Encontrados 21 documentos, a visualizar página 1 de 3
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...
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...
Development of nanostructures for application in food technology : evaluation o...
Pinheiro, A. C.Tese de doutoramento in Chemical and Biological Engineering ; The emerging field of nanotechnology offers new challenges to the food industry either by offering novel tools for the development of strategies to improve food quality and human health, or by the introduction of questions about the behaviour of nanostructures within the human body. Nanotechnology holds a great potential to generate very innovative ...
Transport mechanism of macromolecules on hydrophilic bio-polymeric matrices : d...
Pinheiro, A. C.; Bourbon, A. I.; Vicente, A. A.; Quintas, Mafalda A. C.The transport mechanism of protein-based bioactive compounds (a peptide fraction from whey protein concentrate, glycomacropeptide and lactoferrin), from chitosan films to liquid medium, was studied. Mathematical models were used to discuss the transport mechanism. Data from release experiments was successfully described by a model which accounts for both Fick and Case II transport – the linear superimposition m...
Unravelling the behaviour of curcumin nanoemulsions during in vitro digestion: ...
Pinheiro, A. C.; Lad, M.; Silva, Hélder D.; Coimbra, Manuel A.; Boland, M.; Vicente, A. A.Oil-in-water nanoemulsions containing curcumin were prepared through high-pressure homogenization using corn oil and three different emulsifiers: Tween 20 (non-ionic), Sodium Dodecyl Sulphate (SDS, anionic) and DodecylTrimethylAmmonium Bromide (DTAB, cationic). A human gastric simulator was used as the in vitro digestion model (in which the stomach, duodenum, jejunum and ileum steps were performed) to evaluate ...
Interactions between K-carrageenan and chitosan in nanolayered coatings - Struc...
Pinheiro, A. C.; Bourbon, A. I.; Medeiros, Bartolomeu G. de S.; Silva, Luis Henrique Mendes da; Silva, Maria do Carmo Hespanhol daThe interactions between -carrageenan and chitosan, two oppositely charged polysaccharides, have been investigated through microcalorimetric and quartz crystal microbalance measurements. Microcalorimetric measurements show that -carrageenan/chitosan interaction is an exothermic process and that the alternate deposition of -carrageenan and chitosan results in the formation of a nanolayered coating mainly due ...
Κ-carrageenan/chitosan nanolayered coating for controlled release of a model bi...
Pinheiro, A. C.; Bourbon, A. I.; Quintas, Mafalda A. C.; Coimbra, Manuel A.; Vicente, A. A.Multilayer nanocoatings composed of κ-carrageenan, a sulphated anionic polysaccharide, and chitosan, a cationic polysaccharide, were produced by layer-by-layer deposition. The model cationic compound Methylene Blue (MB) was incorporated in different positions of the nanolayered coating and its loading and release behavior was evaluated. UV–VIS spectroscopy and quartz crystal microbalance analysis showed that th...
Synergistic effects between κ-carrageenan and locust bean gum on physicochemica...
Martins, Joana; Cerqueira, M. A.; Bourbon, A. I.; Pinheiro, A. C.; Souza, B. W. S.; Vicente, A. A.The development of mixed systems, formed by locustbeangum (LBG), and κ-carrageenan (κ-car) can offer new interesting applications such as the development of ediblefilms with particular properties. κ-car/LBG blend films with different ratios were developed, and their effects on films’ physical properties were assessed. Thermogravimetric analysis (TGA), X-ray diffraction (XRD) patterns, dynamic mechanical analysi...
Chemical characterization and antioxidant activity of sulfated polysaccharide f...
Souza, B. W. S.; Cerqueira, M. A.; Bourbon, A. I.; Pinheiro, A. C.; Martins, Joana; Teixeira, J. A.; Coimbra, Manuel A.; Vicente, A. A.Hydrocolloids from seaweeds have interesting functional properties, such as antioxidant activity and gelling ability. A polysaccharide was isolated by aqueous extraction at 90 C from the red seaweed Gracilaria birdiae (Gb), with a yield of 27.2% of the seaweed dry weight. The sulfate content of the polysaccharide was 8.4% and the main sugars present were galactose (65.4 mol%), 3,6-anhydrogalactose (25.1 mol%) a...
Effect of the matrix system in the delivery and in vitro bioactivity of microen...
Costa, Sara Beirão da; Duarte, Cláudia; Bourbon, A. I.; Pinheiro, A. C.; Serra, Ana Teresa; Martins, Margarida Moldão; Januário, Maria Isabel NunesThe effect of encapsulating matrix on retention, protection and delivery of Oregano essential oil (EO) was studied. EO was encapsulated in rice starch porous spheres, inulin and gelatine/sucrose capsules by spray drying. Gelatine/sucrose matrix was also dried by freeze drying. Experimental designs were applied to test the effect of bonding agents and solids content for rice starch and drying temperature and sol...
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