Bulk Nanostructure of Mixtures of Choline Arginate, Choline Lysinate, and Water.
J Phys Chem B
; 128(19): 4853-4863, 2024 May 16.
Article
in En
| MEDLINE
| ID: mdl-38691762
ABSTRACT
Neutron diffraction with empirical potential structure refinement was used to investigate the bulk liquid nanostructure of mixtures of choline arginate (Ch[Arg]), choline lysinate (Ch[Lys]), and water at mole ratios of 1Ch[Arg]1Ch[Lys]6H2O (balanced), 1Ch[Arg]1Ch[Lys]20H2O (balanced dilute), 3Ch[Arg]1Ch[Lys]12H2O (Arg- rich), and 1Ch[Arg]3Ch[Lys]12H2O (Lys- rich). The Arg- and Lys- anions tend not to associate due to electrostatic repulsion between charge groups and weak anion-anion attractions. This means that the local ion structures around the anions in these mixtures resemble the parent single-component systems. The bulk liquid nanostructure varies with the Arg-Lys- ratio. In the Lys--rich mixture (1Ch[Arg]3Ch[Lys]12H2O), Lys- side chains cluster into a continuous apolar domain separated from a charged domain of polar groups. In the balanced mixture (1Ch[Arg]1Ch[Lys]6H2O), Lys- side chains form discrete apolar aggregates within a continuous polar domain of Arg-, Ch+, and water, and in the Arg--rich mixture (3Ch[Arg]1Ch[Lys]12H2O), the distribution of Lys- and Arg- is nearly homogeneous. Finally, in the balance dilute system (1Ch[Arg]1Ch[Lys]20H2O), a percolating water domain forms.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
J Phys Chem B
/
J. phys. chem. B
/
The journal of physical chemistry. B (1997 : Online)
Journal subject:
QUIMICA
Year:
2024
Type:
Article
Affiliation country:
Australia