9 documents found, page 1 of 1
Magneto-plasmonic bionanocomposites for on-site SERS detection of water contami...
Soares, Sofia F.; Silva, Nuno M. A. S.; Brenheiro, João; Fateixa, Sara; Daniel-da-Silva, Ana L.; Trindade, TitoMagneto-plasmonic nanosystems have emerged as important multifunctional structures for several sensing applications, including on-site water quality monitoring. In this scenario, these nanosystems can integrate magnetic assisted separation procedures associated with optical detection of water contaminants, by exploring the surface-enhanced Raman scattering effect (SERS). Among the several modalities proposed fo...
Towards efficient ciprofloxacin adsorption using magnetic hybrid nanoparticles ...
Soares, Sofia F.; Nogueira, João; Trindade, Tito; Daniel-da-Silva, Ana L.The efficient removal of the antibiotic ciprofloxacin (CIP) from aqueous samples using magnetic nanosorbents prepared using three sulfated polysaccharides, κ-, ι- and λ-carrageenan and an alkoxysilane agent containing a reactive epoxide ring is described. The prepared nanosorbents were characterized in detail using FTIR spectroscopy, solid-state 29Si and 13C NMR spectroscopy and elemental microanalysis. The syn...
A versatile synthetic route towards gelatin-silica hybrids and magnetic composi...
Soares, Sofia F.; Fateixa, Sara; Trindade, Tito; Daniel-da-Silva, Ana L.We report a versatile synthetic route for the preparation of nearly monodispersed spherical gelatin-silica hybrid nanoparticles. These hybrids have been synthesized by means of a non-emulsion sol–gel method involving the base-catalyzed hydrolysis and condensation of gelatin modified with different functional coupling agents. The method is effective for preparing hybrids of both gelatin type A and B, and the alk...
Recovery of immunoglobulin G from rabbit serum using k-carrageenan-modified hyb...
Magalhães, Flávia F.; Almeida, Mafalda R.; Soares, Sofia F.; Trindade, Tito; Freire, Mara G.; Daniel-da-Silva, Ana Luísa; Tavares, Ana P. M.Immunoglobulin G (IgG) has been used in the treatment of cancer, autoimmune diseases and neurological disorders, however, the current technologies to purify and recover IgG from biological media are of high-cost and time-consuming, resulting in high-cost products. In this sense, the search for cost-effective technologies to obtain highly pure and active IgG is highly required. The present work proposes a simple...
Recovery of immunoglobulin G from rabbit serum using κ-carrageenan-modified hyb...
Magalhães, Flávia F.; Almeida, Mafalda R.; Soares, Sofia F.; Trindade, Tito; Freire, Mara G.; Daniel-da-Silva, Ana Luísa; Tavares, Ana P. M.Immunoglobulin G (IgG) has been used in the treatment of cancer, autoimmune diseases and neurological disorders, however, the current technologies to purify and recover IgG from biological media are of high-cost and time-consuming, resulting in high-cost products. In this sense, the search for cost-effective technologies to obtain highly pure and active IgG is highly required. The present work proposes a simple...
Effects of long-term exposure to colloidal gold nanorods on freshwater microalgae
Monteiro, Cátia; Daniel-da-Silva, Ana L.; Venâncio, Cátia; Soares, Sofia F.; Soares, Amadeu M. V. M.; Trindade, Tito; Lopes, IsabelGold nanorods have shown to pose adverse effects to biota. Whether these effects may be potentiated through prolonged exposure has been rarely studied. Therefore, this work aimed at evaluating the effects of long-term exposure to sublethal levels of cetyltrimethylammonium bromide (CTAB) coated gold nanorods (Au-NR) on two freshwater microalgae: Chlorella vulgaris and Raphidocelis subcapitata. These algae were e...
An ionic liquid route to prepare copper sulphide nanocrystals aiming at photoca...
Estrada, Ana C.; Silva, Fabio M.; Soares, Sofia F.; Coutinho, Joao A. P.; Trindade, TitoCopper sulphide crystallizes in a variety of phases that exhibit distinct optical properties including different optical band gaps in the visible region. The crystalline phases are associated with unique properties shown by semiconductor nanocrystals that could be exploited to produce new photocatalysts with tuned optical behavior. This research reports on the use of ionic liquids as a reaction medium to produc...
Hybrid nanoadsorbents for the magnetically assisted removal of metoprolol from ...
Soares, Sofia F.; Simoes, Tania R.; Antonio, Maria; Trindade, Tito; Daniel-da-Silva, Ana L.Metoprolol (MTP) is known as one of the most frequently detected beta blockers in surface waters, with potentially harmful impact on environment and human health due to its widespread use and resistance to hydrolysis. The removal of MTP in wastewater treatment plants is still very low due to fairly ineffective conventional water treatment procedures and, therefore, more efficient treatments are needed. To tackl...
Carrageenan-Silica Hybrid Nanoparticles Prepared by a Non-Emulsion Method
Soares, Sofia F.; Trindade, Tito; Daniel-da-Silva, Ana L.Spherical and monodispersed sub-micrometer sized particles of organic-inorganic hybrids were prepared by means of a sol-gel non-emulsion method using the biopolymer kappa-carrageenan and the alkoxysilane 3-isocyanatopropyltriethoxysilane (ICPTES). The structural characterization of the carrageenan-silica hybrid particles was performed by using FTIR spectroscopy and solid-state Si-29 and C-13 NMR spectroscopy an...