JBCS



19:55, qua mar 29











Autores: informamos que, a partir do próximo fascículo (39/9), a revista Química Nova adotará a licença CC-BY. Mais informações a respeito dessa licença podem ser obtidas aqui.

vol. 37, No. 9, 2014, p. 1427-1578

 

Submission procedures for OPEN ACCESS

The Board of Directors of the Sociedade Brasileira de Química-SBQ (publisher of the Química Nova-QN) decided that QN will adopt the full open access format in which authors are required to cover part of the publication costs for their articles. See more...



Artigo de Capa
Quim. Nova 2014, 37(9), 1515-1524

Cristalização convencional de zeólitas e induzida por sementes

Luiz H. Vieira; Mariana V. Rodrigues; Leandro Martins*

Seed-assisted synthesis of zeolites diminishes crystallization time and enables the industrial use of certain zeolites

http://dx.doi.org/10.5935/0100-4042.20140229

Publicado online: agosto 11, 2014
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Artigos Quim. Nova 2014, 37(9), 1427-1435

 

Particulate matter in the indoor environment of museums in the megacity of São Paulo

Andrea CavicchioliI,*; Ericka Pardini MorroneI; Adalgiza FornaroII


In heavily polluted São Paulo (Brazil), indoor air quality in museums is impacted to varying degrees by particulate matter (PM) and black carbon (BC) particles that originate outdoors, primarily from motor vehicle emissions.

http://dx.doi.org/10.5935/0100-4042.20140260

Publicado online: setembro 22, 2014
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Quim. Nova 2014, 37(9), 1436-1440

 

Preconcentration of copper from natural water samples using ligand-less in situ surfactant-based solid phase extraction prior to faas determination

Sayed Zia MohammadiI,*; Daryoush AfzaliII; Fatemeh SabermahaniI; Samira AfshariI


Ligand-less in situ surfactant-based solid phase extraction for the preconcentration of copper from natural water samples prior to FAAS determination.

http://dx.doi.org/10.5935/0100-4042.20140239

Publicado online: agosto 28, 2014
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Quim. Nova 2014, 37(9), 1441-1445

 

Poliuretanos obtenidos a partir de aceite de higuerilla modificado y poli-isocianatos de lisina: síntesis, propiedades mecánicas y térmicas y degradación in vitro

Manuel F. Valero; Luis E. Díaz*


Biodegradable polyurethanes (PUR) were prepared from polyols derived from castor oil by transesterification of pentaerythritol-modified castor oil and lysine polyisocyanates (LDI and LTI). This study aims to examine the effect of the structure and functionality of diisocyanate on the mechanical properties and in vitro degradation of the material.

http://dx.doi.org/10.5935/0100-4042.20140228

Publicado online: agosto 11, 2014
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Quim. Nova 2014, 37(9), 1446-1452

 

Modulating the electronic structure of amino acids: interaction of model lewis acids with anthranilic acid

Tareq Irshaidat*


Interaction of a Lewis acid with an amino acid weakens the H-O bond of the carboxylic acid group and results in a spontaneous proton transfer to the nitrogen generating a zwitterion structure that incorporates a strong stabilizing N-H.O hydrogen bonding.

http://dx.doi.org/10.5935/0100-4042.20140246

Publicado online: setembro 5, 2014
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Quim. Nova 2014, 37(9), 1453-1458

 

Alcaloides isoquinolínicos e investigação das atividades antiplasmódica e antibacteriana de Guatteria citriodora (Annonaceae)

Diego de M. RabeloI; Maria L. Belém PinheiroI,*; Andersson BarisonII; Kahlil S. SaloméII; Emmanoel V. CostaIII; Felipe M. Araujo da SilvaII; Yury O. ChavesIV; Ivanildes dos S. BastosIV


Phytochemical investigations of the stem bark, leaves and twigs of Guatteria citriodora resulted in the isolation of aporphinoids and protoberberine alkaloids. The results for antiplasmodial and antibacterial activities were promising and attributed to alkaloidal constituents.

