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7:08, qua nov 22








Autores: A partir do fascículo 39/9 a revista Química Nova adotou a licença CC-BY. Mais informações a respeito dessa licença podem ser obtidas aqui.

Edição Atual vol. 40, No. 9, 2017, p. 971-1135

 

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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 2017, 40(9), 1094-1110

Contaminantes emergentes em matrizes aquáticas do brasil: cenário atual e aspectos analíticos, ecotoxicológicos e regulatórios

Cassiana C. MontagnerI,*; Cristiane VidalI; Raphael D. AcayabaII

We know very little about the levels of emerging contaminants in Brazilian aquatic matrices. Our monitoring programs should go beyond the current regulated compounds.

http://dx.doi.org/10.21577/0100-4042.20170091

Publicado online: julho 11, 2017
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Artigos Quim. Nova 2017, 40(9), 971-975

 

Development and validation of an HPLC-DAD analytical method to quantify 5-methoxyflavones in methanolic extracts of Vochysia divergens pohl cultured under stress conditions

Letícia Pereira PimentaI; Luís Claúdio Kellner FilhoI; Bruna Arruda Soares ParpinelliII; Katia Aparecida de SiqueiraII; Marcos Antônio SoaresII; Márcio Luís Andrade e SilvaI; Wilson Roberto CunhaI; Patrícia Mendonça PaulettiI; Ana Helena JanuárioI,*


Development and validation of an HPLC-DAD analytical method to quantify 5-methoxyflavones in methanolic extracts of V. divergens cultured plants inoculated with endophytic fungi and subjected to water stress.

http://dx.doi.org/10.21577/0100-4042.20170096

Publicado online: julho 19, 2017
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Quim. Nova 2017, 40(9), 976-982

 

Estudio computacional de la interacción N∙∙∙C en sistemas moleculares (R)nN-CO2 (N=1,2,3)

Cristian J. Guerra*; Adolfo E. Ensuncho; Juana R. Robles


The N···C interaction is responsible for adsorption / absorption of CO2 on amines.

http://dx.doi.org/10.21577/0100-4042.20170105

Publicado online: agosto 15, 2017
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Quim. Nova 2017, 40(9), 983-988

 

Estudo químico de eflorescências salinas do sítio arqueológico Toca Exú do Jurubeba do Parque Nacional Serra da Capivara, Piauí, Brasil

Benedito Batista Farias FilhoI,*; Maria Conceição S. Meneses LageII; Rássius Alexandre Medeiros LimaI


Chemical analysis of salt efflorescence of rock art sites aiming at the conservation of cultural heritage.

http://dx.doi.org/10.21577/0100-4042.20170100

Publicado online: agosto 3, 2017
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Quim. Nova 2017, 40(9), 989-997

 

Desempenho do eletrodo de filme de paládio na determinação de tálio e chumbo em amostras de águas naturais por voltametria de redissolução anódica com pulso diferencial

Jorge Luís O. SantosI; Oldair D. LeiteII,*; Clayton Ricardo JanoniIII; Djane S. de JesusIV; Ana Maria P. dos SantosV


Performance of a palladium film electrode for the determination of thallium and lead in Western Bahia, Brazil.

http://dx.doi.org/10.21577/0100-4042.20170097

Publicado online: julho 19, 2017
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Quim. Nova 2017, 40(9), 998-1002

 

Um novo complexo híbrido formado a partir de piplartina e o íon vanadila: síntese, caracterização e estudo da atividade biológica

Giselle B. BezerraI; Janete M. AraújoII; Mônica F. BelianI; Wagner E. da SilvaI; Clécio S. RamosI,*


Synthesis, characterization and antimicrobial potential of amide piplartine and its complex with vanadyl ion.

http://dx.doi.org/10.21577/0100-4042.20170098

Publicado online: julho 19, 2017
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Quim. Nova 2017, 40(9), 1003-1008

 

Bioproduction and characterization of sodium, potassium, and calcium lactobionates

Maria G. DelagustinI,*; Eduarda GonçalvesI; Sabrina CarraI; Thiago BarcellosI; Valquíria L. BassaniII; Mauricio M. SilveiraI; Eloane MalvessiI


Lactobionic acid and its salts (lactobionates) are substances that have several applications in pharmaceutical area. These products were obtained by enzymatic complex glucose-fructose-oxidoreductase (GFOR)/gluconolactonase (GL) present in the periplasm of Zymomonas mobilis cells.

http://dx.doi.org/10.21577/0100-4042.20170108

Publicado online: agosto 22, 2017
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Quim. Nova 2017, 40(9), 1009-1017

 

Caracterização elementar da casca de arroz e suas cinzas por MIP OES após decomposição ácida com sistema de refluxo

Emanoelli R. LopesI; Aline L. MedinaI; Anderson S. RibeiroI; João N. BrandaliseII; Adriane M. NunesI,*


