Encontrados 52 documentos, a visualizar página 1 de 6
Partial molar volumes of glycine and L-Alanine in aqueous MgSO4 solutions betwe...
Mota, Carolina C.; Ferreira, Olga; Pinho, SimãoIn this work, partial molar volumes of glycine and L-alanine in aqueous solutions of magnesium sulphate at (0.0, 0.1, 0.3, 0.7 and 1.0) molal were obtained between 278.15 K and 308.15 K. Additionally, partial molar volumes of transfer at infinite dilution and hydration numbers were calculated. In general, transfer volumes are higher for glycine then L-alanine. From the transfer volumes, it can be concluded that...
Multilocal programming and applications
Pereira, Ana I.; Ferreira, Olga; Pinho, Simão; Fernandes, Edite M.G.P.Multilocal programming aims to identify all local maximizers of unconstrained or constrained nonlinear optimization problems. The multilocal programming theory relies on global optimization strategies combined with simple ideas that are inspired in deflection or stretching techniques to avoid convergence to the already detected local maximizers. The most used methods to solve this type of problems are based on ...
Partial molar volumes of amino acids in aqueous solutions of magnesium chloride
Ferreira, Olga; Javornik, Ema; Pinho, SimãoThe lack of a deep molecular picture of the interactions which govern the biochemetry of vital processes is steel one critical issue in this area, which limits the development of pharmaceutical solutions for diseases induced by biochemical disorders [1]and the improvement of the efficiency of biotechnological processes [2].
Effect of KCl and (NH4)2SO4 on the solubility of four amino acids in water at 2...
Ferreira, Olga; Silva, Carina; Pinho, SimãoAmino acids (AA)are very important biomolecules, not only for their intrinsic pharmaceutical value, but also, as the building blocks of proteins. The study of their solubility in aqueous electrolyte solutions can therefore be useful for the design of the separation processees and, be related to protein chemistry, providing an important insight into the interactions present in those complex solutions.
Destilação extrativa: aplicação de agentes de separação não-voláteis
Parente, Bruno; Ferreira, Olga; Pinho, SimãoNo intuito de contribuir para um melhor conhecimento dos processos de destilação extrativa recorrend o a solutos não - voláteis, n este trabalho é analisad o o efeito da adição de sais e líquidos iónicos no equilíbrio líquido - vapor de algumas misturas importantes na indú stria química, tais como etanol + água, 1 - propanol + água, 2 - propanol + água, acetona + metanol, acetato de metilo + metanol e clorofórm...
Physico-chemical property prediction and environmental fate modelling of N-acyl...
Schröder, B.; Martins, M.A.R.; Pinho, Simão; Coutinho, J.A.P.(Subcooled) vapour pressures, aqueous solubilities, Henry constants, log KOW and log KOC partition constants have been estimated for a set of N-acyl-chalcogenourea derivatives using several prediction methods (COSMO-RS in its COSMOtherm implementation, SPARC as well as EPA’s EPIsuite). The data are discussed in terms of substituent effects: how do subtle changes in the chemical composition influence basic physi...
Solubility of hesperetin in mixed solvents
Ferreira, Olga; Schroeder, B.; Coutinho, J.A.P.; Pinho, SimãoThe study of the solubility of tlavonoids is essential to support the design of several separation processes in the food and pharmaceutical industries. Hesperetin is a flavanone with great importance for its promising biological and pharmacological properties.
Partial molar volumes of amino acids in aqueous solutions of magnesium chloride
Ferreira, Olga; Javornik, E.; Pinho, SimãoThe lack of a deep molecular picture of the interactions which govern the biochemistry of vital processes is still one critical issue in this area, which limits the development of pharmaceutical solutions for diseases induced by biochemical disorders [1] and the improvement of the efficiency of biotechnological processes [2]. In this concern the study of protein-electrolyte interactions is of most importance. H...
Effect of KCl and (NH4)2SO4 on the solubility of four amino acids in water at 2...
Ferreira, Olga; Silva, C.S.M.; Pinho, SimãoAmino acids (AA) are very important biomolecules, not only for their intrinsic pharmaceutical value, but also, as the building blocks of proteins. The study of their sol ubility in aqueous electrolyte solutions can therefore be useful for the design of separation processes and, also, be related to protein chemistry, providing an important insight into the interactions present in those complex solutions. Previou...
Isobaric vapor−liquid equilibrium data for binary system of glycerol ethyl acet...
Constantino, D.S.M.; Pereira, C.S.M.; Pinho, Simão; Silva, V.M.T.M.; Rodrigues, A.E.Isobaric vapor−liquid equilibrium (VLE) data for the binary mixture of glycerol ethyl acetal (GEA) and acetonitrile were measured at 60.0 kPa and 97.8 kPa, using a dynamic recirculating still. The VLE data were correlated using the nonrandom two-liquid (NRTL) and universal quasichemical activity coefficient (UNIQUAC) models, and the interaction parameters of this mixture were estimated. The experimental procedu...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||