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50 results on '"da Silva, Luis Henrique Mendes"'

1. Textile Azo Dye Removal Using a Quaternary Ammonium Anion Exchanger Prepared From Sugarcane Bagasse

Author

Tanure, Natália Roberta Marques, primary, Soares, Liliane Catone, additional, Maia, Luisa Cardoso, additional, Elias, Megg Madonyk Cota, additional, Xavier, Amália Luísa Pedrosa, additional, Adarme, Oscar Fernando Herrera, additional, Ferreira, Guilherme Max Dias, additional, de Azevedo, Eduardo Ribeiro, additional, da Silva, Luis Henrique Mendes, additional, and Gurgel, Leandro Vinícius Alves, additional

Published
2024
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13. Microcalorimetric and SAXS Determination of PEO-SDS Interactions: The Effect of Cosolutes Formed by Ions

Author

Barbosa, Aparecida Mageste, Santos, Igor José Boggione, Ferreira, Guilherme Max Dias, da Silva, Maria do Carmo Hespanhol, Teixeira, Alvaro Vianna Novaes de Carvalho, and da Silva, Luis Henrique Mendes

Subjects
Condensed Matter - Materials Science, Condensed Matter - Soft Condensed Matter, Physics - Chemical Physics
Abstract

The effect of different ionic cosolutes (NaCl, Na$_2$SO$_4$, Li$_2$SO$_4$, NaSCN, Na$_2$[Fe(CN)5NO], and Na$_3$[Co(NO)$_6$]) on the interaction between sodium dodecyl sulfate (SDS) and poly(ethylene oxide) (PEO) was examined by small-angle X-ray scattering (SAXS) and isothermal titration calorimetric techniques. The critical aggregation concentration values (cac), the saturation concentration ($C_2$), the integral enthalpy change for aggregate formation ($\Delta H_{\mbox{agg}}$(int)) and the standard free energy change of micelle adsorption on the macromolecule chain ( $\Delta\Delta G_{\mbox{agg}}$) were derived from the calorimetric titration curves. In the presence of 1.00 mmol L$^{-1}$ cosolute, no changes in the parameters were observed when compared with those obtained for SDS-PEO interactions in pure water. For NaCl, Na$_2$SO$_4$, Li$_2$SO$_4$, and NaSCN at 10.0 and 100 mmol L$^{-1}$, the cosolute presence lowered cac, increased $C_2$, and the PEO-SDS aggregate became more stable. In the presence of Na$_2$[Fe(CN)5NO], the calorimetric titration curves changed drastically, showing a possible reduction in the PEO-SDS degree of interaction, possibility disrupting the formed nanostructure; however, the SAXS data confirmed, independent of the small energy observed, the presence of aggregates adsorbed on the polymer chain., Comment: 8 pages, 8 figures

Published
2014
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32. Batch and continuous adsorption of Cu(II) and Zn(II) ions from aqueous solution on bi-functionalized sugarcane-based biosorbent

Author

Teodoro, Filipe Simões, primary, Soares, Liliane Catone, additional, Filgueiras, Jefferson Gonçalves, additional, de Azevedo, Eduardo Ribeiro, additional, Patiño-Agudelo, Álvaro Javier, additional, Adarme, Oscar Fernando Herrera, additional, da Silva, Luis Henrique Mendes, additional, and Gurgel, Leandro Vinícius Alves, additional

Published
2021
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33. Thermodynamic and kinetic insights into the interactions between functionalized CdTe quantum dots and human serum albumin: A surface plasmon resonance approach

Author

Aguiar, Cínthia das Dores, primary, Coelho, Yara Luiza, additional, de Paula, Hauster Maximiler Campos, additional, Santa Rosa, Lívia Neves, additional, Virtuoso, Luciano Sindra, additional, Mendes, Tiago Antônio de Oliveira, additional, Pires, Ana Clarissa dos Santos, additional, and da Silva, Luis Henrique Mendes, additional

Published
2021
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39. Synthesis and application of sugarcane bagasse cellulose mixed esters. Part I: Removal of Co2+ and Ni2+ from single spiked aqueous solutions in batch mode using sugarcane bagasse cellulose succinate phthalate

Author

Elias, Megg Madonyk Cota, primary, Ferreira, Gabriel Max Dias, additional, de Almeida, Francine Tatiane Rezende, additional, Rosa, Nathália Cristina Martins, additional, Silva, Isabela Almeida, additional, Filgueiras, Jefferson Gonçalves, additional, de Azevedo, Eduardo Ribeiro, additional, da Silva, Luis Henrique Mendes, additional, Melo, Tânia Márcia Sacramento, additional, Gil, Laurent Frédéric, additional, and Gurgel, Leandro Vinícius Alves, additional