This paper presents an efficient method of preparation of samples of rice husk and rice husk ash for subsequent determination of metals by MIP OES.

http://dx.doi.org/10.21577/0100-4042.20170119

Publicado online: setembro 12, 2017
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Quim. Nova 2017, 40(9), 1018-1024

 

Avaliação de diferentes rotas de esfoliação líquida para obtenção de nanolamelas de nitreto de boro hexagonal

Mayara Regina MunaroI,II; Heloisa Nunes da MottaI; Joseane V. GulmineI; Luciane TulioI; Nuno G. AdonisIII; Marilda MunaroI,II,*; Edemir Luiz KowalskiI,II


Hexagonal boron nitride (h-BN) bulk was dispersed in isopropyl alcohol (IPA) or a mixture of IPA and deionized water and subjected to ultrasonication and centrifugation to obtain mono and a few layers suspension of h-BN nanosheets.

http://dx.doi.org/10.21577/0100-4042.20170122

Publicado online: setembro 15, 2017
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Quim. Nova 2017, 40(9), 1025-1034

 

Modelado de partículas PM10 y PM2.5 mediante redes neuronales artificiales sobre clima tropical de San Francisco de Campeche, México

Alberto Antonio Espinosa GuzmánI; Oscar May TzucII; Isaías Balam PantíIII; Javier Reyes TrujequeIV; Ignacio Vicente Pérez QuintanaII; Ali BassamII,*


Multi-layer perceptron mathematical model developed for prediction of PM10 and PM2.5 atmospheric particulate concentrations. The model was validated using experimental variables not included during the training and testing phases.

http://dx.doi.org/10.21577/0100-4042.20170115

Publicado online: setembro 12, 2017
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Quim. Nova 2017, 40(9), 1035-1038

 

Composição química de uma população de Croton gratissimus burch (Euphorbiaceae)

Laura I. N. CaneloI; Isabel MafucaII; Rosalina S. MataII; Dina I. MendonçaI,*


Chemical composition of Croton gratissimus Burch collected in Quiita, Angola, was evaluated and fourteen compounds were isolated.

http://dx.doi.org/10.21577/0100-4042.20170101

Publicado online: agosto 3, 2017
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Quim. Nova 2017, 40(9), 1039-1044

 

Saponificação assistida por micro-ondas na extração de diterpenos em café arábica torrado

Mirelli Bianchin*; Fabio Yamashita; Marta de Toledo Benassi


The saponification reaction to obtain kahweol and cafestol in roasted arabica coffee was performed in a microwave equipment, studying the effect of temperature and reaction time on the extraction of diterpenes.

http://dx.doi.org/10.21577/0100-4042.20170116

Publicado online: setembro 12, 2017
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Quim. Nova 2017, 40(9), 1045-1050

 

Structure-activity relationship study of diterpenes for treatment of Alzheimer's disease

Gabriel F. dos SantosI; Rondinelle G. PereiraI; Maria A. D. BoaventuraI; Francisco A. MaciasII; Gesiane da S. LimaI; Amanda C. S. CoelhoI; Jose M. G. MolinilloII; Antonio CalaII; Jacqueline A. TakahashiI,*


Natural kaurane diterpenes and semi-synthetic derivatives were highly active for acetylcholinesterase inhibition. Above are represented some of the most active compounds.

http://dx.doi.org/10.21577/0100-4042.20170112

Publicado online: agosto 29, 2017
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Quim. Nova 2017, 40(9), 1051-1057

 

Microemulsion of Brazil nut oil as a natural product to improve superoxide release in human phagocytes

Karol Patel FioriI; Maycon de Paula Ribeiro TorresI; Jessica Iara SchonsI; Elton Brito RibeiroI; Roberta Martins NogueiraII; Leonardo G. VasconcelosIII; Carla R. AndrighettiI; Marcos José JacintoIII; Denia M. de S. ValladãoI,*


Development and characterization of microemulsion systems of Brazil nut oil and determination of the effect of this microemulsion on the release of superoxide in human phagocytes.

http://dx.doi.org/10.21577/0100-4042.20170113

Publicado online: agosto 29, 2017
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Quim. Nova 2017, 40(9), 1058-1064

 

Biosynthesis of industrial enzymes by free and immobilized Alicyclobacillus spp in different matrices and the use of ultrafiltration in the enzymes concentration

Suelen Pereira RuizI; Juliana Harumi MiyoshiI; Gabriela Gregolin GimenezI; Camila Ortiz MartinezI; Benício Alves de Abreu FilhoII; Graciette MatioliI,*


The biosynthesis of amylase and collagenase by Alicyclobacillus acidocaldarius and A. sendaiensis respectively, were studied, and different matrices evaluated for the immobilization of the microorganisms followed by concentration by ultrafiltration.