http://dx.doi.org/10.5935/0100-4042.20140233

Publicado online: agosto 27, 2014
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Quim. Nova 2014, 37(9), 1459-1464

 

Modificação do polímero condutor polianilina para uso como trocador catiônico

Rafael L. Zornitta; Guilherme Pincelli; Luís A. M. Ruotolo*


Polyaniline was modified with the large anion p-toluenesulfonate to obtain cation-exchange properties.

http://dx.doi.org/10.5935/0100-4042.20140227

Publicado online: agosto 11, 2014
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Quim. Nova 2014, 37(9), 1465-1468

 

Separation and purification of three stilbenes from the radix of Polygonum cillinerve (Nakai) Ohwl by macroporous resin column chromatography combined with high-speed counter-current chromatography

Xiaofeng Chi; Yuxiu Xing; Yuancan Xiao; Qi Dong; Fengzu Hu*


trans-resveratrol-3-O-glucoside, pieceid-2"-O-gallate and trans-resveratrol were separated and purified from the radix of Polygonum cillinerve (Nakai) Ohwl by macroporous resin column chromatography combined with high-speed counter-current chromatography.

http://dx.doi.org/10.5935/0100-4042.20140256

Publicado online: setembro 22, 2014
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Quim. Nova 2014, 37(9), 1469-1473

 

Comportamento eletroquímico e avaliação da difusão in vitro do α-tocoferol associado à iontoforese

Elisa PaludoI; Laís BrescianiII; Maurício HilgemannII; João Alberto TassinaryI; Simone StülpII,*


Iontophoresis is a method of administering substances through the skin, which uses electrical current or potential to promote transdermal delivery. This paper showed that iontophoresis increased the diffusion and degradation of α-tocopherol.

http://dx.doi.org/10.5935/0100-4042.20140232

Publicado online: agosto 27, 2014
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Quim. Nova 2014, 37(9), 1474-1478

 

Phytochemical study, antioxidant and antibacterial activities of Stemodia maritima

Francisca R. L. da SilvaI; Francisco E. A. RodriguesI; Aldenia R. S. GomesI; Angela M. C. ArriagaI,*,#; Jair MafezoliI; Telma L. G. LemosI; Macia C. S. de AlmeidaI; Gilvandete M. P. SantiagoI,II; Raimundo Braz-FilhoIII; José G. M. da CostaIV; Fabiola F. G. RodriguesIV; Henrique D. M. CoutinhoIV


Stemodinol, a new natural compound, was isolated from leaves of Stemodia maritima, and the structure was unambiguously established by 1D and 2D NMR techniques. The antioxidant and antimicrobial activities of other compounds from Stemodia maritima were investigated.

http://dx.doi.org/10.5935/0100-4042.20140255

Publicado online: setembro 22, 2014
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Quim. Nova 2014, 37(9), 1479-1486

 

Avaliação da labilidade de alumínio em infusões de erva-mate empregando voltametria adsortiva de redissolução catódica

Bruna Kauely de CamposI; Jéssica Pacheco dos PrazeresI; Yohandra Reyes TorresI, Vanessa Egéa dos AnjosI,II; Sueli Pércio QuináiaI,*


A sensitive method was developed to measure aluminum lability by employing Absorptive Cathodic Stripping Voltammetry. The bioavailable (labile) fraction of Al was determined in yerba mate infusions.

http://dx.doi.org/10.5935/0100-4042.20140226

Publicado online: agosto 11, 2014
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Quim. Nova 2014, 37(9), 1487-1490

 

Estudo químico das folhas de trichilia silvatica (meliaceae)

Aloízio de Oliveira SoaresI; Adrienn Gianny Leguizamon FerreiraII; Luzinátia Ramos SoaresIII; Joaquim CorsinoII; Fernanda Rodrigues GarcezII; Walmir Silva GarcezII,*


