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Contribution of non-ionic interactions on bile salt sequestration by chitooligo...
Coreta-Gomes, Filipe Manuel; Silva, Inês M. V.; Nunes, Cláudia; Marin-Montesinos, Ildefonso; Evtuguin, Dmitry Victorovitch; Geraldes, Carlos F. G. C.Chitooligosaccharides have been suggested as cholesterol reducing ingredients mostly due to their ability to sequestrate bile salts. The nature of the chitooligosaccharides-bile salts binding is usually linked with the ionic interaction. However, at physiological intestinal pH range (6.4 to 7.4) and considering chitooligosaccharides pKa, they should be mostly uncharged. This highlights that other type of intera...
Contribution of non-ionic interactions on bile salt sequestration by chitooligo...
Coreta-Gomes, Filipe; Silva, Inês M.V.; Nunes, Cláudia; Marin-Montesinos, Ildefonso; Evtuguin, Dmitry; Geraldes, Carlos F.G.C.; João Moreno, MariaChitooligosaccharides have been suggested as cholesterol reducing ingredients mostly due to their ability to sequestrate bile salts. The nature of the chitooligosaccharides-bile salts binding is usually linked with the ionic interaction. However, at physiological intestinal pH range (6.4 to 7.4) and considering chitooligosaccharides pKa, they should be mostly uncharged. This highlights that other type of intera...
Exploring Molecular Dynamics of Adsorbed CO2 Species in Amine-Modified Porous S...
Fonseca, Rita; Vieira, Ricardo; Sardo, Mariana; Marin-Montesinos, Ildefonso; Mafra, LuísPrevious studies on CO2 adsorbents have mainly addressed the identification and quantification of adsorbed CO2 species in amine-modified porous materials. Investigation of molecular motion of CO2 species in confinement has not been explored in depth yet. This work entails a comprehensive study of molecular dynamics of the different CO2 species chemi- and physisorbed at amine-modified silica materials through th...
“Hidden” CO2 in amine-modified porous silicas enables full quantitative NMR ide...
Vieira, Ricardo; Marin-Montesinos, Ildefonso; Pereira, João; Fonseca, Rita; Ilkaeva, Marina; Sardo, Mariana; Mafra, LuísAlthough spectroscopic investigation of surface chemisorbed CO2 species has been the focus of most studies, identifying different domains of weakly interacting (physisorbed) CO2 molecules in confined spaces is less trivial as they are often indistinguishable resorting to (isotropic) NMR chemical shift or vibrational band analyses. Herein, we undertake for the first time a thorough solid-state NMR analysis of CO...