11 documents found, page 1 of 2
Immobilization of Streptavidin on a Plasmonic Au-TiO2 Thin Film towards an LSPR...
Pereira-Silva, Patrícia; Meira, Diana I.; Costa-Barbosa, Augusto; Costa, Diogo; Rodrigues, Marco S.; Borges, Joel; Machado, Ana V.; Cavaleiro, AlbanoOptical biosensors based on localized surface plasmon resonance (LSPR) are the future of label-free detection methods. This work reports the development of plasmonic thin films, containing Au nanoparticles dispersed in a TiO2 matrix, as platforms for LSPR biosensors. Post-deposition treatments were employed, namely annealing at 400 °C, to develop an LSPR band, and Ar plasma, to improve the sensitivity of the Au...
Immobilization of streptavidin on a plasmonic Au-TiO2 thin film towards an LSPR...
Pereira-Silva, Patrícia; Meira, Diana I.; Costa-Barbosa, Augusto; Costa, Diogo; Rodrigues, Marco S.; Borges, Joel; Machado, Ana V.; Cavaleiro, AlbanoOptical biosensors based on localized surface plasmon resonance (LSPR) are the future of label-free detection methods. This work reports the development of plasmonic thin films, containing Au nanoparticles dispersed in a TiO<sub>2</sub> matrix, as platforms for LSPR biosensors. Post-deposition treatments were employed, namely annealing at 400 °C, to develop an LSPR band, and Ar plasma, to improve the sensitivit...
Iridium(III)porphyrin arrays with tuneable photophysical properties
Castro, M. Cidália R.; Sedrine, Nabiha Ben; Monteiro, Teresa; Machado, Ana V.The photophysical properties of iridium(III) porphyrins complexes with two different axial ligands (Cl(CO) and bipyridine (bpy)) in solution and in cellulose acetate polymer matrix were investigated. The axial ligands substitution was made aiming to evaluate the photophysical properties and the solubility in different solvents. Therefore, dissimilar from the free porphyrin, non-polar solvents (as toluene) favou...
Preparation of poly(vinylidene fluoride) lithium-ion battery separators and the...
Costa, Carlos Miguel Silva; Rodrigues, Henrique Miguel Ribeiro; Gören, Attila; Machado, Ana V.; Silva, Maria M.; Lanceros-Méndez, S.Battery separator membranes for lithium-ion batteries have been developed based on poly(vinylidene fluoride), PVDF, and using the “green solvent” - N,N’-dimethylpropyleneurea (DMPU). This separator presents a porous microstructure with a degree of porosity of 20% and pore size below 1 µm, showing excellent mechanical properties. Further, its ionic conductivity, tortuosity and MacMullin number values are 0.1 mS....
The role of shear and stabilizer on PLA degradation
Oliveira, Manuel; Santos, Elsa; Araújo, Andreia; Fechine, Guilhermino J. M.; Machado, Ana V.; Botelho, GabrielaThe role of temperature, shear and oxygen on PLA degradation was investigated. Thermo-mechanical degradation induces a larger decrease in PLA molecular weight than thermo-oxidative degradation. This was associated with different degradation processes (mainly chain scission) that took place under the two conditions. Given the PLA robustness to endure reprocessing, it was possible to conclude that the primary and...
Recent Advances in Antioxidant Active Food Packaging
Sanches-Silva, Ana; Costa, Denise; Albuquerque, T.G.; Castilho, Maria Conceição; Ramos, Fernando; Machado, Ana V.; Costa, H.S.Recent Advances in Antioxidant Active Food Packaging: Food oxidation; Antioxidants; Food Packaging; Active Packaging; Legislation; Natural antioxidants.
Active Packaging: application of natural antioxidants
Sanches-Silva, Ana; Costa, Denise; Albuquerque, T.G.; Castilho, Maria Conceição; Ramos, Fernando; Machado, Ana V.; Costa, H.S.Natural antioxidants applied in Active food Packaging: Food oxidation; Antioxidants; Food Packaging; Active Packaging; Legislation; Natural antioxidants.
Potential contribution of common aromatic plants for vitamin C dietary intake
Carvalho-Costa, Denise; Albuquerque, T.G.; Costa, H.S.; Castilho, Maria Conceição; Ramos, Fernando; Machado, Ana V.; Sanches-Silva, AnaAromatic plants have been used in cooking and in folk medicine for centuries. However, in the last few years aromatic plants have received particular attention due to their simple and efficient contribution to decrease salt daily intake. The present study evaluated the two biologically active forms of vitamin C, L-ascorbic acid and dehydroascorbic acid, by high performance liquid chromatography coupled with dio...
Antioxidantes naturales aplicados a envases activos alimentarios: evolución rec...
Sanches-Silva, Ana; Costa, Denise; Albuquerque, T.G.; Castilho, Maria Conceição; Ramos, Fernando; Machado, Ana V.; Costa, H.S.Recent Advances in Antioxidant Active Food Packaging: Food oxidation; Antioxidants; Food Packaging; Active Packaging; Legislation; Natural antioxidants.
The potential of fresh versus dried aromatic herbs as source of antioxidant com...
Oliveira, Sofia; Costa, H.S.; Castilho, Maria Conceição; Ramos, Fernando; Carvalho Costa, Denise; Albuquerque, T.G.; Machado, Ana V.; Sanches-Silva, AnaIntroduction: Aromatic herbs have been used over the centuries, ubiquitously, with culinary or medicinal purposes. Nowadays they attract the interest of the scientific community due to their potential health benefits namely regarding oxidative processes in the body, such as age-related degenerative disorders and metabolic diseases, because herbs are considered a source of antioxidants. The use of antioxidants i...