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453 results on '"Cardozo-Filho, Lúcio"'

9. In situ extraction/encapsulation of olive leaves antioxidants in zein for improved oxidative stability of edible oils

Author

Santos de Carvalho, Amarilis, de Oliveira, Anielle, Fernandes Moya Moreira, Thaysa, Gustavo Médice Arabel Costa, Luis, Donato Marcatto, Gabrielle, da Silva Castilhos de Melo, Andre, Hess Gonçalves, Odinei, Inês Dias, Maria, Calhelha, Ricardo C., Barros, Lillian, Valderrama, Patricia, Cardozo Filho, Lucio, and Vitória Leimann, Fernanda

Published
2023
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19. Equilibria Data for the CO2 + Ethanol + Ketoprofen Systems – Experimental and Modeling.

Author

Mattos, José Vinicius, Molina, Matías José, Rodriguez-Reartes, Sabrina Belén, Ferreira-Pinto, Leandro, Zabaloy, Marcelo Santiago, and Cardozo-Filho, Lúcio

Abstract

This study investigated the solid–fluid and vapor–liquid equilibrium of varying the molar fraction of ketoprofen in binary system (CO2 + ketoprofen), 3.14 × 10–5, 4.70 × 10–5 and 8.11 × 10–5, and the concentration of ketoprofen in ternary system (CO2 + ethanol + ketoprofen), 0.05073 and 0.10277 molKetoprofen·kgethanol−1, on a CO2-free basis for both systems. The aim was to study the solubility of ketoprofen at different molar fractions and predict its behavior over a wide range of temperatures and pressures by means of thermodynamic modeling. Experiments were conducted as a function of temperature from 313 to 333 K and pressure up to 14 MPa, using a visual synthetic static method with a variable volume cell. The collected data highlight an increase of the ketoprofen solubility with the temperature, while a ketoprofen content has a low impact on the bubble point pressure of the tested ternary system. Data were then correlated by using the thermodynamic modeling employed the Redlich–Kwong–Peng–Robinson equation of state (RK–PR EoS) with quadratic mixing rules for fluid phases and a pure solid model for ketoprofen. Then, a number of complete isopleths at set global composition were computed for the CO2 + ketoprofen binary system being indicated solid–fluid, solid–fluid–fluid, and fluid–fluid regions. The obtained results suggest that the thermodynamic models used in this work were able to describe the experimentally observed phase behavior. [ABSTRACT FROM AUTHOR]

Published
2025
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39. Ultra-Pressurized Deposition of Hydrophobic Chitosan Surface Coating on Wood for Fungal Resistance.

Author

Facchi, Suelen P., de Almeida, Débora A., Abrantes, Karen K. B., Rodrigues, Paula C. dos S., Tessmann, Dauri J., Bonafé, Elton G., da Silva, Marcelo F., Gashti, Mazeyar P., Martins, Alessandro F., and Cardozo-Filho, Lúcio

Subjects
ENERGY dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, WOOD, HYDROPHOBIC surfaces, CONTACT angle, ANTIFUNGAL agents
Abstract

Fungi (Neolentinus lepideus, Nl, and Trametes versicolor, Tv) impart wood rot, leading to economic and environmental issues. To overcome this issue, toxic chemicals are commonly employed for wood preservation, impacting the environment and human health. Surface coatings based on antimicrobial chitosan (CS) of high molar mass (145 × 105 Da) were tested as wood preservation agents using an innovative strategy involving ultra-pressurizing CS solutions to deposit organic coatings on wood samples. Before coating deposition, the antifungal activity of CS in diluted acetic acid (AcOOH) solutions was evaluated against the rot fungi models Neolentinus lepideus (Nl) and Trametes versicolor (Tv). CS effectively inhibited fungal growth, particularly in solutions with concentrations equal to or higher than 0.125 mg/mL. Wood samples (Eucalyptus sp. and Pinus sp.) were then coated with CS under ultra-pressurization at 70 bar. The polymeric coating deposition on wood was confirmed through X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray spectroscopy (EDS), scanning electron microscopy (SEM) images, and water contact angle measurements. Infrared spectroscopy (FTIR) spectra of the uncoated and coated samples suggested that CS does not penetrate the bulk of the wood samples due to its high molar mass but penetrates in the surface pores, leading to its impregnation in wood samples. Coated and uncoated wood samples were exposed to fungi (Tv and Nl) for 12 weeks. In vivo testing revealed that Tv and Nl fungi did not grow on wood samples coated with CS, whereas the fungi proliferated on uncoated samples. CS of high molar mass has film-forming properties, leading to a thin hydrophobic film on the wood surface (water contact angle of 118°). This effect is mainly attributed to the high molar mass of CS and the hydrogen bonding interactions established between CS chains and cellulose. This hydrophobic film prevents water interaction, resulting in a stable coating with insignificant leaching of CS after the stability test. The CS coating can offer a sustainable strategy to prevent wood degradation, overcoming the disadvantages of toxic chemicals often used as wood preservative agents. [ABSTRACT FROM AUTHOR]

Published
2024
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