resumo
The solubilities of glycine,L-leucine,L-phenyl-alanine, andL-aspartic acid in aqueous solutions of the saltscomposed by combining Na+,K+, and NH4+cations and Cl-andNO3-anions were measured up to 2.0 salt molality at 298.2 K bythe analytical gravimetric method. Using these data along with areview of literature information, encompassing all amino acids forwhich solubility is available in the studied aqueous electrolytesolutions, allowed us to interpret the effect of the functional groupsof amino acids on their solubility. The four amino acids studiedhere showed higher solubility in aqueous solutions of salts with thenitrate anion. Except forL-aspartic acid with a polar side chain,amino acids with apolar side chains presented the highest salting-ineffect in aqueous salt solutions with NH4+. The cations Na+and K+did not seem to establish relevant interactions with the amino acids and had little impact on their aqueous solubility.
palavras-chave
SOLUTE-SOLVENT INTERACTIONS; DL-NOR-VALINE; AQUEOUS SODIUM-SULFATE; SOLVATION THERMODYNAMICS; CRYSTAL STRUCTURE; ALPHA-GLYCINE; L-ISOLEUCINE; L-SERINE; ALANINE; NACL
categoria
Engineering
autores
Aliyeva, M; Brandao, P; Gomes, JRB; Coutinho, JAP; Ferreira, O; Pinho, SP
nossos autores
José R. B. Gomes
Investigador Principal
Paula Cristina Ferreira da Silva Brandão
Investigador Auxiliar
Simão Pedro de Almeida Pinho
ColaboradorGrupos
G1 - Materiais Porosos e Nanossistemas
G4 - Materiais Renováveis e Economia Circular
G6 - Materiais Virtuais e Inteligência Artificial
agradecimentos
This work was developed within the scope of the project CIMO-Mountain Research Center, UIDB/00690/2020 and CICECO-Aveiro Institute of Materials, UIDB/50011/2020 and UIDP/50011/2020, financed by national funds through the Portuguese Foundation for Science and Technology (FCT)/MCTES. Mehriban Aliyeva thanks FCT and European Social Fund (ESF) for her Ph.D. grant (SFRH/BD/139355/2018).