51 documents found, page 1 of 6
A greener route to prepare PEBAX®1074 membranes for gas separation processes
Ortiz-Albo, Paloma; Delgado Alves, Vitor; Kumakiri, Izumi; Crespo, Joao; Neves, Luísa A.The solvent used in membrane fabrication is crucial for a potential industrial application, with a direct effect on its safety, environmental and economic impact. Thus, in the last years, the search for greener and safer solvents became of utmost importance aiming for a sustainable fabrication of highly performing membranes, since that also affects the final membrane morphology. Typically, solvent evaporation-b...
Effect of olive pomace extract application and packaging material on the preser...
Madureira, Joana; Melgar, Bruno; Delgado Alves, Vitor; Moldão, Margarida; Margaça, Fernanda M. A.; Santos-Buelga, Celestino; Barros, LillianThe efficiency of natural olive pomace extracts for enhancing the quality of fresh-cut appleswas compared with commercial ascorbic acid and two different packaging films (biodegradable polylactic acid (PLA) and oriented polypropylene (OPP)) were tested. The composition of atmosphere inside the packages, the physicochemical parameters (firmness, weight loss and color), the microbial load, total phenolic content ...
Novel Hydrogel Membranes Based on the Bacterial Polysaccharide FucoPol: Design,...
Araújo, Diana; Martins, Matilde; Concórdio-Reis, Patrícia; Roma-Rodrigues, Catarina; Morais, Maria; Delgado Alves, Vitor; Fernandes, AlexandraFucoPol, a fucose-rich polyanionic polysaccharide, was used for the first time for the preparation of hydrogel membranes (HMs) using Fe3+ as a crosslinking agent. This study evaluated the impact of Fe3+ and FucoPol concentrations on the HMs’ strength. The results show that, above 1.5 g/L, Fe3+ concentration had a limited influence on the HMs’ strength, and varying the FucoPol concentration had a more significan...
Recovery and purification of cutin from Tomato by-products for application in h...
Simões, Andreia; Coelhoso, Isabel M.; Delgado Alves, Vitor; Brazinha, CarlaTomato pomace is a low-cost, renewable resource that has been studied for the extraction of the biopolyester cutin, which is mainly composed of long-chain hydroxy fatty acids. These are excellent building blocks to produce new hydrophobic biopolymers. In this work, the monomers of cutin were extracted and isolated from tomato pomace and utilized to produce cutin-based films. Several strategies for the depolymer...
Impact of Ionic Liquid Structure and Loading on Gas Sorption and Permeation for...
Ortiz-Albo, Paloma; Ferreira, Tiago J.; Martins, Carla F.; Delgado Alves, Vitor; Esteves, Isabel A.A.C.; Cunha-Silva, Luís; Kumakiri, IzumiCarbon dioxide (CO2) capture has become of great importance for industrial processes due to the adverse environmental effects of gas emissions. Mixed matrix membranes (MMMs) have been studied as an alternative to traditional technologies, especially due to their potential to overcome the practical limitations of conventional polymeric and inorganic membranes. In this work, the effect of using different ionic li...
Chitin-Glucan Complex Hydrogels: Optimization of Gel Formation and Demonstratio...
Araújo, Diana; Rodrigues, Thomas; Delgado Alves, Vitor; Freitas, FilomenaChitin-glucan complex (CGC) hydrogels were fabricated through a freeze–thaw procedure for biopolymer dissolution in NaOH 5 mol/L, followed by a dialysis step to promote gelation. Compared to a previously reported methodology that included four freeze–thaw cycles, reducing the number of cycles to one had no significant impact on the hydrogels’ formation, as well as reducing the total freezing time from 48 to 18 ...
Application of an Eco-Friendly Antifungal Active Package to Extend the Shelf Li...
Vieira, Tiago M.; Delgado Alves, Vitor; Moldão, MargaridaThe main objective of this study was to extend the shelf life of fresh red raspberry (Rubus idaeus. L. cv. ‘Kweli’) by using active film-pads inside commercial compostable packages. The pads were produced with chitosan (Ch) with the incorporation of green tea (GTE) and rosemary (RSME) ethanolic extracts as natural antifungal agents. Pads were placed on the bottom of commercial fruit trays underneath the fruits,...
Tackling Humidity with Designer Ionic Liquid-Based Gas Sensing Soft Materials
Esteves, C.; Palma, S.I.C.J.; Costa, H.M.A.; Alves, C.; Santos, G.M.C.; Ramou, E.; Carvalho, A.L.; Delgado Alves, Vitor; Roque, A.C.A.Relative humidity is simultaneously a sensing target and a contaminant in gas and volatile organic compound (VOC) sensing systems, where strategies to control humidity interference are required. An unmet challenge is the creation of gas-sensitive materials where the response to humidity is controlled by the material itself. Here, humidity effects are controlled through the design of gelatin formulations in ioni...
Membrane Technology for Valorization of Mango Peel Extracts
Macedo, Antónia; Gomes, Tânia; Ribeiro, Carlos; Moldão, Margarida; Duarte, Elizabeth; Delgado Alves, VitorMango peel is rich in nutritional and functional compounds, such as carbohydrates, dietary fibers, proteins, and phenolic compounds, with high potential to be applied in the food industry. Most of the investigation about recovery of bioactive compounds from fruit bioproducts involves extraction techniques and further separation of target compounds. There is still a lack of information about the potential of mem...
Deacetylation and Desuccinylation of the Fucose-Rich Polysaccharide Fucopol: Im...
Baptista, Sílvia; Araújo, Diana; Concórdio-Reis, Patrícia; Marques, Ana C.; Fortunato, Elvira; Delgado Alves, Vitor; Freitas, FilomenaFucoPol is an acylated polysaccharide with demonstrated valuable functional properties that include a shear thinning fluid behaviour, a film-forming capacity, and an emulsion forming and stabilizing capacity. In this study, the different conditions (concentration, temperature, and time) for alkaline treatment were investigated to deacylate FucoPol. Complete deacetylation and desuccinylation was achieved with 0....