Phytochemical study of Trichilia silvatica led to the isolation of pregnanes and diterpenes. Clerodanes are considered potential insecticides and therefore might be responsible, along with steroids, for the larvicidal activity of the extract from leaves of T. silvatica.

http://dx.doi.org/10.5935/0100-4042.20140231

Publicado online: agosto 27, 2014
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Quim. Nova 2014, 37(9), 1491-1495

 

Phytochemical investigation of wissadula periplocifolia (L.) C. presl and evaluation of its antibacterial activity

Yanna C. F. TelesI; Roosevelt A. GomesI; Micaelly da S. OliveiraI; Kaio L. de LucenaI; José S. do NascimentoI; Maria de Fátima AgraII; John O. IgoliIII; Alexander I. GrayIII; Maria de Fátima V. de SouzaI,*


This is a phytochemical study on the Wissadula genus. The isolated compounds were obtained by usual chromatographic techniques and identified by spectroscopic analysis. The fractions and compounds from Wissadula periplocifolia showed antibacterial activity.

http://dx.doi.org/10.5935/0100-4042.20140238

Publicado online: agosto 28, 2014
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Quim. Nova 2014, 37(9), 1496-1502

 

Determinação voltamétrica de amitriptilina em formulações farmacêuticas com eletrodo de diamante dopado com boro explorando medidas em meio Ácido

Eduardo Henrique DuarteI; Felipe Augusto GorlaI; Elen Romão SartoriI; César Ricardo Teixeira TarleyI,II,*


The proposed method, based on electroxidation of amitriptyline at a boron-doped diamond electrode, is stable for several measures and demonstrates desirable features, such as good precision (intra- and inter-day) and accuracy, for routine analyses.

http://dx.doi.org/10.5935/0100-4042.20140225

Publicado online: agosto 11, 2014
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Quim. Nova 2014, 37(9), 1503-1509

 

Interactions of chitosan/genipin hydrogels during drug delivery: a QSPR approach

Nancy L. Delgadillo-ArmendarizI; Norma A. Rangel-VazquezI,*; Edgar A. Marquez-BrazonII,III; Blanca Rojas-De GascueII


Molecular electrostatic potential (MESP) of (a) chitosan/genipin and (b) chitosan (genipin)/glibenclamide calculated using the AM1 method.

http://dx.doi.org/10.5935/0100-4042.20140243

Publicado online: setembro 5, 2014
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Quim. Nova 2014, 37(9), 1510-1514

 

Simultaneous determination of four phenolic compounds in extracts of aerial parts of Ipomoea pes-caprae (L.) R. Br. (Convolvulaceae) by HPLC-UV

Daniela Maes Dutra; Cristiane da Silva Barth; Luciana Catia Block; Nara Lins Meira Quintão; Angélica Garcia Couto; Valdir Cechinel Filho; Tania Mari Bellé Bresolin


An HPLC-UV method for the determination of isoquercitrin (ISQ) and isochlorogenic acids A, B and C (ISA, ISB and ISC) in a hydroethanolic spray-dried extract of Ipomoea pes-caprae was validated and applied to study the stability of herbal drugs and extractive solutions.

http://dx.doi.org/10.5935/0100-4042.20140237

Publicado online: agosto 28, 2014
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Revisão Quim. Nova 2014, 37(9), 1525-1532

 

Resolução multivariada de curvas com mínimos quadrados alternantes: descrição, funcionamento e aplicações

Paulo Henrique MarçoI,*; Patrícia ValderramaI; Guilherme Lionello AlexandrinoII; Ronei Jesus PoppiII; Romà TaulerIII


A powerful tool for the resolution, identification and quantification of target compounds in the presence of interferences is described: MCR-ALS applications and the most recent advances, evolution, advantages and drawbacks besides new applications are provided.

http://dx.doi.org/10.5935/0100-4042.20140205

Publicado online: julho 22, 2014
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Nota Técnica Quim. Nova 2014, 37(9), 1533-1537

 

Efeitos da rugosidade superficial nas propriedades de passivação de monocamadas orgânicas automontadas

