25 documents found, page 1 of 3
New Europium(III)-TTA Complex Containing 2-Pyrrolidone as Coligand to Applicati...
Macrino,Clebson J.; Borges,Alex S.; Cunha Neto,Álvaro; Lacerda Jr.,Valdemar; Romão,WandersonThis work describes the synthesis and application of an europium(III) complex, [Eu(TTA)3(2-pyr) (H2O)], containing 2-thenoyltrifuoroacetonate (TTA) and 2-pyrrolidone (2-pyr) as ligands, obtained as white solid and soluble in ethanol. In solution, the complex showed red emission, characteristic of the EuIII emission in the solid state (λexc = 375 nm and λem = 612 nm). The complex was tested with PbII, CdII, and ...
Use of a Portable Microscope Combined with a Smartphone to Determine the Authen...
Costa,Rayana A.; Vittorazzi,Bruno V.; Barbosa,Amanda P.; Rocha,Victória B. da; Brandão,Jandira M. O. B.; Lacerda Jr.,Valdemar; Filgueiras,Paulo R.This study proposed using a portable microscope combined with a smartphone and application (PhotoMetrix® application) to evaluate the authenticity of Brazilian banknotes (R$50 and R$100) and national driver’s licenses (NDL) through image acquisition (Samsung S7) and chemometric treatment (principal component analysis (PCA)). Six regions of the banknote were analyzed: holographic band; lower and upper tactile re...
Synthesis of Eugenol-Fluorinated Triazole Derivatives and Evaluation of Their F...
Lima,Ângela M. A.; Paula,Wenderson T. de; Leite,Iris C. H. L.; Gazolla,Poliana A. R.; Abreu,Lucas M. de; Fonseca,Victor R.; Romão,WandersonEugenol (C10H12O2, 4-allyl-2-methoxyphenol) is a phenolic natural product that has several biological activities and possibilities of applications. It is herein described the synthesis of eugenol-fluorinated triazole derivatives and evaluation of their fungicidal activity. The reaction of eugenol with epichlorohydrin resulted in the preparation of (±)-2-((4-allyl-2-methoxyphenoxy)methyl)oxirane (1) in 88% yield...
Infravermelho portátil na região do próximo (NIR) aplicado no controle de quali...
Correia,Radigya M.; Cunha,Pedro H.; Agnoletti,Bárbara Z.; Pereira,Lucas L.; Partelli,Fábio L.; Filgueiras,Paulo R.; Lacerda Jr.,ValdemarThe objective of this work was to control the purity level of canephora coffees (Conilon coffee) from the state of Espírito Santo (Brazil), as a function of the addition of grounds produced by the coffees themselves using a portable microspectrometer in the infrared region. (microNIR), associated with chemometric tools. The PCA model grouped the coffees according to the level of adulterant in the samples and sh...
Comparando o desempenho de dois analisadores de massas (FT-ICR MS & LTQ MS)...
Lyrio,Marcos V. V.; Feu,Amanda E.; Motta,Larissa C.; Figueroa,Laura P. R.; Boasquevisque,Leonardo; Pinto,Roberta T.; Rosa,Ana Caroline L.Mass spectrometry (MS) is a high-performance analytical technique that allows a measurement of the mass/charge (m/z) ratio of compounds present in a sample. MS is able to separate two m/z ions with determined values (mass resolution), being an important characteristic, especially in the analysis of biochemical components and complex mixtures. Mass analyzers define the resolving power and accuracy of different t...
ESTUDO DO PERFIL QUÍMICO DE CERVEJAS BRASILEIRAS: UMA AVALIAÇÃO ENTRE AS BEBIDA...
Coelho Neto,Dorval M.; Moreira,Laysa L. P. F.; Castro,Eustáquio V. R. de; Souza,Warley B.; Filgueiras,Paulo R.; Romão,Wanderson; Folli,Gabriely S.Beer is commonly produced with four inputs: water, malt, hops, yeast and, in some cases, brewing adjuncts. Industrial and artisanal processes essentially follow the same steps and may undergo minor changes due to the style of beer. Despite this, many consumers attribute higher quality to craft beer compared to industrial ones. In this study, we applied the analytical techniques of infrared (IR), hydrogen nuclea...
Synthesis, Characterization, and Application of Europium(III) Complexes as Lumi...
Macrino,Clebson J.; Silva,Elias M.; Cunha,Victor R.; Fonseca,Victor R.; Cunha Neto,Álvaro; Araújo,Joyce R.; Lacerda Jr.,Valdemar; Romão,WandersonIn this work, three complexes were synthesized from the trivalent europium ion (EuIII), using the picrate anion (pic), and delta-valerolactam (DVL), epsilon-caprolactam (EPK), and oenantholactam (OEN). The synthesized complexes [Eu(pic)3·(DVL)3], [Eu(pic)3·(EPK)3], and [Eu(pic)3·(OEN)3] were studied as luminescent markers for application as security elements in Brazilian banknotes. All complexes showed red colo...
SÍNTESE DE NOVOS 1,2,3-TRIAZÓIS INSPIRADOS NO SRPIN340 E AVALIAÇÃO DE SEUS EFEI...
Sousa,Sara Maria Ribeiro de; Teixeira,Róbson Ricardo; Costa,Adilson Vidal; Aguiar,Alex Ramos de; Fonseca,Victor da Rocha; Lacerda Jr.,ValdemarIt is herein described the synthesis of a series of thirty novel 1,2,3-triazole-1,4 disubstituted compounds inspired on the known SRPKs inhibitor N-(2-(piperidin-1-yl)-5-(trifluoromethyl)phenyl)isonicotinamide (SRPIN340) and biological evaluation of them against human glioblastoma multiforme cell line U87MG. Starting with 1-fluoro-2 nitro-4-(trifluoromethyl)benzene (1), the substances were prepared via a five-s...
Identifying New Isatin Derivatives with GSK-3β Inhibition Capacity through Mole...
Britto,Karolinni B.; Francisco,Carla S.; Ferreira,Débora; Borges,Bárbara J. P.; Conti,Raphael; Profeti,Demetrius; Rodrigues,Ligia R.The semi-synthesis of 11 isatin derivatives was achieved through bimolecular nucleophilic substitution and click chemistry. Seven new compounds were obtained. All chemical structures were determined by infrared spectroscopy (IR), nuclear magnetic resonance spectrometry (NMR) and high-resolution mass spectrometry (HRMS) data. These derivatives were evaluated for their anti-GSK-3b activity and all isatin derivati...
Synthesis of New Phenolic-Schiff Base and Its Application as Antioxidant in Soy...
Martins,Lucas F.; Cubides-Román,Diana C.; Silveira,Vivian C. da; Aquije,Glória M. F. V.; Romão,Wanderson; Santos,Reginaldo B. dos; Cunha Neto,ÁlvaroNew Schiff base compound N, N’-bis-(4-hexadecanate)-salicylethylenediamine (named IM) was synthesized, and characterized via infrared and nuclear magnetic ressonance spectroscopies. IM was tested as corrosion inhibitor and antioxidant in soybean biodiesel. Corrosion studies were developed with AISI 1020 carbon steel in a three-step accelerated corrosion assay and IM inhibitory activity was evaluated using micro...