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• W2023144212 abstract "The interactions of l-alanine with γ- and α-alumina have been investigated by diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). l-Alanine/alumina samples were dried from aqueous suspensions, at 36.5 °C, with two amino acid concentrations (0.4 and 0.8 mmol g-1) and at different pH values (1, 6, and 13). The vibrational spectra proved that the nature of l-alanine interactions with both aluminas is the same (hydrogen bonding), although the groups involved depend on the l-alanine form and on alumina surface groups, both controlled by the pH. For samples prepared at pH 1, cationic l-alanine [CH3CH(NH3+)COOH] displaces physisorbed water from alumina, and strong hydrogen bonds are established between the carbonyl groups of alanine, as electron donors, and the surface Al−OH2+ groups of alumina. This occurs at the expense of alanine dimer dissociation and breaking of intramolecular bonds. When samples are prepared at pH 6, the interacting groups are Al−OH2+ and the carboxylate groups of zwitterionic l-alanine [CH3CH(NH3+)COO-]. The affinity of l-alanine toward alumina decreases, as the strong NH3+···-OOC intermolecular hydrogen bonds prevail over the interactions with alumina. Thus, for a load of 0.8 mmol g-1, phase segregation is observed. On α-alumina, crystal deposition is even observed for a load of 0.4 mmol g-1. At pH 13, the carboxylate groups of anionic l-alanine [CH3CH(NH2)COO-] are not affected by alumina. Instead, hydrogen bond interactions occur between NH2 and the Al−OH surface groups of the substrate. Complementary N2 adsorption−desorption isotherms showed that adsorption of l-alanine occurs onto the alumina pore network for samples prepared at pH 1 and 13, whereas at pH 6 the amino acid/alumina interactions are not strong enough to promote adsorption. The mesoporous structure and the high specific surface area of γ-alumina make it a more efficient substrate for adsorption of l-alanine. For each alumina, however, it is the nature of the specific interactions and not the porosity of the substrate that determines the adsorption process." @default.
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• W2023144212 date "2007-08-22" @default.
• W2023144212 modified "2023-09-27" @default.
• W2023144212 title "Interactions of <scp>l</scp>-Alanine with Alumina as Studied by Vibrational Spectroscopy" @default.
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• W2023144212 doi "https://doi.org/10.1021/la701467y" @default.
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