Published
2019
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41. Modeling adsorption of copper(II), cobalt(II) and nickel(II) metal ions from aqueous solution onto a new carboxylated sugarcane bagasse. Part II: Optimization of monocomponent fixed-bed column adsorption

Author

Xavier, Amália Luísa Pedrosa, primary, Adarme, Oscar Fernando Herrera, additional, Furtado, Laís Milagres, additional, Ferreira, Gabriel Max Dias, additional, da Silva, Luis Henrique Mendes, additional, Gil, Laurent Frédéric, additional, and Gurgel, Leandro Vinícius Alves, additional

Published
2018
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43. Synthesis and application of a new carboxylated cellulose derivative. Part III: Removal of auramine-O and safranin-T from mono- and bi-component spiked aqueous solutions

Author

Teodoro, Filipe Simões, primary, Elias, Megg Madonyk Cota, additional, Ferreira, Gabriel Max Dias, additional, Adarme, Oscar Fernando Herrera, additional, Savedra, Ranylson Marcello Leal, additional, Siqueira, Melissa Fabíola, additional, da Silva, Luis Henrique Mendes, additional, Gil, Laurent Frédéric, additional, and Gurgel, Leandro Vinícius Alves, additional

Published
2018
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45. Synthesis and application of a new carboxylated cellulose derivative. Part I: Removal of Co 2+ , Cu 2+ and Ni 2+ from monocomponent spiked aqueous solution

Author

Teodoro, Filipe Simões, primary, Ramos, Stela Nhandeyara do Carmo, additional, Elias, Megg Madonyk Cota, additional, Mageste, Aparecida Barbosa, additional, Ferreira, Gabriel Max Dias, additional, da Silva, Luis Henrique Mendes, additional, Gil, Laurent Frédéric, additional, and Gurgel, Leandro Vinícius Alves, additional

Published
2016
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46. Effect of 1-Butyl-3-methylimidazolium Halide on the Relative Stability between Sodium Dodecyl Sulfate Micelles and Sodium Dodecyl Sulfate–Poly(ethylene oxide) Nanoaggregates

Author

Ferreira, Gabriel M. Dias, primary, Ferreira, Guilherme M. Dias, additional, Agudelo, Álvaro J. Patiño, additional, Hespanhol da Silva, Maria C., additional, Rezende, Jaqueline de Paula, additional, Pires, Ana Clarissa dos Santos, additional, and da Silva, Luis Henrique Mendes, additional

Published
2015
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47. ß-Carotene and Milk Protein Complexation: a Thermodynamic Approach and a Photo Stabilization Study.

Author

Ladeira Silva, Carla Eduarda, Acipreste Hudson, Eliara, Patiño Agudelo, Álvaro Javier, da Silva, Luis Henrique Mendes, Soares Pinto, Maximiliano, do Carmo Hespanhol, Maria, Ribeiro Barros, Frederico Augusto, and dos Santos Pires, Ana Clarissa

Subjects
MILK proteins, BIOACTIVE compounds, FLUORESCENCE spectroscopy, LUMINESCENCE spectroscopy, STOICHIOMETRY
Abstract

The demand for bioactive molecules, such as ß- carotene (ß-car), has increased, but some characteristics such as low water solubility and low photo stability limit its application in many formulations. The bioactive entrapment into milk proteins may overcome this barrier. Thus, the aim of this work was to study the interaction between ß-car and bovine serum albumin (BSA) or ß-casein and the photo stability of this bioactive in the presence of the proteins. Fluorescence spectroscopy showed that at pH 7.0, increasing concentrations of ß-carotene reduced the fluorescence intensity of both proteins, and the fluorescence-quenching mechanism is mainly static. The stoichiometry of the ß-car/protein complex varied between proteins, being 1:1 to native BSA, 1:3 to denatured BSA (d-BSA), and 1:2 for ß-casein. The standard Gibbs-free energy (ΔG°) of complex formation was negative for all systems studied and followed the order ΔG°BSA <ΔG°ß-casein <ΔG°d-BSA. The formation of ß-car/protein complex was driven by entropy increasing in all studied conditions. Both proteins improved ß-car photo stability, but ß-casein micelle was more efficient, reducing and increasing four times, respectively, the bioactive degradation constant and the halftime of ß-car. The overall results pointed to the strategic use of milk proteins, especially ß-casein micelles as nanovehicle for ß-car in food and other systems. [ABSTRACT FROM AUTHOR]

