RSS 1.0Artigos - Química - FC
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Investigation and characterization by TG/DTG–DTA and DSC of the fusion of Riboflavin, and its interaction with the antibiotic norfloxacin in the screening of cocrystal
Ferreira, Laura Teófilo
; Alarcon, Rafael Turra ; Perpétuo, Glauco Lini ; Bannach, Gilbert (Journal of Thermal Analysis and Calorimetry, 2018) [Artigo]
This work synthesized and characterized the NOR-RIB 1:1 (mol–mol) cocrystal. During a study of the reagents, Riboflavin (RIB) melted at 304 °C, which is different from the temperature previously reported in the literature ... -
Use of DSC in degree of conversion of dimethacrylate polymers: easier and faster than MIR technique
Alarcon, Rafael Turra; Gaglieri, Caroline ; de Oliveira, Arthur Rossi ; Bannach, Gilbert (Journal of Thermal Analysis and Calorimetry, 2018) [Artigo]
This work aims to determine the degree of conversion of polymers obtained using diurethane dimethacrylate (UDMA) monomer by two different techniques: differential scanning calorimetry (DSC) and Fourier transform infrared ... -
New thermal study of polymerization and degradation kinetics of methylene diphenyl diisocyanate
da Silva, José Eduardo Estevam; Alarcon, Rafael Turra ; Gaglieri, Caroline ; Magdalena, Aroldo Geraldo ; da Silva-Filho, Luiz Carlos ; Bannach, Gilbert (Journal of Thermal Analysis and Calorimetry, 2018) [Artigo]
This work investigates the thermal polymerization process of a methylene diphenyl diisocyanate (MDI) monomer as well as its thermal degradation following the ICTAC recommendations. MDI monomer is widely used as a synthetic ... -
Dimethacrylate polymers with different glycerol content: Thermal study, degree of conversion, and morphological features
Alarcon, Rafael Turra; Gaglieri, Caroline ; Bannach, Gilbert (Journal of Thermal Analysis and Calorimetry, 2018) [Artigo]
The objectives of this study were to verify thermal properties, degree of conversion, and morphological features of several dimethacrylate polymers with different glycerol content and obtain the better proportion system ... -
Synthesis and thermal study of polymers from soybean, sunflower, and grape seed maleinated oil
Alarcon, Rafael Turra; Vinícius de Almeida, Marcos ; Rinaldo, Daniel ; Bannach, Gilbert (European Journal of Lipid Science and Technology, 2017) [Artigo]
This paper presents the synthesis of some polymers from maleinated vegetable oils (soybean, sunflower, and grape seed) and glycerol. First, all the vegetable oils were previously maleinated with maleic anhydride, then, the ... -
Thermoanalytical study of sweetener myo-inositol: α and β polymorphs
Alarcon, Rafael Turra; Gaglieri, Caroline ; Caires, Flávio Junior ; Magdalena, Aroldo Geraldo ; ; Bannach, Gilbert (Food Chemistry, 2017) [Artigo]
This work investigates the thermal behavior of α and β myo-inositol polymorphs. The inositol is a natural compound widely used in the food industry due to its presence in carbohydrate metabolism and its sweet taste. The ... -
Induction of axial chirality in divanillin by interaction with bovine serum albumin
Venturini, Diego; De Souza, Aguinaldo Robinson ; ; ; Da Silva-Filho, Luiz Carlos ; Ximenes, Valdecir Farias (PLoS ONE, 2017) [Artigo]
Vanillin is a plant secondary metabolite and has numerous beneficial health applications. Divanillin is the homodimer of vanillin and used as a taste enhancer compound and also a promissory anticancer drug. Here, divanillin ... -
Dansylglycine, a fluorescent probe for specific determination of halogenating activity of myeloperoxidase and eosinophil peroxidase
Bertozo, Luiza de Carvalho; ; Ximenes, Valdecir Farias (Analytical Biochemistry, 2017) [Artigo]
Myeloperoxidase (MPO) and eosinophil peroxidase (EPO) are enzymes present in neutrophil and eosinophil leukocytes, respectively. Here, we present the development of a sensitive and specific assay for determination of the ... -
Microbicidal activity of N-chlorotaurine in combination with hydrogen peroxide
; Ximenes, Valdecir Farias; (AMB Express, 2017) [Artigo]
N-chlorotaurine (NCT) and hydrogen peroxide are powerful endogenous antiseptics. In vivo, the reaction between hydrogen peroxide and metal ions leads to the formation of free hydroxyl radicals, which have an increased ... -
New fluorescein dye derivatives and their use as an efficient photoiniator using blue light LED
Alarcon, Rafael Turra; Gaglieri, Caroline ; da Silva, Bruno Henrique Sacoman Torquato ; da Silva Filho, Luiz Carlos ; Bannach, Gilbert (Journal of Photochemistry and Photobiology A: Chemistry, 2017) [Artigo]
This work investigates the degree of conversion, thermal properties, and morphological features of polymers obtained using UDMA monomer and fluorescein and its derivatives dyes as photoinitiator. Photopolymerization has ... -
A combined approach using differential scanning calorimetry with polarized light thermomicroscopy in the investigation of ketoprofen and nicotinamide cocrystal
