Silvério Fabiano, Dos Reis Márcio José, Tronto Jairo, Valim João Barros
Departamento de Química - Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av. Bandeirantes, 3900, CEP 14040-901 Ribeirão Preto, Brazil.
Springerplus. 2013 May 8;2(1):211. doi: 10.1186/2193-1801-2-211. Print 2013 Dec.
Sorption of aspartic and glutamic aminoacids by regeneration of calcined hydrotalcite is reported. Hydrotalcite was synthesized by coprecipitation and calcined at 773 K. Sorption experiments were performed at 298 K and 310 K, and the results reveal that at low aminoacids equilibrium concentrations, intercalation of hydroxyl anions takes place while at high equilibrium concentrations, the sorption process occur by means re-hydration and aminoacids intercalation of hydrotalcite. The results also suggested that Asp and Glu sorption is a temperature dependent process. The amount of sorbed amino acid decreases as the temperature increase. The effect is more pronounced for Glu sorption probably due to its higher hydrophobic character, which makes the sorption more difficult in comparison with sorption of Asp at higher temperature.
报道了通过煅烧水滑石再生吸附天冬氨酸和谷氨酸。水滑石通过共沉淀法合成并在773 K下煅烧。吸附实验在298 K和310 K下进行，结果表明，在低氨基酸平衡浓度下，发生羟基阴离子插层，而在高平衡浓度下，吸附过程通过水滑石的再水化和氨基酸插层发生。结果还表明，天冬氨酸和谷氨酸的吸附是一个温度依赖性过程。随着温度升高，吸附的氨基酸量减少。对于谷氨酸的吸附，这种影响更为明显，这可能是由于其较高的疏水性，使得与天冬氨酸在较高温度下的吸附相比，谷氨酸的吸附更加困难。