Published
2018
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48. Modification of Polysulfone Membrane Used in the Water Filtration Process to Reduce Biofouling

Author

Bernardes, Patricia Campos, primary, de Andrade, Nélio José, additional, da Silva, Luis Henrique Mendes, additional, de Carvalho, Antônio Fernandes, additional, Fernandes, Patrícia Érica, additional, Araújo, Emiliane Andrade, additional, Lelis, Carini Aparecida, additional, Mol, Paula Chequer Gouveia, additional, and de Sá, João Paulo Natalino, additional

Published
2014
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49. Partitioning of α-lactalbumin and β-lactoglobulin from cheese whey in aqueous two-phase systems containing poly (ethylene glycol) and sodium polyacrylate.

Author

Pereira Alcântara, Lizzy Ayra, Vieira Amaral, Isabella, Ferreira Bonomo, Renata Cristina, da Silva, Luis Henrique Mendes, do Carmo Hespanhol da Silva, Maria, Rodrigues Minim, Valéria Paula, and Minim, Luis Antonio

Subjects
*LACTALBUMIN, *LACTOGLOBULINS, *ETHYLENE glycol, *AQUEOUS solutions, *RESPONSE surfaces (Statistics)
Abstract

Partitioning behavior of the whey proteins a-lactalbumin (α-la) and β-lactoglobulin (β-lg) in aqueous two-phase systems prepared with poly ethylene glycol (PEG) and sodium polyacrilate (NaPA) was investigated as a function of pH and polymer concentrations. It was observed that α-la concentrated in the PEG phase while β-lg concentrated in the NaPA phase. Response surface methodology was applied to optimize protein partitioning and to achieve the best conditions for their fractionation. Thermodynamic analysis based on isothermal titration microcalorimetry indicated that the partitioning of α-la was accompanied by endothermic heat and was entropically driven, while β-lg partitioning was accompanied by exothermic heat and was enthalpically driven at low polymer concentrations and entropically driven at high polymer concentrations. Purification and yield parameters were determined using fresh whey and the results allowed for conclusion of the great applicability of this new system for α-la and β-lg fractionation. [ABSTRACT FROM AUTHOR]

Published
2014
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50. Synthesis and application of sugarcane bagasse cellulose mixed esters. Part I: Removal of Co 2+ and Ni 2+ from single spiked aqueous solutions in batch mode using sugarcane bagasse cellulose succinate phthalate.

Author

Elias MMC, Ferreira GMD, de Almeida FTR, Rosa NCM, Silva IA, Filgueiras JG, de Azevedo ER, da Silva LHM, Melo TMS, Gil LF, and Gurgel LVA

Subjects
Cobalt chemistry, Molecular Structure, Nickel chemistry, Particle Size, Phthalic Acids chemistry, Solutions, Succinates chemistry, Surface Properties, Water chemistry, Cellulose chemistry, Cobalt isolation & purification, Esters chemistry, Nickel isolation & purification, Saccharum chemistry
Abstract

Sugarcane bagasse cellulose mixed ester succinate phthalate (SBSPh) was synthesized by a novel one-pot reaction method. The effects of temperature, time and mole fraction of succinic anhydride (χ SA ) on the responses weight gain (wg), number of carboxylic acid groups (n T,COOH ), and adsorption capacity (q) of Co 2+ and Ni 2+ were evaluated by a 2 3 experimental design. The chemical structure of the material was elucidated by Fourier transform infrared, 13 C Multiple Cross-Polarization solid-state NMR spectroscopy and 1 H NMR relaxometry. The best SBSPh synthesis condition (100 °C, 11 h, χ SA of 0.2) yielded a wg of 59.1%, n T,COOH of 3.41 mmol g -1 , and values of q Co 2+ and q Ni 2+ of 0.348 and 0.346 mmol g -1 , respectively. The Sips model fitted better the equilibrium data, and the maximum adsorption capacities (pH 5.75 and 25 °C) estimated by this model were 0.62 and 0.53 mmol g -1 for Co 2+ and Ni 2+ , respectively. The Δ ads H° values estimated by isothermal titration calorimetry were 8.43 and 7.79 kJ mol -1 for Co 2+ and Ni 2+ , respectively. Desorption and re-adsorption efficiencies were evaluated by a 2 2 experimental design, which showed that SBSPh adsorbent can be recovered and reused without significant loss of adsorption capacity., (Copyright © 2018 Elsevier Inc. All rights reserved.)

Published
2019
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