JBCS



8:16, ter jan 21








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.

Artigos no Prelo


Artigos

CONVERSÃO FOTOELETROCATALÍTICA DE CO2 E BIOGÁS EM PRODUTOS DE INTERESSE ENERGÉTICO UTILIZANDO SEMICONDUTORES NANOESTRUTURADOS DE Ti/TiO2 MODIFICADOS COM ÓXIDO DE COBRE

Laís Bresciani; Letícia Vognach; Carlos Henrique Lagemann; Simone Stülp

The objective of the work is to modify nanostructured semiconductors of Ti/TiO2 with copper oxide for application in the photoelectrocatalytic conversion of CO2 and biogas in fuel products of energetic interest.

http://dx.doi.org/10.21577/0100-4042.20170463

Publicado online: janeiro 16, 2020
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INFLUÊNCIA DO IMPEDIMENTO ESTÉRICO DE LIGANTES ANCILARES EM COMPLEXOS A BASE DE RU APLICADOS EM METÁTESES DO ÁLCOOL E ACETATO CINAMÍLICOS

Vanessa B. Vieira; Eliada A. da Silva; Valdemiro P. Carvalho Jr.; Benedito S. Lima-Neto; José L. S. Sá

Cinnamic derivative compounds are catalyzed by Grubbs Ru-catalysts which present distinct results based on the different electronic and steric contributions of the catalysts.

http://dx.doi.org/10.21577/0100-4042.20170462

Publicado online: janeiro 14, 2020
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IDENTIFICAÇÃO DE ADULTERANTES DE BIODIESEL METÍLICO DE CRAMBE EM MISTURAS COM DIESEL, USANDO FT-MIR E CARTAS DE CONTROLE MULTIVARIADAS BASEADAS NO SINAL ANALÍTICO LÍQUIDO

Baltazar Vasco Sitoe; Lucas Gustavo da Costa; Brendon Araújo dos Santos; Douglas Queiroz Santos; Waldomiro Borges Neto

The spectra of calibration samples were decomposed into three vectors: NAS, Interference and Residual. From these vectors the statistical limits were calculated and the multivariate control charts were constructed. The scalar values NAS, D and Q of each sample were plotted on the respective charts.

http://dx.doi.org/10.21577/0100-4042.20170461

Publicado online: janeiro 14, 2020
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NEW APPLICATIONS FOR AMOXICILLIN DETERMINATION IN PURE FORM AND PHARMACEUTICALS BASED ON IODATE-IODIDE MIXTURE: TITRIMETRY AND SPECTROSCOPY STUDIES

Nagib A. S. Qarah; Sameer A. M. Abdulrahman; Faisal K. Algethami; Kanakapura Basavaiah; Ezzouhra El-Maaiden

In this study, one titrimetric and two spectrophotometric methods are developed for the determination of amoxicillin (AMX) in bulk drug and dosage forms using iodate-iodide mixture reagent.

http://dx.doi.org/10.21577/0100-4042.20170455

Publicado online: dezembro 16, 2019
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ANALYTICAL EXPRESSIONS FOR THE CONCENTRATION AND CURRENT IN THE REDUCTION OF HYDROGEN PEROXIDE AT A METAL-DISPERSED CONDUCTING POLYMER FILM

Rajagopal Swaminathan; Kothandapani Venugopal; Muthuramalingam Rasi; Marwan Abukhaled; Lakshmanan Rajendran

Schematic diagram for the reduction of hydrogen peroxide to water.

http://dx.doi.org/10.21577/0100-4042.20170454

Publicado online: dezembro 12, 2019
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A RENEWABLE CATALYST FOR A RENEWABLE CHEMICAL: GRAM-SCALE CONVERSION OF FURFURAL TO FURFURYL ALCOHOL BY THE CARROT (Daucus carota)

Alvaro T. Omori; Marina G. Capeletto; Daniela Y. Yamamoto; Ronaldo E. de Oliveira Filho

Carrot root can act as catalyst to reduce furfural to furfuryl alcohol. This low-cost reaction is conducted under eco-friendly conditions.

http://dx.doi.org/10.21577/0100-4042.20170451

Publicado online: dezembro 6, 2019
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DESENVOLVIMENTO DE METODOLOGIAS ANALÍTICAS PARA DETERMINAÇÃO DE CLORPIRIFÓS EM AMOSTRAS AQUOSAS EMPREGANDO A MICROEXTRAÇÃO LÍQUIDO-LÍQUIDO DISPERSIVA SEGUIDA POR HPLC-UV