; ; Ferreira, L. T.; Fraga-Silva, T. F.C. ; Venturini, J. ; Arruda, M. S.P. ; Bannach, G. ; (Thermochimica Acta, 2017) [Artigo]
A screening of ketoprofen cocrystal with nicotinamide as a coformer was performed using the Kofler contact method and mechanochemistry. The crystallization of KET (with cocrystal formation) can occur during the heating ... -
Taurine bromamine: Reactivity of an endogenous and exogenous anti-inflammatory and antimicrobial amino acid derivative
Bertozo, Luiza De Carvalho; ; De Souza, Aguinaldo Robinson ; Ximenes, Valdecir Farias (Biomolecules, 2016) [Artigo]
Taurine bromamine (Tau-NHBr) is produced by the reaction between hypobromous acid (HOBr) and the amino acid taurine. There are increasing number of applications of Tau-NHBr as an anti-inflammatory and microbicidal drug for ... -
Use of curcumin and glycerol as an effective photoinitiating system in the polymerization of urethane dimethacrylate
; ; Alarcon, Rafael Turra; da Cunha Holanda, Bruno Barreto ; Bannach, Gilbert (Journal of Thermal Analysis and Calorimetry, 2017) [Artigo]
The objectives of this study were to verify the viability of the photoinitiating system using curcumin as a photoinitiator and glycerol as a coinitiator, to analyze the thermal and morphological features of the polymers ... -
Synthesis, characterization, thermal and spectroscopic studies and bioactivity of complexes of meloxicam with some bivalent transition metals
; ; Gaglieri, C.; Caires, F. J. ; Bannach, G. ; ; Treu-Filho, O. ; Ionashiro, M. ; (Journal of Thermal Analysis and Calorimetry, 2017) [Artigo]
Complexes of meloxicam with Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) were prepared by aqueous precipitation. The compounds were characterized by means of X-ray powder diffractometry, infrared spectroscopy, theoretical ... -
Polymorphism in propyl gallate recrystallized with acetone
Gálico, D. A.; Nova, C. V. ; Bannach, G. (Journal of Thermal Analysis and Calorimetry, 2017) [Artigo]
A new polymorphic form of the synthetic antioxidant propyl gallate was obtained by the recrystallization of the compound in acetone. The new form was characterized by thermogravimetry, differential scanning calorimetry, ... -
Evaluation of metal removal efficiency and its influence in the physicochemical parameters at two sewage treatment plants
; Magdalena, Aroldo G.; ; da Silva, Gustavo H. R. ; Piacenti-Silva, Marina (Environmental Monitoring and Assessment, 2018) [Artigo]
In sewage treatment plants, physicochemical parameters are highly controlled since treated sewage can be returned to water bodies or reused. In addition, pollutants such as heavy metals also deserve attention due to their ... -
Qualitative and Quantitative Analysis of Ethanolic Extract and Phenolic Fraction of Jatropha aethiopica (Euphorbiaceae) Leaves and Their Hypoglycemic Potential
Gamiotea-Turro, Daylin; Camaforte, Nathalia A.P. ; Valerino-Diaz, Alexander B. ; ; Rinaldo, Daniel ; Dokkedal, Anne L. ; Bosqueiro, José R. ; Santos, Lourdes Campaner Dos (Journal of Agricultural and Food Chemistry, 2018) [Artigo]
Although Jatropha aethiopica, popularly known in Cuba as mata diabetes, is used in salads and as a dietary supplement, its chemical composition and antidiabetic properties yet remains unclear. In this work, we evaluate the ... -
EDTA-functionalized Fe3O4 nanoparticles
Magdalena, A. G.; Silva, I. M.B. ; Marques, R. F.C. ; ; Lisboa-Filho, P. N. ; Jafelicci, M. (Journal of Physics and Chemistry of Solids, 2018) [Artigo]
This study analyzes the synthesis and characterization of functionalized Fe3O4 nanoparticles by ethylenediaminetetraacetic acid (EDTA). The syntheses were performed using the co-precipitation method under different ... -
Theoretical-Experimental Photophysical Investigations of the Solvent Effect on the Properties of Green- and Blue-Light-Emitting Quinoline Derivatives
dos Santos, Giovanny Carvalho; Servilha, Roberta Oliveira ; de Oliveira, Eliézer Fernando ; Lavarda, Francisco Carlos ; Ximenes, Valdecir Farias ; da Silva-Filho, Luiz Carlos (Journal of Fluorescence, 2017) [Artigo]
This paper describes the investigations on the solvatochromic effect and the photophysical properties of quinoline derivatives, compounds with potential applicability in optoelectronic devices. Using an experimental and ... -
Thermal behavior of glycolic acid, sodium glycolate and its compounds with some bivalent transition metal ions in the solid state
do Nascimento, A. L.C.S.; Teixeira, J. A. ; Nunes, W. D.G. ; ; Gaglieri, C. ; Treu-Filho, O. ; ; Caires, F. J. ; Ionashiro, M. (Journal of Thermal Analysis and Calorimetry, 2017) [Artigo]
Synthesis, characterization and thermal behavior of some transition metal glycolates, M(C2H3O3)2 [M = Mn(II), Co(II), Ni(II), Cu(II) and Zn(II)], as well as the thermal behavior of glycolic acid and its sodium salt (NaC2H3O3) ...