acid (LNA) and was used to prepare supplemented diets for Nile tilapia. The replacement of soybean oil with JGSO in the prepared diets raises the nutritional lipid quality of the freshwater fish.


Published online: September 5, 2017.

J. Braz. Chem. Soc. 2017

A Novel Nanofibrous Film Chemosensor for Detecting and Adsorbing Fe3+

Chen Zhou; Yinan Zhang; Heng Liu

Recognition of the nanofibrous film chemosensor for Fe3+ by decrease of fluorescence.


Published online: September 1, 2017.

J. Braz. Chem. Soc. 2017

Enantiomeric Ratio Changes of Terpenes in Essential Oils from Hybrid Eucalyptus grandis × E. tereticornis and its Pure Species

Cecilia Naspi; Agustín A. Costa; Alejandro Lucia; Paola G. Audino; Hector M. Masuh

Fractionation of essential oils from Eucalyptus grandis × E. tereticornis, and its parental taxa, by HPLC followed by GC-MS analysis using two columns in series, allowed to determinate the enantiomeric excesses of selected monoterpenes. Significant differences were found in the enantiomeric ratios in monoterpene alcohols between the three essential oils.


Published online: August 31, 2017.

J. Braz. Chem. Soc. 2017

Catalytic Behaviors of CoII and MnII Compounds Bearing α-Diimine Ligands for Oxidative Polymerization or Drying Oils

Gilvan E. S. Lima; Everton V. Nunes; Roberta C. Dantas; Carlos A. de Simone; Mario R. Meneghetti; Simoni M. P. Meneghetti

Metal carboxylate complex modified with nitrogen ligands used as catalyst to oxidative polymerization of drying oils.


Published online: August 29, 2017.

J. Braz. Chem. Soc. 2017

Thermal Properties and Kinetics of Al/α-MnO2 Nanostructure Thermite

Jia-Xing Song; Xiang Fang; Tao Guo; Feng-Li Bei; Wen Ding; Xiao-Nan Zhang; Miao Yao; Hong-Jun Yu

Thermal properties and kinetics of Al/α-MnO2 nanostructure thermite was reported in this work. According to DSC curves, the heat release and onset temperature were measured. Then the changes of activation energy on extent of conversion (α) for kinetics of Al/α-MnO2 thermite were obtained by using isoconversional method.


Published online: August 29, 2017.

J. Braz. Chem. Soc. 2017

Absolute Configuration of Solenopsis Piperidines is a Tool to Classify Fire Ants (Formicidae:Myrmicinae)

Francisca D. S. Araújo; Marcela A. Botelho; José R. Trigo; Anita J. Marsaioli

Chiral GC chromatogram of the peak discrimination of 2-methyl-6-undecylpiperidine trifluoroacetamide stereoisomers (synthetic standard mixture).


Published online: August 24, 2017.

J. Braz. Chem. Soc. 2017

Comparative Study of the Lipid Profiles of Oils from Kernels of Peanut, Babassu, Coconut, Castor and Grape by GC-FID and Raman Spectroscopy

William S. Martini; Brenda L. S. Porto; Marcone A. L. de Oliveira; Antonio C. Sant'Ana

A fast evaluation of the degree of unsaturation and the presence of oxidized products in oil samples by Raman spectroscopy, through the identification of marker bands, assigned by supporting of GC-FID analyses of standard fatty acids.


Published online: August 24, 2017.

J. Braz. Chem. Soc. 2017

Suspended and Immobilized TiO2 Photocatalytic Degradation of Estrogens: Potential for Application in Wastewater Treatment Processes

Marcus V. de Liz; Rubia M. de Lima; Bianca do Amaral; Belisa A. Marinho; Jessica T. Schneider; Noemi Nagata; Patricio Peralta-Zamora

Photocatalytic degradation of estrogens by suspended and immobilized TiO2 were compared in aqueous and wastewater samples. The EE2 degradation products were monitored by GC-MS/MS.


Published online: August 24, 2017.

J. Braz. Chem. Soc. 2017

Effect of Selenite and Selenate Application on Mineral Composition of Lettuce Plants Cultivated Under Hydroponic Conditions: Nutritional Balance Overview Using a Multifaceted Study

Emanueli do Nascimento da Silva; Mirla Cidade; Gabriel Heerdt; Rafael L. Ribessi; Nelson H. Morgon; Solange Cadore

Selenate and selenite enrichment in the Veneza Roxa lettuce was carried out and the mineral composition was evaluated using ICP OES, PCA and molecular modeling. Selenate-biofortified lettuce showed a synergetic effect with S and Mo while selenite-biofortified lettuce showed a synergetic effect with Mn, P, Mg and Ca.