Tiago A. BenitesI; Willian C. RibeiroI; Márcio S. GóesII; Antonio A. P. FerreiraI; Paulo R. BuenoI,*


The degree of compression of the monolayer (SAMs) properties of formation and reproducibility of the electrochemical response depends on the roughness factor, with values closer to the unit being better

http://dx.doi.org/10.5935/0100-4042.20140241

Publicado online: agosto 28, 2014
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Quim. Nova 2014, 37(9), 1538-1544

 

Estudo do teste de Scott via técnicas espectroscópicas: um método alternativo para diferenciar cloridrato de cocaína e seus adulterantes

Vitor N. ConceiçãoI; Lindamara M. SouzaII; Bianca B. MerloIII; Paulo R. FilgueirasIV; Ronei J. PoppiIV; Wanderson RomãoI,II,*


Attenuated total reflection Fourier transform infrared and ultraviolet-visible spectroscopies for distinguishing between cocaine and other adulterants (lidocaine, promethazine, powdered milk and yeast) that yield positive results on the Scott test are described.

http://dx.doi.org/10.5935/0100-4042.20140240

Publicado online: agosto 28, 2014
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Educação Quim. Nova 2014, 37(9), 1545-1549

 

Experimento utilizando grãos para explorar a calibração em análises químicas#

Daniel Menezes SilvestreI; Juliana NaozukaII; Paulo Rogério Miranda CorreiaIII; Cassiana Seimi NomuraI,*


The conceptual understanding of calibration is no easy task for undergraduate students. The differences, similarities and proper application of external calibration, standard addition calibration and internal standard calibration can be explored with a simple experiment using grains.

http://dx.doi.org/10.5935/0100-4042.20140209

Publicado online: julho 22, 2014
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Quim. Nova 2014, 37(9), 1550-1558

 

Automatic evaluation and data generation for analytical chemistry instrumental analysis exercises

Arsenio Muñoz de la PeñaI,*; David Muñoz de la PeñaII; María P. Godoy-CaballeroI; David González-GómezIII; Fabio Gómez-EsternIV; Carlos SánchezII


Goodle Grading Management System (GMS) is a completely different evaluation method facilitating automatic data generation and grading for complex exercises, which enables students to independently complete personalized exercises and submit their solutions online, while receiving immediate feedback.

http://dx.doi.org/10.5935/0100-4042.20140242

Publicado online: agosto 28, 2014
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Quim. Nova 2014, 37(9), 1559-1565

 

Textos científicos de autoria de graduandos em química: análise dos professores

Jane Raquel Silva de OliveiraI; Salete Linhares QueirozII,*


Aspects of scientific language considered by chemistry professors in the evaluation of scientific texts authored by undergraduate chemistry students.

http://dx.doi.org/10.5935/0100-4042.20140236

Publicado online: agosto 27, 2014
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Quim. Nova 2014, 37(9), 1566-1572

 

Desenvolvimento de um sistema de análise por injeção em fluxo utilizando materiais alternativos de baixo custo para fins didáticos

Bruna C. S. MoreiraI; Regina M. TakeuchiI; Eduardo M. RichterII; André L. SantosI,*


Low-cost materials from hospital applications were used to build an FIA system, which was able to demonstrate the influence of the main operational parameters on the transient signals. Thus, this system can be regarded as an efficient and accessible didactic tool for teaching FIA principles.

http://dx.doi.org/10.5935/0100-4042.20140194

Publicado online: julho 15, 2014
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Quim. Nova 2014, 37(9), 1573-1578

 

Dinâmicas de inquiry no estudo de perturbações a um estado de equilíbrio químico

Hugo Vieira; Carla Morais; João Paiva*


What are the best ways to teach Science nowadays so as to serve contemporary students and society? Here we present one such approach, inquiry Modules, an inquiry dynamic, along with an example, available in full from a website, applied to teach Le Chatelier's Principle.

http://dx.doi.org/10.5935/0100-4042.20140215

Publicado online: julho 29, 2014
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