Search Results - "Calado, António R."

Gemini Surfactant−Protein Interactions: Effect of pH, Temperature, and Surfactant Stereochemistry by Faustino, Célia M. C, Calado, António R. T, Garcia-Rio, Luís

“…The interactions between bovine serum albumin (BSA) and gemini surfactants derived from cystine have been investigated and were compared with the conventional…”
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New Urea-Based Surfactants Derived from α,ω-Amino Acids by Faustino, Célia M. C, Calado, António R. T, Garcia-Rio, Luís

“…New anionic urea-based surfactants derived from α,ω-amino acids and in particular from β-alanine were synthesized and their solution properties characterized…”
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Enzymatic Synthesis of the Flavone Glucosides, Prunin and Isoquercetin, and the Aglycones, Naringenin and Quercetin, with Selective α-L-Rhamnosidase and β-D-Glucosidase Activities of Naringinase by Vila-Real, Hélder, Alfaia, António J., Bronze, M. Rosário, Calado, António R. T., Ribeiro, Maria H. L.

“…The production of flavonoid glycosides by removing rhamnose from rutinosides can be accomplished through enzymatic catalysis. Naringinase is an enzyme complex,…”
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Mixed Micelle Formation between an Amino Acid-Based Anionic Gemini Surfactant and Bile Salts by Faustino, Célia M. C, Serafim, Cláudia S, Ferreira, Inês N, Branco, Mafalda A, Calado, António R. T, Garcia-Rio, Luis

“…The mixed micelle formation in basic aqueous solutions between an anionic gemini amino acid-based surfactant derived from cysteine (C8Cys)2 and the bile salts…”
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Unusual Solvent Effect on a SN2 Reaction. A Quantum-Mechanical and Kinetic Study of the Menshutkin Reaction between 2-Amino-1-methylbenzimidazole and Iodomethane in the Gas Phase and in Acetonitrile by Melo, André, Alfaia, António J. I, Reis, João Carlos R, Calado, António R. T

“…The quaternization reaction between 2-amino-1-methylbenzimidazole and iodomethane was investigated in the gas phase and in liquid acetonitrile. Both…”
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Mixed micelle formation between amino acid-based surfactants and phospholipids by Faustino, Célia M.C., Calado, António R.T., Garcia-Rio, Luís

“…Amino acid-based gemini surfactant (C8Cys)2 and single-chain surfactant C8Cys form mixed micelles with the phospholipids DHPC and DMPC, as a result of the…”
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Dimeric and monomeric surfactants derived from sulfur-containing amino acids by Faustino, Célia M.C., Calado, António R.T., Garcia-Rio, Luís

“…Dimeric ( 1) and monomeric ( 2a– c) urea surfactants derived from sulfur-containing amino acids form micelles in aqueous solution where the micellar parameters…”
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α-Rhamnosidase and β-glucosidase expressed by naringinase immobilized on new ionic liquid sol–gel matrices: Activity and stability studies by Vila-Real, Helder, Alfaia, António J., Rosa, João N., Gois, Pedro M.P., Rosa, M. Emilia, Calado, António R.T., Ribeiro, Maria H.

“…Novel ionic liquid (IL) sol–gel materials development, for enzyme immobilization, was the goal of this work. The deglycosylation of natural glycosides were…”
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Interactions between β-cyclodextrin and an amino acid-based anionic gemini surfactant derived from cysteine by Faustino, Célia M.C., Calado, António R.T., Garcia-Rio, Luís

“…[Display omitted] ► Anionic gemini surfactant derived from the amino acid cysteine forms a 1:1 inclusion complex with β-cyclodextrin. ► The binding constant is…”
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An innovative sol–gel naringinase bioencapsulation process for glycosides hydrolysis by Vila-Real, Helder, Alfaia, António J., Rosa, M. Emília, Calado, António R., Ribeiro, Maria H.L.

“…In this work, a biocatalytic system was chosen to enable the deglycosylation of natural glycosides in order to improve their biological activity. Naringinase,…”
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Pressure-enhanced activity and stability of α- l-rhamnosidase and β- d-glucosidase activities expressed by naringinase by Vila-Real, Helder, Alfaia, António J., Phillips, Robert S., Calado, António R., Ribeiro, Maria H.L.

“…Naringinase is an enzyme complex, expressing α- l-rhamnosidase and β- d-glucosidase activities. The impact of high pressure and temperature on naringinase…”
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Improvement of activity and stability of soluble and sol–gel immobilized naringinase in co-solvent systems by Vila-Real, Helder, Alfaia, António J., Calado, António R., Ribeiro, Maria H.L.

“…The hydrolysis of naringin, a bitter flavonone glycoside, with naringinase leads to reducing sugars (rhamnose and glucose), to prunin and to the aglycone,…”
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High pressure: a tool to improve the enzymatic production of glycosides by Vila-Real, Helder, Alfaia, António J., Calado, António R., Phillips, Robert S., Ribeiro, Maria H.L.

“…Naringinase, an enzyme complex that expresses α -l-rhamnosidase and β -d-glucosidase activities in native state, can be used to deglycosylate natural…”
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High pressure-temperature effects on enzymatic activity: Naringin bioconversion by Vila Real, Helder J., Alfaia, António J., Calado, António R.T., Ribeiro, Maria H.L.

“…Initially exploited in chemistry and physics, high-pressure technology has gained importance in various fields. Flavonoids, namely naringin and naringenin,…”
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α-Rhamnosidase and β-glucosidase expressed by naringinase immobilized on new ionic liquid sol-gel matrices: Activity and stability studies : Towards sustainable biotechnology by VILA-REAL, Helder, ALFAIA, António J, ROSA, João N, GOIS, Pedro M. P, ROSA, M. Emilia, CALADO, António R. T, RIBEIRO, Maria H

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Design of diglycerylsilane microcapsules for sol–gel bioencapsulation of naringinase: Activity and stability studies by Vila-Real, Helder, Alfaia, António J., Calado, António R., Ribeiro, Maria H.L.

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High pressure studies on hesperitin production with hesperidinase free and immobilized in calcium alginate beads by Furtado, Andreia, Rosário, Pedro M., Calado, António R.T., Alfaia, António J.I., Ribeiro, Maria H.L.

“…The use of high pressure for the enzymatic synthesis of pharmacologically interesting molecules is a very important tool. Hesperidin and hesperitin exhibit…”
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Unusual Solvent Effect on a S N 2 Reaction. A Quantum-Mechanical and Kinetic Study of the Menshutkin Reaction between 2-Amino-1-methylbenzimidazole and Iodomethane in the Gas Phase and in Acetonitrile by Melo, André, Alfaia, António J. I., Reis, João Carlos R., Calado, António R. T.

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Quaternization Reaction of Aromatic Heterocyclic Imines in Methanol − A Case of Strong Anti-Reactivity Selectivity Principle with Isoselective Temperature by Alfaia, António J. I., Calado, António R. T., Reis, João Carlos R.

“…Accurate second‐order rate constants were measured at 5 °C intervals in the temperature range 20−60 °C for the Menshutkin reaction of 1‐methylbenzimidazole,…”
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Shape effects in the partial molar volume of tetraethylphosphonium and ammonium iodides in six nonaqueous solvents by PINHEIRO, Lidia M. V, CALADO, Antonio R. T, REIS, Joao Carlos R, VIANA, César A. N

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