Published online: August 17, 2017.

J. Braz. Chem. Soc. 2017

Morpho/Proteomic Comparative between High Grade Pleomorphic Sarcoma and Metastasis Diagnosed in an Old Captive Common Hippo

Adriana R. Silva; José T. J. G de Lacerda; Bernadete Faria; Isabela W. da Cunha; Vitor P. de Andrade; Nilson A. Assunção

Mass spectrometry analysis as additional tool for description and differentiation of tumor physiopathology: a comparative proteomic study between pheomorphic sarcoma, metastasis and healthy tissues.


Published online: August 17, 2017.

J. Braz. Chem. Soc. 2017

Alkaline Solubilization of Chicken Tissues Monitored by Raman Spectroscopy Followed by Pb Determination by GF AAS

Náira S. Campos; Marcone A. L. de Oliveira; Celly M. S. Izumi; Rafael A. de Sousa

Lead content was evaluated in chicken viscera by GF AAS after solubilization with tetramethylammonium hydroxide (TMAH). Sample preparation was monitored by Raman spectroscopy and SEM-EDS.


Published online: August 16, 2017.

J. Braz. Chem. Soc. 2017

Synthesis, Antioxidant Activity, Acetylcholinesterase Inhibition and Quantum Studies of Thiosemicarbazones

Larissa Sens; Aldo S. de Oliveira; Alessandra Mascarello; Inês M. C. Brighente; Rosendo A. Yunes; Ricardo J. Nunes

The current study investigated the antioxidant activity, acetylcholinesterase inhibition and quantum studies of thiosemicarbazones.


Published online: August 4, 2017.

J. Braz. Chem. Soc. 2017

Preparation of Tetraethylenepentamine Modified Magnetic Graphene Oxide for Adsorption of Dyes from Aqueous Solution

Xiaosheng Tang; Ping Tang; Liangliang Liu

Tetraethylenepentamine modified magnetic graphene oxide nanomaterial was prepared and it had a good adsorption ability to remove dyes in wastewater.


Published online: August 2, 2017.

J. Braz. Chem. Soc. 2017

SBA-15 as a Support for Nickel-Based Catalysts for Polymerization Reactions

Anderson J. Schwanke; Cristiano Favero; Rosana Balzer; Katia Bernardo-Gusmão; Sibele B. C. Pergher

Polymerization reaction with a nickel-based catalyst supported on SBA-15 mesoporous materials.


Published online: August 1, 2017.

J. Braz. Chem. Soc. 2017

Functionalization of Bentonite and Vermiculite after the Creation of Structural Defects through an Acid Leaching Process

Dorsan S. Moraes; Lucas C. R. Miranda; Rômulo S. Angélica; Geraldo N. Rocha Filho; José R. Zamian

Schematic model of a 2:1 layer structure of the organofunctionalized materials present in this work, suggesting the superficial acid sites created.


Published online: July 31, 2017.

J. Braz. Chem. Soc. 2017

Surface Imprinting of Silica Gel by Methyldopa and Its Application in the Solid Phase Extraction Procedure

Mohammad Taghi Vardini; Leila Mardani

Surface of the activated silica gel was grafted with the complex of MTD-APS. The custom made holes to the MTD remain on the surface of molecularly imprinted adsorbent.


Published online: July 24, 2017.

J. Braz. Chem. Soc. 2017

Identification of Anti-Inflammatory and Anti-Hypertensive Drugs as Inhibitors of Bacterial Diguanylate Cyclases

Helton J. Wiggers; Edson Crusca; Éverton E. D. Silva; Juliana Cheleski; Naiara U. Torres; Marcos V. A. S. Navarro

Virtual screening applied to FDA-approved drugs allowed the inhibitor discovery for enzymes diguanylate ciclases involved in the bacterial biofilm formation.


Published online: July 24, 2017.

Short Report J. Braz. Chem. Soc. 2017

Fast Screening of Solvents for Simultaneous Extraction of Furfural, 5-Hydroxymethylfurfural and Levulinic Acid from Aqueous Solution Using SMD Solvation Free Energies

Ellen V. Dalessandro; Josefredo R. Pliego Jr.

Automated computational screening of 178 solvents for extraction of organic chemicals from aqueous phase.


Published online: July 20, 2017.

