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.
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...
Brener R. C. Vale; Kayo O. Vieira; José C. L. Sousa; Jefferson L. Ferrari; Marco A. Schiavon*
With increasing particle sizes of water-soluble mercaptoethylamine-capped CdTe, the trap band energy stabilizes until the material reaches a critical size. Thereafter, the TB is not observed in the photoluminescence spectra.
Mauro A. Bueno; Boaz G. Oliveira*
The epoxidation mechanism known as the Prileschajew reaction was reinvestigated through the formation of hydrogen bonds between C2H4O and HCO2H.
Long JiaoI,*; Shan BingI; Xiaofei WangI; Zhiwei XueII; Hua LiIII
Automated correlation optimized warping is a practical method for aligning the chromatographic fingerprints of Radix Puerariae thomsonii. After this alignment, the quality of Radix Puerariae thomsonii can be correctly evaluated.
Lady M. Salas-ValeroI,*; Delia R. Tapia-BlácidoII; Florencia C. MenegalliI
The flours isolated from canihua grains (Chenopodium Pallidicaule) can form films that have low water vapor permeability and act as a good barrier to incident ultraviolet light. Films formed from both varieties of canihua grains used in this study (cupi and illpa-inia) presented a single vitreous transition temperature (< 0 °C) and show promise for potential applications in food packaging.
Beatriz Ferreira Araujo*; Marcelo Gomes de Almeida; Thiago Pessanha Rangel; Carlos Eduardo de Rezende#
Our results confirm the key role played by mangroves in controlling the fate of mercurial compounds in coastal areas. Consequently, mangrove deforestation should be considered a major source of environmental risk in tropical and subtropical coastal regions.
Vanessa R. MachadoI; Karen L. LangII; Fernando J. DuránII; Gabriela M. CabreraIII; Jorge A. PalermoIII; Eloir P. SchenkelI; Lílian S. C. BernardesI,*
Novel glycoside derivatives of dihydrocucurbitacin B were synthesized under Köenigs-Knorr and imidate reaction conditions.
Vanessa Gisele Pasqualotto SeverinoI,*; Afif Felix MonteiroI; Maria Fátima das Graças Fernandes da SilvaII; Rodrigo LucariniIII; Carlos Henrique Gomes MartinsIII
The picture describes the methodology used in the biological evaluation of Hortia species against Mycobacterium tuberculosis H37Rv, M. kansasii and M. avium, and the compounds that exhibited promising MIC values against M. tuberculosis H37Rv.
Luiz Pereira RamosI,II,*; Ricardo José BrugnagoI; Fabiano Rosa da SilvaI; Claudiney Soares CordeiroI,II; Fernando WypychI
Response surface demonstrating the ability of zinc carboxylates to promote the simultaneous esterification and transesterification of palm oil with 40% in free fatty acids.
Maria Terezinha C. Sansiviero*; Dalva Lúcia A. de Faria
ZnO/TiO2 nanocomposites were treated at different temperatures, and anatase, ZnO, and ZnTiO3 were formed when the sample was heated at 600 ºC, whereas the main phases obtained above 750 ºC were rutile and ZnTiO3. The presence of ZnTiO3 in the sample had no significant effect on the nanocomposite photocatalytic activity.
Raimundo Regivaldo G. NascimentoI; Jackelyne A. MonteiroI; Antônia Torres A. PimentaI; Maria Teresa S. TrevisanI; Raimundo Braz-FilhoII; Elnatan Bezerra de SouzaIII; Edilberto R. SilveiraI; Mary Anne S. LimaI,*
Two new flavonoids and other known compounds were obtained from extracts of the leaves and stems of Margaritopsis carrascoana. All isolated compounds showed higher antioxidant activity, while the extract of the stems showed strong AChE inhibition.
Michele Aparecida Besten*,I; Domingos Sávio NunesI; Daniel GranatoII; Sávio Luis SensII; Alberto Wisniewski JrIV; Edesio Luis SimionattoV; Dilamara Riva-ScharfV
This article presents the first GC-MS analyses of volatiles from galls induced by Baccharopelma dracunculifoliae and the results are compared with those from healthy Baccharis dracunculifolia leaf samples.
