27 documents found, page 1 of 3
Microencapsulation of Essential Oils and Oleoresins: Applications in Food Products
Fernandes, Beatriz; Oliveira, M. Conceição; Marques, Ana C.; Santos, Rui Galhano dos; Serrano, CarmoEssential oils (EOs) and oleoresins (ORs) are plant-derived extracts that contain both volatile and non-volatile compounds used for flavoring, coloring, and preservation. In the food industry, they are increasingly used to replace synthetic additives, aligning with consumer demand for natural ingredients, by substituting artificial flavors, colorants, and preservatives. Microcapsules can be added to a vast rang...
Development of Composites of PLA Filled with Different Amounts of Rice Husk Fib...
Pereira, Daniel F.; Branco, A. C.; Cláudio, R.; Marques, Ana C.; Figueiredo-Pina, CélioPolylactic acid (PLA) has been used as a matrix material to produce compo- sites with natural fibers, which present several advantages, being one of them the addition of value to agricultural waste. Thus, this study aims to develop a PLA 3D filament with the incorporation of a waste agriculture product (rice husk (RH)). For that, RH fibers were prepared, and PLA was loaded up to 20% RH. The filaments were obtai...
Passive direct methanol fuel cells acting as fully autonomous electrochemical b...
Silva Ferreira, Nadia; Carneiro, Liliana P.T; Viezzer, Christian; Almeida, Maria J.T.; Marques, Ana C.; Pinto, Alexandra M.F.R.; Fortunato, ElviraThis work describes an innovative electrochemical biosensor that advances its autonomy toward an equipment-free design. The biosensor is powered by a passive direct methanol fuel cell (DMFC) and signals the response via an electrochromic display. Briefly, the anode side of the DMFC power source was modified with a biosensor layer developed using molecularly imprinted polymer (MIP) technology to detect sarcosine...
Edible films to improve quality and shelf life of fresh tortillas
Serrano, Carmo; Santos, Rafael; Viegas, Cláudia; Sapata, M. Margarida; Santos, R. Galhano dos; Condeço, J. A.; Marques, Ana C.; Bordado, J. C.Edible films have emerged as packaging aids to replace synthetic polymers due to their biodegradable nature. The aim of this study was to develop starch-based edible films for application in packaging, to inhibit moisture transfer from the filling to the tortilla, while maintaining physicochemical and organoleptic quality characteristics, and improving shelf life. Twenty-four types of filmogenic solutions were ...
Water peel-off transfer of electronically enhanced, paper-based laser-induced g...
Pinheiro, Tomás; Correia, Ricardo; Morais, Maria; Coelho, João; Fortunato, Elvira; Sales, M. G. F.; Marques, Ana C.; Martins, RodrigoLaser-induced graphene (LIG) has gained preponderance in recent years, as a very attractive material for the fabrication and patterning of graphitic structures and electrodes, for multiple applications in electronics. Typically, polymeric substrates, such as polyimide, have been used as precursor materials, but other organic, more sustainable, and accessible precursor materials have emerged as viable alternativ...
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....
Characterisation of Films Based on Exopolysaccharides from Alteromonas Strains ...
Concórdio-Reis, Patrícia; Pereira, João R.; Delgado Alves, Vitor; Nabais, Ana R.; Neves, Luísa A.; Marques, Ana C.; Fortunato, Elvira; Moppert, XavierThis work assessed the film-forming capacity of exopolysaccharides (EPS) produced by six Alteromonas strains recently isolated from different marine environments in French Polynesia atolls. The films were transparent and resulted in small colour alterations when applied over a coloured surface (ΔEab below 12.6 in the five different colours tested). Moreover, scanning electron microscopy showed that the EPS film...
Auto de alçamento de D. Sebastião (1557)
Marques, Ana C.1557, Lisboa, junho, 15 D. João III nomeia D. Catarina como regente do reino, tutora e curadora de D. Sebastião até à sua maioridade e o Cardeal D. Henrique como seu adjunto.; 15 June 1557, Lisbon King João III appoints D. Catarina as regent of the kingdom, tutor and curator of King Sebastião until he came of age, and Cardinal Henrique as her aide.
Development of polycarbonate urethane-based materials with controlled diclofena...
Oliveira, Andreia S.; Ferreira, Inês; Branco, Ana C.; Silva, João C.; Costa, Carolina; Nolasco, Pedro; Marques, Ana C.; Silva, Diana; Colaço, Rogérioydrogels are very promising human cartilage replacement materials since they are able to mimic its structure and properties. Besides, they can be used as platforms for drug delivery to reduce inflammatory postsurgical reactions. Polycarbonate urethane (PCU) has been used in orthopedic applications due to its long-term biocompatibility and bio-durability. In this work, PCU-based hydrogels with the ability to rel...
Laser-induced graphene on paper toward efficient fabrication of flexible, plana...
Pinheiro, Tomás; Silvestre, Sara; Coelho, João; Marques, Ana C.; Martins, Rodrigo; Sales, M. Goreti F.; Fortunato, ElviraAbstract Laser irradiation to induce networks of graphene-based structures toward cost-effective, flexible device fabrication is a highly pursued area, with applications in various polymeric substrates. This work reports the application of this approach toward commonly available, eco-friendly, low-cost substrates, namely, chromatographic and office papers. Through an appropriate chemical treatment with sodium t...