Articles J. Braz. Chem. Soc. 2017

Evaluation of the Concentration of Cu, Zn, Pb and Cr in Different Fish Species from the São Gonçalo Channel in Pelotas-RS, Brazil

Marcelo M. Alves; Aline L. Medina; Ane Martiele T. Pinto; Ana Clara N. Antunes; Pedro José Sanches Filho; Anderson S. Ribeiro; Mariana A. Vieira

The concentration of Cu, Zn, Cr and Pb in different species of fish collected in the estuarine and limnic regions of the São Gonçalo channel in Pelotas City were determined.


Published online: July 18, 2017.

J. Braz. Chem. Soc. 2017

Use of Amphiphilic Composites based on Clay/Carbon Nanofibers as Fillers in UHMWPE

Claudilene R. Silva; Rochel M. Lago; Helena S. Veloso; Patrícia S. O. Patricio

The more efficient interaction of the fillers based on hydrophobic surface nanostructures with the hydrophobic UHMWPE chains leading to a much higher dispersion of the filler particles throughout the polymeric matrix.


Published online: July 14, 2017.

J. Braz. Chem. Soc. 2017

Synthesis of 3,5-Diarylisoxazole Derivatives and Evaluation of in vitro Trypanocidal Activity

Aline A. N. de Souza; Viviane F. Xavier; Gleicekelly S. Coelho; Policarpo A. Sales Junior; Alvaro J. Romanha; Silvane M. F. Murta; Claudia M. Carneiro; Jason G. Taylor

A series of novel substituted isoxazoles were prepared and tested for in vitro anti T. cruzi activity. The lead compound is equally as potent as reference drug benzonidazole.


Published online: July 13, 2017.

J. Braz. Chem. Soc. 2017

Hirshfeld Surfaces and Nonlinear Optics on Two Conformers of a Heterocyclic Chalcone

Jean M. F. Custodio; Cauã A. Moreira; Clodoaldo Valverde; Gilberto L. B. de Aquino; Basílio Baseia; Hamilton B. Napolitano

The nature of crystal packing of an heterocyclic chalcone, investigated by Hirshfeld surfaces, and its potential nonlinear optical properties.


Published online: July 13, 2017.

J. Braz. Chem. Soc. 2017

Evaluation of Crocins in Cheeses Made with Saffron by UHPLC

Mena Ritota; Maria Mattera; Maria Gabriella Di Costanzo; Pamela Manzi

Cheeses made with saffron are expected to provide an added value for consumers, due to saffron bioactive compounds. This UHPLC method seems to be useful to detect saffron crocins in dairy products.


Published online: July 13, 2017.

J. Braz. Chem. Soc. 2017

Binary Blends of Biodiesel from Macauba (Acromia aculeata) Kernel Oil with Other Biodiesels

Willian L. G. da Silva; Acacia A. Salomão; Patricia T. de Souza; Marina Ansolin; Matthieu Tubino

The oil from the kernel of macauba presents high stability to oxidation, property that is transferred to its biodiesel, which also presents low cold filter plugging point. Such properties are inherited by its blends with biodiesels obtained from other vegetable oils.


Published online: July 13, 2017.

J. Braz. Chem. Soc. 2017

A Novel Electrochemical Aptamer Biosensor Based on DNAzyme Decorated Au@Ag Core-Shell Nanoparticles for Hg2+ Determination

Yanling Zhao; Xianmei Xie

Based on thymine-Hg2+-thymine binding mode (T-Hg2+-T), a sensitive aptamer biosensor was constructed by utilizing functionalized Au@Ag core-shell nanoparticles as labels for detection of Hg2+.


Published online: July 11, 2017.

J. Braz. Chem. Soc. 2017

Nanoporous Gold Surface: An Efficient Platform for Hydrogen Evolution Reaction at Very Low Overpotential

Anandhakumar Sukeri; Mauro Bertotti

A nanostructured porous gold based electrocatalyst was fabricated via a facile electrochemical approach and an excellent activity with good stability for hydrogen evolution reaction was noticed.


Published online: July 10, 2017.

J. Braz. Chem. Soc. 2017

Synthesis and Application of Bimetallic Zinc(II) Phenoxy-Imine Complexes as Initiators for Production of Lactide Polymers

Alana L. C. Oliveira; Leonardo C. Ferreira; Marcos L. Dias; Rodrigo S. Bitzer; Marco A. C. Nascimento; Maria de Fátima V. Marques; Laura Crociani

Bimetallic ZnII complexes with phenoxy-imine ligands were synthesized and used as initiators for lactide polymerization.


Published online: July 10, 2017.

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