Luis H. Mendoza-Huizar*
The most reactive sites on picloram for electrophilic, free radical, and nucleophilic attacks have been determined.
Caroline D. Clasen; Meibel T. Lisboa; Ane Martiele T. P. Pinto; Anderson S. Ribeiro; Mariana A. Vieira*
Evaluation by atomic spectrometry of simple and fast solubilization methods for the determination of Ca, Mg, and K in glycerin samples obtained from biodiesel production.
Thalita G. Silva; Maiara O. Salles; Thiago R. L. C. Paixão*
The use of a glassy carbon electrode modified with ruthenium hexacyanoferrate was investigated. The aim was to detect procaine in abused drugs and pharmaceutical formulations.
Samira J. FayadI,*; Betina G. Z. RamosII; Valdir SoldiI; Edson MinattiI
Soy protein isolate nanoparticles were obtained through the coacervation of an aqueous protein solution. Morphology and stability analyses were followed by light scattering and microscopy analyses.
Emanoel Igor da Silva OliveiraI; Fernando SilveiraII; Adelaide Maria Vieira ViveirosI; Nara R. S. BassoIII; Zênis Novais da RochaI; João H. Z. dos SantosIV,*
Various types of polyethylene can only be obtained because of the possibility of modulating coordination compounds used as catalysts in the polymerization process. Both the metal center and the ligands can be tuned, giving versatility to such systems.
Osmando F. LopesI,II; Vagner R. de MendonçaII; Fernando B. F. SilvaI,II; Elaine C. ParisII; Caue RibeiroII,*
The following scheme depicts the application sequence of niobium oxide nanoparticles from an appropriate Nb source to heterogeneous photocatalysis. Aspects such as the morphology, band gap, and surface area are defined by the nanoparticles' synthetic parameters, which also influence the catalyst performance.
Juliana M. O. SouzaI; Maria F. H. CarneiroI; Ana Carolina C. PaulelliI; Denise GrottoII; Ariano M. Magalhães JúniorIII; Fernando Barbosa JúniorI; Bruno L. BatistaI,IV,*
Rice plants have the tendency to absorb different arsenic species. This cereal is a staple food for half of the global population. According to FAO/WHO, the arsenic level of rice is an increasing concern in food safety. Understanding the plant's mechanisms and monitoring its safety are imperative.
Marina Medeiros Machado; Marília Medeiros Machado; Ana Regina de Aguiar Dutra; Elisa Helena Siegel Moecke; Anelise Leal Vieira Cubas*
A cold plasma reactor was built with low-cost materials in order to degrade volatile organic compounds such as BTEX, known for their adverse effects on human health.
Sandro Pereira RibeiroI; Fernando Antonio Simas VazI; Marcone Augusto Leal de OliveiraI,*; Thiago de Oliveira MendesII; José Paulo Rodrigues Furtado de MendonçaII
This high pressurization device allows the capillary to be filled with a sol solution through either positive or negative (vacuum) pressure. The latter procedure averts contact between sol and the syringe thus avoiding damage.
Raphael Nagao; Melke A. Nascimento; Hamilton Varela*
An electrochemical setup for a multichannel data acquisition system was developed in order to obtain spatiotemporal resolution during the electrooxidation of small organic molecules.
Valéria C. Santos*; Agnaldo Arroio
This graphical abstract outlines the main elements of the research. The group represents a community of practice in chemistry teaching.
Ana Quílez-Díaz; Juan Quílez-Pardo*
The calculation (and the sign) of DrG establishes the direction of a chemical reaction. Q-K inequalities are accurate options. However, the use of the sign of Δ,Gº or Le Châtelier's principle leads to incorrect predictions.
Kauanna Naguissa Hino; Álvaro Takeo Omori*
A simple and low-cost procedure for preparation of aryl azides is described. Vinegar (renewable source) can be used as solvent/reagent.
Camila F. N. SilvaI; Fernando M. de SouzaI; Jéssica P. SantosI; Ana Paula B. DiasI; Ana Paula R. SantanaI; Angélica M. LazarinI,*; Rosana L. SernagliaI; Elza I. S. AndreottiI; Claudio AiroldiII
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