Adão S. Oliveira; Leandro Honório; Mayara L. de Matos; João Batista G. de Souza

In method 1: the extraction solvent mixed with a dispersing solvent it injected into the aqueous sample. In method 2: The extractive solvent it injected and then the sample is heated. At the end, the extractive solvent is solubilized in methanol and the chlorpyrifos determined by HPLC-UV.

http://dx.doi.org/10.21577/0100-4042.20170453

Publicado online: dezembro 4, 2019
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CALISTEGINAS, ALCALÓIDES POLIHIDROXILADOS PRESENTES EM HORTALIÇAS: FRUTOS E TUBEROSAS

Luís Fernando L. Souto; Antonio Jorge Ribeiro da Silva

Vegetable cultivars of human consumption in Brazil have been analyzed for calystegines presence. They were found in the whole sample set.

http://dx.doi.org/10.21577/0100-4042.20170452

Publicado online: dezembro 4, 2019
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NANO-ENCAPSULATION OF Lippia origanoides KUNTH. ESSENTIAL OIL BY CHITOSAN-CAFFEIC ACID NANOGEL

Elisa T. S. Damasceno; Regiamara R. Almeida; Stephanne Y. B. de Carvalho; Sara S. Vieira; Valdir Mano; Luiz Gustavo de L. Guimarães

Development of chitosan nanogel bound to caffeic acid, to be used in the encapsulation of the essential oil of Lippia origanoides, in order to enable its use as an antioxidant.

http://dx.doi.org/10.21577/0100-4042.20170450

Publicado online: novembro 27, 2019
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SÍNTESE, ATIVIDADE ANTILESHMANIA E CITOTÓXICA DE HIDRAZONAS DERIVADAS DE ALDEÍDOS NATURAIS

Débora Caroline Marques de Souza; Valéria Carlos de Sousa; Lucas Pereira Lima da Cruz; Sabrina Maria Portela Carneiro; Michel Muálem de Moraes Alves; Fernando Aécio de Amorim Carvalho; Marcília Pinheiro da Costa; Cíntia Marques Corrêa; Arlan de Assis Gonsalves; Cleônia Roberta Melo Araújo

Illustration of two routes of synthesis to obtain five new hydrazones. All the synthesized molecules were tested for antileishmanial and cytotoxic activity.

http://dx.doi.org/10.21577/0100-4042.20170440

Publicado online: novembro 13, 2019
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ANALYSIS OF THE BASELINE DRIFT ARTIFACT IN HADAMARD TRANSFORM SEPARATION TECHNIQUES

Yan Hong; Jingming Su; Chaoli Tang; Chaogun Huang; Sheng Liu; Yannan Chu

Analyzing and removing the base drift phenomenon of Hadamard transform technique.

http://dx.doi.org/10.21577/0100-4042.20170434

Publicado online: outubro 31, 2019
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PERFIL METABÓLICO DOS EXTRATOS POLARES DAS FOLHAS, GALHOS E CASCAS DE Copaifera multijuga HAYNE (COPAÍBA MARI-MARI DA AMAZÔNIA) POR ESI-EM

Davi S. Oliveira; Leandro S. Lima; Ananda S. Antonio; Larrisa S. M. Wiedemann; Valdir F. Veiga-Junior

Polar extracts of Copaifera multijuga plant parts (leaves, branches and barks) were analysed by direct insertion in ESI-QqQ-MS and MS2 fragmentation. Several polyphenols were suggested and the metabolic profiles analysed by PCA.

http://dx.doi.org/10.21577/0100-4042.20170418

Publicado online: outubro 3, 2019
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Nota Técnica

PARTICLE SIZE DISTRIBUTION APPLIED TO MILK POWDER REHYDRATION

Júlia d'Almeida Francisquini; Evandro Martins; Isis Rodrigues Toledo Renhe; Luiz Fernando Cappa de Oliveira; Rodrigo Stephani; Ítalo Tuler Perrone; Antônio Fernandes de Carvalho

Whole powder milks were analyzed by scanning electron microscopy and particle size analysis. By statistical analysis a more modern rehydration index was developed as a complement to the technique that is usually used to determine powders rehydration.

http://dx.doi.org/10.21577/0100-4042.20170466

Publicado online: janeiro 21, 2020
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UM CONJUNTO DE PLANILHAS ELETRÔNICAS PARA IDENTIFICAÇÃO E QUANTIFICAÇÃO DE CONSTITUINTES DE ÓLEOS ESSENCIAIS

Humberto R. Bizzo; Eduardo G. Barboza; Marcelly C. S. Santos; Paola E. Gama

Electronic sheets for fast data handling on both qualitative and quantitative analyzes of essential oils.

