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...
Fabiano Vargas PereiraI,*; Everton Luiz de PaulaI; João Paulo de MesquitaII; Alessandra de Almeida LucasIII; Valdir ManoIV
An alternative to improve the properties of biodegradable polymers is the development of nanocomposites using biodegradable nanoparticles obtained from renewable resources.
Tamiris V. B. FigueiredoI,*; Márcio I. CamposII; Luciane S. SousaI; Jaff R. da SilvaI; Janice I. DruzianI
The schematic representation is a possible chemical composition of PHAs produced by fermentation of GBRB in shake flasks (35 °C, 72 h, 180 rpm) by Cupriavidus necator IPT 026.
Ricardo Bortoletto-SantosI; Caue RibeiroII,*
Herbicide release was shown to be dependent on medium pH: in release tests using different pHs, medium acidification accelerated release and tablet deformation according to acid strength.
Marcelo R. de AmorimI; Daniel RinaldoII; Fabiano P. do AmaralIII; Wagner VilegasIII; Mara A. G. MagentaIV; Gerardo M. Vieira JrV; Lourdes C. dos SantosI,*
This article describes the development of a HPLC-DAD based method for the isolation, identification, and quantification of three flavonoids in the hydroethanolic extract of the aerial parts of Tonina fluviatilis and evaluation of their radical scavenging activity by a DPPH based assay.
Yunus Emre UnsalI; Mustafa TuzenI; Mustafa SoylakII,*
A dispersive liquid-liquid microextraction procedure coupled to spectrophotometry is described for the determination of the trace levels of Sudan Blue II.
Antônio O. de SouzaI,*; Valdecir BiondoI; Paulo Willian C. SarvezukI; Jusmar V. BelliniI; Pedro R. AnizelliII; Dimas A. M. ZaiaII; Andrea Paesano JrI
X-ray diffraction (refined with the program FullProf / routine Le Bail) for iron(III) 57 acetate, formula [57Fe3O (CH3COO)6 (H2O)3]CH3COO or Ac57Fe, showed that the space group that best refines the X-ray diffraction pattern of the compound is C2/c.
Gustavo Luiz ParaginskiI,*; Claiton Roberto BerticelliI; Priscilla Jussiani ZambiaziI; Vanessa Teixeira Kunz ParaginskiI; Manfredo HörnerI; Aline Joana Rolina Wohlmuth Alves dos SantosII; Rosmari HörnerIII,#
Six diaryltriazene compounds bearing different substituent groups were tested for antibacterial activity and toxicity toward Artemia salina. MIC results were good to very good, in the range 8 to 128 µg mL-1. Toxicity was about 10-fold lower than DTIC for three compounds.
Cristiane de Melo CazalI,*; Moacir Rossi ForimII; Maria Fátima G. Fernandes da SilvaII; Paulo Cezar VieiraII; João Batista FernandesII
A rapid analytical method using HPLC for the quantification of xanthyletin content in biodegradable polymeric nanoparticles has been developed and validated.
Thiago L. de AlmeidaI; Josiane A. MonteiroI; Greice K. P. LopesI; Lucas U. R. ChiavelliI; Silvana M. de O. SantinI; Cleuza C. da SilvaI; Vanessa KaplumII; Débora B. ScariotII; Celso V. NakamuraII; Ana L. T. G. RuizIII; João E. CarvalhoIII; Ricardo T. de FariaIV; Armando M. PominiI,*
Chemical study of the orchid Maxillaria picta allowed the isolation of the bioactive stilbenes phoyunbene B and phoyunbene C, which were evaluated for anticancer activity against human tumor cell lines and against evolutionary forms of T. cruzi and L. amazonensis.
Jéssica Aparecida SerafimI; Renata AfonsoI; Adriana Campano LucilhaI; Lucas Agostinho de OliveiraI; Paulo Rogério Catarini da SilvaII; Marcelo Rodrigues da SilvaIII; Elen Romão SartoriI; Luiz Henrique Dall'AntoniaI;*
Bismuth vanadate, a semiconductor, when irradiated with visible light promotes discoloration of dyes leading to a decrease in their concentration as a function of irradiation time.
