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Nutrient accumulation in fruits and grains of black pepper at different ripenin...
Dalazen,Jéssica Rodrigues; Valani,Gustavo Pereira; Vieira,Henrique Duarte; Ramalho,José Cochicho; Lacerda Jr,Valdemar; Romão,WandersonABSTRACT: Nutrients accumulation in plants/fruits varies according to the crop development stage and its quantification is important to determine nutrients exportation for fertilization planning and nutrient balancing. This study determined the accumulation of nutrients in different parts of Piper nigrum ‘Bragantina’ spikes harvested at two ripening stages (still-green and red-colored spikes). Assessments in se...
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...
REDGIM COMO APLICATIVO DE SMARTPHONE PARA APLICAÇÕES QUIMIOMÉTRICAS POR MEIO DE...
Rosa,Thalles R.; Siqueira,Bruno M. M.; Costa,Rayana A.; Reis,Jadson Z. dos; Pacheco,Wagner L. S.; Moura,Paulo R. G. de; Romão,WandersonThe study of the spectrum of light has increased its range of action in the field of chemistry, with the help of several advanced equipment and innovative techniques that have become a strong ally of analytical chemistry. However, the simplicity of obtaining results integrated with mobile devices appears as an interesting path to be taken in the field of chemical analysis. This work addresses the dissemination ...
SYNTHESIS OF GLYCEROL-FLUORINATED TRIAZOLE DERIVATIVES AND EVALUATION OF THEIR ...
Barcelos,Fernando Fontes; Silva,Lucas Fagundes da; Gazolla,Poliana Aparecida Rodrigues; Teixeira,Róbson Ricardo; Queiroz,Vagner Tebaldi deThe control of fungal species in agriculture is mainly conducted with the use of contact or systemic fungicides. However, environmental and human health concerns and increased resistance of fungal species to existing fungicides have increased the pressure on researchers to find new active ingredients for fungal control which present low toxicity to non-target organisms, are environmentally safe, and can be appl...
Study of Inorganic Profiles of Street Cocaine Samples Using ICP-MS and ICP OES
Amorim,Zanata B.; Machado,Maiara P.; Moro,Mariana K.; Rebouças,Laura O.; Dalfior,Bruna M.; Romão,Wanderson; Filgueiras,Paulo RobertoDetermining inorganic constituents in illicit drugs can indicate its purity and presence of adulterants. In this study, we analyzed 52 street cocaine samples, seized in three different regions of Espírito Santo, state of Brazil. Inductively coupled plasma optical emission spectrometry was used to determine Al, Ca, Cu, Fe, Mn, Mg, Zn concentrations and inductively coupled plasma mass spectrometry to determine Mo...