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Physico-mechanical properties of chitosan films with carvacrol and grape seed e...
Rubilar, J. F.; Cruz, R .M. S.; Silva, Hélder D.; Vicente, A. A.; Khmelinskii, I.; Vieira, M. C.The physico-mechanical properties of 3 films composed by carvacrol, grape seed extract (GSE) and chitosan in different proportions were studied. The films, prepared by solvent casting technique with the following compositions of the casting solutions in carvacrol, GSE and chitosan: film-1: 9.6 ppm–684 ppm–1.25% w/v, film-2: 60 ppm–400 ppm–1.2% w/v and film-3: 90 ppm–160 ppm–1.24% w/v and were compared to a cont...
Continuous-flow precipitation of hydroxyapatite in ultrasonic microsystems
Castro, Filipa; Kuhn, Simon; Jensen, Klavs; Ferreira, António; Rocha, Fernando; Vicente, A. A.; Teixeira, J. A.This paper describes the continuous-flow precipitation of hydroxyapatite Ca5(PO4)3OH (HAp) in two ultrasonic microreactors using diluted aqueous solutions of calcium and phosphate at 37 °C. Precipitation of HAp was first carried out in a tubular microreactor immersed in an ultrasonic bath, where single-phase (laminar) flow and segmented gas-liquid flow were both evaluated. The single-phase flow study was then c...
Biorefinery valorization of autohydrolysis wheat straw hemicellulose to be appl...
Ruiz, Héctor A.; Cerqueira, M. A.; Silva, Hélder D.; Rodríguez-Jasso, Rosa María; Vicente, A. A.; Teixeira, J. A.The aims of this study were the extraction of hemicellulose from wheat straw (WS) and its utilization in the reinforcement of a κ-carrageenan/locust bean gum (κ-car/LBG) polymeric blend films (PBFs). WS hemicellulose extraction was performed under autohydrolysis process and hemicellulose extracted (HE) under optimum condition was used in PBFs. PBFs were prepared varying different proportions of HE into the κ-ca...
Inulin potential for encapsulation and controlled delivery of Oregano essential...
Costa, Sara Beirão da; Duarte, Cláudia; Bourbon, A. I.; Pinheiro, A. C.; Januário, M. Isabel N.; Vicente, A. A.; Costa, Maria Luísa Beirão daThe ability of inulin, a prebiotic material, as encapsulation matrix was explored. Microcapsules of Raftiline were produced by spray drying inulin solutions at different solids content (5, 15 and 25%) at 120, 155 and 190 °C, according to a Central Composite Rotatable design. Produced capsules were analysed for morphology and size by SEM and physiochemical characterized by DSC, IR and RAMAN. Oregano essential oi...
Utilization of galactomannan from Gleditsia triacanthos in polysaccharide-based...
Cerqueira, M. A.; Souza, B. W. S.; Teixeira, J. A.; Vicente, A. A.The objective of this work was to evaluate the effect of the concentrations of Gleditsia triacanthos galactomannan and glycerol and the presence of corn oil in the physical properties of edible films. The influence of interactions between those constituents on films' permeability to gases (water vapour, CO2 and O2), solubility in water, mechanical properties and colour was evaluated. The effects of those variab...
Effect of whey protein purity and glycerol content upon physical properties of ...
Ramos, Óscar L.; Reinas, Isabel; Silva, Sara I.; Fernandes, João C.; Cerqueira, M. A.; Pereira, Ricardo; Vicente, A. A.; Poças, M. FátimaThis manuscript describes the detailed characterization of edible films made from two different protein products e whey protein isolate (WPI) and whey protein concentrate (WPC), added with three levels of glycerol (Gly) e i.e. 40, 50 and 60%(w/w). The molecular structure, as well as barrier, tensile, thermal,surface and optical properties of said films were determined, in attempts to provide a better understand...
Optimization of CO2 bio-mitigation by Chlorella vulgaris
Anjos, Mariana; Fernandes, Bruno Daniel; Vicente, A. A.; Teixeira, J. A.; Dragone, GiulianoAbstract Biofixation of \CO2\ by microalgae has been recognized as an attractive approach to \CO2\ mitigation. The main objective of this work was to maximize the rate of \CO2\ fixation ( R \CO\ 2 ) by the green microalga Chlorella vulgaris \P12\ cultivated photoautotrophically in bubble column photobioreactors under different \CO2\ concentrations (ranging from 2% to 10%) and aeration rates (ranging from 0.1 to...
Hydrothermal processing, as an alternative for upgrading agriculture residues a...
Ruiz, Héctor A.; Rodríguez-Jasso, Rosa María; Fernandes, Bruno Daniel; Vicente, A. A.; Teixeira, J. A.The concept of a biorefinery that integrates processes and technologies for biomass conversion demands efficient utilization of all components. Hydrothermal processing is a potential clean technology to convert raw materials such as lignocellulosic materials and aquatic biomass into bioenergy and high added-value chemicals. In this technology, water at high temperatures and pressures is applied for hydrolysis, ...
Biocomposite films based on κ-carrageenan/locust bean gum blends and clays : ph...
Martins, Joana; Bourbon, A. I.; Pinheiro, A. C.; Souza, B. W. S.; Cerqueira, M. A.; Vicente, A. A.The aims of this work were to evaluate the physical and antimicrobial properties of biodegradable films composed of mixtures of κ-carrageenan (κ-car) and locust bean gum (LBG) when organically modified clay Cloisite 30B (C30B) was dispersed in the biopolymer matrix. Film-forming solutions were prepared by adding C30B (ranging from 0 to 16 wt.%) into the κ-car/LBG solution (40/60 wt.%) with 0.3 % (w/v) of glycer...
Effect of chitosan-based solutions applied as edible coatings and water glazing...
Soares, Nuno M.; Mendes, Tânia S.; Vicente, A. A.The aim of this research was to compare the effect of chitosan solutions on frozen salmon preservation with that of water glazing. For this purpose, three chitosan solutions (0.25%, 0.50% and 0.75% w/v) and water were applied in different amounts (6%, 8% and 11% of coated fillet weight) directly on the surface of frozen salmon. In order to accelerate the deterioration processes, salmon was stored during 14 week...
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