Renan A. P. Ribeiro; Sergio R. de Lázaro*
Density functional theory B3LYP investigations of the pressure-induced phase transition of PbTiO3 material revealed that the transition state of this process displayed a tetragonal symmetry, and spontaneous polarizations changed under pressure.
Fabrício Ribeiro de Souza; Gerson Francisco Duarte Junior; Paulo de Tarso Garcia; Wendell Karlos Tomazelli Coltro*
This report describes a study about the feasibility of using a conventional digital camera, a cell-phone camera, an optical microscope, and a scanner as digital image capture devices for colorimetric measurements in laser-printed microzones on transparency films.
Andrew Milli Elias; Filipe Arantes Furtado; Gerson Luiz Vieira Coelho*
Schematic representation of a closed system containing a liquid phase, a gaseous phase, and fiber-coating phase. SPME is a technique for extraction and concentration of analytes for posterior analysis on analytical equipment such as GC or HPLC.
Ahad Bavili TabriziI,II,*; Sana NainiIII; Kosar ParnianIII; Samin MohammadiIII; Fayeze Emami zadIII; Samira Pourtaghi AnvarianIII; Ali AbdollahiII
Cloud point extraction combined with spectrofluorimetric detection was used to extract and determine triamterene in human urine samples, and was found to be a promising method for monitoring drugs for pharmaceutical and clinical purposes.
Maria das Graças Bichara Zoghbi*; Raimunda Alves Pereira; Giselle do Socorro Luz de Lima; Maria de Nazaré do Carmo Bastos
Leaves and branches of Tapirira guianensis (Anacardiaceae) afforded three different types of oils: I) β-selinene/α-selinene, II) (E)-caryophyllene, and III) β-sesquiphellandrene/α-zingiberene. This is the first report on the volatiles of this tree.
Roselena S. Schuh#; Fernanda Bruxel#; Helder F. Teixeira*,#
Nanoemulsions stabilized by rapeseed or sunflower lecithins demonstrated similar physicochemical properties to the egg lecithin-based formulations obtained by spontaneous emulsification or high-pressure homogenization procedures.
Rafaela Maciel RebeloI; Eloisa Dutra CaldasII,*
The environmental fate of pesticides depends on its physical-chemical properties, application method, soil characteristics and climate. The pesticide can reach the ground water and contaminate river and lakes, affecting the living organisms.
2H-MoS2 having a layered structure is able to be exfoliated through several chemical or physical methods and the obtained single layers can be used in several branches of science and technology.
Caroline Werner Pereira da Silva Grandizoli#; Francinete Ramos Campos#; Fabio Simonelli#; Andersson Barison*,#
Grape Juice Quality Control by Means of 1H NMR Spectroscopy and Chemometric Analyses.
Wilson F. Jardim*
Marcius A. UllmannI; Wilhelm M. WallauI; Daniela BianchiniI,*; Andressa da C. SchneidII; Lara M. P. MontenegroI
Would you like to make serpent eggs which vivify? These eggs are basically comprised of sugar and sodium bicarbonate. In the past, mercuric thiocyanate was used for this experiment and its decomposition had generated ash very more times longer than the eggs. Interesting, yet toxic.
Jaqueline R. Maluta#,*
The physical alterations in poorly stored drugs represented in the picture were the framework by which several questions were raised. Thus, undergraduate students have to connect all the information, and investigate and test their hypotheses to solve the problem.
Maria Fernanda Campos Mendonça*; Márcia Regina Cordeiro; Keila Bossolani Kiill
This work proposes the use of the modified V diagram as a report in practical classes of general chemistry to assist students in establishing relationships between theoretical/conceptual and methodological knowledge concerning objects and/or events studied.
Eduardo F. Sousa-AguiarI; João M. A. R. de AlmeidaII; Pedro N. RomanoII,*; Rodrigo P. FernandesII; Yuri CarvalhoII
The topic "Green Chemistry" has gained great importance over recent years, being quoted in an increasing number of publications. This fact shows how concern over developing "greener" processes has played a prominent role in the scientific community.
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