http://dx.doi.org/10.21577/0100-4042.20170458

Publicado online: janeiro 8, 2020
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QUANTIFICAÇÃO DE CANABINOIDES EM EXTRATOS MEDICINAIS DE Cannabis POR CROMATOGRAFIA LÍQUIDA DE ALTA EFICIÊNCIA

Virgínia M. Carvalho, Andrey F. L. Aguiar, Leopoldo C. Baratto, Fábio L. C. Souza, Ernesto D. Rocha

Cannabinoids were extracted by solvents and ultrasound. The samples were refrigerated and centrifuged to separate the lipids. Cannabinoids were separated and quantified by HPLC method.

http://dx.doi.org/10.21577/0100-4042.20170457

Publicado online: janeiro 8, 2020
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Educaçao

INFLUÊNCIA DA FREQUÊNCIA E PARTICIPAÇÃO NO DESEMPENHO EM UM AMBIENTE DE APRENDIZAGEM CENTRADO NO ALUNO

Camila Aparecida Tolentino Cicuto; Bayardo Baptista Torres

Organizational representation of study periods and discussion groups. Students: white circles; teacher: black circle and monitor: gray circle.

http://dx.doi.org/10.21577/0100-4042.20170464

Publicado online: janeiro 16, 2020
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EXTRATOS DE Lilium sp., Agapanthus sp. E Hydrangea sp.: COMPORTAMENTO COMO INDICADORES NATURAIS EM DIFERENTES FAIXAS DE PH

Jhulli M. da Silva; Renata de C. Martins; Fabiele Bernardi; Camila de M. R. dos Santos; Keller P. Nicolini; Jaqueline Nicolini

An experimental propose using flowers extracts: The picture shows the flowers used to extract the dyes in presence of H+ and OH- ions (indicating the tests done in aqueous solutions).

http://dx.doi.org/10.21577/0100-4042.20170459

Publicado online: janeiro 10, 2020
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USO DA TEORIA DO FUNCIONAL DE DENSIDADE NA ANÁLISE DE SPIN CROSSOVER EM AULAS DE QUÍMICA INORGÂNICA

Karina de Carvalho Pougy; Sérgio de Paula Machado

Predicting spin crossover through Density Functional Theory and using in Inorganic Chemistry classes.

http://dx.doi.org/10.21577/0100-4042.20170456

Publicado online: dezembro 19, 2019
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INTERAÇÕES INTERMOLECULARES E O FENÔMENO DA SOLUBILIDADE: EXPLICAÇÕES DE GRADUANDOS EM QUÍMICA

Marianna M. Junqueira; Flavio A. Maximiano

This article analyses the students' answers and representations about intermolecular interactions involved between oxygen gas and water.

http://dx.doi.org/10.21577/0100-4042.20170449

Publicado online: novembro 27, 2019
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ONE-POT DIASTEREOSELECTIVE SYNTHESIS OF CHIRAL TRICYCLIC L-CYSTEINE AND D-PENICILLAMINE DERIVATIVES: A LABORATORY EXPERIMENT

Maria I. L. Soares; Susana M. M. Lopes; Dina Murtinho; Teresa M. V. D. Pinho e Melo

A one-pot diastereoselective synthesis of thiazolidine-ring fused systems derived from enantiomerically pure amino acids is described as an experiment to be carried out by upper-division undergraduate students in a laboratory classroom.

http://dx.doi.org/10.21577/0100-4042.20170448

Publicado online: novembro 21, 2019
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PRACTICAL ASPECTS OF THE ANALYSIS OF THE PROGRESSION CURVES OF FIRST AND PSEUDO-FIRST ORDER REACTIONS

Joanna Nackiewicz; Józef Hurek; Aneta Wróbel

Conductometric monitoring of the basic hydrolysis of an ester using a digital data acquisition kit. The progress curve with the trend line calculated based on the iteratively determined asymptote.

http://dx.doi.org/10.21577/0100-4042.20170447

Publicado online: novembro 21, 2019
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Assuntos Gerais

SÓ ERRA QUEM FAZ, E QUEM FAZ ERRA! UM MANIFESTO PELO CÁLCULO DA PROPAGAÇÃO DE INCERTEZAS

Luís Moreira Gonçalves

The equation of propagation of uncertainty is a simple and powerful equation that chemists should apply wisely and more often.

http://dx.doi.org/10.21577/0100-4042.20170460

Publicado online: janeiro 14, 2020
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On-line version ISSN 1678-7064 Printed version ISSN 0100-4042
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