Entraremos em recesso a partir do dia 23/12/15 e retornaremos às atividades normais no dia 04/01/16. Todas as correspondências recebidas durante esse período serão processadas a partir de 04/01/16.
Núbia Boechat; Angelo da Cunha Pinto; Mônica Macedo Bastos
Selective C-F formations: fluorine transfer by nucleophilic, electrophilic, and enzymatic methods. The most common fluorination reagents and a fluorinase.
Gecílio P. Silva; Andarair G. Santos; Ricardo de S. Cunha; Paulo S. G. Silva; José A. M. Oliveira
The Hull cell is a trapezoidal structure in which the cathode forms an oblique angle with respect to the anode. The change in the angles of the electrodes changes the distances between them and gives rise to a gradient along the cathode.
Reginaldo B. dos Santos; Álvaro Cunha Neto; Elizeu de Souza M. Junior; Valdemar Lacerda Jr.; Sandro J. Greco; Júlia de Almeida Leite; Bruna B. de Faria; Igor Simões A. Felippe
A novel epoxy-carbaldehyde cyclopentane monoterpenoid with contiguous asymmetric centers, acting as a starting material for the synthesis of plinol, was synthesized from (R)-(+)-limonene oxide.
Erandir Brasil da Silva; Antoninho Valentini
Methylene blue degradation under N2 flow is higher than under air or CO2 flow. The Ca2Fe2O5 phase reacts with CO2 in an aqueous system. After the photocatalytic process, no Ca2Fe2O5 phase was observed in any system.
Daniele Oshita; Isabel C. S. F. Jardim
This study compares chromatographic techniques for the determination of pesticide multiresidues in strawberries. The application of pesticides causes great concern owing to food safety and environmental protection issues, in addition to affecting the requirements for export licenses.
Thiago Belarmino de Souza; Ana Carolina Oliveira Bretas; Ricardo José Alves; Thais Furtado Ferreira Magalhães; Maria Aparecida Resende Stoianoff
This work describes the synthesis and anti-Candida activity of a series of new palmitic acid-based neoglycolipides related to fungicidal Papulacandin D.
Iara Lisboa de Matos; Samísia Maria Fernandes Machado; Adauto Ribeiro de Souza; Emmanoel Vilaça Costa; Angelita Nepel; Andersson Barison; Péricles Barreto Alves
Ketones were determined to be predominant in the essential oil and hydrolates of Campomanesia viatoris Landrum. Tasmonone was isolated and its structure was characterized by 1D and 2D Nuclear Magnetic Resonance (NMR) spectrometry and mass spectrometry (MS) analyse.
Wei Wei; Yong jun Lv; Shi jun Shao; Yong Guo
Receptor 5 on an N-(indol-3-ylglyoxylyl)benzylamine hydrazine hydrate derivative can selectively distinguish F− from AcO−, H2PO4−, and other anions by a favorable color change from colorless to yellow in DMSO-H2O binary solutions.
A novel rhodamine-based compound 1 containing a quinoline group was reported as an "off-on" fluorescent probe for Fe3+. A novel analytical method based on Euclidean distance was utilized to investigate the fluorescence response of 1 to Fe3+.
Luiz H. de Oliveira; Lauro A. Pradela Filho; André L. Santos; Regina M. Takeuchi; Magno A. G. Trindade
The deconvolution and second-order derivative of square wave voltammograms were used to achieve separation of the voltammetric peaks of levofloxacin (LEVO) and norfloxacin (NOR), for their simultaneous quantification in urine samples.
Michele C. Reis; Flavio A. Freitas; Elizabeth R. Lachter; Rosane A. S. San Gil; Regina S.V. Nascimento; Rodrigo L. Poubel; Leandro B. Borré
A maximum production of ester was achieved from fatty acids obtained by refining coconut and soybean oils. Microwave irradiation reduced the reaction time from 6 to 1 hour.
Boaz G. Oliveira
Theoretical methods of electronic structure play a significant role in unveiling the hydrogen bond properties from structural data, vibration modes, or electronic profiles.
Luciano Segné F. Silva; Douglas S. Bibiano; Monique Kort-Kamp Figueiredo; Rodrigo P. B. Costa-Félix
This figure discloses graphically the thresholds for detection (based on the probability of 0.95) and quantification (probability of 0.99) when using the proposed ultrasonic method for the analytical task of evaluating the content of oils and greases mixed in water.
Rubens R. Teles; José A. A. França; Armando Navarro-Vázquez; Fernando Hallwass
This report describes the application of anisotropic nuclear magnetic resonance parameters, including residual dipolar coupling (RDC), for the determination of the relative configuration of α-santonin. The RDCs were also successfully employed for the assignment of prochiral methylene at C5, which was not previously known.
Francisco Geraldo Barbosa; Jair Mafezoli; Mary Anne Sousa Lima; Francisco Serra Oliveira Alexandre; Diego Macedo de Almeida; Antonio José Melo Leite Junior; José Nunes da Silva Júnior
A free educational software was designed in English and Portuguese, implemented and evaluated by professors and students. It was characterized as an auxiliary tool to assist professors in their lectures and students in their learning process of intermolecular forces.
Gabriela G. Sonai; Maurício A. Melo Jr.; Julia H. B. Nunes; Jackson D. Megiatto Jr.; Ana F. Nogueira
Dye-sensitized solar cells were prepared by undergraduate students in a teaching laboratory as an approach to the concepts related to the development of an alternative renewable and environmentally friendly energy source.
Roberto Vaz; Kayo O. Vieira; Cláudia E. Machado; Jefferson L. Ferrari; Marco A. Schiavon
In this study, carbon dots were obtained through pyrolysis under an inert atmosphere using commercial colorless gelatin as a low cost precursor. The optical properties of carbon dots such as ultraviolet-visible absorption and emission properties make them a promising material.
Johanna Camacho Gonzalez; Alvaro Muñoz-Castro
A historiographical study of Jane Marcet's role in spreading chemistry knowledge to a wider audience in the 19th century is presented.
On-line version ISSN 1678-7064 Printed version ISSN 0100-4042
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