abstract
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.
keywords
SOLUTE-SOLVENT INTERACTIONS; DL-NOR-VALINE; AQUEOUS SODIUM-SULFATE; SOLVATION THERMODYNAMICS; CRYSTAL STRUCTURE; ALPHA-GLYCINE; L-ISOLEUCINE; L-SERINE; ALANINE; NACL
subject category
Engineering
authors
Aliyeva, M; Brandao, P; Gomes, JRB; Coutinho, JAP; Ferreira, O; Pinho, SP
our authors
José R. B. Gomes
Principal Researcher
Paula Cristina Ferreira da Silva Brandão
Assistant Researcher
Simão Pedro de Almeida Pinho
CollaboratorGroups
G1 - Porous Materials and Nanosystems
G4 - Renewable Materials and Circular Economy
G6 - Virtual Materials and Artificial Intelligence
acknowledgements
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).