http://dx.doi.org/10.21577/0100-4042.20170109

Publicado online: agosto 22, 2017
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Quim. Nova 2017, 40(9), 1065-1073

 

Síntese de 2-(2-piridil)quinolinas promovida por micro-ondas e suas atividades antifúngicas

Carmindo R. BorelI; Luiz C. A. BarbosaI,II,*; Célia R. A. MalthaI; Sergio A. FernandesI; Larissa B. SantosII; Jacqueline A. TakahashiII


2-(2-Pyridyl)quinolines were obtained via a Povarov reaction under microwaves heating conditions and tested against Candida sp and Cryptococcus neoformans. Some compounds possessed a broad spectrum of action (IC50 < 1.95 µg mL-1).

http://dx.doi.org/10.21577/0100-4042.20170118

Publicado online: setembro 12, 2017
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Quim. Nova 2017, 40(9), 1074-1081

 

Predição dos teores de compostos fenólicos e flavonoides na parte aérea das espécies Secale cereale L., Avena strigosa L. e Raphanus sativus L. por meio de espectroscopia no infravermelho próximo (NIR)

Monique SouzaI,*; Shirley KuhnenII; Daniele Cristina da Silva KazamaII; Claudinei KurtzIII; Talita TrappI; Vilmar Müller JúniorI; Jucinei José CominI


Through the near infrared spectroscopy, from the spectrum reading, combinations of statistical methods and chemical data obtained in the laboratory, it is possible to construct calibration and validation models to quantify phenolic compounds in plants.

http://dx.doi.org/10.21577/0100-4042.20170120

Publicado online: setembro 12, 2017
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Revisão Quim. Nova 2017, 40(9), 1082-1093

 

Desafios relacionados à produção e aplicação das enzimas celulolíticas na hidrólise da biomassa lignocelulósica

Camila FlorencioI; Alberto Colli BadinoII; Cristiane Sanchez FarinasI,II,*


Schematic illustration of the potential strategies to address the current limitations of the enzymatic hydrolysis of lignocellulosic biomass: the production of enzymes on-site, the use of secretome analysis for enzymatic characterization and some approaches to reduce unproductive adsorption of enzymes onto lignin.

http://dx.doi.org/10.21577/0100-4042.20170104

Publicado online: agosto 3, 2017
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Nota Técnica Quim. Nova 2017, 40(9), 1111-1116

 

GC-FID methodology validation for the fatty esters content determination in biodiesel with hexadecyl acetate as the internal standard

João V. BraunI,II; Vinícius O. B. dos SantosI,II; Luiz A. M. FontouraI,II,*; Evandro PereiraIII; Amanda NappIII; Marcus SeferinIV; Jeane LimaIV; Rosane LigabueIV; Marilene H. VainsteinIII


Canola biodiesel chromatograms: (a) ethyl, (b) methyl, (c) methyl spiked with C19:0, (d) methyl spiked with C17:0, (e) methyl spiked with HDA. Hexadecyl acetate is proposed as internal standard to the fatty ester content determination in biodiesel samples by GC-FID.

http://dx.doi.org/10.21577/0100-4042.20170103

Publicado online: agosto 3, 2017
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Quim. Nova 2017, 40(9), 1117-1120

 

Telas de fósforo para projeção de imagem

Marcos Henrique Mamoru Otsuka HamanakaI,*; Michele Odnicki da SilvaI; Viviane Nogueira HamanakaII; Thebano Emílio de Almeida SantosI


The phosphor screen integrated in the field emission microscope system allows: to evaluate if nanotubes have cap; estimate the area of emission; estimate the amount of nanotubes that are emitting; compare different emitters and study the emission behavior.

http://dx.doi.org/10.21577/0100-4042.20170066

Publicado online: junho 13, 2017
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Educação Quim. Nova 2017, 40(9), 1121-1129

 

Casos investigativos para a promoção da cscl no ensino superior de química

Patrícia Fernanda de Oliveira Cabral; Nilcimar dos Santos Souza#; Salete Linhares Queiroz*


Undergraduate chemistry students' collaborative processes in a CSCL environment named eduqui.info.

http://dx.doi.org/10.21577/0100-4042.20170089

Publicado online: julho 11, 2017
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Quim. Nova 2017, 40(9), 1130-1135

 

Substituição do nitrobenzeno pelo óleo de soja como uma proposta para o ensino do método de Volhard em análise quantitativa

Bárbara Helena S. VieiraI; Roberta Barra P. LãII; José G. Rocha Jr.I; Otavio R. LãI; Cristina M. BarraI,*


End points of the titrations performed for the determination of chloride by the Volhard method aided with nitrobenzene and soybean oil.

http://dx.doi.org/10.21577/0100-4042.20170090

Publicado online: julho 11, 2017
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