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10:41, seg nov 4

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EDIÇÃO ATUAL vol. 43, No. 1, 2020



Artigo de Capa
Quim. Nova 2020, 43(1), 16-23

Nano-encapsulation of Lippia origanoides Kunth. essential oil by chitosan-caffeic acid nanogel

Elisa T. S. DamascenoI; Regiamara R. AlmeidaI; Stephanne Y. B. de CarvalhoI; Sara S. VieiraII; Valdir ManoI; Luiz Gustavo de L. GuimarãesI,*

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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Total access: 1569

Artigo Quim. Nova 2020, 43(1), 1-8

 

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 SitoeI,II,*; Lucas Gustavo da CostaI; Brendon Araújo dos SantosI; Douglas Queiroz SantosIII; Waldomiro Borges NetoI


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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Total access: 1178

Quim. Nova 2020, 43(1), 9-15

 

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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Quim. Nova 2020, 43(1), 24-31

 

Influência do impedimento estérico de ligantes ancilares em complexos a base de Ru aplicados em metáteses do álcool e acetato cinamílicos

Vanessa B. VieiraI; Eliada A. da SilvaII; Valdemiro P. Carvalho Jr.III; Benedito S. Lima-NetoII,*; José L. S. SáI,*


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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Total access: 1317

Quim. Nova 2020, 43(1), 32-36

 

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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Total access: 1401

Quim. Nova 2020, 43(1), 37-43

 

Calisteginas, alcalóides polihidroxilados presentes em hortaliças: frutos e tuberosas

Luís Fernando L. SoutoI,*; Antonio Jorge Ribeiro da SilvaII


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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Total access: 1717

Quim. Nova 2020, 43(1), 44-49

 

New applications for amoxicillin determination in pure form and pharmaceuticals based on iodate-iodide mixture: titrimetry and spectroscopy studies

Nagib A. S. Qarah*,I; Sameer A. M. AbdulrahmanII; Faisal K. Algethami#,III; Kanakapura BasavaiahIV; Ezzouhra El-MaaidenV


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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Total access: 1885

Quim. Nova 2020, 43(1), 50-57

 

Síntese, atividade antileshmania e citotóxica de hidrazonas derivadas de aldeídos naturais

Débora Caroline Marques de SouzaI; Valéria Carlos de SousaII; Lucas Pereira Lima da CruzII; Sabrina Maria Portela CarneiroII; Michel Muálem de Moraes AlvesIII; Fernando Aécio de Amorim CarvalhoIV; Marcília Pinheiro da CostaII; Cíntia Marques CorrêaI; Arlan de Assis GonsalvesI; Cleônia Roberta Melo AraújoI,*


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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Total access: 1907

Quim. Nova 2020, 43(1), 58-65

 

Analytical expressions for the concentration and current in the reduction of hydrogen peroxide at a metal-dispersed conducting polymer film

Rajagopal SwaminathanI; Kothandapani VenugopalII; Muthuramalingam RasiIII; Marwan AbukhaledIV; Lakshmanan RajendranV,*


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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Total access: 1274

Quim. Nova 2020, 43(1), 66-71

 

Analysis of the baseline drift artifact in hadamard transform separation techniques

Yan HongI,II; Jingming SuI; Chaoli TangI; Chaoqun HuangII,*; Sheng LiuIII; Yannan ChuII


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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Total access: 1347

Quim. Nova 2020, 43(1), 72-77

 

Perfil metabólico dos extratos polares das folhas, galhos e cascas de Copaifera multijuga hayne (Copaíba mari-mari da Amazônia) por ESI-EM

Davi S. OliveiraI; Leandro S. LimaI; Ananda S. AntonioI; Larissa S. M. WiedemannI; Valdir F. Veiga-JuniorI,II,*


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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Total access: 2049

Revisão Quim. Nova 2020, 43(1), 78-89

 

Há algo novo no reconhecimento molecular aplicado à química medicinal?

Harold H. FokoueI; Pedro S. M. PinheiroI; Carlos A. M. FragaI; Carlos M. R. Sant'AnnaII,*


Molecular recognition of a ligand by its target is essential. Are there are new insights in molecular interactions to explore for improvement of the ligand affinity with its target?

http://dx.doi.org/10.21577/0100-4042.20170474

Publicado online: fevereiro 6, 2020
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Total access: 2336

Nota Técnica Quim. Nova 2020, 43(1), 90-97

 

Quantificação de canabinoides em extratos medicinais de Cannabis por cromatografia líquida de alta eficiência

Virgínia M. CarvalhoI,*; Andrey F. L. AguiarI; Leopoldo C. BarattoII; Fábio L. C. SouzaI; Ernesto D. RochaI


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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Total access: 2698

Quim. Nova 2020, 43(1), 98-105

 

Um conjunto de planilhas eletrônicas para identificação e quantificação de constituintes de óleos essenciais

Humberto R. BizzoI,*; Eduardo G. BarbozaII; Marcelly C. S. SantosI; Paola E. GamaI


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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Total access: 2348

Educação Quim. Nova 2020, 43(1), 106-117

 

Interações intermoleculares e o fenômeno da solubilidade: explicações de graduandos em química

Marianna M. JunqueiraI; Flavio A. MaximianoII,*


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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Total access: 2968

Quim. Nova 2020, 43(1), 118-122

 

Practical aspects of the analysis of the progression curves of first and pseudo-first order reactions

Joanna Nackiewicz*; Józef Hureka and 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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Total access: 1247

Quim. Nova 2020, 43(1), 123-126

 

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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Total access: 1727

Quim. Nova 2020, 43(1), 127-130

 

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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Total access: 1622

Carta ao Editor Quim. Nova 2020, 43(1), 131-132

 

A surpreendente trajetória de um livro rebelde

Silvio CunhaI,II


http://dx.doi.org/10.21577/0100-4042.20170468

Publicado online: janeiro 23, 2020
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Total access: 836

On-line version ISSN 1678-7064 Printed version ISSN 0100-4042
Química Nova
Publicações da Sociedade Brasileira de Química
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